CN107452395A - A kind of voice signal echo cancelling device and television set - Google Patents
A kind of voice signal echo cancelling device and television set Download PDFInfo
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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
- 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
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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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Abstract
The invention discloses a kind of voice signal echo cancelling device and television set, described device to include：Microphone array, for gathering the current speech signal in environment, current speech signal is transmitted to sound processing chip；Central processing unit, for obtaining audio signal corresponding to audio to be played, by audio signal transmission to power amplifier；Power amplifier, for audio signal to be sent to sound processing chip, and signal amplification is carried out to audio signal and obtains drive signal, drive signal is transmitted to loudspeaker；Sound processing chip, for being sampled to the audio signal received, echo sampled signal is obtained, and echo filter is carried out to current speech signal according to echo sampled signal, obtain targeted voice signal.Because the audio signal and the drive signal of loudspeaker that are sampled are all from power amplifier, so as to shorten audio signal sampling and the delay of speech signal collection, the accuracy of echo cancellor are improved, optimizes Consumer's Experience.
Description
Technical field
The invention belongs to electronic technology field, more particularly to a kind of voice signal echo cancelling device and television set.
Background technology
With phonetic algorithm maturation and television set intelligently degree lifting, in recent years major television manufacturer develop one after another
The TV of various types of voice input function.
At present, the input mode for carrying out voice on TV mainly has the following two kinds, and the first is to use to have voice defeated
Enter the blue Tooth remote controller of function, second is to use wireless microphone.But this two ways be accomplished that near field voice, it is necessary to
Close to people, the problem of inconvenient for use on be present by family in the equipment such as microphone or remote control.Based on this, far field microphone
It will be the direction of following intelligent sound TV, i.e., by microphone design on a television set, current technology, can substantially expire
Remote phonetic entry demand within 8 meters of foot, this distance are entirely capable of the phonetic entry demand for meeting TV.But this design
Following problem occurs：Because microphone is close to television set, and the loudspeaker of television set the machine also can sounding, the sound of the machine enters
After microphone, then the loudspeaker through the machine play back, and go round and begin again, and produce echo, therefore the speaker sound of the machine need to be carried out
Echo cancellation.
The application aspect of voice in far field, it is substantially that voice is converted to USB (Universal at present
Serial Bus, USB) signal inputs to television set by USB passages, and echo cancellation is by audio frequency and video delivery outlet
The audio output of (Audio Video-Out, AV-OUT) is sampled, and microphone is external, not only influences television set overall appearance,
And in the echo cancellation of such a mode, sampling time inconvenience control, mainly in television set processing, AV-OUT audio output
It is to handle directly to export without Digital Signal Processing (Digital Signal Processing, DSP), and the sound of loudspeaker
Sound is passing through DSP processing, and delay by power amplifier amplification output, this process be present, influence echo cancellor to a certain extent
Effect and accuracy of speech recognition, therefore existing echo cancellation schemes also need to improve.
The above is only used for auxiliary and understands technical scheme, does not represent and recognizes that the above is existing skill
Art.
The content of the invention
It is a primary object of the present invention to provide a kind of voice signal echo cancelling device and television set, it is intended to solve existing
Delay, the ineffective technical problem of echo cancellor are sampled when carrying out echo cancellor with the presence of voice television machine in technology.
To achieve the above object, the invention provides a kind of voice signal echo cancelling device, described device to include：Mike
Wind array, central processing unit, power amplifier and sound processing chip；
The microphone array, transmitted for gathering the current speech signal in environment, and by the current speech signal
To the sound processing chip；
The central processing unit, for obtaining audio signal corresponding to audio to be played, and by the audio signal transmission
To the power amplifier；
The power amplifier, for the audio signal to be sent to the sound processing chip, and to the audio
Signal carries out signal amplification and obtains drive signal, the drive signal is transmitted to loudspeaker, so that the loudspeaker is to described
Drive signal plays out；
The sound processing chip, for being sampled to the audio signal received, obtain echo sampled signal, and root
Echo filter is carried out to the current speech signal according to the echo sampled signal, targeted voice signal is obtained, to realize echo
Eliminate.
Preferably, the sound processing chip includes：
Signal enhancing unit, for carrying out signal enhancing to the current speech signal received, obtain language to be compared
Sound signal, signal enhancing is carried out to the echo sampled signal, obtains echo sampled signal to be compared；
Comparator, for carrying out echo mistake to the voice signal to be compared according to the echo sampled signal to be compared
Filter, obtain targeted voice signal.
Preferably, the sound processing chip also includes：
Sampling unit, carried out for carrying out analog-to-digital conversion to the current speech signal, and to the voice signal after conversion
Digital sample；
Wave filter, for being filtered processing to the voice signal after progress digital sample, obtain filtered voice letter
Number, and filtered signal is transmitted to the signal enhancing unit.
Preferably, the sound processing chip also includes：
Level shifting circuit, for being carried out respectively to the voice signal to be compared and the echo sampled signal to be compared
Level conversion, obtain the voice signal to be locked after conversion and echo sampled signal to be locked；And/or
Phase-locked loop circuit, for carrying out phase respectively to the voice signal to be locked and the echo sampled signal to be locked
Position locking, obtains the voice signal to be divided after PGC demodulation and echo sampled signal to be divided；And/or
Frequency divider, for carrying out signal frequency split to the voice signal to be divided, to the echo sampled signal to be divided
Carry out signal frequency split；
Correspondingly, the comparator is additionally operable to return the echo sampled signal after the voice signal and frequency dividing after frequency dividing
Sound filters, and obtains targeted voice signal.
Preferably, the comparator, it is additionally operable to receive the voice signal that normal phase input end receives with inverting input
Echo sampled signal is compared, and exports targeted voice signal, to realize the echo filter to the voice signal.
Preferably, the sound processing chip, in addition to：
Logical-arithmetic unit, for carrying out logical operation process to the targeted voice signal, obtain voice signal to be modulated；
Signal modulation unit, for carrying out signal modulation to the voice signal to be modulated, efficient voice signal is obtained, and
The efficient voice signal is transmitted to the central processing unit.
Preferably, the signal modulation unit, specifically for carrying out signal modulation to the voice signal to be modulated, and it is right
Voice signal after modulation enters row format conversion, obtains efficient voice signal, and the efficient voice signal is transmitted to described
Central processing unit.
Preferably, the logical-arithmetic unit, it is additionally operable to send the voice signal to be modulated to level conversion electricity
Road, so that the level shifting circuit enters line level to the voice signal of receipt of subsequent according to the voice signal to be modulated and turned
Change.
Preferably, described device also includes：Memory cell, the operational data sent for receiving the logical-arithmetic unit,
And the budget data is stored.
In addition, the present invention also proposes a kind of television set, the television set includes above-mentioned voice signal echo cancelling device.
Current speech signal in inventive microphone array acquisition environment, and the current speech signal is transmitted to sound
Sound process chip, central processing unit obtain audio signal corresponding to audio to be played, and by the audio signal transmission to power
Amplifier, power amplifier send the audio signal to sound processing chip, and carry out signal to the audio signal and put
It is big to obtain drive signal, the drive signal is transmitted to loudspeaker, so that the loudspeaker is broadcast to the drive signal
Put, sound processing chip is sampled to the audio signal received, obtains echo sampled signal, and sample according to the echo
Signal carries out echo filter to the current speech signal, obtains targeted voice signal.Due to the audio signal that is sampled and
The drive signal of loudspeaker is all from power amplifier, so as to shorten audio signal sampling and the delay of speech signal collection,
The accuracy of echo cancellor is improved, optimizes Consumer's Experience.
Brief description of the drawings
Fig. 1 is the structured flowchart of voice signal echo cancelling device first embodiment of the present invention；
Fig. 2 be Fig. 1 shown in voice signal echo cancelling device in central processing unit and sound processing chip initialization
Flow chart；
Fig. 3 be Fig. 1 shown in voice signal echo cancelling device in sound processing chip structured flowchart；
Fig. 4 be Fig. 1 shown in voice signal echo cancelling device in sound processing chip another structured flowchart；
Fig. 5 be Fig. 4 shown in sound processing chip in level shifting circuit circuit theory diagrams；
Fig. 6 is the structured flowchart of voice signal echo cancelling device fourth embodiment of the present invention；
Fig. 7 is the structured flowchart of the embodiment of voice signal echo cancelling device the 5th of the present invention.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that specific embodiment described herein is not intended to limit the present invention only to explain the present invention.
Reference picture 1, Fig. 1 are the structured flowchart of voice signal echo cancelling device first embodiment of the present invention.Wherein, it is described
Voice signal echo cancelling device includes：Microphone array 10, sound processing chip 20, central processing unit 30 and power amplifier
40；
The microphone array 10, passed for gathering the current speech signal in environment, and by the current speech signal
Transport to the sound processing chip；
The central processing unit 30, passed for obtaining audio signal corresponding to audio to be played, and by the audio signal
Transport to the power amplifier 40；
The power amplifier 40, for the audio signal to be sent to the sound processing chip 20, and to described
Audio signal carries out signal amplification and obtains drive signal, the drive signal is transmitted to loudspeaker, so that the loudspeaker pair
The drive signal plays out；
The sound processing chip 20, for being sampled to the audio signal received, echo sampled signal is obtained, and
Echo filter is carried out to the current speech signal according to the echo sampled signal, targeted voice signal is obtained, to realize back
Sound eliminates.
It should be noted that the application scenarios for the voice signal echo cancelling device that the embodiment of the present invention proposes can be electricity
Depending on machine, the microphone array 10 is built near the loudspeaker of the television set；The central processing unit 30 is opened in television set
System initialization can be carried out after machine, then the sound processing chip 20 is resetted and input/output (Input/
Output, IO) interface initialization is set, and the triggering of waiting voice function, and receiving trigger signal, (i.e. current speech is believed
Number) when, the sound processing chip 20 is entered by twin wire universal serial bus (Inter-Integrated Circuit, I2C)
Row Control on Communication, the Control on Communication include：Control and/or I/O interface initialization control etc. are resetted, in addition, the central processing
Device 30 can also detect whether phonetic function interrupt signal, when there is interrupt signal, in being sent to the sound processing chip 20
Severed finger makes, so that the sound processing chip 20, when receiving the interrupt instruction, end signal processing operates.
The specific initialization flow of the central processing unit 30 and the sound processing chip 20 is carried out with reference to Fig. 2
Explanation：
As shown in Fig. 2 the initialization flow specifically includes：
Step S1：When receiving start-up command, system initialization is carried out；
Step S2：The sound processing chip is carried out to reset setting and input/output interface Initialize installation；
Step S3：State setting is carried out to the sound processing chip, so that the sound processing chip is in slave unit
State；
Step S4：The microphone array is called to be acquired the voice signal of surrounding environment；
Step S5：When getting voice signal, Control on Communication is carried out to the sound processing chip；
Step S6：The sound processing chip is controlled to carry out echo cancellation operation；
Step S7：Detect in the voice signal and whether include voice interruption signal；
Step S8：If so, then terminate current ongoing voice collecting and echo cancellation operation；
Step S9：If nothing, step S7 is continued executing with.
When in the specific implementation, the central processing unit 30 is receiving start-up command, execution system initialization operation it
Afterwards, the sound processing chip 20 is carried out resetting setting and input/output interface Initialize installation, then to the sound
Process chip 20 carries out state setting, so that the sound processing chip 20 is in slave unit state.Above-mentioned initialization procedure is complete
Cheng Hou, the central processing unit 30 call the microphone array 10 to be acquired the voice signal of surrounding environment；Work as collection
During to voice signal, Control on Communication is carried out to the sound processing chip 20, so that the sound processing chip 20 carries out voice
Signal transacting and echo cancellation operation.
In addition, the real-Time Speech Signals that the central processing unit 30 can also collect to the microphone array 10 are examined
Survey, to detect in the real-Time Speech Signals whether include voice interruption signal；If comprising the voice interruption signal, to institute
State sound processing chip 20 and send no-operation instruction, so that the sound processing chip 20 terminates current ongoing voice
Collection and echo cancellation process operation；If not including the voice interruption signal, the sound processing chip 20 keeps current
Operate constant.
In the present embodiment, the microphone array 10 can include one or more microphone, in the present embodiment
In, the number of the microphone is preferably 2, and the microphone is used to gather the current speech signal in surrounding environment, and will
The current speech signal collected is transmitted to the sound processing chip 20, and television set described in the present embodiment is also including being in addition
The electric power system (not shown) of its internal each electronics.
It should be understood that the central processing unit 30 is the CPU of television internal, the central processing unit in this embodiment
30 when getting audio signal corresponding to audio to be played, by the audio signal transmission to the power amplifier 40.
It should be noted that generally, power amplifier be used to being amplified the ultra-weak electronic signal of signal source with
Drive the speaker sounding；Power amplifier 40 described in the present embodiment is used for the audio signal for sending the central processing unit 30
Transmitting to the sound processing chip 20, it is contemplated that digital power amplifier has the advantages that distortion is small, noise is low and dynamic range is big,
In the present embodiment, the power amplifier 40 is preferably digital power amplifier (i.e. digital power amplifier).The numeral that this implementation uses
Power amplifier can be the core with integrated circuit built-in audio (Inter-IC Sound, I2S) input and I2S output functions
Piece, such as TAS5754M.
In the present embodiment, the audio signal that the one side of power amplifier 40 is sent to central processing unit 30 carries out digital-to-analogue
Conversion, generates drive signal after the audio signal after conversion is amplified, and the drive signal is transmitted to raising one's voice
Device, so that the loudspeaker sounding；On the other hand, the audio that the power amplifier 40 sends the central processing unit 30 is believed
Number transmitted by I2S interfaces to the sound processing chip 20.
In the present embodiment, the audio of the audio signal delivery outlet of the power amplifier 40 and the sound processing chip 20
Signal input is connected, and the sound processing chip 20 is right when receiving the audio signal that the power amplifier 40 is sent
The audio signal is sampled, and obtains echo sampled signal, and according to the echo sampled signal to the microphone array
10 current speech signals obtained carry out echo filter, obtain the targeted voice signal after filtering, realize to current speech signal
In the elimination of echo signal that includes, sound processing chip 20 described in the present embodiment can use model CX20921 voice
Chip, in practical application, the audio signal transmission mode between the sound processing chip 20 and the central processing unit 30 can
To be in a manner of I2S or pulse code modulation mode (Pulse Code Modulation, PCM).Certainly, specific audio
The selection of signal transmission form can be selected according to actual conditions, and this implementation is not any limitation as to this.
Current speech signal in the present embodiment in microphone array collection environment, and the current speech signal is transmitted
To sound processing chip, central processing unit obtains audio signal corresponding to audio to be played, and by the audio signal transmission extremely
Power amplifier, power amplifier send the audio signal to sound processing chip, and carry out letter to the audio signal
Number amplification obtain drive signal, the drive signal is transmitted to loudspeaker, so that the loudspeaker enters to the drive signal
Row is played, and sound processing chip is sampled to the audio signal received, obtains echo sampled signal, and according to the echo
Sampled signal carries out echo filter to the current speech signal, obtains targeted voice signal.In the present embodiment, due to being sampled
Audio signal and the drive signal of loudspeaker be all from power amplifier, so as to shorten audio signal sampling and voice letter
Number collection delay, improve the accuracy of echo cancellor, optimize Consumer's Experience.
Further, as shown in figure 3, proposing the second of voice signal echo cancelling device of the present invention based on first embodiment
Embodiment, in the present embodiment, the sound processing chip 20 also include：
Signal enhancing unit 201, for carrying out signal enhancing to the current speech signal received, obtain to be compared
Voice signal, signal enhancing is carried out to the echo sampled signal, obtains echo sampled signal to be compared；
It should be noted that the sound processing chip 20 is getting the current speech of the collection of microphone array 10
After the audio signal that signal and the power amplifier 40 transmit, the signal enhancing unit 201 in the sound processing chip 20
Signal enhancing processing can be carried out to the current speech signal and the audio signal respectively.
Further, since the audio signal that provides of the power amplifier 40 transmitted by the central processing unit 30 and
Come, therefore and need not only be needed to carrying out analog-to-digital conversion and filtering process for providing the audio signal of echo sampled signal
The audio signal to provide the power amplifier 40 is sampled, and obtains echo sampled signal, and to the echo
Sampled signal carries out signal enhancing, obtains echo sampled signal to be converted, the number of buffer described in the present embodiment is not
It is fixed, it can be set according to actual conditions.
Comparator 202, for carrying out echo to the voice signal to be compared according to the echo sampled signal to be compared
Filtering, obtain targeted voice signal.
Echo cancellor is carried out to the voice signal that microphone array 10 obtains to realize, the present embodiment is performed using comparator
Corresponding filter operation.
In the specific implementation, the comparator 202 by the voice signal to be filtered that normal phase input end receives with it is anti-phase defeated
Enter the echo sampled signal that end receives to be compared, export targeted voice signal, to realize the echo mistake to the voice signal
Filter, the targeted voice signal is the voice signal after echo filter.
In the present embodiment, the current speech signal and power amplifier that are gathered by signal enhancing unit to microphone array
The echo sampled signal of offer carries out signal enhancing respectively, then by the enhanced voice signal to be compared and described to be compared
Echo sampled signal is transmitted to the comparator, to the voice signal to be compared that gets and described is treated by the comparator
Compare echo sampled signal to be compared, export targeted voice signal, so as to reduce the workload of system for TV set, accelerate
The speed of targeted voice signal is obtained, improves Consumer's Experience.
Further, as shown in figure 4, proposing the of voice signal echo cancelling device of the present invention based on the various embodiments described above
Three embodiments, in the present embodiment, the sound processing chip 20 also include：
Level shifting circuit 203, for distinguishing the voice signal to be compared and the echo sampled signal to be compared
Level conversion is carried out, obtains the voice signal to be locked after conversion and echo sampled signal to be locked；And/or
Phase-locked loop circuit 204, for entering respectively to the voice signal to be locked and the echo sampled signal to be locked
Row PGC demodulation, obtain the voice signal to be divided after PGC demodulation and echo sampled signal to be divided；And/or
Frequency divider 205, for carrying out signal frequency split to the voice signal to be divided, to the echo sampling letter to be divided
Number carry out signal frequency split；
Correspondingly, the comparator 202, it is additionally operable to enter the echo sampled signal after the voice signal and frequency dividing after frequency dividing
Row echo filter, obtain targeted voice signal.
It should be noted that for lifting echo cancellor effect, ensure the degree of accuracy of speech recognition.Through signal in the present embodiment
201 enhanced voice signal of enhancement unit and audio signal also need to carry out level conversion by level shifting circuit 203, with
The voice signal after level conversion and each self-corresponding level signal of audio signal is set to be mutually matched in amplitude.
Further, as shown in figure 5, Fig. 5 is circuit theory diagrams corresponding to level shifting circuit.
Wherein, the first metal-oxide-semiconductor Q1 grid is connected with reference voltage U2, drain electrode and the letter of the first metal-oxide-semiconductor Q1
Number enhancement unit 201 connects, and receives voice signal MX to be compared, the source electrode of the first metal-oxide-semiconductor Q1 through a pull-up resistor R1 with
The reference voltage U2 connections, and the source electrode of the first metal-oxide-semiconductor Q1 is also defeated to the voice signal MXD progress after level conversion
Go out；
The grid of second metal-oxide-semiconductor is connected with reference voltage U2, drain electrode and the signal enhancing list of the second metal-oxide-semiconductor Q2
Member 201 connects, and receives echo sampled signal IX to be compared, the source electrode of the second metal-oxide-semiconductor Q2 through a pull-up resistor R2 with it is described
Reference voltage U2 connections, and the source electrode of the second metal-oxide-semiconductor Q2 is also defeated to the echo sampled signal IXD progress after level conversion
Go out.
In the specific implementation, the voice signal MXD that phase-locked loop circuit 204 receives the first metal-oxide-semiconductor Q1 outputs (is treated
Lock voice signal) and the second metal-oxide-semiconductor Q2 output echo sampled signal IXD (echo sampled signal i.e. to be locked) after, dock
The signal received carries out PGC demodulation respectively；Frequency divider 205 is again to the voice signal after PGC demodulation and echo sampled signal
Carry out scaling down processing.
It should be understood that the frequency divider 205 transmits the signal after frequency dividing to institute after scaling down processing is carried out to signal
Comparator 202 is stated, echo mistake is carried out to the echo sampled signal after the voice signal and frequency dividing after frequency dividing by the comparator 202
Filter, obtain targeted voice signal.
Logical-arithmetic unit 206, for carrying out logical operation process to the targeted voice signal, obtain voice letter to be modulated
Number；
Signal modulation unit 207, for carrying out signal modulation to the voice signal to be modulated, obtain efficient voice letter
Number, and the efficient voice signal is transmitted to the central processing unit 30.
Further to remove the noise included in the targeted voice signal or noise signal, sound described in the present embodiment
Process chip 20 also includes logical-arithmetic unit 206, and the logical-arithmetic unit 206 is right after the targeted voice signal is received
The targeted voice signal carries out logical operation process, removes the noise signal in the targeted voice signal, retains to be modulated
Voice signal, and by the transmitting voice signal to be modulated to signal modulation unit 207, so that the signal modulation unit 207
Signal modulation is carried out to the voice signal to be modulated, obtains efficient voice signal, and by the efficient voice signal transmit to
The central processing unit 30, the central processing unit 30 is after the efficient voice signal is received, and voice refers to corresponding to generation
Order, and perform the corresponding operation of the phonetic order.
Sound processing chip carries out level conversion, phase by the voice signal to getting and audio signal in the present embodiment
Position locking and/or scaling down processing, and the signal after processing is transmitted to comparator so as to obtain targeted voice signal, improve back
Sound eradicating efficacy, while logical operation process is carried out to the targeted voice signal, remove making an uproar in the targeted voice signal
Acoustical signal, make echo cancellor more accurate, greatly reduce voice noise of the output to central processing unit, ensure that speech recognition
The degree of accuracy.
Further, as shown in fig. 6, proposing the of voice signal echo cancelling device of the present invention based on the various embodiments described above
Four embodiments, to ensure that echo cancellor is more efficient, the degree of accuracy of speech recognition is improved, in the present embodiment the acoustic processing
Chip 20 also includes：
Sampling unit 208, for carrying out analog-to-digital conversion to the current speech signal, and the voice signal after conversion is entered
Row digital sample；
In this embodiment, the sampling unit 208 is receiving analog signal (the i.e. current language of the transmission of microphone array 10
Sound signal) when, the analog signal can be converted to corresponding data signal, and the data signal is sampled.
Wave filter 209, for being filtered processing to the voice signal after progress digital sample, obtain filtered voice
Signal, and filtered signal is transmitted to the signal enhancing unit 201.
In practical situations both, the noise that the voice signal that microphone array 10 obtains may include various different frequencies is believed
Number, can be by the wave filter 209 to carrying out digital sample to reduce influence or interference of these noise signals to echo cancellor
Voice signal afterwards is filtered processing, filters out the noise signal for being unsatisfactory for predeterminated frequency, and by filtered voice signal
Transmit to the signal enhancing unit 201.
In the present embodiment, microphone is to simulate microphone, the simulation Mike used by the microphone array 10
The current speech signal of elegance collection carries out analog-to-digital conversion by the sampling unit 208, and carries out digital sample, the number after sampling
Word signal is filtered processing through the wave filter 209, then carries out signal enhancing via the signal enhancing unit 201, obtains
The voice signal to be compared；Likewise, the echo sampled signal provided by the power amplifier 40 is through the signal enhancing
Unit 201 carries out signal enhancing, obtains the echo sampled signal to be compared.
Wherein, the level shifting circuit 203 is receiving the voice signal to be compared and the echo to be compared takes
After sample signal, level conversion is carried out respectively to the two paths of signals received, the phase-locked loop circuit 204 is again to after level conversion
Signal carry out PGC demodulation respectively, and the signal after PGC demodulation is sent to the frequency divider 205, the frequency divider 205
Carry out scaling down processing respectively to the signal after PGC demodulation, and the signal after frequency dividing is sent to the comparator 202, the ratio
The signal received is compared again compared with device 202, obtains targeted voice signal, the described targeted voice signal is in logical operation
Voice signal to be modulated is obtained under the calculating of device 206, the voice signal to be modulated carries out signal by signal modulation unit 207
Modulation, obtains efficient voice signal, and the efficient voice signal is exported in a manner of I2S to the central processing unit 30.In addition, institute
State logical-arithmetic unit 206 also to send the voice signal to be modulated to the level shifting circuit 203, so that the level turns
Change circuit 203 and level conversion is carried out to the voice signal of receipt of subsequent according to the voice signal to be modulated.
Because the echo sampled signal is directly provided by the power amplifier in the present embodiment, and the microphone array
Row are arranged near loudspeaker, therefore the echo sampled signal and the current speech signal of microphone array collection
Be delayed very little, in real process, can be controlled in substantially within 5 milliseconds, makes echo cancellor more accurate, greatly reduces output
To the voice noise of central processing unit, the degree of accuracy of speech recognition ensure that.
Further, as shown in fig. 7, proposing the of voice signal echo cancelling device of the present invention based on the various embodiments described above
Five embodiments, in the present embodiment, described device also includes：
Memory cell 50, the operational data sent for receiving the logical-arithmetic unit, and the budget data is carried out
Storage；
In the present embodiment, memory cell 50, can be by the fortune after the operational data of the transmission of logical-arithmetic unit 206 is received
Calculate data Cun Chudao local storage spaces.
Loudspeaker 60, sound letter is converted into for the drive signal of receiving power amplifier transfer, and by the drive signal
Number, listened to for user.
It should be noted that the loudspeaker 60 in the present embodiment can not be the sound processing chip in power amplifier 40
Can directly be the acoustic processing core when 20 offer audio signals are for the sound processing chip 20 progress echo signal sampling
Piece 20 provides acoustical signal, analog-to-digital conversion is carried out to the acoustical signal by sound processing chip 20, then to the letter after analog-to-digital conversion
Number carry out echo signal sampling, obtain echo sampled signal.
Loudspeaker in the present embodiment can not provide the sampling for doing echo cancellor in power amplifier for sound processing chip
During signal, acoustical signal is supplied to the sound processing chip, turned so that sound processing chip carries out modulus to the acoustical signal
Change, echo signal sampling then is carried out to the signal after analog-to-digital conversion, obtain echo sampled signal, ensure that echo sampled signal
Smooth sampling.
In addition, the present invention also provides a kind of television set, the television set includes above-mentioned voice signal echo cancelling device, institute
Concrete operating principle and application of the predicate sound signal echo cancelling device in the television set can refer to various embodiments above, this
Place repeats no more.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property includes, so that process, method, article or system including a series of elements not only include those key elements, and
And also include the other key elements being not expressly set out, or also include for this process, method, article or system institute inherently
Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this
Other identical element also be present in the process of key element, method, article or system.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on such understanding, technical scheme is substantially done to prior art in other words
Going out the part of contribution can be embodied in the form of software product, and the computer software product is stored in a storage medium
In (such as ROM/RAM, magnetic disc, CD), including some instructions to cause a station terminal equipment (can be mobile phone, computer, clothes
Be engaged in device, air conditioner, or network equipment etc.) perform method described in each embodiment of the present invention.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of voice signal echo cancelling device, it is characterised in that described device includes：Microphone array, central processing unit,
Power amplifier and sound processing chip；
The microphone array, transmitted for gathering the current speech signal in environment, and by the current speech signal to institute
State sound processing chip；
The central processing unit, for obtaining audio signal corresponding to audio to be played, and by the audio signal transmission to institute
State power amplifier；
The power amplifier, for the audio signal to be sent to the sound processing chip, and to the audio signal
Carry out signal amplification and obtain drive signal, the drive signal is transmitted to loudspeaker, so that the loudspeaker is to the driving
Signal plays out；
The sound processing chip, for being sampled to the audio signal received, echo sampled signal is obtained, and according to institute
State echo sampled signal and echo filter is carried out to the current speech signal, targeted voice signal is obtained, to realize echo cancellor.
2. device as claimed in claim 1, it is characterised in that the sound processing chip includes：
Signal enhancing unit, for carrying out signal enhancing to the current speech signal received, obtain voice letter to be compared
Number, signal enhancing is carried out to the echo sampled signal, obtains echo sampled signal to be compared；
Comparator, for carrying out echo filter to the voice signal to be compared according to the echo sampled signal to be compared, obtain
Obtain targeted voice signal.
3. device as claimed in claim 2, it is characterised in that the sound processing chip also includes：
Sampling unit, numeral is carried out for carrying out analog-to-digital conversion to the current speech signal, and to the voice signal after conversion
Sampling；
Wave filter, for being filtered processing to the voice signal after progress digital sample, filtered voice signal is obtained, and
Filtered signal is transmitted to the signal enhancing unit.
4. device as claimed in claim 3, it is characterised in that the sound processing chip also includes：
Level shifting circuit, for entering line level respectively to the voice signal to be compared and the echo sampled signal to be compared
Conversion, obtain the voice signal to be locked after conversion and echo sampled signal to be locked；And/or
Phase-locked loop circuit, for carrying out phase lock respectively to the voice signal to be locked and the echo sampled signal to be locked
It is fixed, obtain the voice signal to be divided after PGC demodulation and echo sampled signal to be divided；And/or
Frequency divider, for carrying out signal frequency split to the voice signal to be divided, the echo sampled signal to be divided is carried out
Signal frequency split；
Correspondingly, the comparator, it is additionally operable to carry out echo to the echo sampled signal after the voice signal and frequency dividing after frequency dividing
Filtering, obtain targeted voice signal.
5. device as claimed in claim 4, it is characterised in that the comparator, be additionally operable to the language for receiving normal phase input end
Sound signal exports targeted voice signal compared with the echo sampled signal that inverting input receives, to realize to institute's predicate
The echo filter of sound signal.
6. device as claimed in claim 5, it is characterised in that the sound processing chip, in addition to：
Logical-arithmetic unit, for carrying out logical operation process to the targeted voice signal, obtain voice signal to be modulated；
Signal modulation unit, for carrying out signal modulation to the voice signal to be modulated, obtain efficient voice signal, and by institute
Efficient voice signal is stated to transmit to the central processing unit.
7. device as claimed in claim 6, it is characterised in that the signal modulation unit, specifically for described to be modulated
Voice signal carries out signal modulation, and enters row format conversion to the voice signal after modulation, obtains efficient voice signal, and by institute
Efficient voice signal is stated to transmit to the central processing unit.
8. device as claimed in claim 7, it is characterised in that the logical-arithmetic unit, be additionally operable to the voice to be modulated
Signal is sent to the level shifting circuit so that the level shifting circuit according to the voice signal to be modulated to rear continued access
The voice signal of receipts carries out level conversion.
9. the device as described in any one of claim 1~8, it is characterised in that described device also includes：
Memory cell, the operational data sent for receiving the logical-arithmetic unit, and the budget data is stored.
10. a kind of television set, it is characterised in that the television set includes the voice described in claim 1 to 9 any claim
Signal echo cancelling device.
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| CN201710729498.9A CN107452395B (en) | 2017-08-23 | 2017-08-23 | Voice signal echo cancellation device and television |
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| CN201710729498.9A CN107452395B (en) | 2017-08-23 | 2017-08-23 | Voice signal echo cancellation device and television |
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| CN108235189A (en) * | 2018-02-07 | 2018-06-29 | 深圳创维－Rgb电子有限公司 | The echo cancelling device and television set of a kind of voice signal |
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