CN204244283U - There is intercom system and the elevator Internet of things system of echo cancellation function - Google Patents
There is intercom system and the elevator Internet of things system of echo cancellation function Download PDFInfo
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- CN204244283U CN204244283U CN201420796652.6U CN201420796652U CN204244283U CN 204244283 U CN204244283 U CN 204244283U CN 201420796652 U CN201420796652 U CN 201420796652U CN 204244283 U CN204244283 U CN 204244283U
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Abstract
The utility model discloses a kind of intercom system and the elevator Internet of things system with echo cancellation function, comprise in background server and elevator with the intercom of background server speech talkback, intercom comprise communication module, central processing unit, audio decoder, output downlink voice loud speaker, gather microphone, the echo filtering circuit of ascending voice, the output of echo filtering circuit and microphone, the output of loud speaker, the input of audio decoder are connected; The output of audio decoder is connected to the input of loud speaker; Audio decoder, central processing unit, communication module connect successively, and communication module is connected with background service end communication; Echo filtering circuit can be determined and export the analog signal corresponding to real passenger's voice, this analog signal is sent to central processing unit and directly carries out analog-to-digital conversion, can not be too much take central processing unit resource, and sound channel determination estimated echo need not be taken when microphone image data, export tonequality Quality advance.
Description
Technical field
The utility model relates to Internet of Things field, more particularly, relates to a kind of intercom system and the elevator Internet of things system with echo cancellation function.
Background technology
Internet of Things is mainly for detection of the operation of elevator, need when Lift out of order to report elevator Internet of Things background system, when an error occurs, the operator on duty of Internet of Things background system directly can carry out speech talkback by the form of long-range intercommunication with the passenger being trapped in elevator interior, the flow chart of data processing figure of speech talkback model as shown in Figure 1:
Sound is up, and audio decoder passes to central processing unit (CPU) after the voice signal that microphone (MIC) collects is carried out analog-to-digital conversion, sends to backstage Internet of things system after CPU deal with data by communication module.Sound is descending, and the voice data of backstage Internet of things system passes to CPU by communication module, passes to audio decoder and do digital-to-analogue conversion after CPU process, then drives loud speaker sounding.Because the downlink voice exported from loud speaker has time delay echo in elevator, this echo is likely collected by microphone and is uploaded together with the real speech of passenger.Therefore, be necessary to eliminate the echo of mixing in ascending voice, to ensure the quality of voice dialogue.
The method of the echo of current elimination downlink voice is: the voice collecting of microphone uses left and right dual track, on the one hand, by the data that R channel preservation current speaker is being play, this is realized by driver of sound card, a frame often broadcast by sound card, just back up in the buffer area of R channel, the data in such R channel are exactly the current data play, and calculate estimated echo according to these data; On the other hand, adopt L channel to preserve the image data of microphone, image data comprises near-end speech input x (n) and echo data r (n) from loud speaker.The differences such as echo data r (n) superposed in image data is identical with data frequency in R channel, amplitude, there is correlation, as long as utilize the AEC echo cancellation part of the speech coders such as speex, eliminate according to the estimated echo that R channel obtains echo data r (n) superposed in image data, effectively can reach the effect of echo cancellation.
Software is needed to make relevant anticipation to estimated echo in the process of this kind of speech talkback, this estimated echo is the unconverted digital signal for analog signal, CPU is by the elimination of algorithm realization echo, therefore very large to the resource consumption of CPU, microphone occupies a sound channel when gathering this estimated echo, cause exporting tonequality poor.
Utility model content
The technical problems to be solved in the utility model is, above-mentioned software algorithm for prior art eliminate echo take cpu resource very large, gather estimated echo and take sound channel and cause exporting the poor defect of tonequality, a kind of intercom system and the elevator Internet of things system with echo cancellation function are provided.
The utility model solves the technical scheme that its technical problem adopts: construct a kind of intercom system with echo cancellation function, comprise background server and be arranged on realizing and the intercom of described background server speech talkback via elevator Internet of Things in elevator, wherein, described intercom comprises communication module, central processing unit, audio decoder, the loud speaker of output downlink voice, the microphone gathering ascending voice and echo filtering circuit
Described echo filtering circuit is connected with the output of described microphone, the output of described loud speaker, the input of audio decoder respectively; The output of described audio decoder is connected to the input of described loud speaker; Described audio decoder, central processing unit, communication module connect successively, and described communication module is connected with background service end communication;
Described echo filtering circuit is used for the echo of the downlink voice mixed in ascending voice according to the downlink voice filtering gathered to determine and to export the analog signal corresponding to real passenger's voice; Described audio decoder comprises AD conversion unit and D/A conversion unit, and the output of described echo filtering circuit is connected to central processing unit via described AD conversion unit, described central processing unit is connected to the input of loud speaker via described D/A conversion unit; Described central processing unit performs the compression and decompression of data; Described background server is used for sending downlink voice to described central processing unit by described communication module and carries out processing and receive the voice after central processing unit process.
The intercom system with echo cancellation function described in the utility model, wherein, described echo filtering circuit comprises echo process chip.Preferably, the model of described echo process chip is FM1188.
Preferably, described audio decoder comprises WM9713 sound card.
Preferably, described central processing unit comprises Samsung S5PV210 processor.
Preferably, described communication module emerging MF210 module in comprising.
The invention also discloses and a kind ofly comprise the described elevator Internet of things system with the intercom system of echo cancellation function.
Implement intercom system and the elevator Internet of things system with echo cancellation function of the present utility model, there is following beneficial effect: the utility model sets up echo filtering circuit, it directly can gather the analog signal of the downlink voice that loud speaker exports, and the echo of the downlink voice mixed in ascending voice according to this analog signal filtering, and then can determine and export the analog signal corresponding to real passenger's voice, this analog signal can be sent to central processing unit and directly carry out analog-to-digital conversion, that is ascending voice had eliminated echo wherein before carrying out analog-to-digital conversion, therefore can not be too much take central processing unit resource, and the utility model need not take sound channel determination estimated echo when microphone image data, therefore tonequality Quality advance is exported.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the flow chart of data processing figure of the speech talkback model in prior art in elevator Internet of things system;
Fig. 2 is the structural representation that the utility model has the intercom system of echo cancellation function.
Embodiment
In order to there be understanding clearly to technical characteristic of the present utility model, object and effect, now contrast accompanying drawing and describe embodiment of the present utility model in detail.
With reference to figure 2, it is the structural representation that the utility model has the intercom system of echo cancellation function;
Intercom system of the present utility model is applied to elevator Internet of Things to realize the speech talkback of passenger in background work personnel and elevator, comprise background server 1 and be arranged on and realize the intercom with described background server 1 speech talkback via elevator Internet of Things in elevator, described intercom comprises communication module 2, central processing unit 3, audio decoder 4, the loud speaker exporting downlink voice, the microphone gathering ascending voice and echo filtering circuit 5
Described echo filtering circuit 5 is connected with the output of the output of described microphone, described loud speaker, the input of audio decoder 4 respectively; The output of described audio decoder 4 is connected to the input of described loud speaker; Described audio decoder 4, central processing unit 3, communication module 2 connect successively, and described communication module 2 is connected with background server 1 communication.Wherein, it can be that wire communication connects that communication module 2 is connected with the communication of background server 1, also can wireless telecommunications connect.
The analog signal of the ascending voice that described echo filtering circuit 5 gathers for the described downlink voice and microphone gathering loud speaker output, and the echo of the downlink voice mixed in ascending voice according to the analog signal filtering of downlink voice is to determine and to export the analog signal corresponding to real passenger's voice; Described audio decoder 4 comprises AD conversion unit and D/A conversion unit, and the output of described echo filtering circuit 5 is connected to central processing unit 3 via described AD conversion unit, described central processing unit 3 is connected to the input of loud speaker via described D/A conversion unit; Described background server 1 carries out processing and receive the voice after central processing unit 3 processes for being sent downlink voice to described central processing unit 3 by described communication module 2.
In preferred embodiment, described audio decoder 4 comprises WM9713 sound card, and central processing unit 3 comprises Samsung S5PV210 processor, emerging MF210 module during described communication module 2 comprises.
Described echo filtering circuit 5 comprises echo process chip.Echo process chip according to any two analog signals of input, can find the echo of a wherein road analog signal, exports final analog signal after another analog signal is deducted this echo through internal algorithm.Therefore, after choosing this echo process chip, only need the selected analog signal input pin that will be connected to correspondence as a road analog signal of echogenicity, by analog signal input pin corresponding for the access of the analog signal of echo to be canceled for another road.
In preferred embodiment, the model of echo process chip is FM1188, No. 43 pins of FM1188 are connected to the L channel of loud speaker or R channel to gather downlink voice, No. 39 pins and No. 40 pins of FM1188 are connected to two outputs of microphone to gather ascending voice, No. 47 pins of FM1188 are connected to WM9713 sound card to export the analog signal after echo cancellor, and this analog signal is the real voice signal of passenger.
Because echo cancellation utilized special echo process chip to process before analog-to-digital conversion, so the resource of central processing unit can not be taken, and need not sound channel be taken when microphone image data, export tonequality and improve.
Because conventional ASM technology needs positional distance between special consideration two simulation signal generators, thus very large obstacle is produced to the successful design of product, and FM1188 receives only the sound of speaker, not by the impact of distance factor between two simulation signal generators, therefore, adaptive capacity to environment is stronger.
In addition, FM1188 is except possessing above-mentioned echo cancellation function, the noise in environment and interference can also be suppressed simultaneously, can support that O+O and O+U points to, No leakage, there is beam angle flexibly, provide good noise suppressed and better voice quality, and non-stationary noise suppression and superior full duplex ability.
The invention also discloses a kind of elevator Internet of things system, comprise the described intercom system with echo cancellation function.
In sum, the utility model sets up echo filtering circuit, it directly can gather the analog signal of the downlink voice that loud speaker exports, and the echo of the downlink voice mixed in ascending voice according to this analog signal filtering, and then can determine and export the analog signal corresponding to real passenger's voice, this analog signal can be sent to central processing unit and directly carry out analog-to-digital conversion, that is ascending voice had eliminated echo wherein before carrying out analog-to-digital conversion, therefore can not be too much take central processing unit resource, and the utility model need not take sound channel determination estimated echo when microphone image data, therefore tonequality Quality advance is exported.
By reference to the accompanying drawings embodiment of the present utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing under the ambit that the utility model aim and claim protect, also can make a lot of form, these all belong within protection of the present utility model.
Claims (7)
1. one kind has the intercom system of echo cancellation function, comprise background server (1) and be arranged on realizing and the intercom of described background server (1) speech talkback via elevator Internet of Things in elevator, it is characterized in that, described intercom comprises communication module (2), central processing unit (3), audio decoder (4), the loud speaker exporting downlink voice, the microphone gathering ascending voice and echo filtering circuit (5)
Described echo filtering circuit (5) is connected with the output of described microphone, the output of loud speaker, the input of audio decoder (4) respectively; The output of described audio decoder (4) is connected to the input of described loud speaker; Described audio decoder (4), central processing unit (3), communication module (2) connect successively, and described communication module (2) is connected with background server (1) communication;
Described echo filtering circuit (5) for the echo of downlink voice of mixing in ascending voice according to the downlink voice filtering gathered to determine and to export the analog signal corresponding to real passenger's voice; Described audio decoder (4) comprises AD conversion unit and D/A conversion unit, and the output of described echo filtering circuit (5) is connected to central processing unit (3) via described AD conversion unit, described central processing unit (3) is connected to the input of loud speaker via described D/A conversion unit; Described central processing unit (3) performs the compression and decompression of data; Described background server (1) carries out processing and receive the voice after central processing unit (3) process for being sent downlink voice to described central processing unit (3) by described communication module (2).
2. the intercom system with echo cancellation function according to claim 1, is characterized in that, described echo filtering circuit (5) comprises echo process chip.
3. the intercom system with echo cancellation function according to claim 2, is characterized in that, the model of described echo process chip is FM1188.
4. the intercom system with echo cancellation function according to claim 1, is characterized in that, described audio decoder (4) comprises WM9713 sound card.
5. the intercom system with echo cancellation function according to claim 1, is characterized in that, described central processing unit (3) comprises Samsung S5PV210 processor.
6. the intercom system with echo cancellation function according to claim 1, is characterized in that, emerging MF210 module during described communication module (2) comprises.
7. an elevator Internet of things system, is characterized in that, comprises the intercom system with echo cancellation function as described in any one of claim 1-6.
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| CN201420796652.6U CN204244283U (en) | 2014-12-15 | 2014-12-15 | There is intercom system and the elevator Internet of things system of echo cancellation function |
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| CN201420796652.6U CN204244283U (en) | 2014-12-15 | 2014-12-15 | There is intercom system and the elevator Internet of things system of echo cancellation function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106375881A (en) * | 2016-10-09 | 2017-02-01 | 深圳来邦科技有限公司 | Full-duplex window intercom system |
| CN106506025A (en) * | 2016-12-29 | 2017-03-15 | 帝信科技股份有限公司 | SIP intercoms |
| CN106507047A (en) * | 2016-11-15 | 2017-03-15 | 浙江工业大学 | A kind of audio-video terminal system towards smart home |
-
2014
- 2014-12-15 CN CN201420796652.6U patent/CN204244283U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106375881A (en) * | 2016-10-09 | 2017-02-01 | 深圳来邦科技有限公司 | Full-duplex window intercom system |
| CN106375881B (en) * | 2016-10-09 | 2024-02-20 | 来邦科技股份公司 | Full duplex window intercom system |
| CN106507047A (en) * | 2016-11-15 | 2017-03-15 | 浙江工业大学 | A kind of audio-video terminal system towards smart home |
| CN106507047B (en) * | 2016-11-15 | 2019-05-31 | 浙江工业大学 | A kind of audio-video terminal system towards smart home |
| CN106506025A (en) * | 2016-12-29 | 2017-03-15 | 帝信科技股份有限公司 | SIP intercoms |
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Granted publication date: 20150401 Termination date: 20201215 |
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