Electronic device and controlling method for same

Abstract

This electronic device comprises a speaker, a microphone and a processor, wherein the processor can acquire a low frequency band ratio of a playback audio signal output through the speaker and a low frequency band ratio of a microphone audio signal received through the microphone, and process the playback audio signal on the basis of the low frequency band ratio of the playback audio signal and the low frequency band ratio of the microphone audio signal.

Description

Electronic device and method for controlling the same

[0001] The disclosed invention relates to an electronic device for outputting audio and a method for controlling the same.

[0002] Electronic devices that output audio may experience sound quality degradation, where audio signals such as sound or music sound worse than the original quality, depending on their installation location or playback space.

[0003] Excessive low-frequency distortion caused by this deterioration in sound quality can severely degrade the quality of the audio being played. Therefore, compensation for the low-frequency range is necessary, and this compensation is crucial for distortion-free sound reproduction.

[0004] In the past, the low-frequency band was compensated by having an electronic device generate impulsive noise for a certain period of time, using a microphone within the electronic device to obtain the transfer function (impulsive response (IR)) for the installation location of the electronic device, converting this to a frequency response (FR), and then calibrating it to match the standard FR.

[0005] Conventional methods require significant time and computational effort to obtain FR. This process is repeated every time the electronic device's location changes, especially when the device is portable. This further increases the time and computational effort required to obtain FR. Furthermore, when sound sources in a specific frequency band are unavailable or insufficient, FR accuracy is significantly reduced. In these cases, incorrect compensation can actually degrade sound quality.

[0006] One aspect of the disclosed invention provides an electronic device and a control method thereof that can quickly and simply compensate for a low-frequency band to provide high-quality sound regardless of the space in which the electronic device is installed.

[0007] An electronic device according to one aspect of the disclosed invention may include a speaker; a microphone; and a processor that obtains a low frequency band ratio of a reproduction audio signal output through the speaker and a low frequency band ratio of a microphone audio signal received through the microphone, and processes the reproduction audio signal based on the low frequency band ratio of the reproduction audio signal and the low frequency band ratio of the microphone audio signal.

[0008] A method for controlling an electronic device according to one aspect of the disclosed invention may include: obtaining a low frequency band ratio of a reproduction audio signal output through a speaker; obtaining a low frequency band ratio of a microphone audio signal received through a microphone; and processing the reproduction audio signal based on the low frequency band ratio of the reproduction audio signal and the low frequency band ratio of the microphone audio signal.

[0009] According to one aspect of the disclosed invention, a non-transitory storage medium stores computer-readable instructions, wherein the instructions, when executed by a processor, cause the processor to obtain a low frequency band ratio of a reproduction audio signal output through a speaker; obtain a low frequency band ratio of a microphone audio signal received through a microphone; and process the reproduction audio signal based on the low frequency band ratio of the reproduction audio signal and the low frequency band ratio of the microphone audio signal.

[0010] Figure 1 illustrates a network system implemented by various electronic devices.

[0011] FIG. 2 illustrates a control block diagram of an audio device according to one embodiment of the present disclosure.

[0012] FIG. 3 illustrates a control block diagram of a processor of an audio device according to one embodiment of the present disclosure.

[0013] FIG. 4 illustrates the operation of a processor of an audio device according to one embodiment of the present disclosure.

[0014] FIG. 5 illustrates an example of a flowchart of a method for controlling an audio device according to one embodiment of the present disclosure.

[0015] FIG. 6 illustrates an example of an RMS value for each frequency band of a playback audio signal in an audio device according to an embodiment of the present disclosure.

[0016] FIG. 7 illustrates an example of an RMS value for each frequency band of a microphone audio signal in an audio device according to one embodiment of the present disclosure.

[0017] FIG. 8 illustrates another example of an RMS value for each frequency band of a reproduced audio signal in an audio device according to one embodiment of the present disclosure.

[0018] FIG. 9 illustrates another example of an RMS value by frequency band of a microphone audio signal in an audio device according to one embodiment of the present disclosure.

[0019] It should be understood that the various embodiments and terms used in this document are not intended to limit the technical features described in this document to specific embodiments, but rather to encompass various modifications, equivalents, or alternatives of the embodiments.

[0020] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0021] 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.

[0022] In this document, each of the phrases "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 that phrase, or all possible combinations thereof.

[0023] The term "and / or" includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0024] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0025] When a component (e.g., a first component) is referred to as being "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0026] The terms "include" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0027] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0028] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0029] Hereinafter, electronic devices according to various embodiments will be specifically described with reference to the attached drawings.

[0030] Figure 1 illustrates a network system implemented by various electronic devices.

[0031] Referring to FIG. 1, an audio device (1) may include a communication module capable of communicating with another audio device, a user device (2), or a server (3), a user interface for receiving user input or outputting information to a user, at least one processor for controlling the operation of the audio device (1), and at least one memory in which a program for controlling the operation of the audio device (1) is stored.

[0032] The audio device (1) may be at least one of various types of audio products. For example, the audio device (1) may include, but is not limited to, at least one of a Wi-Fi speaker (10), a Bluetooth speaker (11), a sound bar (12), and a sound frame (13) as illustrated, and may include, for example, various types of home appliances such as a cleaning robot, a vacuum cleaner, and a television, which are not illustrated in the drawing. In addition, the audio devices and home appliances mentioned above are merely examples, and in addition to the audio devices and home appliances mentioned above, a device that is connected to another audio device, a user device (2), or a server (3) and can perform the operations described below may be included in the audio device (1) according to one embodiment.

[0033] The server (3) may include a communication module capable of communicating with another server, an audio device (1), or a user device (2), at least one processor capable of processing data received from another server, an audio device (1), or a user device (2), and at least one memory capable of storing a program for processing data or processed data. The server (3) may be implemented as various computing devices such as a workstation, a cloud, a data drive, or a data station. The server (3) may be implemented as one or more servers that are physically or logically separated based on function, detailed configuration of function, or data, and may transmit and receive data through communication between each server and process the transmitted and received data.

[0034] The server (3) can perform functions such as managing user accounts, registering audio devices (1) by linking them to user accounts, and managing or controlling registered audio devices (1). For example, a user can access the server (3) through a user device (2) and create a user account. The user account can be identified by an ID and password set by the user. The server (3) can register the audio device (1) to the user account according to a set procedure. For example, the server (3) can register, manage, and control the audio device (1) by linking identification information (e.g., serial number or MAC address) of the audio device (1) to the user account. The user device (2) can include a communication module capable of communicating with the audio device (1) or the server (3), a user interface for receiving user input or outputting information to the user, at least one processor for controlling the operation of the user device (2), and at least one memory in which a program for controlling the operation of the user device (2) is stored.

[0035] The user device (2) may be carried by the user or placed in the user's home or office, etc. The user device (2) may include, but is not limited to, a personal computer, a terminal, a portable telephone, a smart phone, a handheld device, a wearable device, etc.

[0036] A program for controlling the audio device (1), i.e., an application, may be stored in the memory of the user device (2). The application may be sold installed in the user device (2) or downloaded and installed from an external server.

[0037] A user can access a server (3) by executing an application installed on a user device (2), create a user account, and communicate with the server (3) based on the logged-in user account to register an audio device (1).

[0038] For example, when the audio device (1) is operated so that the audio device (1) can be connected to the server (3) according to the procedure guided by the application installed on the user device (2), the audio device (1) can be registered in the user account by registering the identification information (e.g., serial number or MAC address) of the audio device (1) in the corresponding user account on the server (3).

[0039] A user can control an audio device (1) using an application installed on a user device (2). For example, when a user logs into a user account using an application installed on the user device (2), an audio device (1) registered to the user account appears, and when a control command for the audio device (1) is input, the control command can be transmitted to the audio device (1) via the server (3).

[0040] A network can include both wired and wireless networks. Wired networks include cable networks or telephone networks, while wireless networks can include any network that transmits and receives signals via radio waves. Wired and wireless networks can be interconnected.

[0041] A network may include a wide area network (WAN) such as the Internet, a local area network (LAN) formed around an access point (AP), and / or a short-range wireless network that does not pass through an access point (AP). A short-range wireless network is, for example, a Bluetooth TM, IEEE 802.15.1), Zigbee (IEEE 802.15.4), Wi-Fi Direct, Near Field Communication (NFC), Z-Wave, etc., but are not limited to those exemplified.

[0042] An access point (AP) can connect an audio device (1) or a user device (2) to a wide area network (WAN) to which a server (3) is connected. The audio device (1) or the user device (2) can be connected to the server (3) via the wide area network (WAN).

[0043] Access Point (AP) is a Wi-Fi TM , IEEE 802.11), Bluetooth TM , IEEE 802.15.1), Zigbee (IEEE 802.15.4), etc., and can communicate with an audio device (1) or a user device (2) using wireless communication, and can connect to a wide area network (WAN) using wired communication, but is not limited thereto.

[0044] According to various embodiments, the audio device (1) may be directly connected to a user device (2) or a server (3) without going through an access point (AP).

[0045] The audio device (1) can be connected to a user device (2) or a server (3) via a long-range wireless network or a short-range wireless network.

[0046] For example, the audio device (1) can be connected to the user device (2) via a short-range wireless network (e.g., Wi-Fi Direct).

[0047] As another example, the audio device (1) may be connected to a user device (2) or a server (3) via a wide area network (WAN) using a long-distance wireless network (e.g., a cellular communication module).

[0048] As another example, an audio device (1) may be connected to a wide area network (WAN) using wired communication and may be connected to a user device (2) or a server (3) through the wide area network (WAN).

[0049] If the audio device (1) can connect to a wide area network (WAN) using wired communication, it can also function as a connection relay. Accordingly, the audio device (1) can connect other audio devices to the wide area network (WAN) to which the server (3) is connected. In addition, other audio devices can connect the audio device (1) to the wide area network (WAN) to which the server (3) is connected.

[0050] An audio device (1) can transmit information about its operation or status to another audio device, a user device (2), or a server (3) via a network. For example, the audio device (1) can transmit information about its operation or status to another audio device, a user device (2), or a server (3) when a request is received from a server (3), when a specific event occurs in the audio device (1), or periodically or in real time. When information about its operation or status is received from the audio device (1), the server (3) can update the information about the operation or status of the audio device (1) that has been stored therein, and transmit the updated information about the operation and status of the audio device (1) to the user device (2) via a network. Here, updating information can include various operations in which existing information is changed, such as an operation of adding new information to existing information, an operation of replacing existing information with new information, etc.

[0051] An audio device (1) can obtain various information from another audio device, a user device (2), or a server (3), and provide the obtained information to a user. For example, the audio device (1) can obtain information related to the function of the audio device (1) (e.g., playback audio information, etc.) and various environmental information (e.g., weather, temperature, humidity, etc.) from a server (3), and output the obtained information through a user interface.

[0052] The audio device (1) can operate according to a control command received from another audio device, a user device (2), or a server (3). For example, if the audio device (1) has obtained prior approval from the user to operate according to a control command from the server (3) even without a user input, the audio device (1) can operate according to a control command received from the server (3). Here, the control command received from the server (3) may include, but is not limited to, a control command input by the user through the user device (2) or a control command based on a preset condition.

[0053] The user device (2) can transmit information about the user to the audio device (1) or the server (3) via the communication module. For example, the user device (2) can transmit information about the user's location, health status, preferences, schedule, etc. to the server (3). The user device (2) can transmit information about the user to the server (3) with the user's prior consent.

[0054] The audio device (1), user device (2), or server (3) may determine a control command using technology such as artificial intelligence. For example, the server (3) may receive information regarding the operation or status of the audio device (1) or information regarding the user of the user device (2), process the information using technology such as artificial intelligence, and transmit the processing result or control command to the audio device (1) or user device (2) based on the processing result.

[0055] The electronic device (1) described below may correspond to the audio device (1) described above. However, the electronic device (1) is not limited to the audio device (1) described above, and may include various types of devices such as an audio system.

[0056] FIG. 2 is a control block diagram of an audio device according to one embodiment of the present disclosure.

[0057] Referring to FIG. 2, the audio device (1) may include a user interface (20), a communication unit (30), a microphone (40), a control unit (50), and a speaker (60).

[0058] The user interface (20) may include at least one input interface (21) and at least one output interface (22).

[0059] At least one input interface (21) can convert sensory information received from a user into an electrical signal.

[0060] At least one input interface (21) may include a power button, an operation button, a menu selection button, a setting button, etc. At least one input interface (21) may include, for example, a tact switch, a push switch, a slide switch, a toggle switch, a micro switch, a touch switch, a touch pad, a touch screen, and / or a jog dial.

[0061] At least one output interface (22) can visually or audibly convey information related to the operation of the audio device (1) to the user.

[0062] For example, at least one output interface (22) can transmit information related to the operation of the audio device (1) to the user. Information related to the operation of the audio device (1) can be output through a screen, an indicator, a voice, etc. At least one output interface (22) can include, for example, a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, etc.

[0063] The communication unit (30) may include at least one communication module. The communication module may support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between external devices, and the performance of communication through the established communication channel. According to one embodiment, the communication module may include a wireless communication module (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (e.g., a local area network (LAN) communication module, or a power line communication module). Among these communication modules, a corresponding communication module may communicate with the external device through a first network (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (e.g., a long-range communication network such as 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 different 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).

[0064] The short-range wireless communication module may include, but is not limited to, a Bluetooth communication module, a BLE (Bluetooth Low Energy) communication module, a near field communication module, a WLAN (Wi-Fi) communication module, a Zigbee communication module, an infrared (IrDA, infrared Data Association) communication module, a WFD (Wi-Fi Direct) communication module, an UWB (ultrawideband) communication module, an Ant+ communication module, a microwave (uWave) communication module, etc.

[0065] The remote communication module may include a communication module that performs various types of remote communication and may include a mobile communication unit. The mobile communication unit transmits and receives wireless signals with at least one of a base station, an external terminal, and a server on a mobile communication network.

[0066] In one embodiment, the communication module can communicate with external devices such as a server (3), a user device (2), and other audio devices via a peripheral access point (AP). The access point (AP) can connect a local area network (LAN) to which the audio device (1) or the user device (2) is connected to a wide area network (WAN) to which the server is connected. The audio device (1) or the user device (2) can be connected to the server (3) via the wide area network (WAN).

[0067] The communication unit (30) can receive data from the server (3) and transmit the received data to the control unit (50).

[0068] The microphone (40) may include a microphone. The microphone (40) may receive ambient sounds. The microphone (40) may receive playback audio output from the speaker (50). The microphone (40) may convert the received playback audio into an electrical signal and transmit it to the control unit (50).

[0069] The speaker (60) can output playback audio to the outside. The control unit (50) can play an audio signal and output it to the outside through the speaker (60).

[0070] The control unit (50) can be electrically connected to the user interface (20), communication unit (30), microphone (40), and speaker (60).

[0071] The control unit (50) may be implemented by including at least one memory (52) that stores program-type data for controlling the operation of components within the audio device (1), and at least one processor (51) that performs the aforementioned operation using the data stored in the at least one memory (52). In this case, the memory (52) and the processor (51) may each be implemented as separate chips. Alternatively, the memory (52) and the processor (51) may be implemented as a single chip.

[0072] The processor (51) can process output signals of the user interface (20), communication unit (30), microphone (40), and / or speaker (60), and may include an operation circuit, a memory circuit, and a control circuit that outputs a control signal to the user interface (20), communication unit (30), microphone (40), speaker (60), etc. based on the processed output signals.

[0073] Memory (52) may include volatile memory such as Static Random Access Memory (S-RAM), Dynamic Random Access Memory (D-RAM), and non-volatile memory such as Read Only Memory (ROM), Erasable Programmable Read Only Memory (EPROM), and flash memory.

[0074] The processor (51) can obtain the low frequency band ratio of the playback audio signal output through the speaker (60) and the low frequency band ratio of the microphone audio signal obtained through the microphone (40). The processor (51) can process the playback audio signal based on the low frequency band ratio of the playback audio signal and the low frequency band ratio of the microphone audio signal.

[0075] The processor (51) can correct the low frequency band of the reproduction audio signal so that the low frequency band ratio of the microphone audio signal and the low frequency band ratio of the reproduction audio signal match.

[0076] Therefore, regardless of the space in which the audio device (1) is installed, the low-frequency band can be quickly and simply corrected, so that audio similar to the original audio can be heard in the space.

[0077] FIG. 3 illustrates a control block diagram of a processor of an audio device according to one embodiment of the present disclosure. FIG. 4 illustrates the operation of a processor of an audio device according to one embodiment of the present disclosure.

[0078] Referring to FIGS. 3 and 4, the processor (51) may include a delay estimation unit (100), a band-pass filter unit (120), a ratio determination unit (130), and a gain determination unit (140).

[0079] The delay estimation unit (100) can estimate the delay between the playback audio signal and the microphone audio signal.

[0080] The delay estimation unit (100) can receive a playback audio signal and a microphone audio signal. The delay estimation unit (100) can receive a playback audio signal played through a speaker (60). The delay estimation unit (100) can receive a microphone audio signal received through a microphone (40).

[0081] The delay estimation unit (100) can estimate a delay value between the playback audio signal and the microphone audio signal by utilizing the correlation between the playback audio signal and the microphone audio signal. The estimated delay value can be applied to the playback audio signal to synchronize it with the microphone audio signal. Since the playback audio signal is output through the speaker (60) and the microphone audio signal is received through the microphone (40), a delay may occur between the two signals. The playback audio signal precedes the microphone audio signal.

[0082] For example, cross-correlation can be used to determine the similarity between two signals and estimate the delay between them. Cross-correlation is a measure of how similar one signal is to another. By calculating cross-correlation, the delay between the two signals can be determined.

[0083] The delay estimation unit (100) can synchronize the two signals by delaying the playback audio signal by τ samples since the playback audio signal is ahead of the microphone audio signal when the delay value between the playback audio signal and the microphone audio signal is τ.

[0084] The bandpass filter unit (120) can receive a synchronized playback audio signal and a microphone audio signal. The bandpass filter unit (120) can receive a playback audio signal delayed by the delay estimation unit (100). The bandpass filter unit (120) can receive a microphone audio signal.

[0085] The bandpass filter unit (120) can filter only the audio signals of each frequency band from the received playback audio signal and microphone audio signal.

[0086]

[0087] The bandpass filter unit (120) may include a high-pass filter (111) and a low-pass filter (112).

[0088] A mid-high band pass filter (111) may be a filter that passes the first frequency band.

[0089] For example, the first frequency band may include a mid-high frequency band. The mid-high frequency band may be from 500 Hz to 2500 Hz. Additionally, the mid-high frequency band may be from 300 Hz to 1500 Hz.

[0090] The mid-frequency band can be preset. The mid-frequency band is a band in which the frequency does not change significantly depending on the installation space size and reverberation conditions of the audio device (1), and can be used as a reference band to express the relative size of the low-frequency band, which is greatly affected by the installation space.

[0091] A low band pass filter (112) may be a filter that passes a second frequency band.

[0092] For example, the second frequency band may be a lower frequency band than the first frequency band. The second frequency band may include a low frequency band. The low frequency band may be between 1 Hz and 300 Hz. Additionally, the low frequency band may be between 70 Hz and 160 Hz.

[0093] The mid-high pass filter (111) can receive a reproduction audio signal and a microphone audio signal, and pass only the mid-high frequency band from the received reproduction audio signal and the microphone audio signal. For example, the mid-high pass filter (111) can filter the mid-high frequency band of 300 Hz to 1500 Hz from the reproduction audio signal and the microphone audio signal.

[0094] The low-pass filter (112) can receive a playback audio signal and a microphone audio signal. It can pass only a low-frequency band from the received playback audio signal and microphone audio signal. For example, the low-pass filter (112) can filter only a low-frequency band of 70 Hz to 160 Hz from the playback audio signal and microphone audio signal.

[0095] The ratio determination unit (130) can receive signals output from the bandpass filter unit (120).

[0096] The ratio determination unit (130) can receive a reproduction audio signal and a microphone audio signal of a mid-frequency band filtered by a mid-pass filter (111).

[0097] The ratio determination unit (130) can receive a reproduction audio signal and a microphone audio signal of a low frequency band filtered by a low pass filter (112).

[0098] The ratio determination unit (130) can determine the power (root mean square, RMS) of the reproduced audio signal for each frequency band based on the high- and low-frequency bands and the low-frequency bands of the filtered reproduced audio signal. The RMS value is one of the measurement methods that indicates the amplitude of a signal. It can be calculated by averaging the squares of the signal over a predetermined period of time and taking the square root. The RMS value represents the energy of the signal and can indicate the intensity of the audio.

[0099] The ratio determination unit (130) can determine the average RMS of the high-frequency band and the average RMS of the low-frequency band of the reproduced audio signal.

[0100] The ratio determination unit (130) can determine the ratio of the low frequency band of the reproduced audio signal based on the average RMS of the mid-high frequency band and the average RMS of the low frequency band of the reproduced audio signal. The ratio determination unit (130) can determine the RMS ratio of the low frequency band to the mid-high frequency band of the reproduced audio signal.

[0101] Additionally, the ratio determination unit (130) can determine the RMS for each frequency band of the microphone audio signal based on the high-frequency band and the low-frequency band of the filtered microphone audio signal.

[0102] The ratio determination unit (130) can determine the average RMS of the high-frequency band and the average RMS of the low-frequency band of the microphone audio signal.

[0103] The ratio determination unit (130) can determine the ratio of the low frequency band of the microphone audio signal based on the average RMS of the mid-high frequency band and the average RMS of the low frequency band of the microphone audio signal. The ratio determination unit (130) can determine the RMS ratio of the low frequency band to the mid-high frequency band of the microphone audio signal.

[0104] The ratio determination unit (130) can output the ratio value of the low frequency band of the reproduction audio signal and the ratio value of the low frequency band of the microphone audio signal to the gain determination unit (140). The ratio value of the low frequency band of the reproduction audio signal and the ratio value of the low frequency band of the microphone audio signal can be compared with each other and used as a reference value for determining a correction gain for correcting the low frequency band of the actual audio device (1) described later.

[0105] The gain determination unit (140) can receive the ratio value of the low frequency band of the reproduction audio signal and the ratio value of the low frequency band of the microphone audio signal from the ratio determination unit (130).

[0106] The gain determination unit (140) can determine a correction gain for adjusting the ratio value of the low frequency band of the microphone audio signal based on the ratio value of the low frequency band of the received reproduction audio signal and the ratio value of the low frequency band of the microphone audio signal.

[0107] The gain determination unit (140) can determine a correction gain for adjusting the ratio value of the low frequency band of the microphone audio signal so that the ratio value of the low frequency band of the microphone audio signal follows the ratio value of the low frequency band of the reproduction audio signal.

[0108] If the ratio of the low frequency band to the high and mid frequency band of the microphone audio signal is higher than the ratio of the low frequency band to the high and mid frequency band of the reproduced audio, the gain determining unit (140) determines that the space where the audio device (1) is installed is a space where a booming phenomenon of the low frequency band occurs, and applies a negative gain value to the reproduced audio signal, thereby making the ratio of the low frequency band similar to that of the original audio. The booming phenomenon is a phenomenon in which the low frequency band is amplified in the space where audio is reproduced.

[0109] Meanwhile, if the ratio of the low frequency band to the high and mid frequency band of the microphone audio signal is lower than the ratio of the low frequency band to the high and mid frequency band of the reproduced audio, the gain determination unit (140) determines that the space where the audio device (1) is installed is a space where a lot of low frequency band is absorbed, and applies a plus gain value to the reproduced audio signal, thereby making the ratio of the low frequency band similar to the ratio of the original audio.

[0110] FIG. 5 illustrates an example of a flowchart of a method for controlling an audio device according to one embodiment of the present disclosure.

[0111] Referring to FIG. 5, the processor (51) can obtain the low frequency band ratio of the playback audio signal output through the speaker (60) (200).

[0112] The processor (51) can estimate a delay value between the playback audio signal and the microphone audio signal and apply the delay value to the playback audio signal to synchronize the playback audio signal and the microphone audio signal.

[0113] The processor (51) can filter the high and mid-frequency bands and the low-frequency band from the synchronized playback audio signal. For example, the high and mid-frequency bands may be 300 Hz to 1500 Hz. The high and mid-frequency bands may be preset and stored in the memory (52). The high and mid-frequency bands may be bands in which the frequency changes little depending on the installation space size and reverberation conditions of the audio device (1). The high and mid-frequency bands may be used as a reference band to express the relative size of the low-frequency band, which is greatly affected by the installation space. The low-frequency bands may be 70 Hz to 160 Hz.

[0114] The processor (51) can determine the average RMS of the high-frequency band and the average RMS of the low-frequency band of the filtered playback audio signal based on the high-frequency band and the low-frequency band of the filtered playback audio signal.

[0115] The processor (51) can determine the RMS ratio of the low frequency band to the high frequency band of the reproduced audio signal based on the average RMS of the high frequency band and the average RMS of the low frequency band of the reproduced audio signal.

[0116] Additionally, the processor (51) can obtain a low frequency band ratio of a microphone audio signal received through a microphone (40) (202).

[0117] The processor (51) can filter the high and low frequency bands from the microphone audio signal. For example, the high and low frequency bands may be 300 Hz to 1500 Hz. The high and low frequency bands may be preset and stored in the memory (52). The low frequency band may be 70 Hz to 160 Hz.

[0118] The processor (51) can determine the average RMS of the high-frequency band and the average RMS of the low-frequency band of the microphone audio signal based on the high-frequency band and the low-frequency band of the filtered microphone audio signal.

[0119] The processor (51) can determine the RMS ratio of the low frequency band to the high frequency band of the microphone audio signal based on the average RMS of the high frequency band and the average RMS of the low frequency band of the microphone audio signal.

[0120] The processor (51) can process the playback audio signal based on the low frequency band ratio of the playback audio signal and the low frequency band ratio of the microphone audio signal (204).

[0121] The processor (51) can determine a correction gain for adjusting the ratio value of the low frequency band of the microphone audio signal based on the ratio value of the low frequency band of the reproduction audio signal and the ratio value of the low frequency band of the microphone audio signal. The processor (51) can determine a correction gain for adjusting the ratio value of the low frequency band of the microphone audio signal so that the ratio value of the low frequency band of the microphone audio signal follows the ratio value of the low frequency band of the reproduction audio signal.

[0122] When the low frequency band ratio to the high and mid frequency band ratio of the microphone audio signal is higher than the low frequency band ratio to the high and mid frequency band ratio of the reproduced audio, the processor (51) can reduce the correction gain value applied to the reproduced audio signal to prevent sound quality degradation due to the booming phenomenon of the low frequency band, thereby making the ratio of the low frequency band similar to that of the original audio.

[0123] When the ratio of the low frequency band to the high and mid frequency band of the microphone audio signal is lower than the ratio of the low frequency band to the high and mid frequency band of the reproduced audio, the processor (51) can increase a correction gain value applied to the reproduced audio signal to prevent sound quality degradation due to absorption of the low frequency band, thereby making the ratio of the low frequency band similar to that of the original audio.

[0124] FIG. 6 illustrates an example of an RMS value for each frequency band of a playback audio signal in an audio device according to an embodiment of the present disclosure.

[0125] Referring to Figure 6, the horizontal axis represents frequency and the vertical axis represents RMS.

[0126] The low-pass RMS of the reproduced audio signal may include the average RMS of a low-frequency band. The low-frequency band may be L1 to L2, and may be 70 Hz to 160 Hz.

[0127] The mid-band RMS of the reproduced audio signal may include the average RMS of the mid-frequency band. The mid-frequency band may be from M to H and may be from 300 Hz to 1500 Hz. The mid-frequency band of the reproduced audio signal may be preset.

[0128] Figure 6 shows a case where the low-pass RMS of the reproduced audio signal is lower than the mid- and high-pass RMS.

[0129] The processor (51) can determine the low frequency band ratio of the reproduced audio signal.

[0130] The low frequency band ratio of the reproduced audio signal may include the RMS ratio of the low frequency band to the mid-high frequency band of the reproduced audio signal (low frequency RMS / mid-high frequency RMS).

[0131] FIG. 7 illustrates an example of an RMS value for each frequency band of a microphone audio signal in an audio device according to one embodiment of the present disclosure.

[0132] Referring to Figure 7, the horizontal axis represents frequency and the vertical axis represents RMS.

[0133] The low-pass RMS of a microphone audio signal may include the average RMS of a low-frequency band. The low-frequency band may be L1 to L2, and may be 70 Hz to 160 Hz.

[0134] The mid-band RMS of a microphone audio signal may include the average RMS of the mid-frequency band. The mid-frequency band may be M to H, and may be 300 Hz to 1500 Hz. The mid-frequency band of the microphone audio signal may be preset.

[0135] Figure 7 shows a case where the low-pass RMS of the microphone audio signal before compensation is equal to the mid- and high-pass RMS.

[0136] The processor (51) can determine the low frequency band ratio of the microphone audio signal.

[0137] The low frequency band ratio of a microphone audio signal may include the RMS ratio of the low frequency band to the mid-high frequency band of the microphone audio signal (low frequency RMS before correction / mid-high frequency RMS).

[0138] Referring to FIGS. 6 and 7, for example, if the RMS ratio of the low frequency band to the mid-high frequency band of the reproduced audio signal (low frequency RMS / mid-high band RMS) is 0.7, and the RMS ratio of the low frequency band to the mid-high frequency band of the microphone audio signal (low frequency RMS before correction / mid-high band RMS) is 1, this may indicate that the low frequency band of the microphone audio signal has increased compared to the original audio signal. This may mean that the space where the audio device (1) is installed is a space where a low frequency band booming phenomenon occurs, and thus the low frequency band of the microphone audio has increased.

[0139] By reducing the pre-compensation RMS of the microphone audio signal to the post-compensation RMS, the low-frequency band ratio of the playback audio signal can be matched to the low-frequency band ratio of the microphone audio signal.

[0140] Therefore, by determining a correction gain value to reduce the RMS before correction to the RMS after correction and applying this correction gain value to the playback audio signal, the low frequency band ratio of the playback audio signal can be matched with the low frequency band ratio of the microphone audio signal.

[0141] Meanwhile, the low frequency band ratio of the playback audio signal may include the difference between the high and mid frequency band dB (decibels) and the low frequency band dB of the playback audio signal. The low frequency band ratio of the microphone audio signal may include the difference between the high and mid frequency band dB (decibels) and the low frequency band dB of the microphone audio signal.

[0142] Instead of comparing the RMS ratio of the low frequency band to the high and mid frequency band of the playback audio signal (low-pass RMS / mid-high-pass RMS) with the RMS ratio of the low frequency band to the high and mid frequency band of the microphone audio signal (low-pass RMS / mid-high-pass RMS), the RMS of each frequency band can be converted to dB, the dB difference in the playback audio signal can be compared with the dB difference in the microphone audio signal, and the playback audio signal can be processed to match the dB difference in the microphone audio signal to the dB difference in the playback audio signal.

[0143] dB can express the relative strength of a signal using a logarithmic scale. Converting an RMS value to dB expresses the strength of a given signal in decibels.

[0144] As shown in the following equation [1], the RMS value can be converted to dB using an exponential function.

[0145] dB = 20·log 10 (RMS) - Equation [1]

[0146] For example, let's assume that the dB-converted value of the mid-high band RMS of a playback audio signal is 40 dB, and the dB-converted value of the low band RMS is 35 dB. In this case, the dB difference based on the low band RMS is -5 dB (35 dB - 40 dB).

[0147] Also, assume that the dB-converted value of the mid-high band RMS of the microphone audio signal is 40 dB, and the dB-converted value of the low-pass RMS is 40 dB. In this case, the dB difference based on the low-pass RMS is 0 dB (35 dB-40 dB).

[0148] As dB increases from -5dB to 0dB, we can see that the low frequency band has increased.

[0149] Therefore, by determining a compensation gain to reduce 0 dB to -5 dB and applying this compensation gain to the reproduction audio signal, the low frequency band of the reproduction audio signal can be reduced.

[0150] If the audio device (1) is installed in a corner very close to the back wall or side wall, when the playback audio is generated into the space through the speaker (60), a booming phenomenon occurs in which the low frequency band resonates louder than the original audio.

[0151] An audio device (1) according to one embodiment of the present disclosure can prevent a low-frequency band booming phenomenon of audio played back in a space regardless of the installation space of the audio device (1) by correcting the low-frequency band ratio to match the low-frequency band ratio of the original sound even when the installation space of the audio device (1) changes. Accordingly, a user can hear audio similar to the original audio in the space.

[0152] FIG. 8 illustrates another example of an RMS value for each frequency band of a reproduced audio signal in an audio device according to one embodiment of the present disclosure.

[0153] Referring to Figure 8, the horizontal axis represents frequency and the vertical axis represents RMS.

[0154] The low-pass RMS of the reproduced audio signal may include the average RMS of a low-frequency band. The low-frequency band may be L1 to L2, and may be 70 Hz to 160 Hz.

[0155] The mid-band RMS of the reproduced audio signal may include the average RMS of the mid-frequency band. The mid-frequency band may be from M to H and may be from 300 Hz to 1500 Hz. The mid-frequency band of the reproduced audio signal may be preset.

[0156] Figure 8 shows a case where the low-frequency RMS of the reproduced audio signal is higher than the mid-high-frequency RMS.

[0157] The processor (51) can determine the low frequency band ratio of the reproduced audio signal.

[0158] The low frequency band ratio of the reproduced audio signal may include the RMS ratio of the low frequency band to the mid-high frequency band of the reproduced audio signal (low frequency RMS / mid-high frequency RMS).

[0159] FIG. 9 illustrates another example of an RMS value by frequency band of a microphone audio signal in an audio device according to one embodiment of the present disclosure.

[0160] Referring to Figure 9, the horizontal axis represents frequency and the vertical axis represents RMS.

[0161] The low-pass RMS of a microphone audio signal may include the average RMS of a low-frequency band. The low-frequency band may be L1 to L2, and may be 70 Hz to 160 Hz.

[0162] The mid-band RMS of a microphone audio signal may include the average RMS of the mid-frequency band. The mid-frequency band may be M to H, and may be 300 Hz to 1500 Hz. The mid-frequency band of the microphone audio signal may be preset.

[0163] Figure 9 shows a case where the low-pass RMS of the microphone audio signal before compensation is lower than the mid- and high-pass RMS.

[0164] The processor (51) can determine the low frequency band ratio of the microphone audio signal.

[0165] The low frequency band ratio of a microphone audio signal may include the RMS ratio of the low frequency band to the mid-high frequency band of the microphone audio signal (low frequency RMS before correction / mid-high frequency RMS).

[0166] Referring to FIGS. 8 and 9, for example, if the RMS ratio of the low frequency band to the mid-high frequency band of the reproduced audio signal (low frequency RMS / mid-high band RMS) is 1.2, and the RMS ratio of the low frequency band to the mid-high frequency band of the microphone audio signal (low frequency RMS before correction / mid-high band RMS) is 0.8, this may indicate that the low frequency band of the microphone audio signal is reduced compared to the original audio signal. This may mean that the space where the audio device (1) is installed is a space where low frequency band absorption occurs, and thus the low frequency band of the microphone audio is reduced.

[0167] By increasing the pre-compensation RMS of the microphone audio signal to the post-compensation RMS, the low-frequency band ratio of the playback audio signal can be matched with the low-frequency band ratio of the microphone audio signal.

[0168] Therefore, by determining a correction gain value to increase the RMS before correction to the RMS after correction and applying this correction gain value to the playback audio signal, the low frequency band ratio of the playback audio signal can be matched with the low frequency band ratio of the microphone audio signal.

[0169] Meanwhile, the low frequency band ratio of the playback audio signal may include the difference between the high and mid frequency band dB (decibels) and the low frequency band dB of the playback audio signal. The low frequency band ratio of the microphone audio signal may include the difference between the high and mid frequency band dB (decibels) and the low frequency band dB of the microphone audio signal.

[0170] The RMS of each frequency band can be converted to dB units, the dB difference of the playback audio signal can be compared with the dB difference of the microphone audio signal, and the playback audio signal can be processed to match the dB difference of the microphone audio signal to the dB difference of the playback audio signal.

[0171] For example, assume that the dB-converted value of the mid-high band RMS of a playback audio signal is 40 dB, and the dB-converted value of the low band RMS is 45 dB. In this case, the dB difference based on the low band RMS is 5 dB (45 dB-40 dB).

[0172] Additionally, assume that the dB-converted value of the mid-high band RMS of the microphone audio signal is 40 dB, and the dB-converted value of the low-pass RMS is 35 dB. In this case, the dB difference based on the low-pass RMS is -5 dB (35 dB - 40 dB).

[0173] We can see that the low frequency band has increased as the dB has decreased from 5dB to -5dB.

[0174] Therefore, by determining a compensation gain to increase -5dB to 5dB and applying this compensation gain to the playback audio signal, the low frequency band of the playback audio signal can be increased.

[0175] When the audio device (1) is installed in the center of the space, when the playback audio is generated into the space through the speaker (60), due to the absorption of the low-frequency band, the audio played in the space may not have a sufficient low-frequency band as much as the low-frequency band of the original audio.

[0176] An audio device (1) according to one embodiment of the present disclosure can allow a user to experience audio similar to the low frequency band ratio of the original audio regardless of the installation space of the audio device (1) by correcting the low frequency band ratio to match the low frequency band ratio of the original sound even when the installation space of the audio device (1) changes.

[0177] As described above, the audio device (1) can be freely installed according to each individual's spatial environment, and the low-frequency band can be quickly and simply corrected, so that the user can hear audio quality similar to the original audio in the space.

[0178] Meanwhile, the audio device (1) according to one embodiment of the present disclosure can be applied not only to the time domain but also to the frequency domain.

[0179] In this case, the processor (51) may include an FFT (Fourier Transform, FFT) processing unit that converts the time domain into the frequency domain instead of the bandpass filter unit (120). The ratio determining unit (130) may determine the FFT size of the high- and mid-frequency bands and the FFT size of the low-frequency band, and determine the ratio of the low-frequency band based on each size.

[0180] An electronic device according to one embodiment of the present disclosure may include a speaker; a microphone; and a processor that obtains a low frequency band ratio of a reproduction audio signal output through the speaker and a low frequency band ratio of a microphone audio signal received through the microphone, and processes the reproduction audio signal based on the low frequency band ratio of the reproduction audio signal and the low frequency band ratio of the microphone audio signal.

[0181] The processor may estimate a delay value using a correlation between the playback audio signal and the microphone audio signal, and apply the delay value to the playback audio signal to synchronize the playback audio signal and the microphone audio signal.

[0182] The above processor can filter the high-frequency band and the low-frequency band from the above reproduction audio signal and the above microphone audio signal.

[0183] The processor may determine an average RMS (root mean square) for each frequency band of the reproduced audio signal based on the high and medium frequency bands and the low frequency band of the filtered reproduced audio signal, and may determine a ratio of the low frequency band to the high and medium frequency band of the reproduced audio signal based on the average RMS of the high and medium frequency bands and the average RMS of the low frequency band.

[0184] The processor may determine an average RMS (root mean square) for each frequency band of the reproduced audio signal based on the high and low frequency bands and the low frequency band of the filtered reproduced audio signal, determine a dB difference between the high and low frequency band and the low frequency band based on the average RMS of the high and low frequency band and the average RMS of the low frequency band, and determine a ratio of the low frequency band of the reproduced audio signal based on the dB difference.

[0185] The processor may determine an average RMS (root mean square) for each frequency band of the microphone audio signal based on the high-frequency band and the low-frequency band of the filtered microphone audio signal, and may determine a ratio of the low-frequency band to the high-frequency band of the microphone audio signal based on the average RMS of the high-frequency band and the average RMS of the low-frequency band.

[0186] The processor may determine an average RMS (root mean square) for each frequency band of the microphone audio signal and the filtered microphone audio signal based on the high-frequency band and the low-frequency band, determine a dB difference between the high-frequency band and the low-frequency band based on the average RMS of the high-frequency band and the average RMS of the low-frequency band, and determine a ratio of the low-frequency band of the microphone audio signal based on the dB difference.

[0187] The processor can determine a correction gain for adjusting a ratio value of a low frequency band of the microphone audio signal based on a low frequency band ratio of the playback audio signal and a low frequency band ratio of the microphone audio signal.

[0188] The above processor can determine the correction gain value so that the ratio value of the low frequency band of the microphone audio signal follows the ratio value of the low frequency band of the reproduction audio signal.

[0189] The above processor can process the playback audio signal by applying the correction gain value to the playback audio signal output through the speaker.

[0190] The processor may apply a negative compensation gain to the playback audio signal when the low frequency band ratio of the microphone audio signal is higher than the low frequency band ratio of the playback audio signal.

[0191] The processor may apply a plus compensation gain to the playback audio signal when the low frequency band ratio of the microphone audio signal is lower than the low frequency band ratio of the playback audio signal.

[0192] A control method of an electronic device according to one embodiment of the present disclosure may include: obtaining a low frequency band ratio of a reproduction audio signal output through a speaker; obtaining a low frequency band ratio of a microphone audio signal received through a microphone; and processing the reproduction audio signal based on the low frequency band ratio of the reproduction audio signal and the low frequency band ratio of the microphone audio signal.

[0193] Obtaining the low frequency band ratio of the above-mentioned reproduction audio signal may include filtering a high and medium frequency band and a low frequency band from the reproduction audio signal, determining an average RMS (root mean square) for each frequency band of the reproduction audio signal based on the filtered high and medium frequency band and the low frequency band of the reproduction audio signal, and determining a ratio of the low frequency band to the high and medium frequency band of the reproduction audio signal based on the average RMS of the high and medium frequency band and the average RMS of the low frequency band.

[0194] Obtaining the low frequency band ratio of the above-mentioned reproduction audio signal may include filtering a high and middle frequency band and a low frequency band from the reproduction audio signal, determining an average RMS (root mean square) for each frequency band of the reproduction audio signal based on the filtered high and middle frequency band and the low frequency band of the reproduction audio signal, determining a dB difference between the high and middle frequency band and the low frequency band based on the average RMS of the high and middle frequency band and the average RMS of the low frequency band, and determining a ratio of the low frequency band of the reproduction audio signal based on the dB difference.

[0195] Obtaining a low frequency band ratio of the microphone audio signal may include filtering a high and medium frequency band and a low frequency band from the microphone audio signal, determining an average RMS (root mean square) for each frequency band of the microphone audio signal based on the high and medium frequency band and the low frequency band of the filtered microphone audio signal, and determining a ratio of the low frequency band to the high and medium frequency band of the microphone audio signal based on the average RMS of the high and medium frequency band and the average RMS of the low frequency band.

[0196] Obtaining a low frequency band ratio of the microphone audio signal may include filtering a high and middle frequency band and a low frequency band from the microphone audio signal, determining an average RMS (root mean square) for each frequency band of the microphone audio signal based on the high and middle frequency band and the low frequency band of the filtered microphone audio signal, determining a dB difference between the high and middle frequency band and the low frequency band based on the average RMS of the high and middle frequency band and the average RMS of the low frequency band, and determining a ratio of the low frequency band of the microphone audio signal based on the dB difference.

[0197] Processing the above-described playback audio may include determining a correction gain value based on a low frequency band ratio of the playback audio signal and a low frequency band ratio of the microphone audio signal so that a ratio value of the low frequency band of the microphone audio signal follows a ratio value of the low frequency band of the playback audio signal, and applying the correction gain value to a signal of the playback audio output through the speaker.

[0198] Processing the above-described playback audio may include applying a minus correction gain value to the playback audio signal when a low frequency band ratio of the microphone audio signal is higher than a low frequency band ratio of the playback audio signal, and processing the above-described playback audio may include applying a minus correction gain value to the playback audio signal when a low frequency band ratio of the microphone audio signal is lower than a low frequency band ratio of the playback audio signal.

[0199] According to one embodiment of the present disclosure, a non-transitory storage medium stores computer-readable instructions, wherein the instructions, when executed by a processor, cause the processor to obtain a low frequency band ratio of a reproduction audio signal output through a speaker; obtain a low frequency band ratio of a microphone audio signal received through a microphone; and process the reproduction audio signal based on the low frequency band ratio of the reproduction audio signal and the low frequency band ratio of the microphone audio signal.

[0200] Meanwhile, the disclosed embodiments may be implemented in the form of a storage medium storing computer-executable instructions. The instructions may be stored in the form of program code, and when executed by a processor, may generate program modules to perform the operations of the disclosed embodiments.

[0201] A device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, the term "non-transitory storage medium" simply means a tangible device that does not contain signals (e.g., electromagnetic waves). This term does not distinguish between cases where data is permanently stored in the storage medium and cases where data is temporarily stored. For example, a "non-transitory storage medium" may include a buffer in which data is temporarily stored.

[0202] According to one embodiment, the method according to various embodiments disclosed in the present document may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) via 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 (e.g., a downloadable app) may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0203] The disclosed embodiments have been described with reference to the attached drawings as described above. Those skilled in the art will understand that the present invention can be implemented in forms other than the disclosed embodiments without altering the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

Claims

1. Speaker; Mike; and An electronic device comprising a processor for obtaining a low frequency band ratio of a reproduction audio signal output through the speaker and a low frequency band ratio of a microphone audio signal received through the microphone, and processing the reproduction audio signal based on the low frequency band ratio of the reproduction audio signal and the low frequency band ratio of the microphone audio signal.

2. In paragraph 1, The above processor, An electronic device that estimates a delay value using a correlation between the playback audio signal and the microphone audio signal, and applies the delay value to the playback audio signal to synchronize the playback audio signal and the microphone audio signal.

3. In paragraph 1, The above processor, An electronic device for filtering high-frequency bands and low-frequency bands from the above-mentioned playback audio signal and the above-mentioned microphone audio signal.

4. In paragraph 3, The above processor, An electronic device for determining an average RMS (root mean square) for each frequency band of the reproduced audio signal based on the high and low frequency bands and the low frequency band of the filtered reproduced audio signal, and for determining a ratio of the low frequency band to the high and low frequency band of the reproduced audio signal based on the average RMS of the high and low frequency bands and the average RMS of the low frequency band.

5. In paragraph 3, The above processor, An electronic device that determines an average RMS (root mean square) for each frequency band of the reproduced audio signal based on the high and low frequency bands and the low frequency band of the filtered reproduced audio signal, determines a dB difference between the high and low frequency band and the low frequency band based on the average RMS of the high and low frequency band and the average RMS of the low frequency band, and determines a ratio of the low frequency band of the reproduced audio signal based on the dB difference.

6. In paragraph 3, The above processor, An electronic device for determining an average RMS (root mean square) for each frequency band of the microphone audio signal based on the high-frequency band and the low-frequency band of the filtered microphone audio signal, and for determining a ratio of the low-frequency band to the high-frequency band of the microphone audio signal based on the average RMS of the high-frequency band and the average RMS of the low-frequency band.

7. In paragraph 3, The above processor, An electronic device that determines an average RMS (root mean square) for each frequency band of the microphone audio signal and the filtered microphone audio signal based on the high-frequency band and the low-frequency band, determines a dB difference between the high-frequency band and the low-frequency band based on the average RMS of the high-frequency band and the average RMS of the low-frequency band, and determines a ratio of the low-frequency band of the microphone audio signal based on the dB difference.

8. In paragraph 1, The above processor, An electronic device that determines a correction gain for adjusting a ratio value of a low frequency band of the microphone audio signal based on a low frequency band ratio of the above-described reproduction audio signal and a low frequency band ratio of the above-described microphone audio signal.

9. In paragraph 8, The above processor, An electronic device that determines the compensation gain value so that the ratio value of the low frequency band of the microphone audio signal follows the ratio value of the low frequency band of the reproduction audio signal.

10. In paragraph 8, The above processor, An electronic device that processes a reproduction audio signal by applying the above compensation gain value to the reproduction audio signal output through the speaker.

11. In paragraph 8, The above processor, An electronic device that applies a negative compensation gain to the playback audio signal when the low frequency band ratio of the microphone audio signal is higher than the low frequency band ratio of the playback audio signal.

12. In paragraph 8, The above processor, An electronic device that applies a plus compensation gain to the reproduction audio signal when the low frequency band ratio of the microphone audio signal is lower than the low frequency band ratio of the reproduction audio signal.

13. Obtain the low frequency band ratio of the playback audio signal output through the speaker; Obtaining a low frequency band ratio of a microphone audio signal received through a microphone; A control method of an electronic device, comprising: processing the playback audio signal based on a low frequency band ratio of the playback audio signal and a low frequency band ratio of the microphone audio signal; 14. In paragraph 13, Obtaining the low frequency band ratio of the above playback audio signal is: Filtering the mid-high frequency band and the low frequency band from the above playback audio signal, Determine the average RMS (root mean square) of the playback audio signal and frequency band based on the high-frequency band and low-frequency band of the filtered playback audio signal, A control method of an electronic device, comprising determining a ratio of a low frequency band to a high frequency band of the reproduced audio signal based on an average RMS of the high frequency band and an average RMS of the low frequency band.

15. In paragraph 13, Obtaining the low frequency band ratio of the above playback audio signal is: Filtering the mid-high frequency band and the low frequency band from the above playback audio signal, Determine the average RMS (root mean square) of the playback audio signal and frequency band based on the high-frequency band and low-frequency band of the filtered playback audio signal, Determine the dB difference between the high-frequency band and the low-frequency band based on the average RMS of the high-frequency band and the average RMS of the low-frequency band, A control method of an electronic device, comprising determining a ratio of a low frequency band of the reproduced audio signal based on the dB difference.

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