CN1222030A - Camcorder having real-time tranmission and reception function of moving picture signals - Google Patents
Camcorder having real-time tranmission and reception function of moving picture signals Download PDFInfo
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- CN1222030A CN1222030A CN 98122841 CN98122841A CN1222030A CN 1222030 A CN1222030 A CN 1222030A CN 98122841 CN98122841 CN 98122841 CN 98122841 A CN98122841 A CN 98122841A CN 1222030 A CN1222030 A CN 1222030A
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Abstract
A camcorder transmites having real-time tranmission and reception function of moving picture signals from the external video device respectively via telephone line, including: a shooting device for shooting objects and converting shooting signals to moving picture signals; a real-time video code-decoder for compressing codes and decoding moving picture signals; a modulator; a signal processing device; key-entry part for providing tranmission and reception function of key signals of moving picture signals, telephone numbers and a controller for controlling the modulator, the real-time video code-decoder and the signal processing device. The camcorder has advantages of simple structure, low cost and easy operation.
Description
The present invention relates to a kind of video camera, relate in particular to a kind of video camera that can utilize telephone wire to send and receive the motion video signal in real time, wherein in common video camera structure, added real-time video codec, modulator-demodulator and had the controller of controlling real-time video codec and modem feature in addition.
In general, video camera be a kind of image that utilizes video camera to obtain object, at the moving picture signals of show taking on the screen, output on the external equipment or be recorded on the recording medium and reproduce the video equipment that is recorded in the signal on the medium.
Traditional video camera can not utilize the telephone wire of extensive distribution to send and receive the moving picture signals of shooting in real time.The industrial siding of utilization resemble the Local Area Network sends the moving picture signals taken by traditional video camera in real time to video equipment in short distance, and utilize relaying mobile service station and satellite communication network in real time at the moving picture signals of the above-mentioned shooting of the long interior transmission of distance to video equipment.Like this, traditional video camera has cost height and inconvenient problem with use when sending the motion picture taken to video equipment remote in real time.
Simultaneously, under the situation of the video conferencing system of current development, need control and signal processing system to carry out sending the multi-medium data that a large amount of comprising has high-quality moving picture data through the industrial siding of conference member terminal room two-wayly.Therefore, become complexity and cost height of video conferencing system.The video-telephone system of current development should send current a large amount of multi-medium data with high-quality moving picture data that comprises via industrial siding or at least one Integrated Service Digital Network two-wayly.Therefore, that video-telephone system becomes is complicated, cost is high, can not carry, and inconvenience is used.
In order to address the above problem, an object of the present invention is to provide a kind of video camera, this video camera can utilize the telephone wire of extensive distribution rather than industrial siding to send moving picture signals in real time to another video equipment with from another video equipment reception moving picture signals.
For finishing above-mentioned purpose of the present invention, provide a kind of and can send moving picture signals in real time to another video equipment with receive the video camera of moving picture signals from another video equipment via telephone wire, this video camera comprises: filming apparatus, be used to take an object, and with the moving picture signals of conversion of signals for playing of taking; The real-time video codec, be used for the moving picture signals of compressed encoding from filming apparatus output, thereby can utilize telephone wire to send moving picture signals in real time and export compressed encoding after result and the moving picture signals real-time decoding that is used for receiving via telephone wire be moving picture signals before the compressed encoding and the result behind the output decoder; Modulator-demodulator is used for and will sends to the external video equipment that is connected with telephone wire in real time from the moving picture signals of the compressed encoding of real-time video codec output, and will output to the real-time video codec via the moving picture signals that telephone wire receives; Signal processor means, be used on screen showing one from the moving picture signals of filming apparatus and real-time video codec, this moving picture signals is outputed to external video equipment, write down this picture signal and neutralize from this picture signal of recording medium reproducing to recording medium; Key input part is used for the key operation according to the user, and the key signals and the telephone number that send and receive the moving picture signals of taking are provided; And controller, be used in response to the transmission that applies from key input part and receive the key signals of captured moving picture signals and telephone number and the phone connection status signal that applies from modulator-demodulator, control modulator-demodulator, real-time video codec and signal processing apparatus.
Above-mentioned purpose of the present invention and other advantage will become more obvious by structure and the operation that invention will be described in detail with reference to the attached drawing, wherein:
Fig. 1 is the block diagram according to the video camera with transmission in real time and reception function of moving picture signals of the preferred embodiments of the present invention;
Fig. 2 utilizes telephone wire in Fig. 1 video camera to send and receive the flow chart of the method for moving picture signals in real time.
The preferred embodiment that invention will be described in detail with reference to the attached drawing.
With reference to Fig. 1, the video camera with function of moving picture signals of real-time transmission and reception shooting also comprises real-time video codec 160 and modulator-demodulator 170 except the structure example that comprises general video camera as taking unit 140 and the signal processing unit 150 in by the main operation part 100 of control unit 120 controls.Key input part among Fig. 1 also comprises real-time transmission and receives the key of moving picture signals except the key that comprises prior art.Control unit 120 also has the function of the phone connection status signal controlling real-time video codec 160, modulator-demodulator 170 and the signal processing unit 150 that apply according to the key signals of real-time transmission that applies from key input part 110 and reception and telephone number and from modulator-demodulator 170.This signal processing unit 150 also comprises the input port that is used for receiving selectively from the moving picture signals of real time codec device 164 recoveries under the control of control unit 120.Simultaneously, the power subsystem shown in Fig. 1 130 with take unit 140 and have the identical 26S Proteasome Structure and Function of power subsystem and shooting unit with prior art.
In more detail, key input part 110 shown in Fig. 1 is carried key signals such as power key signal, zoom key signal, record key signals and the playback key signal etc. of the general utility functions of carrying out video cameras, and the key signals of carrying out real-time transmission of the present invention and receiving the function of the moving picture signals of taking is that phone is connected initiating key signal, telephone number and phone and is connected end key signals etc. to control unit 120.This control unit 120 is applied to relevant control signal power subsystem 130 respectively, takes unit 140 and signal processing unit 150 according to the power key signal that applies respectively from key input part 110, zoom key signal, record key signals, playback key signal etc.This control unit 120 connects initiating key signal, telephone number according to the phone that applies from key input part 110 respectively and is connected with phone and finishes key signals etc. and from the phone connection status signal that modulator-demodulator 170 applies, respectively the control signal of being correlated with is applied to modulator-demodulator 170, real-time video codec 160 and signal processing unit 150.Power subsystem 130 connects or cuts out the driving power of whole system according to from controlling the power key control signal that unit 120 applies.Here, power subsystem 130 obtains energy from portable battery or external power source.
Simultaneously, when providing energy to whole system, take unit 140, display unit 156 and outside output 158 and start to carry out the inherent function of each part automatically by power subsystem 130.Taking unit 140 will take vision signal that an object obtains and be converted to the result that the moving picture signals that can be shown and output are changed.In more detail, camera lens part 142 is according to the zoom key control signal that applies from control unit 120 such as zoom amplifies and zoom dwindles signal and carries out zoom, and the light signal of the object that will be captured utilizes photoelectric effect to be converted to the signal of telecommunication.Signal converter 144 will divide 142 moving picture signals such as the composite video signal of shooting conversion of signals for showing from camera lens part, and transformation result is offered signal processing unit 150 and real-time video codec 160 respectively.
Select a signal the moving picture signals of moving picture signals that the signal processing unit 150 shown in Fig. 1 provides from signal converter 144 and the recovery that provides from real-time decoder 164 and show at screen, this signal that output is selected is to external video equipment, records it in medium and from this signal of recording medium reproducing.In more detail, display part 156 is selected on the screen that is presented at as LCD from the moving picture signals that is provided by signal converter 144 and real-time decoder 164 under the control of control unit 120.One outside output 158 is selected one and is outputed to the external equipment that is connected via cable from signal converter 144 and the moving picture signals that provides from real-time decoder 164, as TV receiver or large screen display.Record shown in Fig. 1 and reproducing part 152 will be converted to recordable signal by the moving picture signals that signal converter 144 provides, transformation result is recorded in the recording medium 154, and will will be outputed to the moving picture signals reproduction of writing down on the recording medium 154 of display part 156 and outside output 158 thereafter respectively.Here, be under the situation of tape-shaped medium's of video camera when recording medium 154, need an additional records media drive (not shown), when recording medium 154 is permanent memory, do not need extra recording medium drive.As shown in phantom in Figure 1, record and reproducing part 152 can the moving picture signals that has recovered that be provided by real-time decoder 164 be provided in the recording medium 154, and will offer Real Time Compression encoder 162 by the moving picture signals that recording medium 154 reproduces.In addition, signal processing unit 150 can optionally comprise display part 156, outside output 158 and record and reproducing part 152.
This real-time video codec 160 is activated and bans use of under the control of control unit 120, and this real-time video codec 160 comprises Real Time Compression encoder 162 and real-time decoder 164.The moving picture signals compressed encoding that this Real Time Compression encoder 162 will be provided by signal converter 144 is to output to modulator-demodulator 170 via the moving picture data amount of telephone wire transmission in real time and with the result behind the compressed encoding.Here, be under the situation of skimulated motion picture signal at the signal that provides from signal converter 144, Real Time Compression encoder 162 is converted to the digital moving picture signal with the skimulated motion picture signal, carries out the Real Time Compression encoding operation then.The moving picture signals that is provided by modulator-demodulator 170 that 164 pairs of this real-time decoders are received carries out real-time decoding, making it to decode becomes moving picture signals before the compressed encoding, be the original motion picture signal, and with the digital moving picture conversion of signals recovered for being output to the skimulated motion picture signal of signal processing unit 150.
What here, the compression ratio of moving picture signals should be suitable is big so that utilize telephone wire rather than industrial siding to send moving picture signals.Therefore, the telephone wire that in Fig. 1 equipment, uses with have bit rate and be less than or equal under the situation that the public switch telephone network of 64Kbps (PSTN) is connected, H.263 moving picture signals is carried out compressed encoding in real time according to what real-time video codec 160 of the present invention adopted preferably that ITU-T recommends, and the G.723 compressed encoding audio signal that preferably adopts ITU-T to recommend.Here, bit rate at modulator-demodulator 170 is under the situation of 33.6Kbps, experimental result according to the inventor might make vision signal have the transfer rate of 5Kbps to 24Kbps, audio signal has the transfer rate of 5.3Kbps to 6.3Kbps, so moving picture signals can utilize the PSTN of extensive distribution to transmit effectively.The telephone wire that in Fig. 1 equipment, uses with have the situation that the Narrowband Integrated Services Digital Network (N-ISDN) of 64Kbps to the 1.92Mbps bit rate be connected under, H.261 moving picture signals is carried out compressed encoding in real time according to what real-time video codec 160 of the present invention adopted preferably that ITU-T recommends.The translatory movement picture signal is better than quality under the situation about being used among the above-mentioned PSTN in this case.And, can adopt based on current just in the vision signal of the coding of standardized MPEG-4 according to real-time video codec 160 of the present invention.
Modulator-demodulator 170 shown in Fig. 1 connects beginning control signal, telephone number, phone johning knot beam control signal according to control signal that applies from control unit 120 such as phone, telephone number that is provided or the call that disconnection connected are provided in call, and will represent that the phone connection status signal whether call connects offers control unit 120.Modulator-demodulator 170 will send to the opposing party's video equipment via telephone wire in real time by the moving picture signals that Real Time Compression encoder 162 provides, and utilize telephone wire to output to real-time decoder 164 from the moving picture signals that another video equipment receives.Simultaneously, receive under the situation of call at the video equipment from the opposing party of being in stand-by state, modulator-demodulator 170 is checked modem signals, thereby notice control unit 120 has received call, under the control of control unit 120, call is connected like this.Remaining process as mentioned above.Here, among the ISDN of the PSTN of the telephone wire that uses of the present invention and above-mentioned extensive distribution and extensive distribution is connected.
Operation with Fig. 1 equipment of said structure describes in detail with reference to Fig. 2.At first, when according to user's key operation when key input part 110 imposes on control unit 120 1 power connection key signals, power subsystem 130 offers whole system (step 200) with driving power under the control of control unit 120.If system switches on, then lens unit 142, signal converter 144, display part 156 and outside output 158 start automatically, to carry out the inherent function (step 210) of each parts.In response to the operation of user's key, only under the control of control unit 120, start and ban use of this record and reproducing part 152.
All the time this control unit 120 of the key signals that inspection is applied judges whether the key signals that is applied is that phone connects initiating key signal (step 220).If the result who judges is that the key signals that is applied is not that phone connects the initiating key signal, then control unit 120 control video cameras are taken an object the outcome record of taking is reproduced the record result to recording medium 154 and from recording medium 154, be displayed on the screen after probable, that is, carry out typical video camera function (step 300).
Simultaneously, if key operation according to the user, what apply from key input part 110 is that phone connects the initiating key signal, and then import telephone number then, or what apply from modulator-demodulator 170 is expression from the signal of the call of other side's video equipment reception of being connected with telephone wire, then control unit 120 is controlled modulator-demodulators 170, thereby call is connected (step 230) with telephone number corresponding.If on call has connected under the control of control unit 120, then this modulator-demodulator 170 provides a phone connection status signal to control unit 120.So control unit 120 starts this real-time video codec 160 (step 240).Simultaneously, the input port and the outside output 158 of the display part 156 that is connected of the output port of this control unit 120 controls real-time decoder 164 interior with being included in real-time video codec 160.Represent as dotted line among Fig. 1, under the output port of this real-time decoder 164 and situation that the input port of record and reproducing part 152 is connected, this control unit 120 can controlling recording and reproducing part 152 to receive the moving picture signals that recovers from real-time decoder 164.
The result is, the moving picture signals that real-time video codec 160 compressed encodings should be taken, and this modulator-demodulator 170 is sent to other side's who is connected with call video equipment in ground during with the fructufy of compressed encoding via telephone wire, and will recover from the moving picture signals that other side's video equipment receives via telephone wire, the moving picture signals after output recovers then is to signal processing unit 150 (step 260).
Simultaneously, if key operation according to the user, what apply from key input part is that phone connect to finish key signals or what apply from modulator-demodulator 170 is the signal that expression will disconnect the call that enters from other side's video equipment, control unit 120 No starting real-time video codecs 160 (steps 270) then, and control will be connected to the display part 156 of output port of signal converter 144 and the input port (step 280) of outside output 158.Then, control unit 120 control modulator-demodulators 170 disconnect calls (step 290), and if call disconnect, return step 220.
Simultaneously, according to many changes of not describing of video camera of the present invention with revise and all belong to technical field of the present invention, to those skilled in the art, and with reference to technological concept of the present invention and the foregoing description, these changes and to revise all be conspicuous.
Below some such change and modifications will be described briefly.Be not limited to send and receive moving picture signals according to video camera of the present invention, and can send and receive the tableaux signal that utilizes still camera to take.Only can send the moving picture signals of shooting according to video camera of the present invention, or only can receive moving picture signals in real time.
Also comprise according to video camera of the present invention: microphone, loud speaker, audio signal processor and multiplexed and dequantisation unit, thus be implemented in the video camera that is used in combination in the visual telephone.Specifically, because audio signal has relatively little data volume, be to realize easily for those of ordinary skills so utilize the method for telephone wire transmission in real time and received audio signal.The structure of this system briefly is described below.Multiplexed and the dequantisation unit of video and audio signal is connected between modulator-demodulator 170 and the real-time video codec 160.Audio signal processor and real-time video codec 160 are connected to multiplexed and dequantisation unit concurrently.Microphone and loud speaker are connected to audio signal processor through input port and output port respectively.Be included in the audio codec that is used for compressed encoding and decoded audio signal in the audio signal processor, be to adopt ITU-T to recommend G.723 under the situation of PSTN at telephone wire, telephone wire be adopt under the situation of ISDN that ITU-T recommends G.711, a kind of G.722 and G.728, thereby make that utilizing telephone wire to send in real time with received audio signal becomes possibility.
As mentioned above, thus according to video camera of the present invention existing video camera and real-time video codec 160 and modulator-demodulator 170 are carried out organic assembling they can be controlled effectively by control unit 120.Consequently, the moving picture signals of shooting can utilize telephone wire to send to the opposing party's video equipment in real time or receive from the opposing party's video equipment.Simplify in the formation of a system according to video camera of the present invention, portable, and the extensive telephone wire that distributes of use, this makes compares with video conferencing system or video-telephone system, can realize cost lower and more easily other side's video equipment is sent and receives moving picture signals in real time.In the technical field that relates to real-time transmission and reception moving picture signals, can predict large-scale commercial effect.
Although described a certain embodiment of the present invention here particularly, under the situation that does not break away from essence of the present invention and scope, can make various improvement obviously.
Claims (8)
1, a kind ofly send moving picture signals in real time respectively via telephone wire and receive the video camera of moving picture signals to external video equipment with from external video equipment, this video camera comprises:
Filming apparatus is used to take an object, and with the moving picture signals of conversion of signals for playing of taking;
The real-time video codec, be used for the moving picture signals of compressed encoding from filming apparatus output, thereby can utilize telephone wire to send moving picture signals in real time and export compressed encoding after result and the moving picture signals that is used for receiving via telephone wire be decoded as moving picture signals before the compressed encoding and the result behind the output decoder in real time;
Modulator-demodulator is used for and will sends to the external video equipment that is connected with telephone wire in real time from the moving picture signals of the compressed encoding of real-time video codec output, and will output to the real-time video codec via the moving picture signals that telephone wire receives;
Signal processor means, be used on screen showing one from the moving picture signals of filming apparatus and real-time video codec, this moving picture signals is outputed to external video equipment, write down this picture signal and neutralize from this moving picture signals of recording medium reproducing to recording medium;
Key input part is used for the key operation according to the user, and the key signals and the telephone number that send and receive the moving picture signals of taking are provided; With
Controller, the phone connection status signal that is used to respond transmission that applies from key input part and the key signals that receives captured moving picture signals and telephone number and applies from modulator-demodulator, control modulator-demodulator, real-time video codec and signal processing apparatus.
2, video camera as claimed in claim 1, wherein said real-time video codec comprises:
The Real Time Compression encoder, be used under the control of controller, will being converted to the digital moving picture signal from the skimulated motion picture signal of described filming apparatus output, the moving picture data amount of compressed encoding as a result after will changing then for utilizing telephone wire to send in real time, and the result behind the output compressed encoding is to described modulator-demodulator; With
Real-time decoder is used for reverting to from the moving picture signals of modulator-demodulator input the moving picture signals before the compressed encoding, and the result of output after recovering is to described signal processing apparatus.
3, video camera as claimed in claim 1, wherein said controller is controlled described modulator-demodulator, apply that phone connects initiating key signal and telephone number or come a call from the outside from key input part if make, then call is connected to the video equipment corresponding with telephone number, and according to the phone connection status signal enabling that applies from modulator-demodulator with ban use of the real-time video codec.
4, video camera as claimed in claim 3, wherein said controller are controlled described signal processor means and are received one of them moving picture signals from described filming apparatus and described real-time video codec selectively according to the phone connection status signal that applies from described modulator-demodulator.
5, video camera as claimed in claim 1, wherein said telephone wire are a kind of in PSTN (PSTN) and the integrated digital business network (ISDN).
6, video camera as claimed in claim 5, wherein said real-time video codec are connected at telephone wire and adopt ITU-T to recommend H.263 under the situation of PSTN, are connected at telephone wire under the situation of ISDN to adopt ITU-T to recommend H.261.
7, video camera as claimed in claim 1 also comprises:
Microphone is used for input audio signal;
Loud speaker is used for output audio signal;
Be connected the multiplexed and dequantisation unit between described modulator-demodulator and the described real-time video codec, be used for multiplexed and multichannel decomposition video and audio signal;
With the parallel audio treatment unit that is connected to described multiplexed and dequantisation unit of described real-time video codec, it has the audio codec of compressed encoding audio signal and decoded audio signal.
8, video camera as claimed in claim 7, wherein said audio codec is connected at telephone wire and adopts ITU-T to recommend G.723 under the situation of PSTN, be connected at telephone wire and adopt ITU-T to recommend G.711 under the situation of ISDN, a kind of G.722 and G.728.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98122841 CN1222030A (en) | 1997-12-27 | 1998-12-18 | Camcorder having real-time tranmission and reception function of moving picture signals |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR75202/97 | 1997-12-27 | ||
| CN 98122841 CN1222030A (en) | 1997-12-27 | 1998-12-18 | Camcorder having real-time tranmission and reception function of moving picture signals |
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| Publication Number | Publication Date |
|---|---|
| CN1222030A true CN1222030A (en) | 1999-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98122841 Pending CN1222030A (en) | 1997-12-27 | 1998-12-18 | Camcorder having real-time tranmission and reception function of moving picture signals |
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| Country | Link |
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| CN (1) | CN1222030A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465147B (en) * | 2007-12-19 | 2011-11-23 | 株式会社日立制作所 | Recording and reproducing apparatus |
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1998
- 1998-12-18 CN CN 98122841 patent/CN1222030A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465147B (en) * | 2007-12-19 | 2011-11-23 | 株式会社日立制作所 | Recording and reproducing apparatus |
| US9325959B2 (en) | 2007-12-19 | 2016-04-26 | Hitachi Maxell, Ltd. | Recording and reproducing apparatus |
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