CN112885365A - Echo eliminating device and vehicle-mounted intelligent terminal - Google Patents
Echo eliminating device and vehicle-mounted intelligent terminal Download PDFInfo
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- CN112885365A CN112885365A CN202110023219.3A CN202110023219A CN112885365A CN 112885365 A CN112885365 A CN 112885365A CN 202110023219 A CN202110023219 A CN 202110023219A CN 112885365 A CN112885365 A CN 112885365A
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- 230000007613 environmental effect Effects 0.000 claims description 3
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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
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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
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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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Abstract
The invention discloses an echo eliminating device and a vehicle-mounted intelligent terminal, wherein the echo eliminating device comprises a microphone, a loudspeaker, a main control chip and an echo eliminating 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 collects sound data through the microphone, the audio output pin transmits audio signals to the echo eliminating loop and the loudspeaker respectively, the echo eliminating loop is used for processing the audio signals and transmitting the processed audio signals to the second microphone pin, and the main control chip is used for utilizing the processed audio signals to perform echo eliminating processing on the sound data. The echo eliminating device and the vehicle-mounted intelligent terminal can simplify the hardware structure of equipment, 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 eliminating device and a vehicle-mounted intelligent terminal.
Background
Along with the release of the repurchase and purchase-increasing demand and the improvement of the resident consumption capacity caused by the rapid increase of the annual output and sales volume and the holdup volume of the domestic automobiles, the trend of upgrading automobile consumption is expected to be continuous in the future, and the interactive experience demand of the consumers on the automobile voice is further expanded. It is expected that the cost of the electronics on the automobile will account for more than 30% of the total automobile cost in the next 10 years. The vehicle-mounted equipment is more and more in variety, the voice interaction is more and more in demand, and excellent voice interaction can bring safety and driving pleasure for driving.
At present, echo cancellation is realized by adopting a multi-path microphone or additionally adding a noise reduction module in common intelligent vehicle-mounted electronic equipment, the hardware cost and the installation cost of products are increased, and the power amplifier has various limitations such as specific type selection requirements and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of high hardware cost and installation cost and poor adaptability of an echo cancellation device product in the prior art, and provide an echo cancellation device and a vehicle-mounted intelligent terminal which are simplified in equipment hardware structure, save multiple microphones or noise reduction modules to realize noise reduction, reduce material cost and have better adaptability.
The invention solves the technical problems through the following technical scheme:
the echo eliminating device is used for an intelligent terminal and is characterized by comprising a microphone, a loudspeaker, a main control chip and an echo eliminating 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 collects sound data through the microphone, the audio output pin transmits audio signals to the echo eliminating loop and the loudspeaker respectively, the echo eliminating loop is used for processing the audio signals and transmitting the processed audio signals to the second microphone pin, and the main control chip is used for utilizing the processed audio signals to perform echo eliminating processing on the 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 to left and right channels of the speaker, the echo cancellation device further includes a mixer, the left channel pin and the right channel pin are respectively connected to an input pin of the mixer, and an output pin of the mixer is connected to the echo cancellation loop.
Preferably, the echo cancellation loop includes a filter circuit, a voltage divider circuit and a dc blocking circuit, and the processing of the audio signal by the echo cancellation loop includes: the direct current blocking circuit is used for carrying out direct current blocking processing on the audio signal subjected to frequency mixing of the frequency mixer, the voltage division circuit is used for carrying out voltage division processing on the audio signal subjected to direct current blocking processing, and the filter circuit is used for carrying out filter processing on the audio signal subjected to voltage division processing.
Preferably, the intelligent terminal further includes a voice recognition module, and the main control chip is configured to send 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 so, the voice information of a preset voice is recognized through voiceprint, and a corresponding operation instruction is executed according to the voice information, wherein the preset condition includes that the voice of the target voiceprint user is not received within a preset time 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 acquiring 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, recording a time line of data collected by the microphone and the movement speed under the time line,
the voice recognition module is used for removing human voice according to voice recognition to obtain an environment sound source and obtaining the corresponding movement speed of the environment sound source by utilizing the time line,
the training module performs AI training according to the environment sound source and the movement speed corresponding to the environment sound source to obtain an environment sound source elimination sample;
the main control chip is further used for acquiring the current movement speed of the vehicle-mounted intelligent terminal through the movement sensor when the audio signal after echo cancellation processing is acquired, acquiring a corresponding environment sound source cancellation sample according to the current movement speed, and utilizing the audio signal after echo cancellation processing to perform environment sound source cancellation processing on 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 eliminating device.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows:
the noise reduction is realized without adding a plurality of microphones or noise reduction modules, the material cost is saved, the MIC installation cost is saved, and the wiring cost of the plurality of microphones for installation on the vehicle is higher
The adaptation is better, and the AEC (echo cancellation) reference signal is gathered from loudspeaker audio PA front end, inserts the AEC return circuit through the mixer, need not consider the model and the mode (digital and analog all can) of on-vehicle audio PA. Increase the adaptability of rear loading of various vehicle types
Even if the loudspeakers are added in the later period, each loudspeaker does not need to be connected with a loop to an AEC (echo cancellation loop), because the input of all the loudspeakers is the same and only left and right sound channels exist.
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 the following examples, which are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1, the present embodiment provides an in-vehicle intelligent terminal, which includes a response cancellation apparatus.
The echo cancellation device includes a microphone 11, a speaker 12, a main control chip 13 and an echo cancellation loop 14.
The main control chip includes 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.
And the audio output pin transmits audio signals to the echo cancellation loop and the loudspeaker respectively.
The echo cancellation loop of this embodiment is connected via pin 141.
The echo cancellation loop is used for processing the audio signal and transmitting the processed audio signal to the second microphone pin.
The main control chip is used for carrying out echo elimination processing on the sound data by utilizing the processed audio signal.
Further, the audio output pins include a left channel pin and a right channel pin.
The left sound channel pin and the right sound channel pin are respectively connected with the left sound channel and the right sound channel 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 an input pin of the mixer, and an 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 and includes: the direct current blocking circuit is used for carrying out direct current blocking processing on the audio signal subjected to frequency mixing of the frequency mixer, the voltage division circuit is used for carrying out voltage division processing on the audio signal subjected to direct current blocking processing, and the filter circuit is used for carrying out filter processing on the audio signal subjected to voltage division processing.
Specifically, the main control chip outputs speaker sound sources HPR & HPL to the rear-end right channel speaker and left channel speaker, and finally stereo playing is formed.
Meanwhile, horn sound sources HPR (right channel) and HPL (left channel) output by the main control chip are output to the mixer, and finally signals after frequency mixing are output to the AEC loop; the direct current is blocked by the direct current blocking circuit, so that the direct current signal input and led into the back end circuit is prevented from being damaged; the signal after the direct current isolation is subjected to voltage division by a voltage division circuit, and a 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 pin of a second microphone; the divided signals pass through a filter circuit formed by a capacitor and an inductor to filter high-frequency signals connected in series in the circuit; the clean AEC reference signal is finally input to the second microphone pin of the master control chip.
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 voice recognition module receives the audio signal after echo cancellation processing, judges whether a target keyword of a preset condition is received, if so, recognizes voice information of a preset voice through voiceprint, and executes a corresponding operation instruction according to the voice information, wherein the preset condition comprises that the voice of a target voiceprint user is not received within a preset time 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 acquiring 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, recording a time line of data collected by the microphone and the movement speed under the time line,
the voice recognition module is used for removing human voice according to voice recognition to obtain an environment sound source and obtaining the corresponding movement speed of the environment sound source by utilizing the time line,
the training module performs AI training according to the environment sound source and the movement speed corresponding to the environment sound source to obtain an environment sound source elimination sample;
the main control chip is further used for acquiring the current movement speed of the vehicle-mounted intelligent terminal through the movement sensor when the audio signal after echo cancellation processing is acquired, acquiring a corresponding environment sound source cancellation sample according to the current movement speed, and utilizing the audio signal after echo cancellation processing to perform environment sound source cancellation processing on 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 an audio PA (power amplifier) is accessed to an echo noise reduction loop, the type and amplification digit of the selected audio PA are not limited, and an analog PA or a digital PA can be selected; the high-power PA and 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 that 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 spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (9)
1. The echo eliminating device is used for an intelligent terminal and is characterized by comprising a microphone, a loudspeaker, a main control chip and an echo eliminating 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 collects sound data through the microphone, the audio output pin transmits audio signals to the echo eliminating loop and the loudspeaker respectively, the echo eliminating loop is used for processing the audio signals and transmitting the processed audio signals to the second microphone pin, and the main control chip is used for utilizing the processed audio signals to perform echo eliminating processing on the sound data.
2. The echo canceller as claimed in claim 1, wherein 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 to left and right channels of the speaker, the echo canceller further includes a mixer, the left channel pin and the right channel pin are respectively connected to an input pin of the mixer, and an output pin of the mixer is connected to the echo cancellation loop.
3. The echo cancellation device according to claim 2, wherein the echo cancellation loop comprises 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 comprises: the direct current blocking circuit is used for carrying out direct current blocking processing on the audio signal subjected to frequency mixing of the frequency mixer, the voltage division circuit is used for carrying out voltage division processing on the audio signal subjected to direct current blocking processing, and the filter circuit is used for carrying out filter processing on the audio signal subjected to voltage division processing.
4. The echo canceller according to claim 2, wherein the intelligent terminal further includes a voice recognition module, and the main control chip is configured to send the audio signal after the echo cancellation process to the voice recognition module for voice recognition.
5. The echo canceller according to claim 4, wherein the voice recognition module receives the processed audio signal to determine whether a target keyword of a predetermined condition is received, and if so, recognizes voice information of a predetermined voice through voiceprint, and executes a corresponding operation command according to the voice information, and the predetermined condition includes that the voice of the target voiceprint user is not received within a predetermined time period before and after the target keyword is received.
6. The echo cancellation device according to claim 4, wherein the smart terminal is a vehicle-mounted smart terminal, the vehicle-mounted smart terminal includes a motion sensor and a training module,
the motion sensor is used for acquiring 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, recording a time line of data collected by the microphone and the movement speed under the time line,
the voice recognition module is used for removing human voice according to voice recognition to obtain an environment sound source and obtaining the corresponding movement speed of the environment sound source by utilizing the time line,
the training module performs AI training according to the environment sound source and the movement speed corresponding to the environment sound source to obtain an environment sound source elimination sample;
the main control chip is further used for acquiring the current movement speed of the vehicle-mounted intelligent terminal through the movement sensor when the audio signal after echo cancellation processing is acquired, acquiring a corresponding environment sound source cancellation sample according to the current movement speed, and utilizing the audio signal after echo cancellation processing to perform environment sound source cancellation processing on the environment sound source cancellation sample.
7. The echo cancellation device according to claim 1, wherein 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.
8. The echo cancellation device according to claim 1, wherein the smart terminal is a vehicle-mounted smart terminal.
9. An in-vehicle intelligent terminal, characterized in that the in-vehicle intelligent terminal comprises the echo cancellation device according to any one of claims 1 to 8.
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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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| CN113411698A (en) * | 2021-06-21 | 2021-09-17 | 歌尔科技有限公司 | Audio signal processing method and intelligent sound box |
| CN113823310A (en) * | 2021-11-24 | 2021-12-21 | 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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