CN113676816A - Echo eliminating method for bone conduction earphone and bone conduction earphone - Google Patents
Echo eliminating method for bone conduction earphone and bone conduction earphone Download PDFInfo
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- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 19
- 239000013589 supplement Substances 0.000 claims abstract description 5
- 101150001495 SPL10 gene Proteins 0.000 claims abstract description 4
- 230000003321 amplification Effects 0.000 claims description 22
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 22
- 230000005236 sound signal Effects 0.000 claims description 21
- 230000030279 gene silencing Effects 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000010408 sweeping Methods 0.000 claims description 6
- 101150042817 NFS1 gene Proteins 0.000 claims description 3
- 101100126298 Rickettsia conorii (strain ATCC VR-613 / Malish 7) iscS gene Proteins 0.000 claims description 3
- 101150114492 SPL1 gene Proteins 0.000 claims description 3
- 101150056353 SPL2 gene Proteins 0.000 claims description 3
- 210000003128 head Anatomy 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 210000000860 cochlear nerve Anatomy 0.000 description 2
- 210000003027 ear inner Anatomy 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 210000002985 organ of corti Anatomy 0.000 description 1
- 210000003625 skull Anatomy 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1016—Earpieces of the intra-aural type
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R11/00—Transducers of moving-armature or moving-core type
- H04R11/02—Loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R11/00—Transducers of moving-armature or moving-core type
- H04R11/04—Microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/13—Hearing devices using bone conduction transducers
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
The invention relates to an echo eliminating method for a bone conduction earphone, which comprises the following steps: respectively arranging a main microphone and an auxiliary microphone at different positions on the bone conduction earphone; white noise is input to the main microphone just opposite to the main microphone, and a pickup frequency response curve SPL10 of the main microphone is obtained; white noise is input to the auxiliary microphone, and a pickup frequency response curve SPL20 of the auxiliary microphone is obtained; calculating a frequency response difference curve SPL _ NC of the main microphone and the auxiliary microphone, wherein the SPL _ NC is SPL10-SPL 20; setting a bone conduction earphone human head model, and outputting a sweep frequency signal of a fixed level B through an audio generator; obtaining the frequency response curve SPL of the main microphone aiming at the sweep frequency signal10‑1And auxiliary microphone aiming atFrequency response curve SPL of frequency sweep signal20‑1(ii) a Computing the echo noise SPL _ NC1, SPL _ NC 1-SPL for bone conduction headphones10‑1‑(SPL20‑1+ sweep SPLSupplement 1+SPLComplement each other) (ii) a The muting signal SPL _ Mic is calculated, SPL _ Mic being SPL10-SPL _ NC 1. The echo eliminating method for the bone conduction earphone and the bone conduction earphone improve the communication quality by carrying out echo eliminating processing on the bone conduction earphone.
Description
Technical Field
The invention relates to the technical field of electronic equipment, in particular to an echo eliminating method for a bone conduction earphone and the bone conduction earphone.
Background
Bone conduction is a sound conduction mode, that is, sound is converted into mechanical vibration with different frequencies, and sound waves are transmitted through the skull, the bone labyrinth, the lymph fluid of the inner ear, the spiral organ and the auditory center of a human body.
The bone conduction technology is divided into a bone conduction speaker technology and a bone conduction microphone technology:
(1) bone conduction speaker technology is used for speech, i.e. listening to sound. The conventional air conduction speaker converts an electric signal into a sound wave (vibration signal) to be transmitted to an auditory nerve. The bone conduction speaker transmits sound waves (vibration signals) converted from the electric signals directly to the auditory nerve through the bone. The transmission media of the sound waves (vibration signals) are different between the two.
(2) Bone conduction microphone technology is used for receiving, i.e. collecting, sound. Air conduction is the transmission of sound waves through the air to the microphone, while bone conduction is the transmission directly through the bone. The transmission medium of the sound waves (vibration signals) is different between the two.
In order to achieve a better call sound reception effect, the bone conduction headset mostly arranges a microphone near the left/right generating unit, i.e. the microphone is closer to the mouth of a person. That is, the existing bone conduction headset usually has the microphone and the sound generating unit disposed in the same cavity.
However, the sound generating unit used in the bone conduction headset is a moving-iron unit. Compared with the moving coil unit adopted by the traditional air conduction earphone, the power of the moving iron unit used for bone conduction is larger. Due to the particularity of the bone conduction sounding unit, small-amplitude vibration generated by the sounding unit is transmitted to the microphone at the same time, so that the opposite party of the call can hear the own voice; that is, the existing bone conduction headset has echo noise, thereby affecting the call quality.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an echo eliminating method for a bone conduction earphone and the bone conduction earphone.
The purpose of the invention is realized by the following technical scheme:
an echo cancellation method for a bone conduction headset, comprising the steps of:
step 1, respectively arranging a main microphone and an auxiliary microphone at different positions on a bone conduction earphone;
step 2, inputting white noise with a fixed level A to the main microphone to obtain a pickup frequency response curve SPL10 of the main microphone;
inputting white noise with a fixed level A to the auxiliary microphone to obtain a pickup frequency response curve SPL20 of the auxiliary microphone;
step 3, calculating a frequency response difference curve SPL _ NC of the main microphone and the auxiliary microphone, wherein the SPL _ NC is SPL10-SPL 20;
step 4, setting a bone conduction earphone human head model, and outputting a sweep frequency signal of a fixed level B through an audio generator;
step 5, obtaining a frequency response curve SPL of the main microphone aiming at the frequency sweeping signal10-1And the frequency response curve SPL of the auxiliary microphone for the frequency sweep signal20-1；
Step 6, calculating echo noise SPL _ NC1 of bone conduction earphone, SPL _ NC1 being SPL10-1-(SPL20-1+ sweep SPLSupplement 1+SPLComplement each other)；
And 7, calculating the silencing signal SPL _ Mic which is SPL10-SPL _ NC 1.
Preferably, the echo cancellation method for the bone conduction headset further repeats the steps 1 to 6 n times, and adjusts the level of the white noise and the level of the sweep frequency signal when repeating the steps 1 to 6 each time, so as to obtain echo noises SPL _ NC1, SPL _ NC2, and SPL _ NC3 … … SPL _ NCn;
calculating the average echo noise SPL _ ENC:
SPL_ENC＝(SPL_NC1+SPL_NC2+SPL_NC3+……+SPL_NCn)/n；
calculating the mute signal SPL _ Mic:
SPL_Mic＝SPL10-SPL_EN。
preferably, the echo cancellation method for a bone conduction headset further includes the following steps:
the silencing signal SPL _ Mic is input to a Bluetooth main chip of the bone conduction headset, and the Bluetooth main chip transmits the silencing signal SPL _ Mic to the mobile terminal.
Preferably, the pickup frequency response curve SPL1 of the main microphone is acquired from the main amplification output end of the main microphone.
Preferably, the pickup frequency response curve SPL2 of the auxiliary microphone is acquired from the auxiliary amplification output end of the auxiliary microphone.
Preferably, the step of setting the bone conduction headset human head model and outputting the frequency sweep signal through the audio generator specifically includes:
and wearing the bone conduction earphone on the human head model, and outputting a frequency sweeping signal at the human mouth position of the human head model.
Preferably, the frequency sweep signal is 20Hz-4 kHz.
The invention also discloses a bone conduction earphone, comprising: the earphone comprises an earphone body, and a main microphone, an auxiliary microphone and a transmission processing module which are respectively arranged in the earphone body;
the transmission processing module comprises a main amplifying unit, an auxiliary amplifying unit, a processing unit, a storage unit and a Bluetooth communication unit;
the main amplification unit amplifies the audio signal acquired by the main microphone and transmits the amplified audio signal to the processing unit;
the auxiliary amplification unit amplifies the audio signal acquired by the auxiliary microphone and transmits the amplified audio signal to the processing unit;
the processing unit calculates echo noise according to the audio signal input by the main amplification unit and the audio signal input by the auxiliary amplification unit and stores the echo noise in the storage unit;
the processing unit is also used for calculating to obtain a silencing signal according to the audio signal input by the main amplification unit and the echo noise and transmitting the silencing signal to the Bluetooth communication unit;
and the Bluetooth communication unit transmits the silencing signal to the mobile terminal matched with the Bluetooth communication unit.
The echo eliminating method for the bone conduction earphone and the bone conduction earphone improve the communication quality by carrying out echo eliminating processing on the bone conduction earphone.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flow chart of an echo cancellation method for a bone conduction headset according to the present invention;
fig. 2 is a schematic diagram of the bone conduction headset and the mobile terminal according to the present invention;
fig. 3 is a functional block diagram of the bone conduction headset shown in fig. 2;
fig. 4 is a schematic structural diagram (one) of a bone conduction headset according to the present invention;
fig. 5 is a schematic structural diagram (two) of the bone conduction headset of the present invention;
fig. 6 is a partial schematic view of a bone conduction headset of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
An echo cancellation method for a bone conduction headset, comprising the steps of:
step 1, respectively arranging a main microphone and an auxiliary microphone at different positions on a bone conduction earphone. The main microphone and the auxiliary microphone are arranged at different angles and positions, so that certain phase difference exists between voice signals received by the main microphone and the auxiliary microphone when the main microphone and the auxiliary microphone receive call voice.
And 2, inputting white noise with a fixed level A to the main microphone to obtain a pickup frequency response curve SPL10 of the main microphone. And the number of the first and second electrodes,
white noise of a fixed level A is input to the auxiliary microphone, and a pickup frequency response curve SPL20 of the auxiliary microphone is obtained.
And 3, calculating a frequency response difference curve SPL _ NC of the main microphone and the auxiliary microphone, wherein the SPL _ NC is SPL10-SPL 20. The frequency response difference curve SPL _ NC reflects the difference in frequency response reflected by the difference in the structure of the main microphone and the sub microphone themselves.
And 4, setting the bone conduction earphone human head model, and outputting a sweep frequency signal of a fixed level B through the audio generator. In this embodiment, the frequency sweep signal is 20Hz-4 kHz.
Step 5, obtaining a frequency response curve SPL of the main microphone aiming at the frequency sweeping signal10-1And the frequency response curve SPL of the auxiliary microphone for the frequency sweep signal20-1. Outputting frequency sweep signal from the position of human mouth during communication, frequency width of the frequency sweep signalThe voice frequency range when the person speaks is included, and therefore frequency response curves corresponding to the main microphone and the auxiliary microphone respectively when the mouth of the person speaks during communication are obtained.
Step 6, calculating echo noise SPL _ NC1 of bone conduction earphone, SPL _ NC1 being SPL10-1-(SPL20-1+ sweep SPLSupplement 1+SPLComplement each other). Frequency response curve SPL for swept frequency signals by a primary microphone10-1Auxiliary microphone frequency response curve SPL for sweep frequency signal20-1SPL frequency sweepSupplement 1And SPLComplement each otherThe echo noise SPL _ NC1 of the bone conduction headset is calculated.
And 7, calculating the silencing signal SPL _ Mic which is SPL10-SPL _ NC 1. After the echo noise SPL _ NC1 of the bone conduction earphone is obtained, the echo noise SPL _ NC1 is stored in the storage unit of the bone conduction earphone. When the communication is actually carried out, the echo noise SPL _ NC1 is subtracted from the voice signal acquired in real time, so that a silencing signal is obtained, and then the silencing signal is transmitted to the other party of the communication through the mobile terminal.
In a preferred embodiment, the steps 1 to 6 are repeated n times, and the level of white noise and the level of the sweep signal are adjusted each time the steps 1 to 6 are repeated, thereby obtaining echo noises SPL _ NC1, SPL _ NC2, and SPL _ NC3 … … SPL _ NCn. Calculating the average echo noise SPL _ ENC:
SPL_ENC＝(SPL_NC1+SPL_NC2+SPL_NC3+……+SPL_NCn)/n。
calculating the mute signal SPL _ Mic:
SPL_Mic＝SPL10-SPL_EN。
after the average echo noise SPL _ ENC of the bone conduction earphone is obtained, the average echo noise SPL _ ENC is stored in a storage unit of the bone conduction earphone. During actual communication, the average echo noise SPL _ ENC is subtracted from the voice signal acquired in real time, so that a silencing signal is obtained, and then the silencing signal is transmitted to the other party of the communication through the mobile terminal.
In this embodiment, the echo cancellation method for the bone conduction headset further includes the following steps:
the silencing signal SPL _ Mic is input to a Bluetooth main chip of the bone conduction headset, and the Bluetooth main chip transmits the silencing signal SPL _ Mic to the mobile terminal.
In the present embodiment, the sound pickup frequency response curve SPL1 of the main microphone is acquired from the main amplification output terminal of the main microphone.
In the present embodiment, the sound pickup frequency response curve SPL2 of the auxiliary microphone is acquired from the auxiliary amplification output terminal of the auxiliary microphone.
In this embodiment, the step of setting the bone conduction headset human head model and outputting the frequency sweep signal through the audio generator specifically includes: and wearing the bone conduction earphone on the human head model, and outputting a frequency sweeping signal at the human mouth position of the human head model.
The present invention also discloses a bone conduction headset 10, comprising: the earphone comprises an earphone body 100, and a main microphone 200, an auxiliary microphone 300 and a transmission processing module 400 which are respectively arranged in the earphone body. The transmission processing module includes: a main amplification unit 410, an auxiliary amplification unit 420, a processing unit 430, a storage unit 440, and a bluetooth communication unit 450. The main amplification unit 410 amplifies the audio signal acquired by the main microphone 200 and transmits the amplified audio signal to the processing unit 430. The auxiliary amplification unit 420 amplifies the audio signal acquired by the auxiliary microphone 300 and transmits the amplified audio signal to the processing unit 430. The processing unit 430 calculates echo noise from the audio signal input from the main amplification unit 410 and the audio signal input from the auxiliary amplification unit 420, and stores the echo noise in the storage unit 440. The processing unit 430 further calculates a mute signal according to the audio signal and the echo noise input by the main amplifying unit 410, and transmits the mute signal to the bluetooth communication unit 450. The bluetooth communication unit 450 transmits the mute signal to the mobile terminal 500 matched thereto.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. An echo cancellation method for a bone conduction headset, comprising the steps of:
step 1, respectively arranging a main microphone and an auxiliary microphone at different positions on a bone conduction earphone;
step 2, inputting white noise with a fixed level A to the main microphone to obtain a pickup frequency response curve SPL10 of the main microphone;
inputting white noise with a fixed level A to the auxiliary microphone to obtain a pickup frequency response curve SPL20 of the auxiliary microphone;
step 3, calculating a frequency response difference curve SPL _ NC of the main microphone and the auxiliary microphone, wherein the SPL _ NC is SPL10-SPL 20;
step 4, setting a bone conduction earphone human head model, and outputting a sweep frequency signal of a fixed level B through an audio generator;
step 5, obtaining a frequency response curve SPL of the main microphone aiming at the frequency sweeping signal10-1And the frequency response curve SPL of the auxiliary microphone for the frequency sweep signal20-1；
Step 6, calculating echo noise SPL _ NC1 of bone conduction earphone, SPL _ NC1 being SPL10-1-(SPL20-1+ sweep SPLSupplement 1+SPLComplement each other)；
And 7, calculating the silencing signal SPL _ Mic which is SPL10-SPL _ NC 1.
2. The echo cancellation method for a bone conduction headset according to claim 1,
repeating the step 1 to the step 6 n times, and adjusting the level of the white noise and the level of the sweep frequency signal when the step 1 to the step 6 are repeated each time to obtain echo noises SPL _ NC1, SPL _ NC2 and SPL _ NC3 … … SPL _ NCn;
calculating the average echo noise SPL _ ENC:
SPL_ENC＝(SPL_NC1+SPL_NC2+SPL_NC3+……+SPL_NCn)/n；
calculating the mute signal SPL _ Mic:
SPL_Mic＝SPL10-SPL_EN。
3. the echo cancellation method for a bone conduction headset according to claim 1 or 2, further comprising the steps of:
the silencing signal SPL _ Mic is input to a Bluetooth main chip of the bone conduction headset, and the Bluetooth main chip transmits the silencing signal SPL _ Mic to the mobile terminal.
4. The echo cancellation method for a bone conduction headset according to claim 3, wherein the sound pickup frequency response curve SPL1 of the main microphone is obtained from a main amplification output terminal of the main microphone.
5. The echo cancellation method for a bone conduction headset according to claim 4, wherein a pickup frequency response curve SPL2 of the secondary microphone is obtained from a secondary amplification output terminal of the secondary microphone.
6. The echo cancellation method for a bone conduction headset according to claim 1, wherein the step of setting a human head model of the bone conduction headset and outputting a frequency sweep signal through an audio generator specifically comprises:
and wearing the bone conduction earphone on the human head model, and outputting a frequency sweeping signal at the human mouth position of the human head model.
7. The method of claim 1, wherein the frequency sweep signal is 20Hz-4 kHz.
8. Bone conduction headset characterized in that includes: the earphone comprises an earphone body, and a main microphone, an auxiliary microphone and a transmission processing module which are respectively arranged in the earphone body;
the transmission processing module comprises a main amplifying unit, an auxiliary amplifying unit, a processing unit, a storage unit and a Bluetooth communication unit;
the main amplification unit amplifies the audio signal acquired by the main microphone and transmits the amplified audio signal to the processing unit;
the auxiliary amplification unit amplifies the audio signal acquired by the auxiliary microphone and transmits the amplified audio signal to the processing unit;
the processing unit calculates echo noise according to the audio signal input by the main amplification unit and the audio signal input by the auxiliary amplification unit and stores the echo noise in the storage unit;
the processing unit is also used for calculating to obtain a silencing signal according to the audio signal input by the main amplification unit and the echo noise and transmitting the silencing signal to the Bluetooth communication unit;
and the Bluetooth communication unit transmits the silencing signal to the mobile terminal matched with the Bluetooth communication unit.
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| CN116723437A (en) * | 2023-08-08 | 2023-09-08 | 深圳市鑫正宇科技有限公司 | Echo cancellation method for bone conduction earphone |
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