CN216414578U - Echo cancellation circuit based on discrete component and audio equipment - Google Patents
Echo cancellation circuit based on discrete component and audio equipment Download PDFInfo
- Publication number
- CN216414578U CN216414578U CN202122386041.7U CN202122386041U CN216414578U CN 216414578 U CN216414578 U CN 216414578U CN 202122386041 U CN202122386041 U CN 202122386041U CN 216414578 U CN216414578 U CN 216414578U
- Authority
- CN
- China
- Prior art keywords
- echo cancellation
- resistor
- loudspeaker
- sound
- capacitor
- 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.)
- Active
Links
Images
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Telephone Function (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The utility model discloses an echo cancellation circuit and audio equipment based on discrete components, wherein the echo cancellation circuit comprises: the microphone module is used for collecting sound signals; a speaker for outputting a play signal; the echo cancellation module is respectively connected with the anode and the cathode of the loudspeaker through two filter circuits and is used for acquiring play signals output by the anode and the cathode of the loudspeaker and respectively filtering and frequency-selecting the play signals of the anode and the cathode through different filter circuits; and the coder-decoder is used for carrying out audio comparison on the positive and negative signals after frequency selection and the sound signals acquired by the microphone module so as to carry out echo cancellation on the sound signals and realize squelch processing. The utility model collects the sound of the loudspeaker as the squelch reference through the discrete component circuit, and distinguishes the sound of the loudspeaker from the sound of the speaking of a person by utilizing the coder-decoder and realizes the effect of echo cancellation, thereby solving the problem of acoustic echo cancellation of the intelligent sound box which needs to perform the man-machine interaction function.
Description
Technical Field
The present invention relates to the field of audio devices, and in particular, to an echo cancellation circuit based on discrete components and an audio device.
Background
At present, Acoustic Echo is caused by multiple feedback of speaker sound to microphone in hands-free or conference application, and there are generally two methods for designing Acoustic Echo Cancellation (AEC) for conference/system enclosures:
the first method is to turn off the local microphone when receiving the far-end sound signal, and the operation of turning off the local microphone may require human operation, so that the call may be cut off;
the second method is to automatically suppress the microphone audio when the far-end sound signal is received, and the suppression of the microphone audio also causes the call to be cut off, and also causes the explosion of echo if the microphone audio is detected incorrectly.
The two echo cancellation methods need to turn off or suppress the microphone audio frequency, so that the sound of the instruction sent by the user cannot be collected when the human-computer interaction is needed, and therefore, the echo cancellation method is difficult to realize on an intelligent sound box capable of realizing the human-computer interaction function.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, an object of the present invention is to provide an echo cancellation circuit based on discrete components, which can solve the problem of acoustic echo cancellation faced by an intelligent sound box that needs to perform a human-computer interaction function.
It is another object of the present invention to provide an audio device using the above-mentioned discrete component-based echo cancellation circuit.
One of the purposes of the utility model is realized by adopting the following technical scheme:
a discrete component based echo cancellation circuit comprising:
the microphone module is used for collecting sound signals;
a speaker for outputting a play signal;
the echo cancellation module is respectively connected with the anode and the cathode of the loudspeaker through two filter circuits and is used for acquiring play signals output by the anode and the cathode of the loudspeaker and respectively filtering and frequency-selecting the play signals of the anode and the cathode through different filter circuits;
and the coder-decoder is used for carrying out audio comparison on the positive and negative signals after frequency selection and the sound signals acquired by the microphone module so as to carry out echo cancellation on the sound signals and realize squelch processing.
Further, still include:
and the signal input end of the power amplifier module is connected with the coder-decoder, and the signal output end of the power amplifier module is connected with the loudspeaker and used for playing the signal subjected to squelch processing by the loudspeaker after passing through the power amplifier module.
Further, still include:
and the processor module is connected with the coder-decoder and used for generating a corresponding sound source signal by taking the signal subjected to the squelch processing as an interactive instruction and playing the sound source signal by the loudspeaker after passing through the coder-decoder and the power amplifier module.
Furthermore, the playing signal output by the positive electrode of the loudspeaker is filtered and frequency-selected through a first filter circuit, the first filter circuit comprises an RC filter consisting of a resistor R20, a resistor R28, a capacitor C55 and a capacitor C11, and the resistor R20 is connected with a resistor R28 and a capacitor C55 which are connected in parallel and then grounded; the resistor R20 is connected with the capacitor C11 and then output to the codec.
Further, the first filter circuit collects a playing signal output by the anode of the loudspeaker through a resistor R12 of 0R.
Furthermore, the playing signal output by the cathode of the speaker is filtered and frequency-selected through a second filter circuit, the second filter circuit comprises an RC filter consisting of a resistor R26, a resistor R182, a capacitor C56 and a capacitor C19, and the resistor R26 is connected with the resistor R182 and the capacitor C56 which are connected in parallel and then grounded; the resistor R26 is connected with the capacitor C19 and then output to the codec.
Further, the second filter circuit collects a playing signal output by the cathode of the loudspeaker through a resistor R15 of 0R.
The second purpose of the utility model is realized by adopting the following technical scheme:
an audio device comprising a discrete component based echo cancellation circuit as described above.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model collects the sound of the loudspeaker as the squelch reference through the discrete component circuit, and distinguishes the sound of the loudspeaker from the sound of the speaking of the person by utilizing the coder-decoder and realizes the effect of echo cancellation.
Drawings
FIG. 1 is a block schematic diagram of a discrete component-based echo cancellation circuit according to the present invention;
fig. 2 is a circuit diagram of an echo cancellation module according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example one
The embodiment provides an echo cancellation circuit based on discrete components, and the echo cancellation circuit can be applied to an intelligent sound box, so that the problem of acoustic echo cancellation can be well solved while the man-machine interaction function is realized on the intelligent sound box.
As shown in fig. 1, the echo cancellation circuit of this embodiment specifically includes a microphone module, a speaker, an echo cancellation module, a codec, a processor module, and a power amplifier module. The microphone module is used for collecting sound signals, the sound signals comprise human-computer interaction voice instructions collected by the microphone and initiated by a user, and background sounds collected by the microphone when the user makes a sound, and the background sounds comprise sounds played by the loudspeaker. The loudspeaker is used for outputting a playing signal to achieve the purpose of playing sound externally, and the sound played externally by the loudspeaker can be the sound of the user speaking collected by the microphone and can also be a sound source generated by the intelligent sound box processor.
In this embodiment, the echo cancellation module collects the sound of the speaker as a muting reference through a discrete component, and sends the collected sound of the speaker to the codec for echo cancellation.
Specifically, the echo cancellation module is connected to the microphone module, and configured to receive a sound signal collected by the microphone module and transmit the sound signal to the codec; in addition, the echo cancellation module comprises a first filter circuit and a second filter circuit, wherein the first filter circuit is connected with the anode (SP +) of the loudspeaker and is used for collecting an anode playing signal output by the loudspeaker from the anode of the loudspeaker; the second filter circuit is connected with the negative electrode (SP-) of the loudspeaker and used for collecting a negative electrode playing signal output by the loudspeaker from the negative electrode of the loudspeaker. In this embodiment, the echo cancellation module respectively collects the play signals output by the positive electrode and the negative electrode of the speaker through two filter circuits, and the two filter circuits are used for filtering and frequency-selecting the positive electrode and the negative electrode play signals through different filter circuits.
As shown in fig. 2, the first filter circuit collects the broadcast signal output by the positive electrode of the speaker through a resistor R12 of 0R, the resistor of 0R is equivalent to a very narrow current path, and can effectively limit the loop circuit, so that the noise is suppressed; the resistor R20 in the first filter circuit is connected with the resistor R28 and the capacitor C55 which are connected in parallel and then grounded, and the acquired positive pole playing signal is subjected to frequency selection through an RC filter consisting of the resistor R20 and the capacitor C11 and then is output to the codec.
Similarly, the second filter circuit collects the playing signal output by the cathode of the speaker through a resistor R15 of 0R, the second filter circuit comprises an RC filter consisting of a resistor R26, a resistor R182, a capacitor C56 and a capacitor C19, and the resistor R26 is connected with the resistor R182 and the capacitor C56 which are connected in parallel and then grounded; the collected negative playing signal is output to the codec after passing through an RC filter consisting of a resistor R26 and a capacitor C19. The specific parameter values of the resistor R20, the resistor R28, the resistor R182, the resistor R26, the capacitor C55, the capacitor C56, the capacitors C11 and C19 can be adjusted according to actual conditions.
In this embodiment, the echo cancellation module collects the sound of the speaker as a muting reference through the separation element circuit, and transmits the positive and negative signals after frequency selection and the sound signal collected by the microphone module to the codec, and performs audio comparison by using the codec to distinguish the sound of the speaker from the sound of a human speaking, so as to perform echo cancellation on the sound signal, that is, to eliminate the echo caused by feeding the sound of the speaker back to the microphone many times, thereby implementing muting processing. The audio comparison and echo cancellation method of the codec described in this embodiment is already disclosed in the prior art and will not be described in detail here.
The voice after the noise reduction processing mainly comprises the voice of a person speaking, and at the moment, the voice after the noise reduction processing can be played by a loudspeaker through a power amplification module; the method specifically comprises the following steps: the signal input end of the power amplification module of this embodiment is connected to the codec, and is configured to receive sound after squelch processing; the signal output end of the power amplification module is connected with the loudspeaker and is used for playing the signal subjected to squelch processing by the loudspeaker after passing through the power amplification module, and at the moment, the sound played by the loudspeaker does not have echo any more, so that bystanders can clearly hear the sound of the speaking of a person.
Meanwhile, the embodiment is also provided with a processor module, so that the voice of the person can be identified through the processor module, and corresponding interactive operation is performed according to the voice of the person; the method specifically comprises the following steps: the processor module is connected with the codec, the signal after the squelch processing is transmitted to the processor module, the processor module identifies the signal after the squelch processing, if the signal is identified to be an interactive instruction capable of activating an interactive function, a corresponding sound source signal is generated according to the interactive instruction, and the sound source signal is played by the loudspeaker after passing through the codec and the power amplifier module. For example: after a user sends music playing sound, the sound is identified by the processor module after the sound is subjected to squelch processing, so that the processor module generates a music sound source according to a music playing instruction and plays the music sound source.
Example two
The embodiment provides an audio device, which may be an intelligent sound box, and the audio device includes the echo cancellation circuit based on discrete components described in the first embodiment, so that the echo cancellation problem can be solved through the design of the discrete components of the added RC filter circuit while human-computer voice interaction can be realized.
The circuit structure in this embodiment and the circuit structure in the foregoing embodiment are based on two aspects of the same utility model concept, and the implementation process of the circuit structure has been described in detail in the foregoing, so that those skilled in the art can clearly understand the structure and implementation process of the device in this embodiment according to the foregoing description, and for the brevity of the description, the description is omitted here.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (8)
1. A discrete component based echo cancellation circuit, comprising:
the microphone module is used for collecting sound signals;
a speaker for outputting a play signal;
the echo cancellation module is respectively connected with the anode and the cathode of the loudspeaker through two filter circuits and is used for acquiring play signals output by the anode and the cathode of the loudspeaker and respectively filtering and frequency-selecting the play signals of the anode and the cathode through different filter circuits;
and the coder-decoder is used for carrying out audio comparison on the positive and negative signals after frequency selection and the sound signals acquired by the microphone module so as to carry out echo cancellation on the sound signals and realize squelch processing.
2. The discrete component-based echo cancellation circuit of claim 1, further comprising:
and the signal input end of the power amplifier module is connected with the coder-decoder, and the signal output end of the power amplifier module is connected with the loudspeaker and used for playing the signal subjected to squelch processing by the loudspeaker after passing through the power amplifier module.
3. The discrete component-based echo cancellation circuit of claim 2, further comprising:
and the processor module is connected with the coder-decoder and used for generating a corresponding sound source signal by taking the signal subjected to the squelch processing as an interactive instruction and playing the sound source signal by the loudspeaker after passing through the coder-decoder and the power amplifier module.
4. The discrete component-based echo cancellation circuit according to claim 1, wherein the playing signal output by the positive electrode of the speaker is filtered and frequency-selected by a first filter circuit, the first filter circuit includes an RC filter composed of a resistor R20, a resistor R28, a capacitor C55 and a capacitor C11, the resistor R20 is connected with a resistor R28 and a capacitor C55 which are connected in parallel and then grounded; the resistor R20 is connected with the capacitor C11 and then output to the codec.
5. The discrete component-based echo cancellation circuit according to claim 4, wherein the first filter circuit collects the playback signal output from the positive speaker output through a resistor R12 of 0R.
6. The discrete component-based echo cancellation circuit according to claim 1, wherein the playing signal output by the negative electrode of the speaker is filtered and frequency-selected by a second filter circuit, the second filter circuit includes an RC filter formed by a resistor R26, a resistor R182, a capacitor C56 and a capacitor C19, the resistor R26 is connected with the resistor R182 and the capacitor C56 which are connected in parallel and then grounded; the resistor R26 is connected with the capacitor C19 and then output to the codec.
7. The discrete component-based echo cancellation circuit according to claim 6, wherein the second filter circuit collects the playback signal output by the negative electrode of the speaker through a resistor R15 of 0R.
8. An audio device comprising the discrete component-based echo cancellation circuit of any of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122386041.7U CN216414578U (en) | 2021-09-29 | 2021-09-29 | Echo cancellation circuit based on discrete component and audio equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122386041.7U CN216414578U (en) | 2021-09-29 | 2021-09-29 | Echo cancellation circuit based on discrete component and audio equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216414578U true CN216414578U (en) | 2022-04-29 |
Family
ID=81294262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122386041.7U Active CN216414578U (en) | 2021-09-29 | 2021-09-29 | Echo cancellation circuit based on discrete component and audio equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216414578U (en) |
-
2021
- 2021-09-29 CN CN202122386041.7U patent/CN216414578U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10531191B2 (en) | Controller for haptic feedback element | |
| US9595252B2 (en) | Noise reduction audio reproducing device and noise reduction audio reproducing method | |
| JP4986182B2 (en) | Acoustic processing system, method and mobile phone terminal for electronic equipment | |
| CN111883156A (en) | Audio processing method and device, electronic equipment and storage medium | |
| CN103873975A (en) | Bluetooth headset noise reduction method, device and system | |
| JP2006139307A (en) | Apparatus having speech effect processing and noise control and method therefore | |
| US10856064B2 (en) | Operation of a personal audio device during insertion detection | |
| CN203537555U (en) | Audio device | |
| CN111372121A (en) | Echo cancellation method, device, storage medium and processor | |
| US20190221226A1 (en) | Electronic apparatus and echo cancellation method applied to electronic apparatus | |
| CN113395629B (en) | Earphone, audio processing method and device thereof, and storage medium | |
| CN103428593A (en) | Device for collecting audio signals based on loudspeaker | |
| CN111356058A (en) | Echo cancellation method and device and intelligent sound box | |
| CN105681529A (en) | Intelligent voice recording-playing device and method | |
| CN216414578U (en) | Echo cancellation circuit based on discrete component and audio equipment | |
| CN217335882U (en) | MEMS microphone | |
| CN203151729U (en) | Multifunctional earphone | |
| CN201717926U (en) | Active denoising system | |
| CN112969126B (en) | Acoustic sensor system, signal processing system, method and electronic device | |
| CN106328157A (en) | Voice processing circuit, mobile terminal and voice processing method | |
| CN104184886A (en) | Information processing method and electronic device | |
| CN210274436U (en) | Audio processing circuit and conference microphone | |
| CN203722801U (en) | Expansion fitting | |
| TWI736122B (en) | Time delay calibration method for acoustic echo cancellation and television device | |
| CN217335885U (en) | Microphone (CN) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |