CN202587132U - Voice call circuit with echo suppression function and flat panel computer - Google Patents
Voice call circuit with echo suppression function and flat panel computer Download PDFInfo
- Publication number
- CN202587132U CN202587132U CN 201220060518 CN201220060518U CN202587132U CN 202587132 U CN202587132 U CN 202587132U CN 201220060518 CN201220060518 CN 201220060518 CN 201220060518 U CN201220060518 U CN 201220060518U CN 202587132 U CN202587132 U CN 202587132U
- Authority
- CN
- China
- Prior art keywords
- echo
- chip
- microphone
- signal
- analog
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Telephone Function (AREA)
Abstract
The utility model discloses a voice call circuit with echo suppression function and a flat panel computer. A microphone and a loudspeaker are comprised. The microphone picks up a voice signal, converts the voice signal to an analog electrical signal and outputs the analog electrical signal to an analog echo cancellation chip. The analog echo cancellation chip is connected with the audio input end of the loudspeaker, carries out differential processing on the analog electrical signal acquired and output by the microphone and an audio signal transmitted to the loudspeaker, carries out outputting to a baseband chip for modulation and transmitting to a radio frequency transceiver circuit for up-conversion processing, and carries out transmitting through an antenna. According to the utility model, for a voice call hardware platform on which the flat panel computer and other mobile Internet devices are based, the echo suppression circuit is designed; in the uplink path of the voice call circuit, the hardware circuit design scheme of adding the analog echo cancellation chip is adopted to effectively suppress echo effect; the hardware cost is low, and the circuit is easily realized; and the call quality of the flat panel computer is significantly improved.
Description
Technical field
The utility model belongs to the mobile internet device technical field; Specifically, relate to a kind of voice call function and panel computer product that call voice is carried out the circuit design of echo inhibition and adopts said echo inhibition conceptual design on mobile internet device, realized.
Background technology
The IPAD that produces with Apple be the panel computer of representative as a kind of emerging electronic product, accepted by masses gradually, amusement functions such as its abundant audio-visual, recreation receive liking of vast young consumers deeply.And mobile phone be unable to do without people's daily life already as a kind of communication tool, and the voice call that it had and short message function are that present panel computer does not on the market still possess, but that its audio-visual amusement function is compared panel computer is inadequate slightly.Thereby, how panel computer and mobile phone are united two into one, make panel computer possess voice call and function of receiving and sending short message, be the research direction of each big telecommunications manufacturer always.
At present there have been indivedual manufacturers to release the panel computer that has voice call function on the market; But because the structural design and the chips such as modulation of being adopted and audio coding decoding of panel computer are different from mobile phone products; Therefore, the call function of realizing with its is a little less than extremely thin aspect the echo elimination.
And for mobile phone products; The basis that mobile phone is depended on for existence is exactly its call function; If the call function of a mobile phone is done badly; Even other functions are done to such an extent that also attend trifles and neglect essentials well again, thus the echo effect that produces in the communication process how to eliminate be the direction that each big cell phone platform manufacturer makes great efforts to capture always.So far; Had ripe echo cancellation scheme on most of mobile phones; General way is a built-in digital signal processor DSP in the inner audio codec of mobile phone; In DSP, utilize some unique echo cancellation algorithms of method operation of software programming, eliminate the echo effect that produces in the communication process with this.
But panel computer is owing to leading audio-visual amusement function, and what promptly value is the playing function of audio frequency and video, so the audio codec of its selection is used for the DSP unit that echo is eliminated inner generally can not comprising.If on panel computer, realize voice call function, the elimination of echo just becomes a design difficulty.
Summary of the invention
The purpose of the utility model is to provide a kind of echo inhibition circuit that is applicable on the mobile internet device that has voice call function at present; Suppress scheme through this echo of employing in the voice call circuit, and then eliminated the echo effect that mobile internet device produces in the voice call process.
For solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:
A kind of voice call circuit with echo inhibit feature comprises microphone and loud speaker; Export an analog echo after said microphone picks up voice signal and changes into analog electrical signal to and eliminate chip; Said analog echo is eliminated the audio input end that chip connects loud speaker; After asking difference to handle with the audio signal that transfers to loud speaker the analog electrical signal of microphone collection output; After exporting baseband chip to and modulating and transfer to RF transmit-receive circuit and carry out upconversion process, launch through antenna.
Further, said microphone comprises main microphone and ear microphone, and the voice signal that picks up through main microphone or ear microphone exports described analog echo respectively to and eliminates chip after being converted into analog electrical signal; Said analog echo is eliminated the audio input end that chip connects headset earpiece.
Preferably, said main microphone is connected same group of audio input end that analog echo is eliminated chip with ear microphone, and the audio input end of said loud speaker and headset earpiece all is connected with other one group of audio input end of analog echo elimination chip.
Further again; Said microphone connects one group of difference audio input end that analog echo is eliminated chip through a pair of differential signal line; Cross-over connection is useful on the electric capacity of eliminating differential mode noise between described differential signal line, on each signal line, is in series with one road capacitance separately.
In order to make the impedance on the differential signal line reach balance, in said differential signal line, the positive signal line connects dc offset voltage through a resistance, and the negative polarity holding wire is through another grounding through resistance, and the resistance of two resistance equates.
Further again; Said analog echo is eliminated chip and is utilized its other one group of difference audio input end to receive the audio signal that transfers to loud speaker; In described other one group of difference audio input end; The positive polarity terminal is through the audio input end of the capacitance connection loud speaker of a series connection, and negative terminal is through the capacitance ground connection of another series connection.That is, the single-ended audio signal that transfers to loud speaker is invented a pair of false differential signal and export described analog echo elimination chip to.
Further; Said analog echo is eliminated the audio signal after chip is handled through single-ended audio signal wire output, and said single-ended audio signal wire and one one end the ground connection perhaps holding wire of an end through grounding through resistance constitute a pair of differential signal line to be connected the difference audio input end of baseband chip; Cross-over connection has differential mode noise to suppress electric capacity between described differential signal line, on each signal line, is in series with one road capacitance separately.
In order to realize sound-recording function, can the analog electrical signal of output be transferred to audio codec through said microphone, convert pulse code modulation signal to through audio codec after, transfer to memory via main control chip and preserve.
As the uplink of voice, said baseband chip exports described audio codec to and carries out channel selecting after the other side's voice signal that receives through RF transmit-receive circuit is handled, and then transfers to headset earpiece or loud speaker output the other side voice.
Based on above-mentioned voice call circuit design scheme; The utility model also provides a kind of said panel computer with voice call circuit design of echo inhibit feature that adopts, and comprises main control chip, baseband chip, RF transmit-receive circuit, audio codec, memory, microphone and loud speaker; Export an analog echo after said microphone picks up voice signal and changes into analog electrical signal to and eliminate chip; Said analog echo is eliminated the audio input end that chip connects loud speaker; After asking difference to handle with the audio signal that transfers to loud speaker the analog electrical signal of microphone collection output; After exporting baseband chip to and modulating and transfer to RF transmit-receive circuit and carry out upconversion process, launch through antenna.Audio signal through voice signal that microphone is picked up and loud speaker output is eliminated at analog echo and is carried out a kind of difference of asking that is similar to subtraction in the chip and handle; Just can effectively suppress the echo that is blended in the panel computer in the ascending voice passage thus, improve communication quality.
Compared with prior art; The advantage and the good effect of the utility model are: the utility model to mobile internet device such as panel computer institute based on voice call Hardware platform design echo inhibition circuit; In the uplink of voice call circuit, adopt and set up effective inhibition that analog echo is eliminated the hardware circuit design scheme realization echo effect of chip; This compares the built-in dsp processor that mobile phone products adopts and carries out the method for designing that digital acoustic echo is eliminated; Its hardware cost is lower, the circuit realization is simpler, can significantly improve the speech quality of panel computer.
After the detailed description in conjunction with advantages the utility model execution mode, other characteristics of the utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the schematic block circuit diagram of a kind of embodiment of the voice call circuit with echo inhibit feature that proposes of the utility model;
Fig. 2 is the circuit theory diagrams that echo is suppressed a kind of embodiment of circuit.
Embodiment
Describe in detail below in conjunction with the embodiment of accompanying drawing the utility model.
In having the electronic product of call function, the main cause of echogenicity effect is embodied in following three aspects: the one, and the volume of loud speaker is bigger when hand-free call; The 2nd, the loudspeaker distance microphone is nearer; The 3rd, because the inner cavity of electronic product does not design or do not have good seal, reveal the harmony conduction thereby sound occurs.This three aspects reason all can cause being picked up by microphone through the sound that loud speaker spreads out of, and then thinks it is that useful signal sends to the side with its conversation by mistake, is in particular in: heard oneself sound with a side of this electronic product conversation, Here it is echo.
Echo in communication process, occurs, can have a strong impact on speech quality of both sides, influence user's normal use, therefore, the relevant design in having the electronic product of call function aspect the inhibition of increase echo is very important.The utility model be exactly to mobile internet device such as present panel computer based on hardware platform and a kind of voice call circuit design of proposing with echo inhibit feature.
Be example below with the panel computer, come to set forth in detail said concrete establishment structure and operation principle thereof with voice call circuit of echo inhibit feature through a concrete embodiment.
Embodiment one, and in having the panel computer product of call function, its voice call circuit is divided into uplink and downlink two parts.Wherein, uplink is after the voice that this machine user sends are picked up through microphone and are converted into analog electrical signal, to carry out analog-to-digital conversion, coding, modulation treatment successively, launches through radio circuit at last.Downlink then is after the other side's voice signal that antenna receives is passed through down-conversion, demodulation, decoding processing, is converted into the voice signal of simulation, and finally loud speaker or the earphone through this machine plays back, and realizes answering of this machine user.
Perhaps picked up by the main microphone of this machine for fear of the audio signal that spreads out of through this machine loud speaker or earphone with the external ear microphone of this machine; And then the other side is given in passback; Echogenicity, present embodiment have proposed hardware circuit design scheme as shown in Figure 1, promptly eliminate chip through in the conversation uplink of panel computer, setting up analog echo; Utilize this analog echo to eliminate the audio signal that chip receives microphone and loud speaker simultaneously; And carry out a kind of algorithm process of asking difference operation that is similar to, and then from the voice signal that microphone picks up, balance out loudspeaker signal wherein, to reach the purpose of design of eliminating echo in the ascending voice.
Carry out detailed explanation in the face of the concrete line design of said echo inhibition circuit down.
Referring to shown in Figure 1, utilize the microphone that disposes on the panel computer product to pick up voice signal, said voice signal had both comprised this machine user's voice signal, also comprised the other side's voice signal through the output of this machine loud speaker.After the voice signal that will pick up through microphone changes into analog electrical signal, at first export analog echo to and eliminate chip.Said analog echo is eliminated chip be connected with the audio input end of loud speaker simultaneously, reception needs the audio signal through loud speaker output.Utilizing said analog echo to eliminate chip asks difference to handle with the audio signal that transfers to loud speaker the analog electrical signal of microphone collection output; Promptly from the analog electrical signal of microphone output, filter out wherein the consistent audio volume control of audio signal waveform that broadcasts with loud speaker; And then this machine of restoring user's voice, export baseband chip to and carry out modulation treatment, transfer to then after RF transmit-receive circuit carries out upconversion process; Just can be transmitted to the other side through antenna, realize call function.Owing to eliminate through analog echo in the audio signal of chip output and filtered out loudspeaker signal, so the other side can not hear self voice again, thereby realized effective inhibition of echo effect, makes that speech quality is able to promote.
In the present embodiment, said microphone can be arranged on the main microphone on the panel computer body, also can be arranged on the ear microphone on the earphone.During conversation; No matter which microphone the user selects to use pick up voice signal; The voice signal that picks up through main microphone or ear microphone can transfer to analog echo and eliminate chip and carry out the echo inhibition and handle after converting analog electrical signal to via microphone.Eliminate chip for said analog echo; The audio input end that also can connect loud speaker and headset earpiece simultaneously; Receive the audio signal of broadcasting through this machine loud speaker or headset earpiece; And then with ask difference to handle through the analog electrical signal of main microphone or ear microphone output, obtain one the tunnel do not comprise echo this machine user voice signal, send to the opposing party with the conversation of this machine.
Consider that the user is when conversing; Utilize the main microphone and the loud speaker that are arranged on this machine to carry out voice call; Utilize outer ear microphone and the headset earpiece that is connected on this machine to carry out voice call, the two can not use simultaneously, therefore; Only have a microphone at received speech signal at synchronization, also have only an electro-acoustic element playing voice signal.Thus, can main microphone and ear microphone be connected on same group of audio input end of analog echo elimination chip; The audio input end of loud speaker and headset earpiece is connected on other one group of audio input end of analog echo elimination chip; And then when guaranteeing that echo effect effectively suppresses; Reached and practiced thrift the purpose of design that analog echo is eliminated the port resource of chip; Thereby make no matter the panel computer product still is in the earphone communication process, can both obtain good communication effect in the hand-free call process.
Certainly, also can main microphone and ear microphone be connected respectively to analog echo eliminates on different audio input end of chip; The audio input end of loud speaker and headset earpiece also can take one group of different audio input end that analog echo is eliminated chip separately, can reach the purpose of design that present embodiment proposes to eliminate echo equally, and present embodiment does not specifically limit this.
In order to keep the sound-recording function of panel computer; The speech simulation signal of telecommunication through microphone output is carried out the two-way expansion; The mode that promptly adopts parallel connection output is transferred to analog echo on the one hand with the analog electrical signal of microphone conversion output and eliminates chip and carry out after the echo inhibition handles; Send to the other side via uplink, realize call function; On the other hand; Be transferred to after audio codec changes into pulse code modulation PCM signal, be sent to the main control chip of panel computer, and then under the control action of main control chip; In the memory that said PCM signal is deposited into main control chip is connected, thereby realize sound-recording function.
Said sound-recording function both can be when the user converses, to start, and the dialog context of both call sides was recorded being used for; Also can carry out separately, merely carry out recording operation.As for the recording operation of adopting which kind of type; Can pass through the main control chip generation control signal corresponding of panel computer according to user's selection; Through this control signal each electronic device in the uplink is enabled control, and then respond user's recording operation exactly.
Fig. 2 is the particular circuit configurations that said echo is suppressed circuit, and present embodiment is that the differential signal form is that example describes with the speech simulation signal of telecommunication that generates through the microphone conversion.Wherein, (the microphone here can be main microphone in order to connect microphone for MIC+, MIC-; Also can be ear microphone) the audio frequency terminal, the analog electrical signal through microphone output transfers to wherein one group of sub-MIC0_P of difference audio input end, the MIC0_N that analog echo is eliminated chip N1 via a pair of differential signal line.On said differential signal line, can connect respectively one road capacitance C6, C7 are to be used for isolating out the flip-flop of the speech simulation signal of telecommunication; Also series matching resistor R3, R4 can further in each signal line, be distinguished, to realize impedance matching.All right further cross-over connection capacitor C 8 to be used for eliminating the differential mode noise of circuit, improves speech quality between said differential signal line.
For the required dc offset voltage MIC_BIAS of microphone; Can be applied on the positive signal line of said differential signal line via inductance L 1, resistance R 1; As shown in Figure 2, wherein, inductance L 1 is used for described dc offset voltage MIC_BIAS is carried out Filtering Processing with capacitor C 1, C2.In order to make the impedance on the differential signal line reach balance, present embodiment selects the resistance resistance R 2 identical with R1 to be connected between the negative polarity holding wire and ground of said differential signal line, with the electric energy on balanced differential holding wire both sides.
In order to realize sound-recording function; To transfer to differential input end MICP, the MICN of audio codec through the analog electrical signal of microphone output simultaneously via other a pair of differential signal line; At this can connect separately equally in to differential signal line one road capacitance C3, C4; And the cross-over connection differential mode noise suppresses capacitor C 5 between two signal line, to improve recording effect.
Among Fig. 2; SPK_IN is the audio input end of loud speaker; Be generally single-ended signal owing to output to the audio signal of loud speaker; And analog echo is eliminated the audio frequency receive path of chip N1 often based on the differential signal form, therefore, eliminates the signal reception requirement of chip N1 in order to satisfy analog echo; Avoid introducing common mode disturbances; Single-ended signal line and other one one end that present embodiment will connect the audio input end SPK_IN of loud speaker perhaps do not constitute a pair of differential signal line through resistance R 5 directly grounded holding wires through resistance R 5 ground connection, and then realize that with false differential mode the voice signal of eliminating chip N1 with analog echo transmits, and the other one group of sub-LINE_IN_P of difference audio input end, the LINE_IN_N that specifically are connected to analog echo elimination chip N1 are last.Can distinguish series capacitance C9, C10 at formed this equally in to differential signal line, to filter out the flip-flop in the audio signal.
Said analog echo is eliminated chip N1 and is utilized internal software that two groups of difference audio signals that receive are carried out a kind of similar poor algorithm process of asking; And then from the voice signal that microphone picks up, filter out the echo signal of wherein sneaking into; This machine of restoring user speech; The lead-out terminal LINE_OUT that eliminates chip N1 through analog echo exports baseband chip to and carries out modulation treatment, and then after carrying out upconversion process through RF transmit-receive circuit, launches through antenna.
In the present embodiment; The audio signal of eliminating chip N1 output through said analog echo is single-ended audio signal; For the differential signal that satisfies baseband chip receives requirement; Eliminate single-ended audio signal wire and other one one end ground connection or the end holding wire through grounding through resistance of the lead-out terminal LINE_OUT of chip N1 and constitute a pair of differential signal line, the sub-M_MICP of difference audio input end, the M_MICN of connection baseband chip connecting said analog echo.Formed this to false differential signal line in, can connect separately one road capacitance C11, C12, further the cross-over connection differential mode noise suppresses capacitor C 13 between two signal line, with further lifting speech quality.
For the voice downlink of panel computer, consider that panel computer itself also has the voice playing function, can play the sound source signal of preserving in its memory.Therefore, present embodiment is preferably realized the broadcast output to call voice by existing audio playing circuit in the panel computer.Its circuit design scheme is: utilize the antenna of panel computer to receive the high-frequency signal that comprises the other side's voice messaging; After exporting RF transmit-receive circuit to and carrying out down-conversion and demodulation process; Send into baseband chip and carry out corresponding signal decoding; The voice signal that obtains the PCM form exports audio codec to, and then utilizes the inner Bypass switch (switch that is equivalent to a single-pole double throw) of audio codec that the other side's voice that receive are switched to the earphone end, exports through headset earpiece; Perhaps switch to the loud speaker end,, and then realize user's answering call voice through the loud speaker output of disposing on the panel computer.
Because the voice signal through audio codec output is lower-powered analog signal, this signal will also be wanted to switch to powerful loud speaker output through low power earphone output on the one hand on the other hand.Therefore, in audio codec, need do corresponding software gain adaptation, the voice signal after adaptive drives loudspeaker plays and comes out after carrying out power amplification and handle through audio-frequency power amplifier again.
In addition; For the sound source signals of preserving in the memory such as music, the main control chip that can pass through panel computer is input in the audio codec, and this sound source signal can be the digital signal of PCM form; Convert analog signal to via audio codec; And after carrying out a series of gain and effect process, select to realize music playback function through earphone or loud speaker output.
Certainly, echo that present embodiment proposed is suppressed the circuit design mode and not only can be applied in the panel computer product, same being suitable for for other have the mobile Internet MID equipment of voice call function, and present embodiment does not specifically limit this.
Should be noted that; The above only is a kind of preferred implementation of the utility model; For those skilled in the art; Under the prerequisite that does not break away from the utility model principle, can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection range of the utility model.
Claims (10)
1. the voice call circuit with echo inhibit feature comprises microphone and loud speaker; It is characterized in that: export an analog echo after said microphone picks up voice signal and changes into analog electrical signal to and eliminate chip; Said analog echo is eliminated the audio input end that chip connects loud speaker; After asking difference to handle with the audio signal that transfers to loud speaker the analog electrical signal of microphone collection output; After exporting baseband chip to and modulating and transfer to RF transmit-receive circuit and carry out upconversion process, launch through antenna.
2. the voice call circuit with echo inhibit feature according to claim 1; It is characterized in that: said microphone comprises main microphone and ear microphone; The voice signal that picks up through main microphone or ear microphone exports described analog echo respectively to and eliminates chip after being converted into analog electrical signal; Said analog echo is eliminated the audio input end that chip connects headset earpiece.
3. the voice call circuit with echo inhibit feature according to claim 2; It is characterized in that: said main microphone is connected same group of audio input end that analog echo is eliminated chip with ear microphone, and the audio input end of said loud speaker and headset earpiece all is connected with other one group of audio input end of analog echo elimination chip.
4. the voice call circuit with echo inhibit feature according to claim 1; It is characterized in that: said microphone connects one group of difference audio input end that analog echo is eliminated chip through a pair of differential signal line; Cross-over connection is useful on the electric capacity of eliminating differential mode noise between described differential signal line, on each signal line, is in series with one road capacitance separately.
5. the voice call circuit with echo inhibit feature according to claim 4; It is characterized in that: in said differential signal line; The positive signal line connects dc offset voltage through a resistance, and the negative polarity holding wire is through another grounding through resistance, and the resistance of two resistance equates.
6. the voice call circuit with echo inhibit feature according to claim 4; It is characterized in that: said analog echo is eliminated chip and is utilized its other one group of difference audio input end to receive the audio signal that transfers to loud speaker; In described other one group of difference audio input end; The positive polarity terminal is through the audio input end of the capacitance connection loud speaker of a series connection, and negative terminal is through the capacitance ground connection of another series connection.
7. the voice call circuit with echo inhibit feature according to claim 6; It is characterized in that: said analog echo is eliminated the audio signal after chip is handled through single-ended audio signal wire output, and said single-ended audio signal wire and one one end the ground connection perhaps holding wire of an end through grounding through resistance constitute a pair of differential signal line to be connected the difference audio input end of baseband chip; Cross-over connection has differential mode noise to suppress electric capacity between described differential signal line, on each signal line, is in series with one road capacitance separately.
8. according to each described voice call circuit in the claim 1 to 7 with echo inhibit feature; It is characterized in that: said microphone transfers to audio codec with the analog electrical signal of output; After converting pulse code modulation signal to through audio codec, transfer to memory via main control chip and preserve.
9. according to each described voice call circuit in the claim 1 to 7 with echo inhibit feature; It is characterized in that: after said baseband chip is handled the other side's voice signal that receives through RF transmit-receive circuit; Export described audio codec to and carry out channel selecting, and then transfer to headset earpiece or loud speaker output the other side voice.
10. a panel computer comprises main control chip, baseband chip, RF transmit-receive circuit, audio codec and memory; It is characterized in that: also comprise like the described voice call circuit of each claim in the claim 1 to 9 with echo inhibit feature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220060518 CN202587132U (en) | 2012-02-23 | 2012-02-23 | Voice call circuit with echo suppression function and flat panel computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220060518 CN202587132U (en) | 2012-02-23 | 2012-02-23 | Voice call circuit with echo suppression function and flat panel computer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202587132U true CN202587132U (en) | 2012-12-05 |
Family
ID=47256488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220060518 Expired - Fee Related CN202587132U (en) | 2012-02-23 | 2012-02-23 | Voice call circuit with echo suppression function and flat panel computer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202587132U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104954942A (en) * | 2015-06-10 | 2015-09-30 | 百度在线网络技术（北京）有限公司 | Signal input device and method for echo cancellation |
| WO2015176224A1 (en) * | 2014-05-20 | 2015-11-26 | Lattice Semiconductor Corporation | Echo cancellation for high speed full duplex data transmissions |
| CN106454637A (en) * | 2016-12-16 | 2017-02-22 | 郑州云海信息技术有限公司 | Audio module silencing structure and method of server system |
| CN107864434A (en) * | 2017-09-30 | 2018-03-30 | 深圳市艾特智能科技有限公司 | Disappear talk-back circuit |
| CN109189234A (en) * | 2018-10-11 | 2019-01-11 | 东莞市大小电子科技有限公司 | A kind of mechanical keyboard with audio input and output function |
| CN111355835A (en) * | 2019-12-16 | 2020-06-30 | 天津七一二通信广播股份有限公司 | Echo suppression circuit in hands-free call of operation display terminal and implementation method |
| CN113316047A (en) * | 2021-04-16 | 2021-08-27 | 杭州涂鸦信息技术有限公司 | Pickup equipment |
| CN114760389A (en) * | 2022-06-16 | 2022-07-15 | 腾讯科技（深圳）有限公司 | Voice communication method and device, computer storage medium and electronic equipment |
| CN117636504A (en) * | 2023-11-28 | 2024-03-01 | 镁佳(北京)科技有限公司 | Automatic detection system for voice broadcast of automobile instrument |
-
2012
- 2012-02-23 CN CN 201220060518 patent/CN202587132U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015176224A1 (en) * | 2014-05-20 | 2015-11-26 | Lattice Semiconductor Corporation | Echo cancellation for high speed full duplex data transmissions |
| US10116428B2 (en) | 2014-05-20 | 2018-10-30 | Lattice Semiconductor Corporation | Echo cancellation for high speed full duplex data transmissions |
| CN104954942A (en) * | 2015-06-10 | 2015-09-30 | 百度在线网络技术（北京）有限公司 | Signal input device and method for echo cancellation |
| CN106454637A (en) * | 2016-12-16 | 2017-02-22 | 郑州云海信息技术有限公司 | Audio module silencing structure and method of server system |
| CN107864434A (en) * | 2017-09-30 | 2018-03-30 | 深圳市艾特智能科技有限公司 | Disappear talk-back circuit |
| CN109189234A (en) * | 2018-10-11 | 2019-01-11 | 东莞市大小电子科技有限公司 | A kind of mechanical keyboard with audio input and output function |
| CN111355835A (en) * | 2019-12-16 | 2020-06-30 | 天津七一二通信广播股份有限公司 | Echo suppression circuit in hands-free call of operation display terminal and implementation method |
| CN113316047A (en) * | 2021-04-16 | 2021-08-27 | 杭州涂鸦信息技术有限公司 | Pickup equipment |
| CN114760389A (en) * | 2022-06-16 | 2022-07-15 | 腾讯科技（深圳）有限公司 | Voice communication method and device, computer storage medium and electronic equipment |
| CN114760389B (en) * | 2022-06-16 | 2022-09-02 | 腾讯科技（深圳）有限公司 | Voice communication method and device, computer storage medium and electronic equipment |
| CN117636504A (en) * | 2023-11-28 | 2024-03-01 | 镁佳(北京)科技有限公司 | Automatic detection system for voice broadcast of automobile instrument |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202587132U (en) | Voice call circuit with echo suppression function and flat panel computer | |
| CN202602769U (en) | Conversation type electronic product with echo inhibition function | |
| CN104521247B (en) | Bluetooth headset hearing aid and anti-noise method and apparatus | |
| CN102724360B (en) | Method and device for implementation of hearing-aid function of mobile phone and hearing-aid mobile phone | |
| CN104935742B (en) | Communication terminal and the method for improving its tonequality under handset mode | |
| CN202889458U (en) | Automatic call volume regulation mobile phone based on environmental noise | |
| CN201054780Y (en) | Automatic noise reduction earphone | |
| CN104661158A (en) | Stereophone, terminal and audio signal processing method of stereophone and terminal | |
| CN102223428A (en) | Noise reducing method and mobile terminal | |
| CN101449320A (en) | Reduction of noise by the mobile communications devices in the state of non-calling | |
| CN211047222U (en) | Hearing aid system switching control circuit for Bluetooth headset and PCBA circuit board | |
| CN103634439A (en) | Noise reduction processing system | |
| CN111491228A (en) | Noise reduction earphone and control method thereof | |
| CN202583943U (en) | Audio circuit and tablet computer with voice function | |
| CN104581515B (en) | A kind of audio playing apparatus, method and mobile terminal | |
| CN106303118A (en) | Intelligent terminal realizes the method for microphone function, audio frequency playing method, equipment and system | |
| CN108012220A (en) | Audio processor | |
| CN107040832B (en) | A kind of handheld terminal formula microphone system based on Bluetooth technology | |
| CN101437183B (en) | Earplug type bone conduction receiver-transmitter | |
| CN104581467A (en) | Headset microphone, voice retrieval method applied the same and communication method | |
| CN205195930U (en) | Headset | |
| CN201199709Y (en) | Mobile communication terminal with function of removing noise | |
| CN203151729U (en) | Multifunctional earphone | |
| CN105515682B (en) | The method and system realized transmitting using earphone interface, receive ultrasonic wave | |
| CN202979266U (en) | Bluetooth session handle with long battery life |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20190223 |