CN109274848A - Full duplex talkback unit and cat eye device - Google Patents
Full duplex talkback unit and cat eye device Download PDFInfo
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- CN109274848A CN109274848A CN201811392486.2A CN201811392486A CN109274848A CN 109274848 A CN109274848 A CN 109274848A CN 201811392486 A CN201811392486 A CN 201811392486A CN 109274848 A CN109274848 A CN 109274848A
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- 241000282326 Felis catus Species 0.000 title claims abstract description 12
- 238000004891 communication Methods 0.000 claims description 14
- 230000005236 sound signal Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims 1
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 239000011022 opal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
-
- 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
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
- H04Q5/24—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange for two-party-line systems
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computational Linguistics (AREA)
- Quality & Reliability (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Telephone Function (AREA)
Abstract
The embodiment of the invention discloses a kind of full duplex talkback unit and cat eye devices, wherein, the full duplex talkback unit includes the first voice acquisition device, the second voice acquisition device, the first playing device, the second playing device, the first speech processing chip and the second speech processing chip；First voice acquisition device is connect with the first speech processing chip, and the first playing device is connect with the first speech processing chip；Second voice acquisition device is connect with the second speech processing chip, and the second playing device is connect with the second speech processing chip；First speech processing chip is connect with the second speech processing chip.Echo and noise in two-way call can be greatly reduced by the first speech processing chip and the second speech processing chip, greatly improves the usage experience of user.
Description
Technical field
The present invention relates to talk back equipment technical field more particularly to a kind of full duplex talkback units and cat eye device.
Background technique
Intelligent peephole occupies an important seat as intelligent household electronic equipment in safety product of registering one's residence.Traditional opal
Only be mounted with a lens on door, thus user can only side indoors, moved close to opal observation outdoor situations with eyes.And intelligence
Can opal then can in outdoor mounted infrared camera and loudspeaker, microphone and doorbell key, indoor location show screen and
Loudspeaker, microphone are also equipped with the wireless WIFI router feature of connection, long-range APP are allowed to access.
User uses intelligent peephole, can not only see outdoor situation clearly indoors, can also carry out intercommunication with visitor and answer
It answers.Householder user in the local intercommunication of Men Nei and visitor outdoors, more mostly half-duplex intercommunication mode, i.e., householder or visitor's needs with
The modes such as key constantly switch voice pathway direction, and a side, which finishes one section of release access another party and could obtain access, then to be said
Words.So complicated mode of operation greatly reduces user experience, and more allow the raw dislike of many user's hearts is in call
Echo and noise cannot effectively eliminate, and lead to the howling for often hearing that unintelligible speech is even ear-piercing.
Summary of the invention
The technical problem to be solved is that how to provide a kind of low noise and hypoechoic full duplex for the embodiment of the present invention
Talkback unit.
In a first aspect, the embodiment of the present invention proposes a kind of full duplex talkback unit, the full duplex talkback unit includes the
One voice acquisition device, the second voice acquisition device, the first playing device, the second playing device, the first speech processing chip with
And second speech processing chip；First voice acquisition device and first playing device with first speech processes
Chip connection；Second voice acquisition device and second playing device are connect with second speech processing chip；
First speech processing chip is connect with second speech processing chip,
Wherein, first speech processing chip be used for the first voice acquisition device audio signal collected into
Row acoustic echo is eliminated with output after noise suppressed processing to the second speech processing chip, and by second speech processing chip
It is exported by second playing device；Second speech processing chip is used for the second voice acquisition device sound collected
Frequency signal carries out acoustic echo and eliminates with output after noise suppressed processing to the first speech processing chip, and by first voice
Chip is handled to export by first playing device.
Its further technical solution is, first speech processing chip includes the first voice signal input pin, the
Two voice signal input pins, the first voice signal output pin and the second voice signal output pin, second voice
Processing chip include third voice signal input pin, the 4th voice signal input pin, third voice signal output pin with
And the 4th voice signal output pin；
First voice acquisition device is connect with the first voice signal input pin, and first voice signal is defeated
Pin is connect with the 4th voice signal input pin out, and the second voice signal output pin and described first plays dress
Set connection；Second voice acquisition device is connect with the third voice signal input pin, and the 4th voice signal is defeated
Pin is connect with the second voice signal input pin out, and the third voice signal output pin and described second plays dress
Set connection.
Its further technical solution is that the full duplex talkback unit further includes master chip and communication module；
Wherein, the communication module with user terminal for being communicatively coupled；The master chip and the communication module
It is connected with first speech processing chip, the language for being exported first speech processing chip by the communication module
Sound signal is sent to user terminal, and the voice signal that the user terminal inputs is sent to the first speech processes core
Piece.
Its further technical solution is that the master chip includes that the 5th voice signal input pin and the 6th voice are believed
Number input pin, the 5th voice signal input pin are connect with the first voice signal output pin, the 6th language
Sound signal input pin is connect with the 4th voice signal output pin.
Its further technical solution is that the full duplex talkback unit further includes analog switch, the analog switch packet
Include an input terminal, two output ends and a control terminal；The master chip further includes the 5th voice signal output pin；The simulation
The input terminal of switch is connect with the second voice signal input pin, and two output ends of the analog switch are respectively with described
Four voice signal output pins and the connection of the 5th voice signal output pin；The control terminal of the analog switch and the main core
Piece connection.
Its further technical solution is that the full duplex talkback unit further includes memory, the memory with it is described
Master chip connection, wherein the master chip can be by first speech processing chip/second speech processing chip input
Voice signal is converted to recording file and stores in the memory.
Its further technical solution is that the master chip includes the 6th voice signal output pin, the 6th voice
Signal output pin is connect with second playing device.
Its further technical solution is that first speech processing chip and second speech processing chip are
FM1288 chip.
Its further technical solution is that first voice acquisition device and second voice acquisition device wrap
Include microphone；First playing device and second playing device include power amplifier and loudspeaker.
Second aspect, the embodiment of the present invention propose that a kind of cat eye device, the cat eye device include that first aspect such as proposes
Full duplex talkback unit.
In technical solution of the present invention, audio signal that the first speech processing chip enrolls the first voice acquisition device into
Row acoustic echo is eliminated with after noise suppressed processing, and output is led to the second speech processing chip, and by the second speech processing chip
Cross the second playing device output sound；The audio signal carry out sound that second speech processing chip enrolls the second voice acquisition device
After learning echo cancellor and noise suppressed processing, export to the first speech processing chip, and pass through the by the first speech processing chip
One playing device exports sound.It can be greatly reduced by the first speech processing chip and the second speech processing chip two-way
Echo and noise in call, greatly improve the usage experience of user.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram for full duplex talkback unit that the embodiment of the present invention proposes；
Fig. 2 is a kind of structural schematic diagram for full duplex talkback unit that another embodiment of the present invention proposes；And
Fig. 3 is a kind of schematic block diagram for cat eye device that the embodiment of the present invention proposes.
Appended drawing reference
Cat eye device 10；Full duplex talkback unit 100；First voice acquisition device 1；Second voice acquisition device 2；First
Playing device 3；Second playing device 4；First speech processing chip 5；First voice signal input pin 51；Second voice signal
Input pin 52；First voice signal output pin 53；Second voice signal output pin 54；Second speech processing chip 6；The
Three voice signal input pins 61；4th voice signal input pin 62；Third voice signal output pin 63；4th voice letter
Number output pin 64；Master chip 71；5th voice signal input pin 711；5th voice signal output pin 712；6th language
Sound signal input pin 713；6th voice signal output pin 714；Communication module 72；Memory 73；Analog switch 8；Input
End 81；Output end 82 and control terminal 83.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, is clearly and completely retouched to the technical solution in embodiment
It states, similar reference numerals represent similar component in attached drawing.Obviously, will be described below embodiment is only the present invention one
Divide embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
Every other embodiment obtained, shall fall within the protection scope of the present invention under the premise of creative work.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, the presence or addition of element, component and/or its set.
It is also understood that in this embodiment of the present invention term used in the description merely for the sake of description particular implementation
Example purpose and be not intended to limit the embodiment of the present invention.Such as the institute in specification and appended book of the embodiment of the present invention
As use, other situations unless the context is clearly specified, otherwise " one " of singular, "one" and "the" are intended to wrap
Include plural form.
Referring to Fig. 1, the embodiment of the present invention proposes a kind of full duplex talkback unit 100, as shown in Figure 1, the full duplex intercommunication
Device 100 includes the first voice acquisition device 1, the second voice acquisition device 2, the first playing device 3, the second playing device 4, the
One speech processing chip 5 and the second speech processing chip 6.
Referring to Fig. 1, the first voice acquisition device 1 is connect with the first speech processing chip 5, the first playing device 3 and first
Speech processing chip 5 connects；Second voice acquisition device 2 is connect with the second speech processing chip 6, the second playing device 4 and
The connection of two speech processing chips 6；First speech processing chip 5 is connect with the second speech processing chip 6.
In technical solution of the present invention, audio signal that the first speech processing chip 5 enrolls the first voice acquisition device 1
It carries out acoustic echo to eliminate with after noise suppressed processing, export to the second speech processing chip 6, and by the second speech processing chip
6 export sound by the second playing device 4；The audio signal that second speech processing chip 6 enrolls the second voice acquisition device 2
It carries out acoustic echo to eliminate with after noise suppressed processing, export to the first speech processing chip 5, and by the first speech processing chip
5 export sound by the first playing device 3.It can be very big by the first speech processing chip 5 and the second speech processing chip 6
Ground reduces echo and noise in two-way call, greatly improves the usage experience of user.
Referring to fig. 2, in one embodiment, first speech processing chip 5 include the first voice signal input pin 51,
Second voice signal input pin 52, the first voice signal output pin 53 and the second voice signal output pin 54.It is described
Second speech processing chip 6 includes third voice signal input pin 61, the 4th voice signal input pin 62, third voice letter
Number output pin 63 and the 4th voice signal output pin 64.
First voice acquisition device 1 and the first voice signal input pin 51 with connect, first voice
Signal output pin 53 is connect with the 4th voice signal input pin 62, the second voice signal output pin 54 and institute
State the connection of the first playing device 3.Second voice acquisition device 2 is connect with the third voice signal input pin 61, institute
It states the 4th voice signal output pin 64 to connect with the second voice signal input pin 52, the third voice signal output
Pin 63 is connect with second playing device 4.
Further, the full duplex talkback unit 100 further include analog switch 8, master chip 71, communication module 72 and
Memory 73.The master chip 71 includes the 5th voice signal input pin 711, the 5th voice signal output pin the 712, the 6th
Voice signal input pin 713, the 6th voice signal output pin 714.The analog switch 8 includes that an input terminal 81, two is defeated
Outlet 82 and a control terminal 83.The master chip 71 is connect with the communication module 72 and memory 73 respectively.
The communication module 72 with user terminal for being communicatively coupled.One side master chip 71 passes through communication module 72
The voice signal that first speech processing chip 5 exports is sent to user terminal, on the other hand, master chip 71 passes through communication module
The voice signal of user terminal input is sent to the first speech processing chip 5 by 72, to realize long-range full duplex call.
Further, the 5th voice signal input pin 711 is connect with the first voice signal output pin 53；
The 6th voice signal input pin 714 is connect with the 4th voice signal output pin 64.The master chip 71 can incite somebody to action
First speech processing chip 5 or the voice signal of second speech processing chip 6 input are converted to recording file simultaneously
It is stored in the memory 73, to realize sound-recording function.
Further, the master chip 71 includes the 6th voice signal output pin 714, the 6th voice signal output
Pin 714 is connect with second playing device 4.Master chip 71 passes through the 6th voice signal output pin 714 for ringing signal
It is sent to the second playing device 4, to realize indoor the tinkle of bells playing function.Ringing signal is sent to the first voice by master chip 71
Chip 5 is handled, and ringing signal is sent to the first playing device 3 by the first speech processing chip 5, to realize outdoor the tinkle of bells
Playing function.
Further, the input terminal 81 of the analog switch 8 is connect with the second voice signal input pin 52, described
Two output ends 82 of analog switch 8 respectively with the 4th voice signal output pin 64 and the 5th voice signal output pin
712 connections, the control terminal 83 of the analog switch 8 are connect with the master chip 71.
The wiring of the second voice signal input pin 52 is allowed hand over by the analog switch 8；In the second voice signal
For input pin 52 when the 4th voice signal output pin 64 connects, the first speech processing chip 5 receives the second speech processes core
The audio signal that piece 6 issues, is achieved in short range full duplex call；Believe in the second voice signal input pin 52 in the 5th voice
When number output pin 712 connects, the first speech processing chip 5 receives the audio signal that master chip 71 issues, and is achieved in long-range
Full duplex call.
The control terminal 83 of analog switch 8 is connect with the master chip 71, so that user can be by user terminal to master chip
71 send control signal, and master chip 71 controls the connection status of analog switch 8 according to the control signal, to realize that short range is entirely double
The switching of work and long-range full duplex call.
In one embodiment, first speech processing chip 5 and the second speech processing chip 6 are that rich enlightening science and technology has
Limit the System on Chip/SoC that company model is FM1288.The System on Chip/SoC of model FM1288 integrates digital signal processing hardware and accelerates
The modules such as device (DSP), RAM and ROM and multichannel differentiated voice input and output ADC/DAC, can be adjusted by IIC Interface Controller
Speech parameters, it is natural in the reservation of noisy environment utmost sharpness to adjust the acoustic echo of removal ambient noise
Sound.
In one embodiment, the first voice acquisition device 1 and the second voice acquisition device 2 include microphone；First
Playing device 3 and the second playing device 4 include power amplifier and loudspeaker.Power amplifier is connect with loudspeaker.
Referring to Fig. 3, the embodiment of the present invention proposes a kind of cat eye device 10, as seen from the figure, more than which includes
The full duplex talkback unit 100 that embodiment proposes.
The cat eye device 10 further includes other other structures that can be realized 10 basic function of cat eye device, the above opal dress
It sets 10 other structures to be well known to the skilled person, details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in some embodiment
Part, reference can be made to the related descriptions of other embodiments.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, the even these modifications and changes of the present invention range that belongs to the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
The above is a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, any ripe
It knows those skilled in the art in the technical scope disclosed by the present invention, various equivalent modifications can be readily occurred in or replaces
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection scope subject to.
Claims (10)
1. a kind of full duplex talkback unit, which is characterized in that the full duplex talkback unit includes the first voice acquisition device, the
Two voice acquisition devices, the first playing device, the second playing device, the first speech processing chip and the second speech processes core
Piece；First voice acquisition device and first playing device are connect with first speech processing chip；Described
Two voice acquisition devices and second playing device are connect with second speech processing chip；First speech processes
Chip is connect with second speech processing chip,
Wherein, first speech processing chip is used for first voice acquisition device audio signal carry out sound collected
It exports after echo cancellor and noise suppressed processing and passes through to the second speech processing chip, and by second speech processing chip
The second playing device output；Second speech processing chip is used to believe second voice acquisition device audio collected
Number carry out acoustic echo eliminate and noise suppressed processing after output to the first speech processing chip, and by first speech processes
Chip is exported by first playing device.
2. full duplex talkback unit according to claim 1, which is characterized in that first speech processing chip includes the
One voice signal input pin, the second voice signal input pin, the first voice signal output pin and the second voice signal
Output pin, second speech processing chip include third voice signal input pin, the 4th voice signal input pin,
Three voice signal output pins and the 4th voice signal output pin；
First voice acquisition device is connect with the first voice signal input pin, and the first voice signal output is drawn
Foot is connect with the 4th voice signal input pin, and the second voice signal output pin and first playing device connect
It connects；Second voice acquisition device is connect with the third voice signal input pin, and the 4th voice signal output is drawn
Foot is connect with the second voice signal input pin, and the third voice signal output pin and second playing device connect
It connects.
3. full duplex talkback unit according to claim 1, which is characterized in that the full duplex talkback unit further includes master
Chip and communication module；
Wherein, the communication module with user terminal for being communicatively coupled；The master chip and the communication module and institute
The connection of the first speech processing chip is stated, the voice for exporting first speech processing chip by the communication module is believed
Number it is sent to user terminal, and the voice signal that the user terminal inputs is sent to first speech processing chip.
4. full duplex talkback unit according to claim 3, which is characterized in that the master chip includes the 5th voice signal
Input pin and the 6th voice signal input pin, the 5th voice signal input pin and first voice signal are defeated
Pin connects out, and the 6th voice signal input pin is connect with the 4th voice signal output pin.
5. full duplex talkback unit according to claim 4, which is characterized in that the full duplex talkback unit further includes mould
Quasi- switch, the analog switch include an input terminal, two output ends and a control terminal；The master chip further includes the 5th voice
Signal output pin；The input terminal of the analog switch is connect with the second voice signal input pin, the analog switch
Two output ends connect respectively with the 4th voice signal output pin and the 5th voice signal output pin；The simulation
The control terminal of switch is connect with the master chip.
6. full duplex talkback unit according to claim 4, which is characterized in that the full duplex talkback unit further includes depositing
Reservoir, the memory are connect with the master chip, wherein the master chip can be by first speech processing chip/described
The voice signal of second speech processing chip input is converted to recording file and stores in the memory.
7. full duplex talkback unit according to claim 3, which is characterized in that the master chip includes the 6th voice signal
Output pin, the 6th voice signal output pin are connect with second playing device.
8. full duplex talkback unit according to claim 1, which is characterized in that first speech processing chip and described
Second speech processing chip is FM1288 chip.
9. full duplex talkback unit according to claim 1, which is characterized in that first voice acquisition device and institute
Stating the second voice acquisition device includes microphone；First playing device and second playing device include power
Amplifier and loudspeaker.
10. a kind of cat eye device, which is characterized in that the cat eye device includes as claim 1-9 is described in any item complete double
Work talkback unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811392486.2A CN109274848A (en) | 2018-11-21 | 2018-11-21 | Full duplex talkback unit and cat eye device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811392486.2A CN109274848A (en) | 2018-11-21 | 2018-11-21 | Full duplex talkback unit and cat eye device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109274848A true CN109274848A (en) | 2019-01-25 |
Family
ID=65190469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811392486.2A Pending CN109274848A (en) | 2018-11-21 | 2018-11-21 | Full duplex talkback unit and cat eye device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109274848A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112201268A (en) * | 2020-09-09 | 2021-01-08 | 北京小米松果电子有限公司 | Echo cancellation method, echo cancellation device, and storage medium |
| CN112637438A (en) * | 2020-12-17 | 2021-04-09 | 中科上声（苏州）电子有限公司 | Single-line transmission-based entrance guard double-end intercom method and system |
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| CN205566512U (en) * | 2016-03-02 | 2016-09-07 | 珠海富景科技有限公司 | Visual doorbell system that talkbacks of intelligence |
| CN106375881A (en) * | 2016-10-09 | 2017-02-01 | 深圳来邦科技有限公司 | Full-duplex window intercom system |
| US9774966B1 (en) * | 2016-06-13 | 2017-09-26 | Wahsega Labs LLC | Multi-speaker control from single smart master speaker |
| CN206686379U (en) * | 2017-04-21 | 2017-11-28 | 深圳市海恒通科技有限公司 | A kind of full duplex intercommunication accessory |
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| EP2784778A1 (en) * | 2013-03-28 | 2014-10-01 | Fujitsu Limited | Sound echo canceling in case of rate-of-speech change |
| CN205566512U (en) * | 2016-03-02 | 2016-09-07 | 珠海富景科技有限公司 | Visual doorbell system that talkbacks of intelligence |
| US9774966B1 (en) * | 2016-06-13 | 2017-09-26 | Wahsega Labs LLC | Multi-speaker control from single smart master speaker |
| CN106375881A (en) * | 2016-10-09 | 2017-02-01 | 深圳来邦科技有限公司 | Full-duplex window intercom system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112201268A (en) * | 2020-09-09 | 2021-01-08 | 北京小米松果电子有限公司 | Echo cancellation method, echo cancellation device, and storage medium |
| CN112637438A (en) * | 2020-12-17 | 2021-04-09 | 中科上声（苏州）电子有限公司 | Single-line transmission-based entrance guard double-end intercom method and system |
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Application publication date: 20190125 |
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| RJ01 | Rejection of invention patent application after publication |