Headphone system and ear-blocking effect control method

Abstract

The present invention discloses an earphone system and a method for controlling the ear-blocking effect. An earphone system includes at least one speaker, at least one feedforward microphone, and at least one feedback microphone; the feedback microphone is arranged at the sound output end of the speaker, and when the earphone is worn, the feedback microphone is located in the ear canal to collect the sound signal in the ear canal; the feedforward microphone is located on the outside of the earphone to collect the ambient sound signal. At least one feedforward microphone is arranged on the outside of the earphone of the present invention. When there is wind outside, the size of the wind energy can be identified, and the control circuit automatically adopts the signal of the feedforward microphone with smaller wind energy as the feedforward active noise reduction and ear-blocking effect elimination signal, while reducing or turning off the signal picked up by the microphone with larger wind energy. The control circuit starts the vibration sensor and the feedback microphone ear-blocking effect elimination filter to eliminate the ear-blocking effect.

Description

Technical Field

[0001] The present invention relates to the technical field of earphones, and more particularly to an earphone system and a method for controlling ear-blocking effect. Background Art

[0002] When the opening of the external auditory canal is blocked, the phenomenon of lowered bone conduction hearing thresholds is called the occlusion effect. The occlusion effect occurs because when the external auditory canal is blocked, the vibration sound generated by the external auditory canal cannot be eliminated through the external auditory canal, causing the self-sound signals such as speaking and chewing to be amplified by about 15-30dB at the eardrum. The frequency of the sound signal is mainly concentrated in the range of 100Hz-600Hz. In some special cases, the frequency of the sound signal is also concentrated in the range of 50Hz-1kHz. The frequency of this sound is related to the shape and size of the cartilage in the external auditory canal, the contact area between the blocking object and the cartilage of the ear canal after the external auditory canal is blocked, and the hardness of the material of the blocking object. When people speak, they cannot hear the external sounds in the range of 100Hz-600Hz very well because they are masked by the spontaneous sounds inside the ear canal.

[0003] Existing technologies for addressing the ear-blocking effect during sound transmission typically involve creating air holes or air tubes in the obstructing object, adjusting the acoustic impedance of the holes and tubes to mitigate the ear-blocking effect. Examples include hearing aids with air holes or tubes, and noise-canceling headphones with ventilation holes. These methods are all passive and, for headphone audio devices, creating air holes or tubes in hearing aids or headphones can negatively impact the low-frequency performance of the sound quality device, hindering bass reproduction. Summary of the Invention

[0004] The object of the present invention is to overcome the deficiencies of the prior art and to provide an earphone system and a method for controlling the ear-blocking effect.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A headphone system includes at least one speaker, at least one feedforward microphone, and at least one feedback microphone; the feedback microphone is arranged at the sound output end of the speaker, and when the headphone is worn, the feedback microphone is located in the ear canal to collect sound signals in the ear canal; the feedforward microphone is located outside the headphone to collect ambient sound signals.

[0007] A further technical solution is as follows: it also includes a control circuit; the control circuit includes a first audio processing module and a second audio processing module electrically connected to the feedforward microphone, a third audio processing module connected to the feedback microphone, and an adder electrically connected to the first audio processing module, the second audio processing module, and the third audio processing module; the adder is electrically connected to the speaker;

[0008] The first audio processing module and the second audio processing module are both used to process environmental sound signals; the third audio processing module is used to process ear canal sound signals;

[0009] The adder is used to receive the signals processed by the first audio processing module, the second audio processing module, and the third audio processing module, so as to superimpose the signals and transmit them to the speaker.

[0010] Its further technical solution is: further comprising a control circuit; the feedforward microphone comprises a feedforward microphone 1 and a feedforward microphone 2;

[0011] The control circuit includes a first audio processing module electrically connected to the feedforward microphone 1, a second audio processing module electrically connected to the feedforward microphone 2, a third audio processing module connected to the feedback microphone, and an adder electrically connected to the first audio processing module, the second audio processing module, and the third audio processing module; the adder is electrically connected to the speaker;

[0012] The feedforward microphone 1 is used to collect the ambient sound signal as a reference signal for feedforward active noise reduction;

[0013] The second feedforward microphone is used to collect ambient sound signals as reference signals for eliminating the ear blocking effect; the first audio processing module and the second audio processing module are both used to process the ambient sound signals and transmit them to the adder.

[0014] A further technical solution thereof is: further comprising a control circuit; the control circuit comprising a vibration sensor, a first audio processing module electrically connected to the feedforward microphone, a second audio processing module and an audio control module, a third audio processing module electrically connected to the vibration sensor, and an adder electrically connected to the first audio processing module, the second audio processing module and the third audio processing module;

[0015] The feedback microphone is electrically connected to the third audio processing module and the audio control module;

[0016] The vibration sensor is electrically connected to the audio control module; the vibration sensor is used to pick up the sound signal of the ear canal; the speaker is electrically connected to the adder.

[0017] A further technical solution is: the first audio processing module, the second audio processing module and the third audio processing module are controlled by an audio control module.

[0018] A further technical solution is: there are at most two feedforward microphones; the two feedforward microphones are electrically connected to the first audio processing module, the second audio processing module, and the audio control module.

[0019] A further technical solution is: the first audio processing module, the second audio processing module, and the third audio processing module all include a digital electronic switch, a filter, a gain adjustment amplifier, and a digital-to-analog converter.

[0020] A further technical solution is as follows: the audio control module includes a controller, a detector for detecting wind noise energy; the controller is used to control the first audio processing module and the second audio processing module.

[0021] A further technical solution is: the feedforward microphone is arranged at different positions outside the earphone.

[0022] A further technical solution is as follows: the earphone includes a shell and a speaker; the shell is located at the sound output end of the speaker to form a front sound cavity; and the vibration sensor is arranged in the front sound cavity.

[0023] A method for controlling ear occlusion effect, wherein at least one feedback microphone is arranged in the ear canal and collects ear canal sound signals; at least one feedforward microphone is arranged outside the earphone and collects ambient sound signals;

[0024] The ambient sound signal and the ear canal sound signal are both processed by an audio processing module of the control circuit and superimposed to form a first output signal with the same amplitude and opposite phase as the ambient sound signal. The first output signal is then transmitted to the speaker to cause the speaker to emit a sound that cancels the noise in the ear canal.

[0025] Its further technical solution is: the ambient sound signal is also processed by another audio processing module and amplified to form a second output signal with the same amplitude and phase as the ambient sound signal, and the second output signal is transmitted to the speaker to make the speaker emit the same sound as the ambient sound.

[0026] A further technical solution is to set a vibration sensor near the sound output end of the speaker of the earphone; the vibration sensor collects ear canal sound signals in the ear canal to compare with the ear canal sound signals collected by the feedback microphone.

[0027] A further technical solution is: it also includes an audio control module; the audio control module controls the audio processing module by detecting the feedforward microphone signal.

[0028] The present invention offers advantages over existing technologies: The earphones are equipped with at least one external feedforward microphone. When wind blows, the microphone can detect wind energy. A control circuit automatically uses the signal from the feedforward microphone with lower wind energy as the feedforward signal for active noise reduction and ear occlusion elimination, while simultaneously reducing or shutting off the signal picked up by the microphone with higher wind energy. The control circuit also activates the vibration sensor and the feedback microphone's ear occlusion elimination filter to eliminate the ear occlusion effect.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of sound propagation in the human ear;

[0031] Figure 2 A schematic diagram of wearing an earphone of an earphone system according to the present invention;

[0032] Figure 3 The frequency curve of the sound heard by the human ear with and without headphones;

[0033] Figure 4 This is a block diagram of a control circuit of an embodiment of a headphone system of the present invention;

[0034] Figure 5 This is a block diagram of a control circuit of an embodiment of a headphone system of the present invention;

[0035] Figure 6 This is a block diagram of a control circuit of an embodiment of a headphone system of the present invention;

[0036] Figure 7 FIG. 1 is a block diagram of a control circuit of an earphone system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0041] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature therebetween. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0043] In the description of this specification, reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0044] Figures 1 to 7 It is the accompanying drawing of the present invention.

[0045] A headphone system that reduces ear-blocking effects, such as Figure 2 As shown, the headset includes at least one speaker 111, at least one feedforward microphone 108, at least one feedback microphone 114, and at least one vibration sensor 110. At least one feedback microphone 114 is provided at the sound output end of the speaker 111, and when the headset is worn, the feedback microphone 114 is built into the ear canal; wherein, when the headset is worn, at least one feedforward microphone 108 is provided on the outside of the headset for collecting environmental signals; the vibration sensor 110 is provided at the sound output port of the headset to detect the wearing status of the headset and the ear.

[0046] like Figure 2 As shown, the earphones mentioned in the embodiment include a shell 112, a speaker 111 arranged in the shell 112, a circuit board 109, at least one feedback microphone 114, at least one feedforward microphone 108 (the present embodiment also includes a feedforward microphone 107), a battery for providing power, and the like. The sound output end of the speaker 111 is provided with a speaker diaphragm 113 and a silicone ear cap 118, wherein a front sound cavity is formed between the shell 112 and the speaker diaphragm 113. The front sound cavity is used to output sound to the speaker 111, so that the sound of the speaker 111 can gather energy in the front sound cavity. The front sound cavity transmits the sound of the speaker 111 to the inside of the ear canal through a sound outlet tube on the shell. The silicone ear cap 118 is sleeved on the outside of the sound outlet tube so that when the earphones are worn, the silicone ear cap 118 contacts the inner wall of the ear canal to prevent sound leakage.

[0047] Specifically, at least one feedback microphone 114 is placed at the front end of the speaker 111, and the feedback microphone 114 is used to collect sound signals from the front sound cavity and the inside of the ear canal. At least one vibration sensor 110 is located in the cavity formed by the speaker diaphragm 113, the earphone shell and the ear canal. At least one feedforward microphone 108 is located on the outside of the earphone, and is used to collect sound signals from the outside of the earphone. A plurality of feedforward microphones 108 can form a feedforward microphone 108 array. The circuit board 109 carries a control circuit for controlling components such as the feedforward microphone 108, the feedback microphone 114, and the vibration sensor 110.

[0048] In this embodiment, one or more feedforward microphones 108 located on the outside of the earphones collect external signals and, after digital processing, separate them into two signals. One signal is transmitted to an active noise reduction filter, generating a signal with the same amplitude and opposite phase as the external signal. This signal is emitted through a speaker 111 to cancel out noise entering the ear canal, particularly noise in the 50-600Hz range. The peak amplitude of the canceled noise is no less than 15dB, and the center frequency of the canceled noise is generally between 100Hz and 300Hz. The specific value is related to the center frequency of the wind collected by the vibration sensor 110 or the feedback microphone 114 in front of the speaker diaphragm 113. The noise reduction filter can automatically adjust based on the maximum center frequency of the signal amplitude collected by the vibration sensor 110 and the feedback microphone 114.

[0049] The other signal is transmitted to the anti-ear-blocking filter, amplified, and emitted through the speaker 111. The anti-ear-blocking filter forms an automatic filter between 50Hz and 600Hz and amplifies the signal. The signal amplitude must be at least equal to the signal amplitude of the active noise reduction cancellation signal and have an opposite phase. The center frequency of the amplified signal is correlated with the center frequency of the vibration sensor 110 or the microphone in front of the speaker diaphragm 113 and is automatically adjusted.

[0050] External signals can be collected by multiple feedforward microphones 108 (ie, a feedforward microphone 108 array), and can be arbitrarily distributed to the above-mentioned audio paths for active noise reduction processing or anti-ear blocking effect signal amplification processing.

[0051] The vibration sensor 110 is arranged inside the sound outlet tube of the earphone and close to the outlet of the sound outlet tube. After the silicone ear cap 118 of the earphone is inserted into the ear canal of the human ear, part of the silicone ear cap 118 will come into contact with the cartilage of the human ear. However, due to different people and different wearing methods, the silicone ear cap 118 has different contacts with the cartilage of the ear, and the silicone ear cap 118 may also leak into the ear canal. These situations result in different resonance frequencies of the ear canal cartilage and the software. The vibration sensor 110 is arranged at the nozzle opening to be closer to the cartilage position, which can more accurately detect different human ear cartilages and the state of the earphone being worn on the human ear. The feedback microphone 114 located in front of the diaphragm of the speaker 111 can cooperate with the vibration sensor 110 to detect the state of the earphone. The feedback microphone 114 is used to collect signals from the cavity formed by the front sound cavity and the ear canal. The vibration sensor 110 collects the vibration signal in the ear canal and feeds it back to the control circuit for active noise reduction and amplification of external specific signals.

[0052] Multiple feedforward microphones 108 are located at different positions of the earphones. When there is wind outside, the wind energy can be identified, and the control circuit automatically uses the signal collected by the feedforward microphone 108 with smaller wind energy as the signal for feedforward active noise reduction and elimination of the ear-blocking effect, and reduces or turns off the signal picked up by the microphone with larger wind energy. At the same time, the vibration sensor 110 and the feedback microphone 114 are controlled to start the ear-blocking effect elimination filter to eliminate the ear-blocking effect. The feedback noise reduction system composed of the feedback microphone 114, the speaker 111 and the circuit located in the ear canal can offset the appropriate wind noise signal entering the ear canal, thereby improving the user's experience of hearing the external ambient sound.

[0053] Specifically, Figures 1 to 3 As shown in FIG, when the ear canal 106 is not covered with headphones or is blocked, ambient sound 101 is transmitted through the ear canal 106 to the eardrum 104. Vibration signals 102 from walking, talking, or chewing are transmitted through the cartilage 103 into the ear canal 106 and propagate into the ear canal 106 in the form of sound waves. Since the ear canal 106 is not blocked by headphones, most of these sound waves are transmitted to the outside world, and the remaining sound waves 105 reach the eardrum 104. The sound waves 105 are represented by a frequency response curve, as shown in FIG. Figure 3 As shown by the straight line 115 in FIG.

[0054] When the earphone is worn, the ear canal 106 will be blocked by the silicone ear cap 118 of the earphone. Figure 2 After the ear canal 106 is blocked, the ambient sound signal 101 is transmitted to the ear canal 106. Since the ear canal 106 is blocked, a high-frequency passive attenuation sound signal is generated, as shown in FIG. Figure 3The vibration signal 102 is converted into a sound signal through the ear cartilage 103. The sound signal cannot be transmitted to the outside world because the ear canal 106 is blocked, so an amplified signal in the middle and low frequency band is formed, such as Figure 3 The curve 117A in the figure is placed in a frequency range of 50-600 Hz. The maximum frequency of the amplified signal is the peak frequency, as shown in FIG. Figure 3 The highest point 119 is related to the depth of the silicone ear cap 118 inserted into the ear canal, and further to the wearing state of the ear cap 116 and the cartilage 103 and the hardness of the ear cap 116.

[0055] Figure 3 The frequency response curves 117A and 117B in FIG. 1 are frequency domain representations of the amplified signal heard by the eardrum 104 after the ear is worn. Figure 3 The middle curve 117A) signal will mask the external signal, causing the human ear to be unable to hear the external low- and medium-frequency signals, and the sound of one's own speech will not be natural; the high- and medium-frequency ( Figure 3 The signal in the middle curve 117B) is passively attenuated, which causes the ear to be unable to clearly hear the external mid- and high-frequency sounds.

[0056] More specifically, the aforementioned feedforward microphone 108 may be multiple. In this embodiment, the feedforward microphone 108 includes a feedforward microphone 107 and a feedforward microphone 108. The feedforward microphones 107 and 108 are located on the outside of the earphones to collect environmental signals. The feedback microphone 114 is located near the sound outlet of the earphones. The earphones also include one or more speakers 111, one or more vibration sensors 110, and a circuit board 109. Figure 3 As shown in the frequency response curve 116 , when the frequency response curve 116 is consistent with the frequency response curve 115 , the human ear can hear the same sound when wearing headphones as when not wearing headphones.

[0057] exist Figure 4 In the illustrated embodiment, the control circuit includes a feedforward microphone 108, a feedback microphone 114, a speaker 111, a first audio processing module 202, a second audio processing module 203, and a third audio processing module 207. The first audio processing module 202, the second audio processing module 203, and the third audio processing module 207 each include a digital electronic switch, a filter, a gain adjustment amplifier, and a digital-to-analog converter.

[0058] After being picked up by the feedforward microphone 108, the external signal is converted into a digital signal through analog-to-digital conversion and transmitted to the first audio processing module 202 with a feedforward noise reduction filter and the audio processing module 203 with an occlusion effect elimination filter. The microphone 206 collects the sound signal inside the ear canal, and after analog-to-digital conversion, it is transmitted to the third audio processing module 207 with a feedback filter. The signal output by each audio processing module is superimposed by the signal adder 205. In actual operation, the output signal of the adder 205 is processed by a digital-to-analog converter or a power amplifier module and then transmitted to the speaker 111. The feedback microphone 206, the third audio processing module 207, the adder 205, and the speaker 204 all form a feedback loop to cancel the sound signal inside the ear canal. Since the signal that causes the occlusion effect is mainly concentrated in the low-frequency 50-600Hz frequency band, the peak value is generally 15dB-25dB.

[0059] This implementation case uses feedforward and feedback noise reduction to offset the low-frequency noise in the ear canal, and uses the ear occlusion cancellation filter to amplify the external signal to compensate for the low- and medium-frequency attenuation of the external environment caused by feedforward and feedback and the high-frequency attenuation caused by physical noise reduction. Figure 3 The curve 116 shown achieves transparent transmission of sound and eliminates the ear-blocking effect.

[0060] exist Figure 5 In one embodiment, the control circuit includes a first audio processing module 303 electrically connected to the feedforward microphone 107, a second audio processing module 304 electrically connected to the feedforward microphone 108, a third audio processing module 308 connected to the feedback microphone 114, and an adder 305 electrically connected to the first audio processing module 303, the second audio processing module 304, and the third audio processing module 308. Adder 305 is electrically connected to the speaker 111. In actual operation, the output signal of adder 305 is processed by a digital-to-analog converter or a power amplifier module before being transmitted to the speaker 111.

[0061] Two feedforward microphones, feedforward microphone 301 and feedforward microphone 302, are used to pick up external signals. The signal from feedforward microphone 302 serves as a reference signal for feedforward active noise reduction, while the signal from feedforward microphone 301 serves as a reference signal for eliminating the occlusion effect. The signals are then processed by the second audio processing module 304 and the first audio processing module 303 and transmitted to the adder 305. The feedback microphone 114 collects signals from the ear canal and transmits them to the third audio processing module 308. The third audio processing module 308 then processes the feedback signal and transmits it to the adder 305. The signals output by the first audio processing module 303, the second audio processing module 304, and the third audio processing module 308 are summed at the adder 305 and, after digital-to-analog conversion, are output to the speaker 111. Figure 5 An example is Figure 4 A supplementary embodiment of the embodiment in the embodiment, the effect of eliminating the ear blocking effect is Figure 2 The implementation cases shown are the same.

[0062] exist Figure 6 In one embodiment, the control circuit includes a vibration sensor, a first audio processing module 402, a second audio processing module 403, and an audio control module 406 connected to the feedforward microphone 108 (or feedforward microphone 107), a third audio processing module 404 electrically connected to the vibration sensor 110, and an adder electrically connected to the first audio processing module 402, the second audio processing module 403, and the third audio processing module 404. The feedback microphone 114 is electrically connected to the third audio processing module 404 and the audio control module 406. The vibration sensor 110 is electrically connected to the fourth audio processing module; the speaker 111 is electrically connected to the adder 407. In actual operation, the output signal of the adder 407 is processed by a digital-to-analog converter or a power amplifier module, and then transmitted to the speaker 111.

[0063] The first audio processing module 402, the second audio processing module 403, and the third audio processing module 404 all include digital electronic switches, filters, gain adjustment amplifiers, and digital-to-analog converters. The audio processing module 406 includes a controller and a wind noise energy detector. The wind noise detector is used to detect the wind noise energy in the signal transmitted by the microphone 401 and control the first audio processing module 402, the second audio processing module 403, and the third audio processing module 404 through the controller.

[0064] Furthermore, the combination of the feedback microphone 114 and the vibration sensor 110 can more stably identify the amplitude, center frequency and frequency range of the signal in the ear canal. The feedback microphone 114 picks up the signal in the ear canal and compares it with the signal picked up by the vibration sensor 110 to detect the wearing mode of the earphone, such as whether there is leakage in the earphone and the amount of leakage. The audio control module 406 controls the first audio processing module 402 and the third audio processing module 404 to adjust the filter according to different human ears and different earphone wearing states. The first audio processing module 402 cooperates with the feedforward microphone 401, and the third audio processing module 404 cooperates with the feedback microphone 114 to eliminate the sound inside the ear canal due to different human ears and different wearing states, especially the sound signal of people talking to themselves, under the instruction of the audio control module 406.

[0065] The audio control module 406 coordinates the signals collected by the feedforward microphone 401 and the feedback microphone 114 and controls the second audio processing module 403 to amplify the signal from the feedforward microphone 401. The second audio processing module 403 amplifies the external sound and transmits it to the ear canal. The amplified sound signal is at least 10 dB greater than the signal within the ear canal. The audio control module 406 compares the external sound signal with the sound signal within the ear canal, and then determines a comparison value. Based on this comparison value, the audio control module 406 determines whether to control the second audio processing module 403. If control is required, the second audio processing module 403 amplifies the sound signal collected by the feedforward microphone 401.

[0066] All signals processed by the audio processing module are superimposed by the adder 407 and transmitted to the speaker 111 after signal amplification and digital-to-analog conversion, so that the signal heard in the ear canal is consistent with the external signal, while eliminating the ear blocking effect. Figure 3 Curve 116 is shown.

[0067] Furthermore, when there is strong wind outside, the audio control module 406 detects a large wind noise signal through the signal transmitted by the feedforward microphone 401. The audio control module 406 controls the third audio processing module 404, and cooperates with the signal collected by the vibration sensor 110 and the signal collected by the feedback microphone 114, and eliminates the signal generated by the self-sounding sound 102 in the ear canal for different people and different wearing conditions to eliminate the ear blocking effect.

[0068] When the audio control module 406 detects a large wind noise signal, it controls the first audio processing module 402 to reduce the path gain or close the path, controls the second audio processing module 403 to reduce the path gain, and adjusts the path filter to reduce low-frequency signals, especially wind noise signals, from entering the speaker 111.

[0069] All signals processed by the audio processing module are superimposed by the adder 407 and amplified, and then transmitted to the speaker 111 after digital-to-analog conversion, so that the signal heard in the ear canal is consistent with the external signal, achieving sound transmission and eliminating the ear blocking effect.

[0070] exist Figure 7In one embodiment, the control circuit includes a feedforward microphone 107, a feedforward microphone 108, a feedback microphone 114, a speaker 111, a vibration sensor 110, a first audio processing module 504, a second audio processing module 505, a third audio processing module 506, an audio control module 507, and an adder 508. The adder 508 is electrically connected to the speaker 111. In actual operation, the output signal of the adder 407 is processed by a digital-to-analog converter or a power amplifier module and then transmitted to the speaker 111.

[0071] The first audio processing module 504, the second audio processing module 505, and the third audio processing module 506 include digital electronic switches, filters, and gain adjustment amplifiers. The audio control module 507 includes a controller and a wind noise energy detector. The wind noise detector is used to detect the wind noise energy in the signals sent by the feedforward microphones 107 and 108, and controls the first audio processing module 504, the second audio processing module 505, and the third audio processing module 506 through the controller.

[0072] The combination of feedback microphone 114 and vibration sensor 110 can further reliably identify the amplitude, center frequency, and frequency range of the ear canal signal. Feedback microphone 114 detects the signal in the ear canal and compares it with the signal picked up by vibration sensor 110 to detect the headphone wearing mode, such as whether the headphone has leakage and the amount of leakage. Figure 7 The embodiment described is for Figure 6 A supplement to the embodiment. Figure 6 The embodiment differs in that Figure 7 In the embodiment, there are multiple feedforward microphones, such as the two feedforward microphones 107 and 108 in this embodiment. These multiple feedforward microphones are typically located in different locations on headphones or similar audio equipment. The feedforward microphones in different locations can receive different wind noise energies. The audio control module 507 discriminates the signals from the feedforward microphones 107 and 108 to control the first audio processing module 504 and the second audio processing module 505 to perform feedforward active noise reduction and signal amplification, respectively, or to interchange functions between the two, thereby achieving sound transmission in strong winds.

[0073] The above-mentioned earphone system implements the following method for controlling the ear-blocking effect:

[0074] At least one feedback microphone 114 is disposed in the ear canal and collects ear canal sound signals from the ear canal; at least one feedforward microphone 108 or 107 is disposed outside the earphone and collects ambient sound signals;

[0075] The ambient sound signal and the ear canal sound signal are both processed by an audio processing module of the control circuit and superimposed to form a first output signal with the same amplitude and opposite phase as the ambient sound signal. The first output signal is then transmitted to the speaker 111 so that the speaker 111 emits a sound that cancels the noise in the ear canal.

[0076] The ambient sound signal is also processed by another audio processing module and amplified to form a second output signal with the same amplitude and phase as the ambient sound signal, and the second output signal is transmitted to the speaker 111 so that the speaker 111 emits the same sound as the ambient sound.

[0077] A vibration sensor 110 is provided near the sound output end of the speaker 111 of the earphone; the vibration sensor 110 collects ear canal sound signals in the ear canal to compare with the ear canal sound signals collected by the feedback microphone 114 .

[0078] An audio control module is also included; the audio control module controls the audio processing module by detecting the feedforward microphone 108 signal.

[0079] Compared to the prior art, the earphones described herein are equipped with at least one external feedforward microphone. When wind blows, the microphone can detect the amount of wind energy. The control circuit automatically uses the signal from the feedforward microphone with lower wind energy as the feedforward signal for active noise reduction and eliminating the ear-blocking effect, while simultaneously reducing or shutting off the signal picked up by the microphone with higher wind energy. The control circuit activates the vibration sensor and the feedback microphone's filter to eliminate the ear-blocking effect. The feedback noise reduction system, consisting of the feedback microphone, speaker, and circuit located in the ear canal, can offset appropriate wind noise signals entering the ear canal.

[0080] The above examples are merely provided to further illustrate the technical content of the present invention for easier understanding by the reader, but do not limit the implementation of the present invention to these examples. Any extension or re-creation of the technology based on the present invention shall be protected by the present invention. The scope of protection of the present invention shall be determined by the claims.

Claims

1. A headphone system, characterized in that: including at least one speaker, at least one feedforward microphone, and at least one feedback microphone; The feedback microphone is arranged at the sound output end of the speaker, and when the earphone is worn, the feedback microphone is located in the ear canal to collect the sound signal in the ear canal; a vibration sensor is arranged near the sound output end of the speaker of the earphone; The vibration sensor collects the ear canal sound signal in the ear canal to compare with the ear canal sound signal collected by the feedback microphone; The feedforward microphone is located outside the earphone to collect ambient sound signals; The feedforward microphone includes a feedforward microphone 1 and a feedforward microphone 2; The feedforward microphone 1 is used to collect the ambient sound signal as a reference signal for feedforward active noise reduction; The second feedforward microphone is used to collect ambient sound signals as reference signals for eliminating the ear blocking effect.

2. The earphone system according to claim 1, wherein: The system further includes a control circuit; the control circuit includes a first audio processing module and a second audio processing module electrically connected to the feedforward microphone, a third audio processing module connected to the feedback microphone, and an adder electrically connected to the first audio processing module, the second audio processing module, and the third audio processing module; the adder is electrically connected to the speaker; The first audio processing module and the second audio processing module are both used to process environmental sound signals; the third audio processing module is used to process ear canal sound signals; The adder is used to receive the signals processed by the first audio processing module, the second audio processing module, and the third audio processing module, so as to superimpose the signals and transmit them to the speaker.

3. The earphone system according to claim 1, wherein: Also includes a control circuit; The control circuit includes a first audio processing module electrically connected to the feedforward microphone 1, a second audio processing module electrically connected to the feedforward microphone 2, a third audio processing module connected to the feedback microphone, and an adder electrically connected to the first audio processing module, the second audio processing module, and the third audio processing module; the adder is electrically connected to the speaker; The first audio processing module and the second audio processing module are both used to process the ambient sound signal and transmit the signal to the adder.

4. The earphone system according to claim 1, wherein: Also includes a control circuit; The control circuit includes a vibration sensor, a first audio processing module electrically connected to the feedforward microphone, a second audio processing module and an audio control module, a third audio processing module electrically connected to the vibration sensor, and an adder electrically connected to the first audio processing module, the second audio processing module and the third audio processing module; The feedback microphone is electrically connected to the third audio processing module and the audio control module; The vibration sensor is electrically connected to the audio control module; the vibration sensor is used to pick up sound signals from the ear canal; The speaker is electrically connected to the adder.

5. The earphone system according to claim 4, characterized in that: The first audio processing module, the second audio processing module and the third audio processing module are controlled by an audio control module.

6. The earphone system according to claim 4, characterized in that: There are at most two feedforward microphones; both feedforward microphones are electrically connected to the first audio processing module, the second audio processing module, and the audio control module.

7. The earphone system according to any one of claims 2 to 4, characterized in that: The first audio processing module, the second audio processing module, and the third audio processing module all include a digital electronic switch, a filter, a gain adjustment amplifier, and a digital-to-analog converter.

8. The earphone system according to claim 4, characterized in that: The audio control module includes a controller and a detector for detecting wind noise energy; the controller is used to control the first audio processing module and the second audio processing module.

9. The earphone system according to claim 1, wherein: The feedforward microphones are arranged at different positions outside the earphones.

10. The earphone system according to claim 4, characterized in that: The earphone comprises a shell and a speaker; the shell is located at the sound output end of the speaker to form a front sound cavity; the vibration sensor is arranged in the front sound cavity.

11. A method for controlling ear blocking effect, characterized in that: At least one feedback microphone is disposed in the ear canal and collects ear canal sound signals from the ear canal; at least one feedforward microphone is disposed outside the earphone and collects ambient sound signals; a vibration sensor is disposed near the speaker output end of the earphone; the vibration sensor collects ear canal sound signals from the ear canal for comparison with the ear canal sound signals collected by the feedback microphone; The ambient sound signal and the ear canal sound signal are processed by an audio processing module of the control circuit and superimposed to form a first output signal having the same amplitude and opposite phase as the ambient sound signal. The first output signal is then transmitted to the speaker to cause the speaker to emit a sound that cancels the noise in the ear canal. The feedforward microphone includes a feedforward microphone 1 and a feedforward microphone 2; The feedforward microphone 1 is used to collect the ambient sound signal as a reference signal for feedforward active noise reduction; The second feedforward microphone is used to collect ambient sound signals as reference signals for eliminating the ear blocking effect.

12. The method for controlling ear blocking effect according to claim 11, characterized in that: The ambient sound signal is also processed by another audio processing module and amplified to form a second output signal with the same amplitude and phase as the ambient sound signal, and the second output signal is transmitted to the speaker so that the speaker emits the same sound as the ambient sound.

13. The method for controlling ear occlusion effect according to claim 11, further comprising an audio control module; the audio control module controls the audio processing module by detecting the feedforward microphone signal.

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