Wearable electronic device comprising acoustic filter

Abstract

This wearable electronic device comprises: a speaker disposed in an inner space of a housing forming the exterior thereof; a first microphone which is adjacent to a first opening of the housing, and which is spaced apart from the speaker and receives external sound for active noise control; a second microphone which is adjacent to an output conduit through which a sound output from the speaker of the housing is output, and which acquires sound output from the speaker; and at least one processor which receives analog signals input from the first microphone and the second microphone so as to convert same into digital signals, and which outputs, with respect to the speaker, sound of a second frequency for offsetting sound of a first frequency at the first microphone, wherein an acoustic filter for blocking ultrasonic waves flowing into the first microphone through the first opening can be disposed between the first opening and the first microphone.

Description

Wearable electronic device including an acoustic filter

[0001] The present disclosure relates to a wearable electronic device comprising an acoustic filter for blocking ultrasonic waves.

[0002] Thanks to the development of electronic technology, various types of wearable electronic devices are becoming smaller and equipped with various functions.

[0003] At least one component related to acoustic effects may be placed in the wearable electronic device. The component related to acoustic effects may include, for example, a speaker and a microphone, and these components may be placed inside the housing of the wearable electronic device, having various shapes and arrangement structures corresponding to the various external designs of the wearable electronic device.

[0004] A wearable electronic device including a speaker and a microphone may be, for example, an in-ear earphone (or earset, headphones, headset) or a hearing aid. The wearable electronic device may be worn in a place close to the user's ear and may be manufactured in a compact size for this purpose.

[0005] The information described above may be provided as related art for the purpose of aiding understanding of the present disclosure. No claim or determination is made as to whether any of the foregoing may be applied as prior art in relation to the present disclosure.

[0006] According to one embodiment of the present disclosure, a wearable electronic device is provided.

[0007] A wearable electronic device may include: a housing that forms the exterior of the wearable electronic device and includes at least one component inside; a speaker disposed within the housing and configured to output sound through an acoustic output channel formed on one side of the housing; a first microphone disposed in the housing and configured to receive external sound for active noise control through a first opening formed at a first position exposed to the outside when the wearable electronic device is worn on a user's body; and a second microphone disposed in the acoustic output channel and configured to receive sound output from the speaker. The at least one component may include at least one processor configured to enable the wearable electronic device to perform active noise control using the first microphone, the second microphone, and the speaker. By including an acoustic filter formed between the first opening and the first microphone, the at least one processor may be configured to perform active noise control using the first microphone, the second microphone, and the speaker even in an environment where ultrasound is applied.

[0008] A wearable electronic device may include: a housing forming the exterior of the wearable electronic device; a speaker disposed in the internal space of the housing; a first microphone disposed adjacent to a first opening of the housing and formed to receive external sound for active noise control; a second microphone disposed adjacent to an output conduit through which sound output from the speaker of the housing is output and for acquiring sound output from the speaker; and at least one processor configured to receive analog signals input from the first microphone and the second microphone, convert them into digital signals, and output a sound of a second frequency to cancel out a sound of a first frequency from the first microphone with respect to the speaker. An acoustic filter for blocking ultrasonic waves entering the first microphone through the first opening may be disposed between the first opening and the first microphone.

[0009] A wearable electronic device may include: a housing forming the exterior of the wearable electronic device; a speaker disposed in the internal space of the housing; a first microphone disposed adjacent to a first opening of the housing and formed to receive external sound for active noise control; a second microphone disposed adjacent to an output conduit through which sound output from the speaker of the housing is output and formed to acquire sound output from the speaker; a third microphone disposed adjacent to a second opening of the housing and formed to receive user voice; and at least one processor configured to receive analog signals input from the first microphone and the second microphone, convert them into digital signals, and output a sound of a second frequency to cancel out a sound of a first frequency from the first microphone with respect to the speaker. A wearable electronic device may include a Helmholtz resonator formed to have a predetermined length, a predetermined width, and a predetermined volume in an acoustic input channel formed between the first opening and the first microphone, as an acoustic filter for blocking ultrasonic waves entering the first microphone through the first opening.

[0010] The aspects, configurations, and / or advantages described above regarding one embodiment of the present disclosure may become more apparent from the following detailed description with reference to the accompanying drawings.

[0011] FIG. 1 is a block diagram showing an electronic device in a network environment according to one embodiment of the present disclosure.

[0012] FIG. 2 is a block diagram of an audio module according to one embodiment of the present disclosure illustrated in FIG. 1.

[0013] FIG. 3a is a perspective view of a wearable electronic device according to one embodiment of the present disclosure.

[0014] FIG. 3b is a perspective view of a wearable electronic device according to one embodiment of the present disclosure.

[0015] FIG. 4 is a drawing illustrating a user wearing a wearable electronic device according to one embodiment of the present disclosure.

[0016] FIG. 5 is a diagram illustrating the principle of implementing an active noise control function of a wearable electronic device worn by a user in an ultrasonic environment, according to one embodiment of the present disclosure.

[0017] FIG. 6 is a part of a cross-sectional view of a wearable electronic device according to one embodiment of the present disclosure.

[0018] FIG. 7 is a part of a cross-sectional view of a wearable electronic device according to one embodiment of the present disclosure.

[0019] FIG. 8 is a perspective view of a wearable electronic device according to one embodiment of the present disclosure.

[0020] FIG. 9 is a perspective view of a wearable electronic device according to one embodiment of the present disclosure.

[0021] FIG. 10 is a cross-sectional view of one side of a wearable electronic device according to one embodiment of the present disclosure.

[0022] FIG. 11 is a diagram illustrating the operating principle of an acoustic filter that blocks ultrasound according to one embodiment of the present disclosure.

[0023] FIG. 12 is a graph showing the magnitude of amplitude for various frequency values ​​in a case where a wearable electronic device according to one embodiment of the present disclosure is equipped with an acoustic filter that blocks ultrasound and a case where it is not equipped with an acoustic filter that blocks ultrasound.

[0024] FIG. 13 is a diagram illustrating the operating principle of an acoustic filter that blocks ultrasound according to one embodiment of the present disclosure.

[0025] FIG. 14 is a drawing showing an acoustic filter according to one embodiment of the present disclosure.

[0026] FIG. 15 is a drawing showing an acoustic filter according to one embodiment of the present disclosure.

[0027] FIG. 16 is a drawing showing an acoustic filter according to one embodiment of the present disclosure.

[0028] Throughout the attached drawings, similar parts, configurations, and / or structures may be assigned similar reference numbers.

[0029] Electrical analog, digital filters, or mechanical resonators may be used to filter acoustic signals in specific frequency bands. For wearable electronic devices that receive external sound, such as earphones, filtering signals in specific acoustic frequency bands can be very important.

[0030] For example, active noise cancellation (ANC) is a function that eliminates noise by additionally applying a sound of a frequency designed to target specific frequencies that act as noise, in order to control those frequencies. As another example, if active noise cancellation technology is applied to a wearable electronic device such as earphones, ambient noise can be input through a microphone attached separately to the outside of the wearable electronic device, and then the noise can be blocked by outputting a sound that cancels out that noise through a speaker inside the wearable electronic device. Since sound is a wave, when a sound that causes noise mixes with a sound that interferes with the sound that causes noise, they cancel each other out, and the noise wave can disappear.

[0031] Active Noise Control (ANC) technology is effective in blocking external noise from wearable electronic devices and can provide hearing protection, and through this function, it can have the advantage of providing clear sound to the user even at low volume.

[0032] However, even if such active noise control technology is applied, it may not guarantee complete noise blocking. For example, even if active noise control (ANC) technology is applied to wearable electronic devices such as earphones, if ultrasound is introduced into an acoustic receiver (e.g., a microphone) that receives external noise, the performance of active noise control (ANC) may be significantly degraded.

[0033] In the present disclosure, we aim to provide a wearable electronic device comprising an acoustic filter for blocking ultrasound so that active noise control functions can operate smoothly even in an environment where ultrasound is introduced.

[0034] The following description relating to the attached drawings may provide an understanding of various exemplary embodiments of the present disclosure, including the claims and their corresponding contents. While the exemplary embodiments disclosed in the following description include various specific details to aid understanding, they are to be considered as one of various exemplary embodiments. Accordingly, those skilled in the art will understand that various changes and modifications to the various embodiments described in the present disclosure may be made without departing from the scope and technical spirit of the disclosure. Additionally, for clarity and brevity, descriptions of well-known functions and configurations may be omitted.

[0035] The terms and words used in the following description and claims are not limited to their literal meanings but may be used to clearly and consistently describe an embodiment of the present disclosure. Accordingly, it will be apparent to a person skilled in the art that the following description of various embodiments of the disclosure is provided for illustrative purposes, not for the purpose of limiting the scope of the rights or the disclosure defined as equivalent thereto.

[0036] Unless the context clearly indicates otherwise, it should be understood that the singular forms of "a," "an," and "the" include a plural meaning. Thus, for example, "component surface" can be understood to include one or more of the component surfaces.

[0037] FIG. 1 is a block diagram of an electronic device in a network environment according to various embodiments.

[0038] Referring to FIG. 1, in a network environment (100), an electronic device (101) may communicate with an electronic device (102) through a first network (198) (e.g., a short-range wireless communication network) or with at least one of an electronic device (104) or a server (108) through a second network (199) (e.g., a long-range wireless communication network). According to one embodiment, the electronic device (101) may communicate with the electronic device (104) through a server (108). According to one embodiment, the electronic device (101) may include a processor (120), memory (130), input module (150), sound output module (155), display module (160), audio module (170), sensor module (176), interface (177), connection terminal (178), haptic module (179), camera module (180), power management module (188), battery (189), communication module (190), subscriber identification module (196), or antenna module (197). In some embodiments, at least one of these components (e.g., connection terminal (178)) may be omitted from the electronic device (101), or one or more other components may be added. In some embodiments, some of these components (e.g., sensor module (176), camera module (180), or antenna module (197)) may be integrated into a single component (e.g., display module (160)).

[0039] The processor (120) can control at least one other component (e.g., hardware or software component) of the electronic device (101) connected to the processor (120) by executing software (e.g., program (140)), and can perform various data processing or operations. According to one embodiment, as at least part of the data processing or operations, the processor (120) can store commands or data received from other components (e.g., sensor module (176) or communication module (190)) in volatile memory (132), process the commands or data stored in volatile memory (132), and store the resulting data in non-volatile memory (134). According to one embodiment, the processor (120) may include a main processor (121) (e.g., central processing unit or application processor) or an auxiliary processor (123) that can operate independently or together with it (e.g., graphics processing unit, neural processing unit (NPU), image signal processor, sensor hub processor, or communication processor). For example, if the electronic device (101) includes a main processor (121) and an auxiliary processor (123), the auxiliary processor (123) may be configured to use less power than the main processor (121) or to be specialized for a designated function. The auxiliary processor (123) may be implemented separately from the main processor (121) or as part thereof.

[0040] The auxiliary processor (123) may control at least some of the functions or states associated with at least one component of the electronic device (101) (e.g., display module (160), sensor module (176), or communication module (190)) on behalf of the main processor (121) while the main processor (121) is in an inactive (e.g., sleep) state, or together with the main processor (121) while the main processor (121) is in an active (e.g., application execution) state. According to one embodiment, the auxiliary processor (123) (e.g., image signal processor or communication processor) may be implemented as part of another functionally related component (e.g., camera module (180) or communication module (190)). According to one embodiment, the auxiliary processor (123) (e.g., neural network processing unit) may include a hardware structure specialized for processing an artificial intelligence model. The artificial intelligence model may be generated through machine learning. Such learning may be performed, for example, on the electronic device (101) itself where the artificial intelligence model is executed, or through a separate server (e.g., server (108)). The learning algorithm may include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but is not limited to the examples described above. The artificial intelligence model may include a plurality of artificial neural network layers.An artificial neural network may be a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), a deep Q-network, or a combination of two or more of the above, but is not limited to the examples described above. In addition to the hardware structure, the artificial intelligence model may include a software structure, either additionally or substantially.

[0041] The memory (130) can store various data used by at least one component of the electronic device (101) (e.g., processor (120) or sensor module (176)). The data may include, for example, input data or output data for software (e.g., program (140)) and related commands. The memory (130) may include volatile memory (132) or non-volatile memory (134).

[0042] The program (140) may be stored as software in memory (130) and may include, for example, an operating system (142), middleware (144), or an application (146).

[0043] The input module (150) can receive commands or data to be used for a component of the electronic device (101) (e.g., processor (120)) from outside the electronic device (101) (e.g., user). The input module (150) may include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0044] The sound output module (155) can output a sound signal to the outside of the electronic device (101). The sound output module (155) may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as multimedia playback or recording playback. The receiver may be used to receive incoming calls. According to one embodiment, the receiver may be implemented separately from the speaker or as part thereof.

[0045] The display module (160) can visually provide information to an external (e.g., user) of the electronic device (101). The display module (160) may include, for example, a display, a holographic device, or a projector and a control circuit for controlling said device. According to one embodiment, the display module (160) may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of the force generated by said touch.

[0046] The audio module (170) can convert sound into an electrical signal or, conversely, convert an electrical signal into sound. According to one embodiment, the audio module (170) can acquire sound through the input module (150) or output sound through the sound output module (155) or an external electronic device (e.g., electronic device (102)) (e.g., speaker or headphones) connected directly or wirelessly to the electronic device (101).

[0047] The sensor module (176) can detect the operating state of the electronic device (101) (e.g., power or temperature) or the external environmental state (e.g., user state) and generate an electrical signal or data value corresponding to the detected state. According to one embodiment, the sensor module (176) may include, for example, a gesture sensor, a gyroscope sensor, a barometric pressure sensor, a magnetic sensor, an accelerometer sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biosensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0048] The interface (177) may support one or more specified protocols that can be used for the electronic device (101) to be connected directly or wirelessly to an external electronic device (e.g., electronic device (102)). According to one embodiment, the interface (177) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

[0049] The connection terminal (178) may include a connector through which the electronic device (101) can be physically connected to an external electronic device (e.g., electronic device (102)). According to one embodiment, the connection terminal (178) may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0050] The haptic module (179) can convert an electrical signal into a mechanical stimulus (e.g., vibration or movement) or an electrical stimulus that the user can perceive through tactile or kinesthetic senses. According to one embodiment, the haptic module (179) may include, for example, a motor, a piezoelectric element, or an electric stimulation device.

[0051] The camera module (180) can capture still images and video. According to one embodiment, the camera module (180) may include one or more lenses, image sensors, image signal processors, or flashes.

[0052] The power management module (188) can manage the power supplied to the electronic device (101). According to one embodiment, the power management module (188) can be implemented, for example, as at least part of a power management integrated circuit (PMIC).

[0053] The battery (189) can supply power to at least one component of the electronic device (101). According to one embodiment, the battery (189) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0054] The communication module (190) can support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between an electronic device (101) and an external electronic device (e.g., electronic device (102), electronic device (104), or server (108)), and the performance of communication through the established communication channel. The communication module (190) may include one or more communication processors that operate independently of the processor (120) (e.g., application processor) and support direct (e.g., wired) communication or wireless communication. According to one embodiment, the communication module (190) may include a wireless communication module (192) (e.g., cellular communication module, short-range wireless communication module, or GNSS (global navigation satellite system) communication module) or a wired communication module (194) (e.g., LAN (local area network) communication module, or power line communication module). The corresponding communication module among these communication modules can communicate with an external electronic device (104) through a first network (198) (e.g., a short-range communication network such as Bluetooth, WiFi (wireless fidelity) direct, or IrDA (infrared data association)) or a second network (199) (e.g., a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules may be integrated into a single component (e.g., a single chip) or implemented as multiple separate components (e.g., multiple chips). The wireless communication module (192) can identify or authenticate the electronic device (101) within a communication network such as the first network (198) or the second network (199) using subscriber information (e.g., International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module (196).

[0055] The wireless communication module (192) can support 5G networks and next-generation communication technologies following 4G networks, for example, new radio access technology. NR access technology can support high-speed transmission of high-capacity data (enhanced mobile broadband (eMBB)), minimization of terminal power and connection of multiple terminals (massive machine type communications (mMTC)), or high reliability and low latency (ultra-reliable and low-latency communications (URLLC)). The wireless communication module (192) can support a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate, for example. The wireless communication module (192) can support various technologies for securing performance in the high-frequency band, such as beamforming, massive MIMO (multiple-input and multiple-output), full-dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large-scale antenna. The wireless communication module (192) can support various requirements specified in the electronic device (101), external electronic device (e.g., electronic device (104)), or network system (e.g., second network (199)). According to one embodiment, the wireless communication module (192) can support a Peak data rate (e.g., 20 Gbps or more) for realizing eMBB, loss coverage (e.g., 164 dB or less) for realizing mMTC, or U-plane latency (e.g., downlink (DL) and uplink (UL) each 0.5 ms or less, or round trip 1 ms or less) for realizing URLLC.

[0056] An antenna module (197) can transmit a signal or power to or from an external source (e.g., an external electronic device). According to one embodiment, the antenna module (197) may include an antenna comprising a radiator made of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). According to one embodiment, the antenna module (197) may include a plurality of antennas (e.g., an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network, such as a first network (198) or a second network (199), may be selected from the plurality of antennas, for example, by a communication module (190). A signal or power may be transmitted or received between the communication module (190) and an external electronic device through the selected at least one antenna. According to some embodiments, in addition to the radiator, other components (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as part of the antenna module (197).

[0057] According to various embodiments, the antenna module (197) may form a mmWave antenna module. According to one embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent to a first surface (e.g., bottom surface) of the printed circuit board and capable of supporting a specified high frequency band (e.g., mmWave band), and a plurality of antennas (e.g., array antennas) disposed on or adjacent to a second surface (e.g., top surface or side surface) of the printed circuit board and capable of transmitting or receiving a signal of the specified high frequency band.

[0058] At least some of the above components can be connected to each other via a communication method between peripheral devices (e.g., bus, GPIO (general purpose input and output), SPI (serial peripheral interface), or MIPI (mobile industry processor interface)) and exchange signals (e.g., commands or data) with each other.

[0059] According to one embodiment, commands or data may be transmitted or received between the electronic device (101) and an external electronic device (104) through a server (108) connected to a second network (199). Each of the external electronic devices (102, or 104) may be the same or different type of device as the electronic device (101). According to one embodiment, all or part of the operations performed on the electronic device (101) may be performed on one or more of the external electronic devices (102, 104, or 108). For example, if the electronic device (101) needs to perform a function or service automatically or in response to a request from a user or another device, the electronic device (101) may request one or more external electronic devices to perform at least part of the function or service instead of performing the function or service itself or additionally. One or more external electronic devices that receive the above request may execute at least part of the requested function or service, or additional function or service related to the request, and transmit the result of the execution to the electronic device (101). The electronic device (101) may provide the result as is or additionally processed as at least part of the response to the request. For this purpose, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used. The electronic device (101) may provide ultra-low latency services using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device (104) may include an Internet of Things (IoT) device. The server (108) may be an intelligent server using machine learning and / or neural networks. According to one embodiment, the external electronic device (104) or the server (108) may be included within a second network (199).The electronic device (101) can be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology and IoT-related technology.

[0060] FIG. 2 is a block diagram of an audio module (170) according to an embodiment of the present disclosure illustrated in FIG. 1. Referring to FIG. 2, the audio module (170) may include, for example, an audio input interface (210), an audio input mixer (220), an analog to digital converter (ADC) (230), an audio signal processor (240), a digital to analog converter (DAC) (250), an audio output mixer (260), or an audio output interface (270).

[0061] According to one embodiment of the present disclosure, the audio input interface (210) may receive an audio signal corresponding to sound obtained from outside the electronic device (101) through a microphone (e.g., dynamic microphone, condenser microphone, or piezo microphone) configured separately from the electronic device (101) or as part of the input module (150). For example, if the audio signal is obtained from an external electronic device (102) (e.g., headset or microphone), the audio input interface (210) may receive the audio signal by being connected directly to the external electronic device (102) through a connection terminal (178) or wirelessly (e.g., Bluetooth communication) through a wireless communication module (192). According to one embodiment, the audio input interface (210) may receive a control signal (e.g., a volume adjustment signal received via an input button) related to the audio signal obtained from the external electronic device (102). The audio input interface (210) includes a plurality of audio input channels and can receive different audio signals for each corresponding audio input channel among the plurality of audio input channels. According to one embodiment, additionally or substantially, the audio input interface (210) can receive audio signals from other components of the electronic device (101) (e.g., processor (120) or memory (130)).

[0062] According to one embodiment of the present disclosure, the audio input mixer (220) can synthesize a plurality of input audio signals into at least one audio signal. For example, according to one embodiment, the audio input mixer (220) can synthesize a plurality of analog audio signals input through the audio input interface (210) into at least one analog audio signal.

[0063] According to one embodiment of the present disclosure, the ADC (230) can convert an analog audio signal into a digital audio signal. For example, according to one embodiment, the ADC (230) can convert an analog audio signal received through an audio input interface (210), or an analog audio signal synthesized through an audio input mixer (220) additionally or substantially, into a digital audio signal.

[0064] According to one embodiment of the present disclosure, an audio signal processor (240) may perform various processing on a digital audio signal received through an ADC (230) or a digital audio signal received from another component of an electronic device (101). For example, according to one embodiment, the audio signal processor (240) may perform a sampling rate change, apply one or more filters, perform interpolation processing, amplify or attenuate all or part of the frequency band, noise processing (e.g., noise or echo attenuation), channel change (e.g., switching between mono and stereo), mixing, or extract a specified signal on one or more digital audio signals. According to one embodiment, one or more functions of the audio signal processor (240) may be implemented in the form of an equalizer.

[0065] According to one embodiment of the present disclosure, the DAC (250) can convert a digital audio signal into an analog audio signal. For example, according to one embodiment, the DAC (250) can convert a digital audio signal processed by an audio signal processor (240) or a digital audio signal obtained from another component of the electronic device (101) (e.g., a processor (120) or a memory (130)) into an analog audio signal.

[0066] According to one embodiment of the present disclosure, the audio output mixer (260) can synthesize a plurality of audio signals to be output into at least one audio signal. For example, according to one embodiment, the audio output mixer (260) can synthesize an audio signal converted to analog through a DAC (250) and another analog audio signal (e.g., an analog audio signal received through an audio input interface (210)) into at least one analog audio signal.

[0067] According to one embodiment of the present disclosure, an audio output interface (270) may output an analog audio signal converted through a DAC (250), or an analog audio signal additionally or substantially synthesized by an audio output mixer (260), to the outside of an electronic device (101) through an audio output module (155). The audio output module (155) may include, for example, a speaker or receiver such as a dynamic driver or a balanced armature driver. According to one embodiment, the audio output module (155) may include a plurality of speakers. In this case, the audio output interface (270) may output an audio signal having different plurality of channels (e.g., stereo, or 5.1 channels) through at least some of the plurality of speakers. According to one embodiment, the audio output interface (270) can output an audio signal by being connected directly to an external electronic device (102) (e.g., an external speaker or headset) through a connection terminal (178) or wirelessly through a wireless communication module (192).

[0068] According to one embodiment of the present disclosure, the audio module (170) may generate at least one digital audio signal by synthesizing a plurality of digital audio signals using at least one function of an audio signal processor (240), without separately having an audio input mixer (220) or an audio output mixer (260).

[0069] According to one embodiment of the present disclosure, the audio module (170) may include an audio amplifier (not shown) (e.g., a speaker amplifier circuit) capable of amplifying an analog audio signal input through an audio input interface (210) or an audio signal to be output through an audio output interface (270). According to one embodiment, the audio amplifier may be configured as a separate module from the audio module (170).

[0070] The details regarding the electronic device (101) described above with reference to FIG. 1 and the details regarding the audio module (170) described with reference to FIG. 2 may be substantially applied to the wearable electronic device (300; 400) described with reference to FIG. 3a to FIG. 16, provided that they are not mutually opposed. Hereinafter, a wearable electronic device (300; 400) according to an embodiment of the present disclosure will be described with reference to FIG. 3a to FIG. 16.

[0071] FIG. 3a is a perspective view of a wearable electronic device according to one embodiment of the present disclosure. FIG. 3b is a perspective view of a wearable electronic device according to one embodiment of the present disclosure. FIG. 4 is a drawing illustrating a user wearing a wearable electronic device according to one embodiment of the present disclosure.

[0072] The components described with reference to FIGS. 3a and 4 may be, in part or in whole, identical to the components described with reference to FIGS. 1 and 2. The components described with reference to FIGS. 3a and 4 may be, in part or in whole, identical to the components described with reference to FIGS. 5 and 16.

[0073] In the embodiment of FIG. 3b, an orthogonal coordinate system is illustrated for convenience of explanation. The line B-B' in FIG. 3b may be parallel to the X-axis of the orthogonal coordinate system. The line A-A' in FIG. 3b is illustrated to be oriented in a direction inclined with respect to the X-axis and Y-axis of the orthogonal coordinate system. The port (320) in FIG. 3a is illustrated as being parallel to the Z-axis of the orthogonal coordinate system. However, it should be noted that the external and internal shapes of the housing (410) of the wearable electronic device (300) of the present disclosure, and the positions of the parts placed inside the housing (410), may vary depending on the embodiment.

[0074] The wearable electronic device (300) may be connected to an electronic device (e.g., 102 in FIG. 1) via wired or wireless connection. In this case, the wearable electronic device (300) may function as an audio output interface (or audio output module (e.g., 155 in FIG. 1)) that outputs an acoustic signal generated by the electronic device (e.g., 102 in FIG. 1) to the outside in relation to the electronic device (e.g., 102 in FIG. 1). Additionally or generally, the wearable electronic device (300) disclosed in this document may also function as an audio input interface (or input module (e.g., 150 in FIG. 1)) for receiving an audio signal corresponding to a sound obtained from outside the electronic device (e.g., 102 in FIG. 1). Hereinafter, the wearable electronic device (300) may be described as being provided separately from the electronic device (e.g., 102 in FIG. 1) as one example. Accordingly, in the following embodiments, the electronic device (e.g., 102 in FIG. 1) may be referred to as an ‘external electronic device (e.g., 102 in FIG. 1)’ in the sense that it can be provided separately from the wearable electronic device (300).

[0075] The wearable electronic device (300) of the present disclosure is configured to include an acoustic receiver (e.g., microphone) (hereinafter referred to as "microphone"), and for example, the wearable electronic device (300) may include an earphone, earset, in-ear earset or earbuds, headphones, or headset that can be worn on a user's ear (E), but is not necessarily limited thereto. The wearable electronic device (300) of the present disclosure may be briefly referred to as an "electronic device" or a "wearable device."

[0076] According to one embodiment, the wearable electronic device (300) may include a housing (310). The housing (310) may form the outer shape of the wearable electronic device (300). The housing (310) may be mounted on the user's ear. When the housing (310) is mounted on the user's ear, one part of the housing (310) may be covered by being surrounded by the ear, and another part of the housing (310) may be exposed to the outside. For example, at least a part of the housing (310) may have a curved surface. The housing (310) may form a space for mounting various components inside. For example, acoustic components and electronic components may be placed inside the housing (310). The acoustic components may include, for example, an input module (150 in FIG. 1) (e.g., a microphone) and an acoustic output module (155 in FIG. 1) (e.g., a speaker). The above electronic components may include, for example, a battery, a power management module, and a wireless communication module. According to one embodiment, the housing (310) may be referred to as "casing (310)".

[0077] According to one embodiment, the housing (310) may include a first housing (311). The housing (310) may include a second housing (312). For example, the first housing (311) and the second housing (312) may be integral. For example, an antenna (e.g., antenna (360) of FIG. 6), a first substrate (e.g., first substrate (370) of FIG. 6), a battery (e.g., battery (380) of FIG. 6), and / or a microphone (e.g., microphone (340, 350, 390) of FIG. 6 or FIG. 7) may be disposed inside the first housing (311). For example, a speaker (e.g., speaker (380) of FIG. 6) may be disposed inside the second housing (312).

[0078] According to one embodiment, the wearable electronic device (300) may include a port (320). For example, the port (320) may protrude outward from the housing (310). For example, the port (320) may be formed integrally with the second housing (312). For example, the port (320) may be coupled to the second housing (312). Sound output from a speaker (e.g., speaker (380) of FIG. 6) may be transmitted outside the housing (310) through the port (320).

[0079] According to one embodiment, the housing (310) may include openings (313, 314). The openings (313, 314) may be formed by opening on the surface of the housing (310). The openings (313, 314) may be formed in the first housing (311). Sound from outside the housing (310) may be transmitted into the housing (310) through the openings (313, 314).

[0080] According to one embodiment, the openings (313, 314) may be multiple. For example, the multiple openings (313, 314) may include a first opening (313) and a second opening (314). The first opening (313) and the second opening (314) may be spaced apart from each other. Each of the first opening (313) and the second opening (314) may be referred to as an "opening." According to one embodiment, when the wearable electronic device (300) is mounted on the user's ear (E), the openings (313, 314) may be exposed to the outside.

[0081] According to one embodiment, the wearable electronic device (300) may include a grill (330). The grill (330) may be placed in an area corresponding to the first opening (313). The grill (330) may be coupled to the housing (310) and may serve to primarily filter sound and / or air entering through the first opening (313). The grill (330) may filter out impurities directed toward the first opening (313). The grill (330) may also serve to prevent wind noise from entering through the first opening (313). Although FIGS. 3a to 4 show the grill (330) being placed only in the first opening (313), it is not necessarily limited thereto. According to an embodiment, the grill may also be placed in an area corresponding to the second opening (314).

[0082] FIG. 5 is a diagram illustrating the principle of implementing an active noise control function of a wearable electronic device worn by a user in an ultrasonic environment, according to one embodiment of the present disclosure.

[0083] Referring to FIG. 5, a number of traffic lights (TL; traffic light emitting apparatus) may be installed on the road. Vehicles can travel on the road, and pedestrians (or users) can walk on the road using crosswalks.

[0084] Traffic lights can emit light to guide the driving of vehicles or to guide the walking of pedestrians (or users). When a traffic light emits a signal to guide the walking of pedestrians (or users), it may also output a signal in the form of ultrasound (US) to indicate that the signal guiding walking is about to be turned off. Here, ultrasound may refer to a sound with a frequency higher than the audible frequency range that humans can hear, and may be a sound with a frequency greater than approximately 20 kHz.

[0085] For example, as illustrated in FIG. 5, if the wearable electronic device (300) in the form of an earphone has an active noise control (ANC) function, the wearable electronic device (300) may include a microphone (340) for receiving sound from outside the housing (410), a microphone (390) for receiving sound from inside the housing (410), and a speaker (380). The external sound is received through the microphone (340) for receiving the external sound, and the analog information from this sound can be converted into a digital signal by passing through a digital signal processor (DSP) (301). Then, the digital signal processor (DSP) (301) or another processor provided separately may be configured to output a sound having a frequency for canceling out the noise from the speaker (380).

[0086] In this process, the microphone (340) receiving sound from outside the housing (410) may be referred to as a "feedforward microphone" (or reference microphone), and the microphone (390) receiving sound from inside the housing (410) may be referred to as a "feedback microphone" (or error microphone). Furthermore, the microphone (340) receiving sound from outside the housing (410) and the microphone (390) receiving sound from inside the housing (410) may each play a role in receiving analog input in feedforward control and feedback control, respectively, in active noise control, as implied by their names.

[0087] However, as illustrated in FIG. 5, when the wearable electronic device (300) receives ultrasonic waves (US) as sound from outside the housing (410), saturation may occur in the microphone (340) that receives the sound from outside the housing (410), and feedforward control may not be implemented normally.

[0088] Conventionally, as illustrated in FIG. 5, in an environment where ultrasound is introduced, when a wearable electronic device (300) with an active noise control (ANC) function receives ultrasound, it was possible to immediately stop the feedforward control operation itself to prevent malfunction of the active noise control (ANC) function. However, since the feedforward control operation in the active noise control (ANC) is omitted, this method may have a problem in that the noise control performance deteriorates.

[0089] According to the present disclosure, a wearable electronic device (300) having an active noise control (ANC) function is disclosed to be able to perform feedback control as well as feedforward control normally even when the wearable electronic device (300) is in an environment where ultrasound is introduced.

[0090] For example, the environment in which the above-mentioned ultrasound is introduced is not limited to when a user is standing on a crosswalk, and may include various other forms of environments, such as a device that checks whether a user has entered or exited to determine the presence of a user in each stall of a restroom.

[0091] FIG. 6 is a part of a cross-sectional view of a wearable electronic device according to one embodiment of the present disclosure. FIG. 7 is a part of a cross-sectional view of a wearable electronic device according to one embodiment of the present disclosure. The components described with reference to FIG. 6 and FIG. 7 may be, in part or in whole, identical to the components described with reference to FIG. 1 to FIG. 5. The components described with reference to FIG. 6 and FIG. 7 may be, in part or in whole, identical to the components described with reference to FIG. 8 to FIG. 16.

[0092] FIG. 6 is a cross-sectional view of a wearable electronic device (300) along the A-A' reference line shown in FIG. 3b. FIG. 7 is a cross-sectional view of a wearable electronic device (300) along the B-B' reference line shown in FIG. 3b.

[0093] According to one embodiment, the wearable electronic device (300) may include microphones (340, 350, 390). In one embodiment, a plurality of microphones (340, 350, 390) may be arranged. For example, the microphones (340, 350, 390) may include a first microphone (340), a second microphone (390), and a third microphone (350). The first microphone (340) and the third microphone (350), the first microphone (340) and the second microphone (390), and the third microphone (350) and the second microphone (390) may be spaced apart from each other. The first microphone (340), the second microphone (390), and the third microphone (350) may each be referred to as "microphones".

[0094] According to one embodiment, the first microphone (340) and the third microphone (350) may be configured to receive sound from outside the housing (310). One of the first microphone (340) and the third microphone (350) may be configured to receive external sound to perform an active noise control (ANC) function, and the other may be configured to receive the user's voice. For example, through the microphone configured to receive the user's voice, the wearable electronic device may perform voice call functions and / or voice recording functions. According to one embodiment, the first microphone (340) and the third microphone (350) may be placed inside the housing (310). According to one embodiment, the first microphone (340) and the third microphone (350) may be placed inside the housing (310) adjacent to a surface forming the exterior of the housing (310). Here, the surface forming the exterior may include a flat surface and / or a curved surface.

[0095] The following describes in detail an embodiment in which the first microphone (340) is a microphone for active noise control (ANC) and the third microphone (350) is a microphone configured to receive the user's voice. At this time, the first microphone (340) may be referred to as a "reference microphone." Feedforward control of an active noise control (ANC) sequence (e.g., FIG. 5) can be performed through the first microphone (340).

[0096] The first microphone (340) may include a first microphone hole (341). The first microphone (341) may pick up external sound through the first microphone hole (341). The third microphone (350) may include a second microphone hole (351). The third microphone (350) may pick up external sound through the second microphone hole (351). For example, air (e.g., wind) flowing outside the housing (e.g., the housing (310) in FIG. 3a) may be introduced into the microphones (340, 350) through the microphone holes (341, 351), and the microphones (340, 350) may detect sound generated by the flow of said air.

[0097] The M region shown in FIG. 7 is an enlarged view of the area near the first microphone (340) in a cross-sectional view of a wearable electronic device (300) including a housing (310). The wearable electronic device (300) may include a chamber (316) that supports the grill (330) and / or is integrally formed with the grill (330). The housing (310) may be coupled to the grill (330). The wearable electronic device (300) may include a first opening (313) that communicates with the first microphone hole (341) of the first microphone (340). Sound from outside the housing (310) may be picked up by the first microphone (340) through the grill (330), the first opening (313), and the first microphone hole (341).

[0098] According to one embodiment, the wearable electronic device (300) may include a second opening (314) in communication with a second microphone hole (351) of a third microphone (350). Sound from outside the housing (310) can be received by the third microphone (350) through the second opening (314). If a grill is also placed in the second opening (314) corresponding to the third microphone (350), sound from outside the housing (310) can be received by the third microphone (350) through the grill, the second opening (314), and the second microphone hole (351).

[0099] The drawings and the foregoing description of the present disclosure disclose a wearable electronic device comprising a first microphone (340) and a third microphone (350) provided separately as a configuration for receiving external sound of a housing. Alternatively, a wearable electronic device according to one embodiment of the present disclosure may include a single microphone in which the first microphone (340) and the third microphone (350) are integrated to perform an active noise control (ANC) function and a user voice receiving function.

[0100] According to one embodiment, the wearable electronic device (300) may include an antenna (360). The antenna (360) may be placed inside a first housing (311). The antenna (360) may transmit and / or receive a signal in relation to an external electronic device (e.g., the electronic device (102) of FIG. 1).

[0101] According to one embodiment, the wearable electronic device (300) may include a first substrate (370). For example, the first substrate (370) may be electrically connected to microphones (340, 350), an antenna (360), a second substrate (375), a battery (385) and / or a speaker (380).

[0102] According to one embodiment, the wearable electronic device (300) may include a second substrate (375). The second substrate (375) may be electrically connected to the first substrate (370). For example, the second substrate (375) may connect the first substrate (370) to microphones (340, 350). For example, the second substrate (375) may connect the first substrate (370) to a battery (380). For example, the second substrate (375) may connect the first substrate (370) to a speaker (380). For example, the second substrate (375) may include a flexible printed circuit board. According to one embodiment, the second substrate (375) may be formed integrally with the first substrate (370), in which case the second substrate (375) may correspond to a part of the first substrate (370).

[0103] According to one embodiment, the wearable electronic device (300) may include a battery (385). For example, the battery (385) may be placed inside a housing (310). The battery (385) may supply power to microphones (340, 350, 390), a speaker (380), and other electronic components (e.g., a processor and / or a digital signal processor (DSP)).

[0104] According to one embodiment, the wearable electronic device (300) may include a speaker (380). For example, the speaker (380) may be placed inside the housing (310). The speaker (380) may output sound to the outside of the housing. The sound output from the speaker (380) may be output to the outside of the housing through a port (320). According to one embodiment, the wearable electronic device (300) may include an output conduit (321). The output conduit (321) may be formed inside the port (320). The output conduit (321) may face the speaker (380). The sound generated from the speaker (380) may be transmitted to the outside of the housing (310) through the output conduit (321).

[0105] According to one embodiment, the wearable electronic device (300) may include a second microphone (390). According to one embodiment, the second microphone (390) may be placed in an output tube (321). However, it is not necessarily limited thereto, and the position of the second microphone (390) is not limited to that shown in the drawing and can be changed to various other forms as long as it is a position capable of receiving sound output from the speaker (380). In this case, the second microphone (390) may be referred to as an "error microphone." Feedback control of an active noise control (ANC) sequence (e.g., FIG. 5) can be performed through the second microphone (390).

[0106] According to one embodiment, the wearable electronic device (300) may include an ear tip (325). The ear tip (325) may be inserted into the user's ear. For example, the ear tip (325) may be fixed to a port (320).

[0107] Although not separately indicated in FIGS. 6 and 7, the wearable electronic device (300) may include various additional electronic components in addition to the components mentioned above. According to one embodiment, the wearable electronic device (300) may further include a digital signal processor (DSP) and / or other processors. For example, the digital signal processor (DSP) may identify a signal (e.g., vibration) for sound received by the first microphone (340). The digital signal processor (DSP) may identify the signal for sound received by the first microphone (340) in the form of an analog or digital signal. Additionally, the digital signal processor (DSP) may receive a signal for sound received through the second microphone (390) and identify it in the form of an analog or digital signal. According to one embodiment, the digital signal processor (DSP) may further include a converter. The converter may convert a digital signal generated by processing in the digital signal processor into an analog signal.

[0108] A wearable electronic device (300) according to one embodiment of the present disclosure may further include an acoustic filter (345) to block ultrasound. According to one embodiment, the acoustic filter (345) may be in the form of a duct having a predetermined length. According to one embodiment, the acoustic filter (345) may be formed at a position corresponding to the first microphone (340). According to one embodiment, the acoustic filter (345) may be placed between the first microphone (340) and the first opening (313). According to one embodiment, the acoustic filter (345) may be formed on the inner wall (3131) of the input conduit between the first microphone (340) and the first opening (313).

[0109] The components and features of the acoustic filter (345) for blocking ultrasound will be described in more detail below with reference to the embodiments of FIGS. 11 to 16.

[0110] FIG. 8 is a perspective view of a wearable electronic device according to one embodiment of the present disclosure. FIG. 9 is a perspective view of a wearable electronic device according to one embodiment of the present disclosure. FIG. 10 is a cross-sectional view of one side of a wearable electronic device according to one embodiment of the present disclosure. FIG. 10 is an enlarged view of a cross-section of a wearable electronic device cut along the C-C' direction in FIG. 8.

[0111] The components described with reference to FIGS. 8 to 10 may be partially or entirely identical to the components described with reference to FIGS. 1 to 7. The components described with reference to FIGS. 8 to 10 may be partially or entirely identical to the components described with reference to FIGS. 11 to 16.

[0112] In describing the drawings including FIGS. 8 to 10 and the embodiments thereof, a Cartesian coordinate system including the X-axis, Y-axis, and Z-axis may be referenced. For example, the height direction of the wearable electronic device (300) may be understood as being parallel to the Z-axis of the Cartesian coordinate system (e.g., +Z-axis and / or -Z-axis).

[0113] The wearable electronic device (400) may be connected to an electronic device (e.g., 102 in FIG. 1) via wired or wireless connection. In this case, the wearable electronic device (300) may function as an audio output interface (or audio output module (e.g., 155 in FIG. 1)) that outputs an acoustic signal generated from the electronic device (e.g., 102 in FIG. 1) to the outside in relation to the electronic device (e.g., 102 in FIG. 1). Additionally or generally, the wearable electronic device (400) disclosed in this document may also function as an audio input interface (or input module (e.g., 150 in FIG. 1)) for receiving an audio signal corresponding to a sound obtained from outside the electronic device (e.g., 102 in FIG. 1). Hereinafter, the wearable electronic device (400) may be described as being provided separately from the electronic device (e.g., 102 in FIG. 1) as one example. Accordingly, in the following embodiments, the electronic device (e.g., 102 in FIG. 1) may be referred to as an ‘external electronic device (e.g., 102 in FIG. 1)’ in the sense that it can be provided separately from the wearable electronic device ($00).

[0114] The wearable electronic device (300) of the present disclosure is configured to include an acoustic receiver (e.g., microphone) (hereinafter referred to as "microphone"), and for example, the wearable electronic device (300) may include an earphone, earset, in-ear earset or earbuds, headphones, or headset that can be worn on a user's ear (E), but is not necessarily limited thereto. The wearable electronic device (300) of the present disclosure may be briefly referred to as an "electronic device" or a "wearable device."

[0115] According to one embodiment, the wearable electronic device (400) may include a housing (410). The housing (410) may form the outer shape of the wearable electronic device (400). The housing (410) may be mounted on the user's ear. When the housing (410) is mounted on the user's ear, one part of the housing (410) may be covered by being surrounded by the ear, and another part of the housing (410) may be exposed to the outside. For example, at least a part of the housing (410) may have a curved surface. The housing (410) may form a space for mounting various components inside. For example, acoustic components and electronic components may be placed inside the housing (410). The acoustic components may include, for example, an input module (150 in FIG. 1) (e.g., a microphone) and an acoustic output module (155 in FIG. 1) (e.g., a speaker). The above electronic components may include, for example, a battery, a power management module, and a wireless communication module. According to one embodiment, the housing (410) may be referred to as "casing (410)".

[0116] Referring to FIGS. 8 and 9, the housing (410) of a wearable electronic device (400) may include a body (411) and a stem (412). The stem (412) may be a portion extending from the body (411). An acoustic output module (155 in FIG. 1) (e.g., a speaker) may be disposed on the body (411). A first substrate (470) to which electronic components included in the wearable electronic device (400) (e.g., a speaker, a battery, and / or a microphone, etc.) are connected may be disposed on the stem (412). As an example, the body (411) may have the shape of a bean. The stem (412) may extend straight in one direction from the body (411). The body (411) and the stem (412) can be seated on the concha of the ear when the user wears the wearable electronic device (400). The housing (410) may have a shape that takes ergonomic elements into consideration. FIGS. 8 and 9 disclose an open-type housing (410) mounted on the outer ear as a wearable electronic device (400), but is not necessarily limited thereto. For example, as shown in FIGS. 3a to 7, a canal-type housing mounted on the external auditory canal extending from the outer ear to the eardrum is also applicable, as previously mentioned.

[0117] Sound output from an acoustic output module (e.g., acoustic output module (155) of FIG. 1, speaker (380) of FIG. 6) can be radiated to the outside of the wearable electronic device (400) through the internal space of the housing (410), a conduit component disposed inside the housing (410), and / or an output conduit (421). The output conduit (421) may be disposed in a part of the body (411) of the wearable electronic device (400). According to one embodiment, a grill may be disposed in the output conduit (421).

[0118] According to one embodiment, the wearable electronic device (400) may include a microphone (e.g., the microphone (340, 350, 390) of FIGS. 6 and 7). In one embodiment, a plurality of microphones (e.g., the microphone (340, 350, 390) of FIGS. 6 and 7) may be arranged. For example, the microphone (e.g., the microphone (340, 350, 390) of FIGS. 6 and 7) may include a first microphone (440) (e.g., the first microphone (340) of FIGS. 6 and 7), a second microphone (e.g., the second microphone (390) of FIGS. 6 and 7), and a third microphone (e.g., the third microphone (350) of FIGS. 6 and 7). The first microphone (440) and the second microphone, the first microphone (440) and the third microphone, and the second microphone and the third microphone may be spaced apart from each other. The first microphone (440), the second microphone and the third microphone may each be referred to as "microphone".

[0119] According to one embodiment, a first microphone (440) (e.g., the first microphone (340) of FIGS. 6 and 7) and a third microphone (e.g., the third microphone (350) of FIGS. 6 and 7) may be configured to receive sound from outside the housing (410). One of the first microphone and the third microphone may be configured to receive external sound to perform an active noise control (ANC) function, and the other may be configured to receive the user's voice. For example, through the microphone configured to receive the user's voice, the wearable electronic device may perform voice call functions and / or voice recording functions. According to one embodiment, the first microphone (440) and the third microphone may be placed inside the housing (410). According to one embodiment, the first microphone (440) and the third microphone may be placed inside the housing (410) adjacent to the surface forming the exterior of the housing (410). Here, the surface forming the exterior may include a flat surface and / or a curved surface.

[0120] The following description focuses on an embodiment in which the first microphone (440) (e.g., the first microphone (340) in FIGS. 6 and 7) is a microphone for active noise control (ANC), and the third microphone (e.g., the third microphone (350) in FIGS. 6 and 7) is a microphone configured to receive the user's voice. In this case, the first microphone (440) may be referred to as a "reference microphone." Feedforward control of an active noise control (ANC) sequence (e.g., FIG. 5) can be performed through the first microphone (440).

[0121] A first microphone (440) (e.g., the first microphone (340) in FIGS. 6 and 7) may include a first microphone hole (441) (e.g., the first microphone hole (341) in FIGS. 6 and 7). The first microphone hole (341) may be formed at a position corresponding to the first opening (313). The first microphone (440) may receive external sound through the first microphone hole (441). A third microphone (e.g., the third microphone (350) in FIGS. 6 and 7) may include a second microphone hole. The third microphone may receive external sound through the second microphone hole. For example, air (e.g., wind) flowing outside the housing (410) may be introduced into the microphones through the microphone holes, and the microphones may detect sound generated by the flow of said air.

[0122] The wearable electronic device (400) may include a first opening (413) (e.g., the first opening (313) of FIG. 6 and FIG. 7) that is in communication with the first microphone hole (441) of the first microphone (440). According to one embodiment, the wearable electronic device (400) may further include a grille. Sound from outside the housing (310) can be picked up by the first microphone (440) through the grille, the first opening (413), and the first microphone hole (441).

[0123] According to one embodiment, the wearable electronic device (400) may include a second opening (414) (e.g., the second opening (314) of FIGS. 6 and 7) in communication with a second microphone hole (e.g., the second microphone hole (351) of FIGS. 6 and 7) of a third microphone (e.g., the third microphone (350) of FIGS. 6 and 7). Sound from outside the housing (410) may be picked up by the third microphone through the second opening (414). If a grille is also placed in the second opening (414) corresponding to the third microphone, sound from outside the housing (410) may be picked up by the third microphone through the grille, the second opening (414), and the second microphone hole.

[0124] According to one embodiment, the wearable electronic device (400) may include an antenna (e.g., 360 in FIGS. 6 and 7). According to one embodiment, the wearable electronic device (300) may include a first substrate (470). For example, the first substrate (470) may be electrically connected to microphones, an antenna, a second substrate (e.g., 375 in FIGS. 6 and 7), a battery (e.g., 385 in FIGS. 6 and 7) and / or a speaker (e.g., 380 in FIGS. 6 and 7).

[0125] According to one embodiment, the first substrate (470) may include a first surface (470a) and a second surface (470b) facing in a direction opposite to the direction facing the first surface (470a). The second surface (470b) may be positioned adjacent to the housing (410) and may be positioned to face the external direction of the electronic device. In this case, the first surface (470a) may be positioned toward the internal space of the electronic device. According to one embodiment, the first substrate (470) may include a substrate hole (471). The substrate hole (471) may be formed by penetrating the first surface (470a) and the second surface (470b). According to one embodiment, a first microphone (440) may be positioned on the first surface (470a) of the substrate. According to one embodiment, the first microphone hole (441) of the first microphone (440) may be aligned with the first substrate (470) and the substrate hole (471). In some embodiments, not only the first microphone hole (441) but also the substrate hole (471) may serve to collect sound received by the first microphone (440), having substantially the same function as the first microphone hole (441).

[0126] According to one embodiment, the wearable electronic device (400) may include a speaker (e.g., 380 in FIGS. 6 and 7). For example, the speaker may be placed inside the housing (410). The speaker may output sound to the outside of the housing. The sound output from the speaker may be output to the outside of the housing through a port. According to one embodiment, the wearable electronic device (400) may include an output conduit (421). The output conduit (421) may be formed inside the port. The output conduit (421) may face the speaker. The sound generated from the speaker may be transmitted to the outside of the housing (310) through the output conduit (421).

[0127] According to one embodiment, the wearable electronic device (400) may include a second microphone (e.g., second microphone (390) in FIG. 6). According to one embodiment, the second microphone may be placed in an output tube (421). However, it is not necessarily limited thereto, and the position of the second microphone may be changed to various other forms, not limited to what is shown in the drawings, as long as it is a position capable of receiving sound output from a speaker (e.g., 380 in FIG. 6 and 7). In this case, the second microphone may be referred to as an "error microphone." Feedback control of an active noise control (ANC) sequence (e.g., FIG. 5) can be performed through the second microphone.

[0128] Although not separately indicated in FIGS. 7 through 10, the wearable electronic device (400) may include various additional electronic components in addition to the components mentioned above. According to one embodiment, the wearable electronic device (400) may further include a digital signal processor (DSP) and / or other processors. For example, the digital signal processor (DSP) may identify a signal (e.g., vibration) for sound received by the first microphone (440). The digital signal processor (DSP) may identify the signal for sound received by the first microphone (440) in the form of an analog or digital signal. Additionally, the digital signal processor (DSP) may receive a signal for sound received through a third microphone (e.g., 390 in FIGS. 6 and 7) and identify it in the form of an analog or digital signal. According to one embodiment, the digital signal processor (DSP) may further include a converter. The converter may convert a digital signal generated by processing in the digital signal processor into an analog signal. Figure 10 illustrates, for example, one part (409).

[0129] A wearable electronic device (400) according to one embodiment of the present disclosure may further include an acoustic filter (445) to block ultrasound. According to one embodiment, the acoustic filter (445) may be in the form of a duct having a predetermined length. According to one embodiment, the acoustic filter (445) may be formed at a position corresponding to a first microphone (440). According to one embodiment, the acoustic filter (445) may be placed between the first microphone (440) and the first opening (413). According to one embodiment, the acoustic filter (445) may be formed on the inner wall (4131) of the input conduit between the first microphone (440) and the first opening (413).

[0130] The components and features of the acoustic filter (445) for blocking ultrasound will be described in more detail below with reference to the embodiments of FIGS. 11 to 16.

[0131] FIG. 11 is a diagram illustrating the operating principle of an acoustic filter that blocks ultrasound according to an embodiment of the present disclosure. FIG. 12 is a graph illustrating the magnitude of amplitude for various frequency values ​​when a wearable electronic device is equipped with an acoustic filter that blocks ultrasound according to an embodiment of the present disclosure and when it is not equipped with an acoustic filter that blocks ultrasound. FIG. 13 is a diagram illustrating the operating principle of an acoustic filter that blocks ultrasound according to an embodiment of the present disclosure. FIG. 14 is a diagram illustrating an acoustic filter according to an embodiment of the present disclosure. FIG. 15 is a diagram illustrating an acoustic filter according to an embodiment of the present disclosure. FIG. 16 is a diagram illustrating an acoustic filter according to an embodiment of the present disclosure.

[0132] The components described with reference to FIGS. 11 to 16 may be partially or entirely identical to the components described with reference to FIGS. 1 to 10.

[0133] Referring to FIG. 11, the wearable electronic device (500) of the present disclosure (e.g., the electronic device (101) of FIG. 1 to FIG. 1, the wearable electronic device (300) of FIG. 3 to FIG. 7, and the wearable electronic device (400) of FIG. 8 to FIG. 10) may be configured such that the at least one processor can perform active noise control using the first microphone (540) in an environment where ultrasound is applied by including an acoustic filter (545) disposed between the first opening (513) and the first microphone (540).

[0134] The acoustic filter (545) may be a resonator having a duct shape that is recessed by a predetermined length in the acoustic input channel (5131) formed between the first opening (513) and the first microphone (540). Ultrasound corresponding to the resonant frequency of the resonator is reflected from the location of the resonator and does not reach the microphone (e.g., the first microphone (540)).

[0135] FIG. 12 shows the simulation results when a duct-shaped resonator with a length of 2.1 mm is applied as an acoustic filter (545). As shown in FIG. 12, when an acoustic filter (545) with a length of 2.1 mm is installed, it can be seen that resonance occurs around 40 kHz. As resonance occurs around 40 kHz, the amplitude of the ultrasound is significantly reduced. If an acoustic filter with these characteristics is placed in front of a microphone (e.g., a first microphone (540)) that performs an active noise control (ANC) function in a wearable electronic device (300), the effect of ultrasound entering the microphone can be effectively blocked (removed and / or reduced).

[0136] Although a simulation of ultrasound with a frequency of 40 kHz was performed in FIG. 12, the wearable electronic device of the present disclosure may be configured to block all ultrasound in a frequency range outside the audible frequency range of 20 to 20 kHz. That is, the wearable electronic device (500) of the present disclosure may be configured to block ultrasound of 20 kHz or higher.

[0137] Accordingly, the wearable electronic device (500) of the present disclosure may employ a duct-shaped resonator as an acoustic filter. According to one embodiment, the wearable electronic device (500) may include an acoustic filter (545) having a duct length (L) of 4.3 mm or less to block ultrasound of 20 kHz or higher. The duct-shaped resonator blocks ultrasound of higher frequency bands as the recessed length (L) from the acoustic input conduit becomes shorter. In order to block ultrasound, the length (L) of the duct-shaped resonator acts as an important parameter rather than the width (W).

[0138] In the embodiments of FIGS. 10 and 11, an acoustic filter (445, 545) in the form of a recessed duct is shown from an acoustic input conduit (4131, 5131), which is a path through which sound travels between the first opening (413, 513) and the first microphone (440, 540), but is not necessarily limited thereto. The acoustic filter (545) may be formed at a location other than the acoustic input conduit (5131) as long as it exists only between the first opening (513) and the first microphone (540). For example, regarding the acoustic filter (445, 545) formed in the acoustic input conduit (5131, 4131), the acoustic filter (445, 545) may be additionally or substantially formed on a substrate (e.g., the first substrate (470) of FIG. 10). According to one embodiment, the first microphone hole (441, 541) may be provided for collecting sound entering the first microphone (440, 540). The first microphone hole (441, 541) may be aligned with a hole (e.g., substrate hole (471) of FIG. 10) formed in a substrate (e.g., the first substrate (470) of FIG. 10). According to one embodiment, the acoustic filter (445, 545) may be formed as a duct-shaped resonator that is recessed by a predetermined length in a hole (e.g., substrate hole (471) of FIG. 10) of a substrate (e.g., the first substrate (470) of FIG. 10) placed between the first opening (413, 513) and the first microphone (440, 540). An acoustic filter formed in a hole (e.g., substrate hole (471) of FIG. 10) of a substrate (e.g., first substrate (470) of FIG. 10) may also have substantially the same shape as the acoustic filter (445, 545) shown in FIG. 10 and FIG. 11.

[0139] Referring to FIG. 13, the wearable electronic device (500) may employ a Helmholtz resonator as an acoustic filter. The Helmholtz resonator may be, for example, a resonator in which an air inlet path (or neck portion) is formed on at least one side and a space having a relatively large volume connected to the air inlet path is formed. For example, the Helmholtz resonator may include a neck portion having a predetermined length (L2-L1) and a predetermined area (A1), and a space formed to have a predetermined volume (Volume = product of L1 and A2). If the first resonance frequency of the Helmholtz resonator is set to correspond to one octave with respect to 40 kHz, a result similar to FIG. 12 may be obtained. For reference, if the resonance frequency of the Helmholtz resonator is expressed using parameters related to the length and area shown in FIG. 13, it can be expressed as follows [Equation 1].

[0140] [Equation 1]

[0141]

[0142] Here, v can be the speed of sound (e.g., ultrasound).

[0143] In this way, the wearable electronic device (500) can effectively block (remove and / or reduce) ultrasound by using an acoustic filter composed of various types of resonators.

[0144] Although not separately illustrated in the drawings, the acoustic filter (545) according to one embodiment may further include a mesh material in the part where sound enters. By additionally including a mesh material to act as resistive impedance, the blocking characteristics against ultrasound can be adjusted.

[0145] In the present disclosure, the method of forming a duct-shaped resonator constituting an acoustic filter or a Helmholtz resonator is not limited to any specific embodiment. For example, a resonator may be formed by processing an acoustic inlet conduit (5131). For another example, a resonator may be formed by processing a printed circuit board (PCB). For another example, a resonator may be formed by covering a part of the housing (510) with a separate structure or electronic component.

[0146] Referring to FIGS. 14 to 16, the acoustic filter of the present disclosure may include a plurality of acoustic filters.

[0147] According to one embodiment, the acoustic filter (545) may include a plurality of acoustic filters (545) formed between the first microphone and the first opening. According to one embodiment, when the acoustic filter (545) includes a plurality of acoustic filters, the plurality of acoustic filters may be configured to block ultrasound of different frequency bands. For example, the first acoustic filter (5451) may be configured to block a first frequency band, and the second acoustic filter (5452) may be configured to block a second frequency band. According to one embodiment, the first frequency band and the second frequency band may be frequency bands that do not overlap with each other, or they may be frequency bands that partially overlap with each other.

[0148] For example, as illustrated in FIGS. 14 and 15, a plurality of acoustic filters may include a first acoustic filter (5451) located at a first distance from the first opening and a second acoustic filter (5452) located at a second distance from the first opening that is further than the first distance.

[0149] According to one embodiment, as shown in FIG. 14, the first acoustic filter (5451) and the second acoustic filter (5452) may be formed to have substantially the same length as each other.

[0150] According to one embodiment, as illustrated in FIG. 15, the first acoustic filter (5451) may be formed to have a first length (L3), and the second acoustic filter (5452) may be formed to have a second length (L4). For example, the first length (L3) may be approximately 4.3 mm, and the second length (L4) may be approximately 2.1 mm. In this case, ultrasonic waves of 20 kHz can be blocked through the first acoustic filter (5451), and ultrasonic waves of 40 kHz can be blocked through the second acoustic filter (5452). However, it should be noted that this is merely an example and the embodiments of the present disclosure are not necessarily limited thereto.

[0151] For example, as illustrated in FIG. 16, the plurality of acoustic filters may include a first acoustic filter (5451) and a second acoustic filter (5452) located at a first distance from the first opening. In this case, the first acoustic filter (5451) and the second acoustic filter (5452) may be arranged to face each other.

[0152] In the embodiments of FIGS. 14 to 16 described above, embodiments including two acoustic filters as a plurality of acoustic filters are disclosed, but the scope of the present disclosure is not limited thereto. It should be noted that three or more acoustic filters may be further included as needed.

[0153] At least a portion of the device (e.g., modules or functions thereof) or method (e.g., operations) according to various embodiments may be implemented as instructions stored in a computer-readable storage medium, for example, in the form of program modules. When said instructions (which may be referred to as instruction(s)) are executed by a processor (e.g., processor (120) of FIG. 1), said one or more processors may perform functions corresponding to said instructions. The computer-readable storage medium may be, for example, a memory (e.g., memory (130) of FIG. 1). According to one embodiment of the present disclosure, a storage medium for storing a method of communication using an electronic device may be provided.

[0154] Computer-readable recording media may include hard disks, floppy disks, magnetic media (e.g., magnetic tape), optical recording media (e.g., CD-ROM (compact disc read only memory), DVD (digital versatile disc), magneto-optical media (e.g., floptical disk), hardware devices (e.g., ROM (read only memory), RAM (random access memory), or flash memory, etc.). In addition, program instructions may include not only machine code, such as that generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter, etc. The hardware device described above may be configured to operate as one or more software modules to perform the operations of various embodiments, and vice versa.

[0155] The electronic device according to the various embodiments of the present disclosure may be of various forms. The electronic device may include, for example, a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a consumer electronics device. The electronic device according to the embodiments of the present disclosure is not limited to the devices described above.

[0156] The various embodiments of the present disclosure and the terms used therein are not intended to limit the technical features described in the present disclosure to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of said embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of said items unless the relevant context clearly indicates otherwise. In the present disclosure, each of phrases such as “A or B”, “at least one of A and B”, “at least one of A or B”, “A, B or C”, “at least one of A, B and C”, and “at least one of A, B, or C” may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof. Terms such as “first,” “second,” or “first” or “second” may be used simply to distinguish a component from another component and do not limit the components in any other aspect (e.g., importance or order). Where any (e.g., first) component is referred to as “coupled” or “connected” to another (e.g., second) component, with or without the terms “functionally” or “communicationally,” it means that said component may be connected to said other component directly (e.g., wired), wirelessly, or through a third component.

[0157] The term “module” as used in various embodiments of the present disclosure may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit, for example. A module may be a component formed integrally, or a minimum unit of said component or a part thereof that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0158] Various embodiments of the present disclosure may be implemented as software (e.g., program (140)) comprising one or more instructions stored in a storage medium (e.g., internal memory (136) or external memory (138)) readable by a machine (e.g., electronic device (101)). For example, a processor (e.g., processor (120)) of the machine (e.g., electronic device (101)) may call at least one of the one or more instructions stored in the storage medium and execute it. This enables the machine to be operated to perform at least one function according to the at least one called instruction. The one or more instructions may include code generated by a compiler or code that can be executed by an interpreter. The storage medium readable by the machine may be provided in the form of a non-transitory storage medium. Here, 'non-temporary' simply means that the storage medium is a tangible device and does not contain a signal (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily.

[0159] According to one embodiment, the method according to the various embodiments disclosed herein may be provided by being included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily created in a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0160] According to various embodiments, each component (e.g., module or program) of the components described above may include a singular or multiple entities, and some of the multiple entities may be separated and placed in other components. According to various embodiments, one or more of the components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Generally or additionally, multiple components (e.g., module or program) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the multiple components in the same or similar manner as those performed by the corresponding component among the multiple components prior to integration. According to various embodiments, operations performed by the module, program, or other components may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

[0161] According to one embodiment of the present disclosure, a wearable electronic device (300; 400) may be provided. The wearable electronic device may include: a housing (310; 410) that forms the exterior of the wearable electronic device and includes at least one component inside; a speaker (380) disposed within the housing and configured to output sound through an acoustic output channel (321; 421) formed on one side of the housing; a first microphone (340; 440) configured to receive external sound for active noise control through a first opening (313; 413) formed at a first position of the housing that is exposed to the outside when the wearable electronic device is worn on a user's body; and a second microphone (390) disposed in the acoustic output channel and configured to receive sound output from the speaker. The at least one component may include at least one processor configured to enable the wearable electronic device to perform active noise control using the first microphone, the second microphone, and the speaker. By including an acoustic filter disposed between the first opening and the first microphone, the at least one processor may be configured to perform active noise control using the first microphone in an environment where ultrasound is applied.

[0162] According to one embodiment, the at least one processor may be configured to enable the wearable electronic device to perform feedforward control using a signal input from the first microphone, output sound from the speaker to cancel out the signal input from the first microphone, and perform feedback control using a signal input from the second microphone. The at least one processor may be configured to enable the wearable electronic device to perform feedforward control using the first microphone in an environment where ultrasound is applied.

[0163] According to one embodiment, the acoustic filter may include a resonator having a duct shape that is recessed by a predetermined length in an acoustic input channel formed between the first opening and the first microphone. According to one embodiment, the acoustic filter may include a resonator having a duct shape that is recessed by a predetermined length in a hole of a circuit board disposed between the first opening and the first microphone.

[0164] According to one embodiment, the acoustic filter may include a Helmholtz resonator formed to have a predetermined length, a predetermined width, and a predetermined volume in an acoustic input channel formed between the first opening and the first microphone.

[0165] According to one embodiment, the acoustic filter may include a plurality of acoustic filters formed between the first microphone and the first opening.

[0166] According to one embodiment, the plurality of acoustic filters may be configured to block ultrasound of different frequency bands.

[0167] According to one embodiment, the plurality of acoustic filters may include a first acoustic filter (5451) located at a first distance from the first opening and a second acoustic filter (5452) located at a second distance from the first opening that is further than the first distance.

[0168] According to one embodiment, the first acoustic filter (5451) includes a duct structure having a first length, and the second acoustic filter (5452) may include a duct structure having a second length different from the first length.

[0169] According to one embodiment, the plurality of acoustic filters includes a first acoustic filter and a second acoustic filter located at a first distance from the first opening, and the first acoustic filter and the second acoustic filter may be arranged to face each other.

[0170] According to one embodiment, the acoustic filter is configured to block ultrasonic waves of 20 kHz or higher, and if the acoustic filter is a resonator having a duct shape, the length of the duct may be 4.3 mm or less.

[0171] According to one embodiment, a grill may be placed in the first opening.

[0172] According to one embodiment, the acoustic filter may include a mesh material.

[0173] According to one embodiment, the first microphone may be configured to receive external sounds for active noise control and the user's voice when the wearable electronic device is worn on the user's body.

[0174] According to one embodiment, when the wearable electronic device is worn on the user's body, it may further include a third microphone (350) configured to receive the user's voice through a second opening formed at a second location different from the first location exposed to the outside of the housing.

[0175] According to one embodiment of the present disclosure, a wearable electronic device (300; 400) may be provided. The wearable electronic device may include: a housing (310; 410) forming the exterior of the wearable electronic device; a speaker (380) disposed in the internal space of the housing; a first microphone (340; 440) disposed adjacent to a first opening (313; 413) of the housing and formed to receive external sound for active noise control; a second microphone disposed adjacent to an output conduit (321; 421) through which sound output from the speaker of the housing is output and for acquiring sound output from the speaker; and at least one processor configured to receive analog signals input from the first microphone and the second microphone, convert them into digital signals, and output a sound of a second frequency to cancel out a sound of a first frequency from the first microphone with respect to the speaker. As an acoustic filter for blocking ultrasonic waves entering the first microphone through the first opening, it may include a duct-shaped acoustic filter that is recessed inward by a length of 4.3 mm or less from the side wall portion of the input channel between the first opening and the first microphone.

[0176] According to one embodiment, the first microphone may be configured to receive external sounds for active noise control and the user's voice when the wearable electronic device is worn on the user's body.

[0177] According to one embodiment, when the wearable electronic device is worn on the user's body, it may further include a third microphone (350) configured to receive the user's voice through a second opening formed at a second location different from the first location exposed to the outside of the housing.

[0178] According to one embodiment of the present disclosure, a wearable electronic device (300; 400) may be provided. The wearable electronic device comprises: a housing (310; 410) forming the exterior of the wearable electronic device; a speaker (380) disposed in the internal space of the housing; a first microphone (340; 440) disposed adjacent to a first opening (313; 413) of the housing and formed to receive external sound for active noise control; and a second microphone disposed adjacent to an output conduit (321; 421) through which sound output from the speaker of the housing is output and for acquiring sound output from the speaker. It may include a third microphone (350) positioned adjacent to the second opening (314; 414) of the housing and formed to receive user voice; and at least one processor configured to receive analog signals input from the first microphone and the second microphone, convert them into digital signals, and output a sound of a second frequency to cancel out a sound of a first frequency from the first microphone to the speaker. As an acoustic filter for blocking ultrasonic waves entering the first microphone through the first opening, it may include a Helmholtz resonator formed to have a predetermined length, a predetermined width, and a predetermined volume in an acoustic input conduit formed between the first opening and the first microphone.

[0179] According to one embodiment, the acoustic filter may be configured to block ultrasonic waves of 20 kHz or higher.

[0180] Although specific embodiments have been described in the detailed description of the present disclosure, it will be obvious to those skilled in the art that various modifications are possible within the scope of the present disclosure.

[0181] Although the present disclosure has been described by way of example with respect to one embodiment, it should be understood that one embodiment is for illustrative purposes only and is not intended to limit the present disclosure. It will be obvious to those skilled in the art that various changes in form and detailed configuration may be made without departing from the whole context of the present disclosure, including the appended claims and their equivalents.

Claims

1. In a wearable electronic device (300; 400), A housing (310; 410) that forms the exterior of a wearable electronic device and includes at least one component inside; A speaker (380) disposed within the housing and configured to output sound through an acoustic output channel (321; 421) formed on one side of the housing; A first microphone (340; 440) configured to receive external sound for active noise control through a first opening (313; 413) formed at a first position of the housing that is exposed to the outside when the wearable electronic device is worn on a user's body; It includes a second microphone (390) disposed in the above-mentioned acoustic output tube and configured to receive sound output from the speaker; The above at least one component includes at least one processor configured to enable the wearable electronic device to perform active noise control using the first microphone, the second microphone, and the speaker, and A wearable electronic device configured such that, by including an acoustic filter disposed between the first opening and the first microphone, the at least one processor can perform active noise control using the first microphone in an environment where ultrasound is applied.

2. In Paragraph 1, The at least one processor is configured to cause the wearable electronic device to perform feedforward control using a signal input from the first microphone, output sound from the speaker to cancel out the signal input from the first microphone, and perform feedback control using a signal input from the second microphone. A wearable electronic device configured such that at least one processor enables the wearable electronic device to perform feedforward control using the first microphone in an environment where ultrasound is applied.

3. In Paragraph 1 or 2, The above acoustic filter is a wearable electronic device comprising a resonator having a duct shape that is recessed by a predetermined length in an acoustic input conduit formed between the first opening and the first microphone.

4. In any one of paragraphs 1 to 3, The above acoustic filter is a wearable electronic device comprising a resonator having a duct shape that is recessed by a predetermined length in a hole of a circuit board disposed between the first opening and the first microphone.

5. In any one of paragraphs 1 to 4, The above acoustic filter is a wearable electronic device comprising a Helmholtz resonator formed to have a predetermined length, a predetermined width, and a predetermined volume in an acoustic input channel formed between the first opening and the first microphone.

6. In any one of paragraphs 1 to 5, The above acoustic filter is a wearable electronic device comprising a plurality of acoustic filters formed between the first microphone and the first opening.

7. In Paragraph 6, A wearable electronic device configured such that the plurality of acoustic filters are configured to block ultrasound of different frequency bands.

8. In Paragraph 6, A wearable electronic device comprising a plurality of acoustic filters including a first acoustic filter (5451) located at a first distance from the first opening and a second acoustic filter (5452) located at a second distance from the first opening that is further than the first distance.

9. In Paragraph 8, A wearable electronic device wherein the first acoustic filter (5451) comprises a duct structure having a first length, and the second acoustic filter (5452) comprises a duct structure having a second length different from the first length.

10. In Paragraph 6, A wearable electronic device wherein the plurality of acoustic filters include a first acoustic filter and a second acoustic filter located at a first distance from the first opening, and the first acoustic filter and the second acoustic filter are arranged to face each other.

11. In any one of paragraphs 1 to 4, The above acoustic filter is configured to block ultrasonic waves of 20 kHz or higher, and A wearable electronic device in which, when the above acoustic filter is a resonator having a duct shape, the length of the duct is 4.3 mm or less.

12. In any one of paragraphs 1 to 11, A wearable electronic device having a grille disposed in the first opening above.

13. In any one of paragraphs 1 through 12, The above acoustic filter is a wearable electronic device comprising a mesh material.

14. In any one of paragraphs 1 through 13, The first microphone is a wearable electronic device configured to receive external sounds and the user's voice for active noise control when the wearable electronic device is worn on the user's body.

15. In any one of paragraphs 1 through 13, A wearable electronic device further comprising a third microphone (350) configured to receive the user's voice through a second opening formed at a second position different from the first position exposed to the outside of the housing when the wearable electronic device is worn on the user's body.

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