CN102098484A - Fixed-network videophone system - Google Patents
Fixed-network videophone system Download PDFInfo
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- CN102098484A CN102098484A CN2011100467138A CN201110046713A CN102098484A CN 102098484 A CN102098484 A CN 102098484A CN 2011100467138 A CN2011100467138 A CN 2011100467138A CN 201110046713 A CN201110046713 A CN 201110046713A CN 102098484 A CN102098484 A CN 102098484A
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Abstract
The invention discloses a fixed-network videophone system which realizes video conversion by utilizing a PSTN (Public Switched Telephone Network). Every two videophones in the PSTN network can carry out point-to-point video conversion. The terminal of each videophone is provided with a phone unit, an image acquisition unit, an image display unit, a switching unit, a data modulation/demodulation unit and a main control unit, wherein an external request received by the main control unit controls the switching unit to cut off the phone unit and the PSTN according to the received external request; the data modulation/demodulation unit is controlled to modulate and transmit the image information and audio information of a caller; and the data modulation/demodulation unit is controlled to modulate and output the image information and audio information of the called person. The fixed-network videophone system disclosed by the invention does not occupy other resources, and no other fees are cost except correspondence fee cost for communication between both parties. The system is convenient to install, is simple to operate and can satisfy the requirements of various crowds.
Description
Technical field
The present invention relates to a kind of telephone system, relate in particular to a kind of fixed network video-phone system.
Background technology
Development of science and technology, the people that order is in the strange land can communicate by mobile phone or landline telephone, though be far apart ten thousand li and unconsciously remote.
Present communication mode just is based on the voice communication that PSTN (PSTN) carries out except that the mobile communication of using mobile phone.Though mobile communication developed into for the 4th generation, utilize mobile phone can realize looking visual dialog, the high expense of supervening makes us forbidding unavoidably.This type of glamour of using mobile phone to carry out video call based on the communication fee order that flow rate calculation produces is had a greatly reduced quality.
And traditional voice communication of carrying out based on PSTN, its advantage is cheap, the signal stabilization of expense, shortcoming then is to satisfy the quality requirements that people day by day increase, and for example, can't realize utilizing existing network to carry out video call.
Summary of the invention
The present invention is directed to the drawback of prior art, a kind of fixed network video-phone system is provided.
Fixed network video-phone system of the present invention utilizes the PSTN network to realize video call, comprises a plurality of radio phone terminals that are connected in the PSTN network, and described radio phone terminal also comprises with lower unit except that telephone unit:
Image acquisition units, this image acquisition units are used for the image information according to the instruction acquisition caller of main control unit, and this image information is sent to main control unit;
Image-display units, this image-display units are used for showing according to the instruction of main control unit the other side caller's image information;
Switch unit, this switch unit are used for according to the instruction of main control unit telephone unit and PSTN network being disconnected, and the log-on data transmission connects;
The data modulation/demodulation unit, this data modulation/demodulation unit is used for instruction modulating/demodulating image information and the audio-frequency information according to main control unit;
Main control unit, be used for telephone unit and PSTN network being disconnected according to the external request control switch unit that receives, and the control data modulation/demodulation unit modulates caller's image information and audio-frequency information and transmits, and the control data modulation/demodulation unit is carried out demodulation and output with the other side caller's image information and audio-frequency information.
In the fixed network video-phone system of the present invention, also comprise external memory unit; This external memory unit is connected with main control unit, realizes the image information of main control unit processing and the storage of audio-frequency information; And main control unit reads the image information that stores in this external memory unit and the audio-frequency information line output of going forward side by side.
In the fixed network video-phone system of the present invention, described image acquisition units is a digital camera.
In the fixed network video-phone system of the present invention, described image-display units is a liquid crystal display screen.
Video-phone system based on fixed network of the present invention does not take other resource, the telephone charges of conversing except that between both sides, is not having other expense generation; This system is easy for installation, simple to operate, can satisfy various crowds' demand.
Description of drawings
Fig. 1 is the structural representation of fixed network video-phone system of the present invention;
Fig. 2 is the structural representation of the telephone unit in the fixed network video-phone system of the present invention;
Fig. 3 is the structural representation of the data modulation/demodulation unit in the fixed network video-phone system of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing, can implement according to this with reference to the specification literal to make those skilled in the art.
As shown in Figure 1, fixed network video-phone system of the present invention, be to utilize the PSTN network to realize video call, in the PSTN network, allow a plurality of radio phone terminals, radio phone terminal also comprises image acquisition units, image-display units, switch unit, data modulation/demodulation unit, main control unit except that telephone unit.
Wherein, described main control unit has data processing function, and it comprises center processor, memory, clock circuit, reset circuit and peripheral circuit.This main control unit is used for according to the external request control switch unit that receives telephone unit and PSTN network being disconnected, and the control data modulation/demodulation unit modulates caller's image information and audio-frequency information and transmits, and the control data modulation/demodulation unit is carried out demodulation and output with the other side caller's image information and audio-frequency information.
Described image acquisition units is used for the image information according to the instruction acquisition caller of main control unit, and this image information is sent to main control unit.This image acquisition units can adopt digital camera, and described digital camera is under the control command of main control unit, and also this image information is sent to main control unit does subsequent treatment to picked-up caller's image information.Described digital camera can be provided with by main control unit, and the operating voltage that it is required also can obtain by external power source special conversion chip.
Described image-display units is used for showing according to the instruction of main control unit the other side caller's image information.This image-display units can adopt image output elements commonly used such as liquid crystal display screen.Described liquid crystal display screen can be configured by main control unit, and its required working power also adopts external power conversion chip to obtain.
Described switch unit is used for according to the instruction of main control unit telephone unit and PSTN network being disconnected, and the log-on data transmission connects.In the fixed network video-phone system of the present invention, when not realizing video call, telephone unit is connected with PSTN, and after setting up video call, this telephone unit and PSTN disconnect.The realization of above-mentioned change action is by means of described switch unit, and this switch unit is controlled switching into end line by relay, makes that when not setting up video call, telephone unit is connected with PSTN by relay, to realize voice call; And after setting up video call, then disconnect being connected of telephone unit and PSTN, and to prevent its interference, simultaneously, start the analog/digital conversion of voice to the data modulation/demodulation unit, the speech data of analog form is converted to the speech data of digital form.
Described data modulation/demodulation unit is used for instruction modulating/demodulating image information and the audio-frequency information according to main control unit.In the fixed network video-phone system of the present invention, both call sides is by means of PSTN Network Transmission image information and audio information data bag, image information and audio-frequency information reduced holding separately, to realize utilizing fixed network to carry out the effect of video call again.Be sent to the other side caller through the PSTN network after the one's own side caller's that described image acquisition units collects image information is modulated, presented at image-display units after the data modulation/demodulation unit demodulation by the other side caller place; Be sent to the other side caller through the PSTN network after the speech data of described digital form is then modulated, presented at telephone unit after the data modulation/demodulation unit demodulation by the other side caller place.The other side caller's image information and speech data be same to carry out demodulation after being sent to the data modulation/demodulation unit at one's own side caller place after modulated, is then presented by image-display units and telephone unit.
Further, for expanding the data space of fixed network video-phone system of the present invention, to satisfy in the communication process storage demand of big capacity image information and audio-frequency information, the present invention also can increase external memory unit is set, this external memory unit is connected with main control unit, the image information that realization is handled main control unit and the storage of audio-frequency information, in addition, main control unit also can read the image information that stores in this external memory unit and the audio-frequency information line output of going forward side by side.Described external memory unit can specifically adopt storage mediums commonly used such as Micro SD card.
As shown in Figure 3, among the present invention, described data modulation/demodulation unit can be by SI2438 processor, interface network, SI3018 processor, come bell and caller identification to receive network, signal receiving circuit, signal sending circuit, AC/DC adjusts circuit, HOOK-ON/OFF circuit and polarity transformation circuits etc. and forms.
Wherein, described SI2438 processor be inside integrated the chip of DSP, ROM, RAM, PLL, UART interface, DAA interface, carry out information exchange by the AT order with external equipment, agreements such as V3.4, V4.2 are supported in communication between the data modulation/demodulation unit; For preventing to disturb, partly taked isolation processing with DAA.
Described interface network is a network of being made up of electric capacity and resistance, is used for being connected between SI2438 and SI3018, and it has three effects: promptly SI2438 transmits data to SI3018; SI2438 receives data from SI3018; During data modulation/demodulation unit on-hook, be used for powering to SI3018;
The described SI3018 interface of portion pair and SI2438 has within it carried out isolation processing, and it can directly receive cid data from " coming bell, CID network ", detect bell and dislodging machine information; Its may command data modulation/demodulation unit is plucked, on-hook, behind the off-hook, can control the line data of going forward side by side transmission by being provided with to parameters such as line impedance and D.C. resistances.
Described to come bell and CID to receive network be a network of being made up of electric capacity and resistance, is used for the plucking of detection system, on-hook, incoming call ringing-current and reception cid data.
Described signal receiving circuit is behind data modulation/demodulation unit off-hook, is used to receive the signal that transmits on the line.
Described signal sending circuit is behind data modulation/demodulation unit off-hook, is used for sending on line signal.
It is behind off-hook that described AC/DC adjusts circuit, mainly carries out following work in circuit: the direct current (as resistance) that guarantees data modulation/demodulation element circuit end meets the requirements with parameters such as exchanging (as impedance); The realization circuit is kept its work to SI3018 feedback stream; The adjustment of exporting controlled quentity controlled variable according to the difference of feedback stream on the line.
Described HOOK-ON/OFF circuit is controlled by SI3018, behind the data modulation/demodulation unit off-hook, can keep the triode conducting by line powering and make system be in off hook state, and line powering is cut off after the on-hook, and triode is got back to cut-off state again.
Described polarity transformation circuits is that the uncertainty of input line signal polarity is carried out conversion, becomes the line signal polarity of regulation.For improving the reliability of data modulation/demodulation unit, front-end circuit adding magnetic bead, resistance, electric capacity in the data modulation/demodulation unit carry out High frequency filter, have both prevented that from the interference on the circuit interference and coupling that stops system again is to circuit in addition.
In addition, the required power supply in data modulation/demodulation unit can be through the 5V power supply after the DC/DC conversion, because system complex, the power type that needs is many, for using the bigger 3.3V power supply of more consumption stream, take a 5V to handle afterwards and realize, the linear power supply simple in structure that uses that those consumption streams are little is handled through DC/DC.
As shown in Figure 2, described telephone unit comprises modules such as keyboard, DTMF signaling, transmitting-receiving speech channel, single-chip microcomputer, signal switching circuit, power amplifier, peripheral circuit, handle.
Wherein, described single-chip microcomputer is used for implementing the most basic telephone functionality is carried out in telephone unit control, also bears keyboard scan simultaneously and carries out serial communication with main control unit.
Whether described keyboard is controlled by single-chip microcomputer, adopts 3 * 6 keyboard matrixs, have key to press by interrupting differentiating, and single-chip microcomputer is given main control unit key assignments by serial ports.
In the described DTMF signaling circuit, single-chip microcomputer produces required touch-tone signal by two wires (clock and data) control dtmf code device, delivers on the PSTN network through " sending and receiving speech channel ".
In the described transmitting-receiving speech channel, the simulated audio signal on the circuit that receives is carried out processing and amplifying, make it can drive the transmitter of receiving handle; The voice signal that desire is sent carries out processing and amplifying and delivers on the circuit; Eliminate the recovery of telecommunication signal by the sidetone network; Realize the impedance matching of circuit.
Described audio signal commutation circuit is controlled by single-chip microcomputer, is connected with handle receiver, hand-free loudspeaker with the digital signal of changing from the audio frequency modulus conversion chip by the signal of analog switch control from " transmitting-receiving speech channel ".
Described power amplifier is in order to improve the output amplitude of audio signal, now to have increased the one-level audio power amplifying circuit, selecting for use LM386 to use as amplifier here.
Described peripheral circuit then is made up of ringing circuit, serial to parallel conversion chip, off-hook detection, speech channel connection control etc.
In the fixed network video-phone system of the present invention, can on existing P STN network, realize voice, the point-to-point transmission of image, its working mechanism is: be earlier logical another radio phone terminal with a radio phone terminal earlier, between radio phone terminal, set up link, send " setting up visual " application by a direction the opposing party then, both sides are by the simulation talking state, switch in the data modulation/demodulation communication, carrying out communication consults, after consulting successfully, one side is handling and send to the opposing party from the voice messaging of audio frequency modulus conversion chip collection and the image information of camera collection, the opposing party handles the data of receiving, view data delivered on the liquid crystal show, speech data is delivered to the audio frequency analog-digital chip be reduced into former " simulation " audio signal; The opposing party is simultaneously handling and send to an aforesaid side from the voice messaging of one's own side's audio frequency modulus conversion chip collection and the image information of camera collection, this described side then handles the data of receiving, view data delivered on the liquid crystal show, speech data is delivered to the audio frequency analog-digital chip be reduced into former " simulation " audio signal.
Should not take other resource based on the video-phone system of fixed network, the telephone charges of except that between both sides, conversing, do not having other expense generation; This system is easy for installation, simple to operate, can satisfy various crowds' demand.
Be the course of work that example illustrates fixed network video telephone of the present invention to dial radio phone terminal below:
After single-chip microcomputer detects off hook signal, start speech path control, send off-hook information by serial ports to main control unit simultaneously, main control unit switches to the off-hook display interface with the LCDs interface; When the user presses numerical key, single-chip microcomputer reads this key assignments and gives main control unit and distinguish processing, if dialed digit, then main control unit is issued single-chip microcomputer to the value of this key correspondence, single-chip microcomputer starts the DTMF code sender, transfer to this sign indicating number by speech channel, by that analogy, after putting through the other side (the other side's off-hook), both sides finish speech channel and set up, visual foundation can be initiated (not allowing to initiate simultaneously visual) by the either party, if visual by Party A's initiation, then Party A's main control unit sends instruction and cuts off telephone unit earlier, log-on data modulation/demodulation unit and DAA work simultaneously, and send CI to the Party B, Party B's data modulation/demodulation unit receive and this information of demodulation after, the telephone unit that cuts off the Party B, start the DAA circuit of Party B's data modulation/demodulation unit simultaneously, next both sides enter data modulation/demodulation unit communications state, and both sides hold consultation under the agreement of regulation, find out optimum bandwidth; Both sides carry out encoding compression processing to image and the voice messaging gathered separately, issue the other side after the packing, the other side reduces processing to the data of receiving, gives liquid crystal display screen image information and shows, gives handle voice messaging by analog-digital chip and is exported.
Although embodiment of the present invention are open as above, but it is not restricted to listed utilization in specification and the execution mode, it can be applied to various suitable the field of the invention fully, for those skilled in the art, can easily realize other modification, therefore under the universal that does not deviate from claim and equivalency range and limited, the legend that the present invention is not limited to specific details and illustrates here and describe.
Claims (4)
1. a fixed network video-phone system utilizes the PSTN network to realize video call, and radio phone terminal only need insert the PSTN network and get final product, and radio phone terminal also comprises with lower unit except that telephone unit:
Image acquisition units, this image acquisition units are used for the image information according to the instruction acquisition caller of main control unit, and this image information is sent to main control unit;
Image-display units, this image-display units are used for showing according to the instruction of main control unit the other side caller's image information;
Switch unit, this switch unit are used for according to the instruction of main control unit telephone unit and PSTN network being disconnected, and the log-on data transmission connects;
The data modulation/demodulation unit, this data modulation/demodulation unit is used for instruction modulating/demodulating image information and the audio-frequency information according to main control unit;
Main control unit, be used for telephone unit and PSTN network being disconnected according to the external request control switch unit that receives, and the control data modulation/demodulation unit modulates caller's image information and audio-frequency information and transmits, and the control data modulation/demodulation unit is carried out demodulation and output with the other side caller's image information and audio-frequency information.
2. fixed network video-phone system as claimed in claim 1 is characterized in that, also comprises external memory unit;
This external memory unit is connected with main control unit, realizes the image information of main control unit processing and the storage of audio-frequency information; And main control unit reads the image information that stores in this external memory unit and the audio-frequency information line output of going forward side by side.
3. fixed network video-phone system as claimed in claim 1 is characterized in that, described image acquisition units is a digital camera.
4. fixed network video-phone system as claimed in claim 1 is characterized in that, described image-display units is a liquid crystal display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100467138A CN102098484A (en) | 2011-02-25 | 2011-02-25 | Fixed-network videophone system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100467138A CN102098484A (en) | 2011-02-25 | 2011-02-25 | Fixed-network videophone system |
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| CN102098484A true CN102098484A (en) | 2011-06-15 |
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| CN2011100467138A Pending CN102098484A (en) | 2011-02-25 | 2011-02-25 | Fixed-network videophone system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106791018A (en) * | 2016-11-30 | 2017-05-31 | 中国电子科技集团公司第三十研究所 | The voice signal switching system and method for phone between difference net system |
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| CN2500054Y (en) * | 2001-10-24 | 2002-07-10 | 西安交大开元科技投资有限公司 | Visual telephone |
| CN1527601A (en) * | 2003-03-06 | 2004-09-08 | 中兴通讯股份有限公司 | Video telephone realizing method and equipment |
| CN101212639A (en) * | 2006-12-29 | 2008-07-02 | 爱普拉斯通信技术（北京）有限公司 | Visual telephone terminal |
| CN101465911A (en) * | 2009-01-07 | 2009-06-24 | 瞿铃鑑 | 3G visual fixed telephone |
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2011
- 2011-02-25 CN CN2011100467138A patent/CN102098484A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2500054Y (en) * | 2001-10-24 | 2002-07-10 | 西安交大开元科技投资有限公司 | Visual telephone |
| CN1527601A (en) * | 2003-03-06 | 2004-09-08 | 中兴通讯股份有限公司 | Video telephone realizing method and equipment |
| CN101212639A (en) * | 2006-12-29 | 2008-07-02 | 爱普拉斯通信技术（北京）有限公司 | Visual telephone terminal |
| CN101465911A (en) * | 2009-01-07 | 2009-06-24 | 瞿铃鑑 | 3G visual fixed telephone |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106791018A (en) * | 2016-11-30 | 2017-05-31 | 中国电子科技集团公司第三十研究所 | The voice signal switching system and method for phone between difference net system |
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Application publication date: 20110615 |