CN203225839U - Video communication device applied to PSTN - Google Patents
Video communication device applied to PSTN Download PDFInfo
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- CN203225839U CN203225839U CN 201320269584 CN201320269584U CN203225839U CN 203225839 U CN203225839 U CN 203225839U CN 201320269584 CN201320269584 CN 201320269584 CN 201320269584 U CN201320269584 U CN 201320269584U CN 203225839 U CN203225839 U CN 203225839U
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Abstract
The utility model relates to the field of communication technology and especially relates to a video communication device applied to a PSTN (Public Switched Telephone Network). The video communication device applied to the PSTN includes an embedded microprocessor, a power assembly, an SLIC chip, a speech recognition assembly, an audio amplifying assembly, a storage and memory, a video data collecting assembly and a video playing assembly. The video communication device applied to the PSTN provided by the utility model has effects of establishing 64Kbps MODEM digital channel on a low-frequency analog channel with established analog dialogue and transmitting audio-video data and control signals by utilizing an H324 protocol. What is different from prior patents and prior products is that the audio-video data are transmitted in the low-frequency analog channel of the PSTN, so that no IP packet switching channel is required to establish. Since no IP network protocol stack is needed, realization costs of hardware and software are lowered. And since no IP network connection is needed, using cost is lowered.
Description
Technical field
The utility model relates to communication technical field, relates in particular to a kind of video calling device that is applied in the PSTN.
Background technology
Along with the communication technology and development of internet technology, people no longer are satisfied with traditional communication on telephone, and video calling is in network communication field, because its bigger bandwidth has obtained using widely.But the video calling of employing network service is had relatively high expectations to Intelligent Terminal, such as needs PC device and corresponding software, perhaps can insert the intelligent terminal of internet, and packet switching network need be arranged as transmission channel.This is concerning the common user that telephone service only has been installed, and the realization video calling need be installed the network equipment, needs to be equipped with intelligent terminal, and cost is too high, is difficult to popularize.There have been some patents to relate at present and utilized PSTN to realize video calling, integrated system as patent No. 200410039512.5(ip voice video and pstn telephone) and the multifunctional videophone machine of patent No. 200720050569.4(PSTN speech+IP video) two patents, but these two kinds of implementations have the method that has adopted the IP packet switching to come transmitting video data, comparatively inconvenience.
The function of video calling is not extensive use of as yet at present, reason is that the service fee height of video calling or the terminal with video communication are expensive, do not accepted by masses, in case comparatively convenient and cheap scheme implementation are arranged, the business of video calling will be widely used.
The utility model content
The purpose of this utility model is to provide a kind of video calling device that is applied in the PSTN, has solved to realize that at present visual telephone business needs the comparatively expensive equipment of cost, and has installed and allocate all very inconvenient problem.
For addressing the above problem, technical solution adopted in the utility model is:
A kind of video calling device that is applied in the PSTN comprises with lower member:
-embedded microprocessor: be connected with embedded microprocessor with the PCM data/address bus by the SPI serial bus, by spi bus transmission phone channel associated signalling, by pcm bus transferring voice sampled data;
-power supply module: it is adaptive to finish high-low pressure, and equipment is powered;
-have a SLIC chip of FXO interface function:
-speech recognition component: connect microphone, be used for the audio analog signals collection;
-audio frequency amplifier module: connect loud speaker, hand-free function is provided;
-memory and internal memory: be connected in described embedded microprocessor by control bus and data/address bus respectively;
-video data acquiring assembly: connect camera, be used for video data acquiring, connect described embedded microprocessor by device bus;
-video playback assembly: mainly by lcd controller and LCD screen, wherein the LCD screen is used for the video data broadcast, also is used for showing configuration and dialing information, incoming information etc. simultaneously, and lcd controller connects described embedded microprocessor by device bus.
Further technical scheme is, this device also comprises LED light and indicator light control circuit, and described LED light is connected with the universal input and output port of embedded microprocessor by described indicator light control circuit in proper order.
Further technical scheme is, this device also comprises keyboard, and described keyboard is connected with the universal input and output port of described embedded microprocessor.
Further technical scheme is, described power supply module also is connected with civil power.
Further technical scheme is, described SLIC chip comprises ringing identification circuit, off-hook on-hook circuit, A/D change-over circuit and D/A conversion.
The beneficial effect that adopts technique scheme to produce is:
The utility model can utilize the H324 agreement, set up the MODEM digital channel of 64Kbps in the low frequency analog channel of setting up the simulation conversation, transmission tone video data and control signaling, different with product with existing patent is, the data of audio frequency and video all are to transmit on the low frequency analog channel of PSTN, do not require and set up the IP packet switched channels.Owing to do not need the IP network protocol stack, hardware and software realizes that cost is lower, does not need IP network to connect, and use cost is lower.
Description of drawings
Fig. 1 is a kind of structural representation that is applied to the video calling device in the PSTN of the utility model.
Fig. 2 is a kind of software design system block diagram that is applied to the video calling device in the PSTN of the utility model.
Fig. 3 sets up flow chart for a kind of video calling that is applied to the video calling device in the PSTN of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 1 shows an a kind of embodiment who is applied to the video calling device in the PSTN of the utility model: a kind of video calling device that is applied in the PSTN comprises with lower member:
-embedded microprocessor: be connected with embedded microprocessor with the PCM data/address bus by the SPI serial bus, by spi bus transmission phone channel associated signalling, by pcm bus transferring voice sampled data;
-power supply module: it is adaptive to finish high-low pressure, and equipment is powered;
-have a SLIC chip of FXO interface function:
-speech recognition component: connect microphone, be used for the audio analog signals collection;
-audio frequency amplifier module: connect loud speaker, hand-free function is provided;
-memory and internal memory: be connected in described embedded microprocessor by control bus and data/address bus respectively, adopt DDR sdram memory and Flash memory among Fig. 1;
-video data acquiring assembly: connect camera, be used for video data acquiring, connect described embedded microprocessor by device bus;
-video playback assembly: mainly by lcd controller and LCD screen, wherein the LCD screen is used for the video data broadcast, also is used for showing configuration and dialing information, incoming information etc. simultaneously, and lcd controller connects described embedded microprocessor by device bus.
Fig. 1 also shows a kind of another embodiment that is applied to the video calling device in the PSTN of the utility model, this device also comprises LED light and indicator light control circuit, and described LED light is connected with the universal input and output port of embedded microprocessor by described indicator light control circuit in proper order.
According to an a kind of preferred embodiment that is applied to the video calling device in the PSTN of the utility model, this device also comprises keyboard, and described keyboard is connected with the universal input and output port of described embedded microprocessor.
According to a kind of another preferred embodiment that is applied to the video calling device in the PSTN of the utility model, described power supply module also is connected with civil power.
Fig. 1 also shows a kind of another embodiment that is applied to the video calling device in the PSTN of the utility model, and described SLIC chip comprises ringing identification circuit, off-hook on-hook circuit, A/D change-over circuit and D/A conversion.
In actual applications, the utility model is a kind of, and to be applied to occupation mode and the plain old telephone of the video calling device in the PSTN similar, is to adopt telephone wire to connect the FXS mouth of front and the FXO mouth on the terminal, and its operation principle is described below:
(1) when the phone incoming call, when the phone incoming call, the local side telephone exchange produces bell signal by the FXS mouth, after ringing identification circuit recognizes signal, the notice embedded microprocessor is notified the user by ring, the demonstration of LED lamp and LCD caller identification mode;
(2) after the user answers, whether A/D change-over circuit and D/A change-over circuit can detect far-end and attempt setting up the MODEM digital channel, if do not have, then are common analog telephones; If, then carry out the MODEM handshake procedure, set up the MODEM digital channel;
(3) to the situation of breathing out, off-hook, dial mode are identical with common phone, if carry out video calling, can set up the MODEM digital channel with far-end;
(4) in a single day set up the MODEM digital channel, then can begin to carry out the Signalling exchange of H245, comprise capabilities exchange, master-slave negotiation, multi-meter exchange, open logical channel;
(5) after the audio frequency and video logical channel has been set up, gather the Voice ﹠ Video data, become the PDU bag by the H223 protocol multiplexing, and send, the H223PDU bag to receiving carries out demultiplexing, plays back by microphone (or loud speaker) and LCD screen respectively;
When (6) video calling finishes, no matter be local on-hook or far-end on-hook, all be to close logical channel, H245 control channel, MODEM digital channel earlier, close loop at last.
As shown in Figure 2, a kind of software that is applied to the video calling device in the PSTN of the utility model is realized adopting the embedded Linux platform, mainly comprises 10 parts:
(1) main thread, the hinge as user's input, system message and data are handled connects each functional module of the following stated.
(2) the H324 protocol stack is realized the storehouse, comprises call control protocol H.245 and H.223 transmits the realization of multiplex/demultiplex agreement.
G.723.1 or AMR (3) audio code decode algorithm is as
H.263 or H.264 (4) coding and decoding video algorithm is as
(5) SLIC drives adaptation module, relates to analog call and sets up, and the MODEM passage is set up, functions such as incoming call ring detection.
(6) microphone audio data acquisition module
(7) camera video data acquisition module
(8) loudspeaker audio playing module
(9) LCD operation interface based on the embedded Linux development platform, can adopt the interface development storehouse of similar Qt or similar Android platform java storehouse to realize.
(10) image display shows the video data of this locality collection and the video data of far-end in the LCD specific region.
A kind of video calling that is applied to the video calling device in the PSTN of the utility model is set up main flow process and is comprised as shown in Figure 3:
(1) sets up process by similar common PSTN conversation, set up the simulation conversation;
(2) calling party initiates the MODEM digital channel and sets up process, sets up the MODEM digital channel of 64kpbs between two terminals;
(3) pass through H.245 call control signalling, carry out capabilities exchange, master-slave negotiation, processes such as multi-meter exchange and logical channel foundation negotiate sound, coding and decoding video and transmission means that both sides support;
(4) adopt H.223 the multiplex/demultiplex protocol transmission through the audio, video data of over-sampling and coding, simultaneously the audio, video data that receives is decrypted, synchronously and play;
(5) when finishing conversation, earlier by H.245 closing logical channel, disconnect MODEM and analog channel again.
Claims (5)
1. a video calling device that is applied in the PSTN is characterized in that: comprise with lower member
-embedded microprocessor: be connected with embedded microprocessor with the PCM data/address bus by the SPI serial bus, by spi bus transmission phone channel associated signalling, by pcm bus transferring voice sampled data;
-power supply module: it is adaptive to finish high-low pressure, and equipment is powered;
-have a SLIC chip of FXO interface function:
-speech recognition component: connect microphone, be used for the audio analog signals collection;
-audio frequency amplifier module: connect loud speaker, hand-free function is provided;
-memory and internal memory: be connected in described embedding by control bus and data/address bus respectively and decline
The placeThe reason device;
-video data acquiring assembly: connect camera, be used for video data acquiring, connect described embedded microprocessor by device bus;
-video playback assembly: mainly by lcd controller and LCD screen, wherein the LCD screen is used for the video data broadcast, also is used for showing configuration and dialing information, incoming information etc. simultaneously, and lcd controller connects described embedded microprocessor by device bus.
2. a kind of video calling device that is applied in the PSTN according to claim 1, it is characterized in that: this device also comprises LED light and indicator light control circuit, and described LED light is connected with the universal input and output port of embedded microprocessor by described indicator light control circuit in proper order.
3. a kind of video calling device that is applied in the PSTN according to claim 1, it is characterized in that: this device also comprises keyboard, described keyboard is connected with the universal input and output port of described embedded microprocessor.
4. a kind of video calling device that is applied in the PSTN according to claim 1, it is characterized in that: described power supply module also is connected with civil power.
5. according to any described a kind of video calling device that is applied in the PSTN of claim 1-4, it is characterized in that: described SLIC chip comprises ringing identification circuit, off-hook on-hook circuit, A/D change-over circuit and D/A conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320269584 CN203225839U (en) | 2013-05-16 | 2013-05-16 | Video communication device applied to PSTN |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320269584 CN203225839U (en) | 2013-05-16 | 2013-05-16 | Video communication device applied to PSTN |
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| Publication Number | Publication Date |
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| CN203225839U true CN203225839U (en) | 2013-10-02 |
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| CN 201320269584 Expired - Lifetime CN203225839U (en) | 2013-05-16 | 2013-05-16 | Video communication device applied to PSTN |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016000175A1 (en) * | 2014-06-30 | 2016-01-07 | 华为技术有限公司 | Data packet processing method, device and modem |
-
2013
- 2013-05-16 CN CN 201320269584 patent/CN203225839U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016000175A1 (en) * | 2014-06-30 | 2016-01-07 | 华为技术有限公司 | Data packet processing method, device and modem |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131002 |