CN112885365B - Echo cancellation device and vehicle-mounted intelligent terminal - Google Patents
Echo cancellation device and vehicle-mounted intelligent terminal Download PDFInfo
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- CN112885365B CN112885365B CN202110023219.3A CN202110023219A CN112885365B CN 112885365 B CN112885365 B CN 112885365B CN 202110023219 A CN202110023219 A CN 202110023219A CN 112885365 B CN112885365 B CN 112885365B
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L15/00—Speech recognition
- G10L15/22—Procedures used during a speech recognition process, e.g. man-machine dialogue
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L15/00—Speech recognition
- G10L15/22—Procedures used during a speech recognition process, e.g. man-machine dialogue
- G10L2015/223—Execution procedure of a spoken command
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L2021/02082—Noise filtering the noise being echo, reverberation of the speech
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
- G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
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- Engineering & Computer Science (AREA)
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- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
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- Quality & Reliability (AREA)
- Signal Processing (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
The invention discloses an echo cancellation device and a vehicle-mounted intelligent terminal, wherein the echo cancellation device comprises a microphone, a loudspeaker, a main control chip and an echo cancellation loop, the main control chip comprises a first microphone pin, a second microphone pin and an audio output pin, the first microphone pin is connected with the microphone and is used for collecting sound data through the microphone, the audio output pin is used for respectively transmitting audio signals to the echo cancellation loop and the loudspeaker, the echo cancellation loop is used for processing the audio signals and transmitting processed audio signals to the second microphone pin, and the main control chip is used for carrying out echo cancellation processing on the sound data by utilizing the processed audio signals. The echo cancellation device and the vehicle-mounted intelligent terminal can simplify the hardware structure of the device, save multiple microphones or noise reduction modules to realize noise reduction, reduce material cost and have better adaptability.
Description
Technical Field
The invention relates to an echo cancellation device and a vehicle-mounted intelligent terminal.
Background
Along with the release of the trade-purchase increasing purchase requirement and the improvement of the resident consumption capability caused by the rapid increase of the annual output sales volume and the holding volume of the domestic automobile, the trend of upgrading the automobile consumption is expected to be continuous in the future, and the demand of the automobile voice interactive experience is further expanded for consumers. It is expected that the cost of electronics on board the car will account for more than 30% of the total car cost in the next 10 years. The types of vehicle-mounted equipment are more and more, the voice interaction needs to be larger, and excellent voice interaction can bring safety and driving pleasure to driving.
At present, common intelligent vehicle-mounted electronic equipment adopts multiple microphones or additionally adds a noise reduction module to realize echo cancellation, so that the hardware cost and the installation cost of products are increased, and the power amplifier has various limitations such as specific type selection requirements.
Disclosure of Invention
The invention aims to overcome the defects of high hardware cost and installation cost and poor adaptability of an echo cancellation device in the prior art, and provides the echo cancellation device and the vehicle-mounted intelligent terminal which are simple in hardware structure, capable of saving multiple microphones or noise reduction modules to realize noise reduction, low in material cost and better in adaptability.
The invention solves the technical problems by the following technical scheme:
the utility model provides an echo cancellation device for intelligent terminal, its characterized in that, echo cancellation device includes a microphone, a speaker, a main control chip and an echo cancellation return circuit, main control chip includes first microphone pin, second microphone pin and audio output pin, first microphone pin with the microphone is connected and passes through the microphone collection sound data, audio output pin respectively to echo cancellation return circuit with the speaker transmits audio signal, echo cancellation return circuit is used for handling audio signal and to the audio signal after the second microphone pin transmission is handled, main control chip is used for utilizing the audio signal after handling carries out echo cancellation to sound data.
Preferably, the audio output pin includes a left channel pin and a right channel pin, the left channel pin and the right channel pin are respectively connected with a left channel and a right channel of the speaker, the echo cancellation device further includes a mixer, the left channel pin and the right channel pin are respectively connected with an input pin of the mixer, and an output pin of the mixer is connected with the echo cancellation loop.
Preferably, the echo cancellation loop includes a filter circuit, a voltage divider circuit and a dc-blocking circuit, and the echo cancellation loop is configured to process the audio signal and includes: and the DC blocking circuit is used for carrying out DC blocking processing on the audio signals after the frequency mixing of the frequency mixer, the voltage dividing circuit is used for carrying out voltage dividing processing on the audio signals after the DC blocking processing, and the filter circuit is used for carrying out filtering processing on the audio signals after the voltage dividing processing.
Preferably, the intelligent terminal further comprises a voice recognition module, and the main control chip is used for sending the audio signal after echo cancellation processing to the voice recognition module for voice recognition.
Preferably, the voice recognition module receives the audio signal after the echo cancellation processing and then judges whether a target keyword of a preset condition is received, if yes, voice information of preset voice is recognized through voice prints, and corresponding operation instructions are executed according to the voice information, wherein the preset condition comprises that voices of target voice print users are not received within preset time periods before and after the target keyword is received.
Preferably, the intelligent terminal is a vehicle-mounted intelligent terminal, the vehicle-mounted intelligent terminal comprises a motion sensor and a training module,
The motion sensor is used for collecting the current motion speed of the intelligent terminal,
The main control chip is used for collecting human voice and environmental sound sources through the microphone and recording a time line of microphone collection data and the movement speed under the time line,
The voice recognition module is used for removing human voice according to voice recognition to acquire an environmental sound source and acquiring a motion speed corresponding to the environmental sound source by utilizing the time line,
The training module performs AI training according to the motion speed corresponding to the environmental sound source to obtain an environmental sound source elimination sample;
The main control chip is also used for acquiring the current motion speed of the vehicle-mounted intelligent terminal through the motion sensor when the audio signal subjected to the echo cancellation processing is acquired, acquiring a corresponding environment sound source cancellation sample according to the current motion speed, and performing environment sound source cancellation processing on the audio signal subjected to the echo cancellation processing by using the environment sound source cancellation sample.
Preferably, the echo cancellation loop is connected to the second microphone pin through a power amplifier, and the power amplifier is an analog power amplifier or a digital power amplifier.
Preferably, the intelligent terminal is a vehicle-mounted intelligent terminal.
The invention also provides a vehicle-mounted intelligent terminal which is characterized by comprising the echo cancellation device.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The invention has the positive progress effects that:
the multi-channel microphone or the noise reduction module is not required to be added to realize noise reduction, the material cost is saved, the MIC installation cost is saved, and the multi-channel MIC is higher in wiring cost when installed on a vehicle
The adaptation is better, and an AEC (echo cancellation) reference signal is acquired from the front end of the loudspeaker audio PA, and is connected into an AEC loop through a mixer, so that the model and mode (both digital and analog) of the on-board audio PA do not need to be considered. The assembly suitability of various vehicle types is increased
Even if loudspeakers are added in the later stage, each loudspeaker does not need to be connected with a loop to AEC (echo cancellation loop), because the inputs of all loudspeakers are the same and only have left and right channels.
Drawings
Fig. 1 is a schematic structural diagram of an echo cancellation device according to embodiment 1 of the present invention.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1, the present embodiment provides a vehicle-mounted intelligent terminal, which includes a response eliminating device.
The echo cancellation device comprises a microphone 11, a loudspeaker 12, a main control chip 13 and an echo cancellation loop 14.
The main control chip comprises a first microphone pin 131, a second microphone pin 132 and an audio output pin 133.
The first microphone pin is connected with the microphone and collects sound data through the microphone.
The audio output pins respectively transmit audio signals to the echo cancellation loop and the loudspeaker.
The echo cancellation loop of the present embodiment is connected by pin 141.
The echo cancellation loop is configured to process the audio signal and transmit the processed audio signal to the second microphone pin.
The main control chip is used for carrying out echo cancellation processing on the sound data by utilizing the processed audio signals.
Further, the audio output pins include a left channel pin and a right channel pin.
The left channel pin and the right channel pin are respectively connected with left and right channels of the loudspeaker.
The echo cancellation device further comprises a mixer 145, wherein the left channel pin and the right channel pin are respectively connected with the input pin of the mixer, and the output pin of the mixer is connected with the echo cancellation loop.
The echo cancellation loop includes a filter circuit 142, a voltage divider circuit 143, and a dc blocking circuit 144.
The echo cancellation loop is configured to process the audio signal, including: and the DC blocking circuit is used for carrying out DC blocking processing on the audio signals after the frequency mixing of the frequency mixer, the voltage dividing circuit is used for carrying out voltage dividing processing on the audio signals after the DC blocking processing, and the filter circuit is used for carrying out filtering processing on the audio signals after the voltage dividing processing.
Specifically, the main control chip outputs speaker sound sources HPR & HPL to the right channel speaker and the left channel speaker at the rear end, and finally stereo playing is formed.
Meanwhile, the loudspeaker sound source HPR (right channel) and HPL (left channel) output by the main control chip are output to the mixer, and finally the mixed signals are output to the AEC loop; the direct current is blocked by a direct current blocking circuit, so that the damage of a direct current signal input lead-in rear-end circuit is prevented; the signal after blocking the direct current passes through a voltage dividing circuit, and the high-amplitude signal is divided into a low-amplitude signal by a first resistor and a second resistor so as to prevent the signal from exceeding the maximum amplitude received by a second microphone pin; the divided signals pass through a filter circuit formed by a capacitor and an inductor to filter high-frequency signals which are connected in series in the circuit; and finally, inputting the clean AEC reference signal to a second microphone pin of the main control chip.
The intelligent terminal also comprises a voice recognition module, and the main control chip is used for sending the audio signal after echo cancellation processing to the voice recognition module for voice recognition.
And the voice recognition module receives the audio signal after the echo cancellation processing and then judges whether a target keyword of a preset condition is received, if yes, voice information of preset voice is recognized through voice prints, and corresponding operation instructions are executed according to the voice information, wherein the preset condition comprises that voices of target voice print users are not received within preset time periods before and after the target keyword is received.
The vehicle-mounted intelligent terminal comprises a motion sensor and a training module,
The motion sensor is used for collecting the current motion speed of the intelligent terminal,
The main control chip is used for collecting human voice and environmental sound sources through the microphone and recording a time line of microphone collection data and the movement speed under the time line,
The voice recognition module is used for removing human voice according to voice recognition to acquire an environmental sound source and acquiring a motion speed corresponding to the environmental sound source by utilizing the time line,
The training module performs AI training according to the motion speed corresponding to the environmental sound source to obtain an environmental sound source elimination sample;
The main control chip is also used for acquiring the current motion speed of the vehicle-mounted intelligent terminal through the motion sensor when the audio signal subjected to the echo cancellation processing is acquired, acquiring a corresponding environment sound source cancellation sample according to the current motion speed, and performing environment sound source cancellation processing on the audio signal subjected to the echo cancellation processing by using the environment sound source cancellation sample.
The echo cancellation loop is connected with the second microphone pin through a power amplifier, and the power amplifier is an analog power amplifier or a digital power amplifier.
The input end of the audio PA (power amplifier) is connected to the echo noise reduction loop, so that the type and the amplifying bit number of the selected audio PA are unlimited, and the analog PA and the digital PA can be selected; the high-power PA or the low-power PA can be selected.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (7)
1. The echo cancellation device is used for an intelligent terminal and is characterized by comprising a microphone, a loudspeaker, a main control chip and an echo cancellation loop, wherein the main control chip comprises a first microphone pin, a second microphone pin and an audio output pin, the first microphone pin is connected with the microphone and is used for collecting sound data through the microphone, the audio output pin is used for respectively transmitting audio signals to the echo cancellation loop and the loudspeaker, the echo cancellation loop is used for processing the audio signals and transmitting processed audio signals to the second microphone pin, and the main control chip is used for carrying out echo cancellation processing on the sound data by utilizing the processed audio signals;
the intelligent terminal also comprises a voice recognition module, and the main control chip is used for sending the audio signal subjected to echo cancellation processing to the voice recognition module for voice recognition;
The intelligent terminal is a vehicle-mounted intelligent terminal, the vehicle-mounted intelligent terminal comprises a motion sensor and a training module,
The motion sensor is used for collecting the current motion speed of the intelligent terminal,
The main control chip is used for collecting human voice and environmental sound sources through the microphone and recording a time line of microphone collection data and the movement speed under the time line,
The voice recognition module is used for removing human voice according to voice recognition to acquire an environmental sound source and acquiring a motion speed corresponding to the environmental sound source by utilizing the time line,
The training module performs AI training according to the motion speed corresponding to the environmental sound source to obtain an environmental sound source elimination sample;
The main control chip is also used for acquiring the current motion speed of the vehicle-mounted intelligent terminal through the motion sensor when the audio signal subjected to the echo cancellation processing is acquired, acquiring a corresponding environment sound source cancellation sample according to the current motion speed, and performing environment sound source cancellation processing on the audio signal subjected to the echo cancellation processing by using the environment sound source cancellation sample.
2. The echo cancellation device of claim 1, wherein the audio output pins include left and right channel pins, the left and right channel pins being connected to left and right channels of the speaker, respectively, the echo cancellation device further comprising a mixer, the left and right channel pins being connected to input pins of the mixer, respectively, the output pins of the mixer being connected to the echo cancellation loop.
3. The echo cancellation device of claim 2, wherein the echo cancellation loop comprises a filter circuit, a voltage divider circuit, and a dc blocking circuit, the echo cancellation loop for processing the audio signal comprising: and the DC blocking circuit is used for carrying out DC blocking processing on the audio signals after the frequency mixing of the frequency mixer, the voltage dividing circuit is used for carrying out voltage dividing processing on the audio signals after the DC blocking processing, and the filter circuit is used for carrying out filtering processing on the audio signals after the voltage dividing processing.
4. The echo cancellation device of claim 1, wherein the voice recognition module receives the echo cancellation processed audio signal and then determines whether a target keyword of a preset condition is received, if yes, voice information of a preset voice is recognized through the voice print, and a corresponding operation instruction is executed according to the voice information, and the preset condition includes that voices of a target voice print user are not received within a preset time period before and after the time of receiving the target keyword.
5. The echo cancellation device of claim 1, wherein the echo cancellation loop is connected to the second microphone pin through a power amplifier, wherein the power amplifier is an analog power amplifier or a digital power amplifier.
6. The echo cancellation device of claim 1, wherein the intelligent terminal is a vehicle-mounted intelligent terminal.
7. A vehicle-mounted intelligent terminal, characterized in that the vehicle-mounted intelligent terminal comprises an echo cancellation device as claimed in any one of claims 1 to 6.
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| CN202110023219.3A CN112885365B (en) | 2021-01-08 | 2021-01-08 | Echo cancellation device and vehicle-mounted intelligent terminal |
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| CN202110023219.3A CN112885365B (en) | 2021-01-08 | 2021-01-08 | Echo cancellation device and vehicle-mounted intelligent terminal |
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| CN113411698B (en) * | 2021-06-21 | 2022-11-25 | 歌尔科技有限公司 | Audio signal processing method and intelligent sound box |
| CN113823310B (en) * | 2021-11-24 | 2022-02-22 | 南昌龙旗信息技术有限公司 | Voice interruption wake-up circuit applied to tablet computer |
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| CN110741563A (en) * | 2017-06-12 | 2020-01-31 | 铁三角有限公司 | Speech signal processing device, speech signal processing method, and speech signal processing program |
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- 2021-01-08 CN CN202110023219.3A patent/CN112885365B/en active Active
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