CN1064184A - Make the device of single-picture TV set picture-in-picture function - Google Patents
Make the device of single-picture TV set picture-in-picture function Download PDFInfo
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- CN1064184A CN1064184A CN91100848A CN91100848A CN1064184A CN 1064184 A CN1064184 A CN 1064184A CN 91100848 A CN91100848 A CN 91100848A CN 91100848 A CN91100848 A CN 91100848A CN 1064184 A CN1064184 A CN 1064184A
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Abstract
Make existing single-image television set under the situation that circuit and structure do not make any changes, increase the device of picture-in-picture function, by son, mother picture TV signal receiving circuit, son, mother picture also television signal processing circuit, control circuit; Several most of formations of TV signal output circuit that comprise PIP, the processing of antithetical phrase picture signal is three components of range value that it are decomposed into the phase difference carrier chrominance signal of luminance signal, carrier chrominance signal, carry out squeezed after the digitized processing, mix mutually with the mother picture TV signal again.What this device output was exported is full tv composite signal and the high-frequency channel signal that comprises PIP.
Description
The present invention relates to a kind of device that makes existing single-picture TV set picture-in-picture function.
Continuous development along with TV tech, various television sets with picture-in-picture function (being many pictures) come out, " color TV principle " book that the typical method of existing techniques in realizing picture-in-picture function can be published referring to publishing house of Southeast China University in 1988, its concrete scheme is to isolate luminance signal and two quadrature color difference signals carry out digital processing from the full tv composite signal of sprite, 3 color difference signals have been decomposited then again, luminance signal and 3 color difference signals of sprite are mixed mutually with the corresponding signal of mother picture, obtain a TV signal that comprises PIP, this TV signal be by 4 fully independently signal constitute.Chinese patent literature disclosed a kind of " television receiver that many pictures the show " (patent No.: CN86105117A), similar to the processing and the said method of sprite carrier chrominance signal.This method has following shortcoming:
Because existing in use single-image television set can only receive high-frequency TV channel signals line from the full tv composite signal of video socket receiver, video from connection socket for antenna, can not receive R-Y, B-Y, G-Y(R=is red, the B=orchid, G=is green, Y=brightness) signal of color difference signal and this form of brightness, so do not change the circuit and the structure of existing television set, utilize prior art just can't make television set increase picture-in-picture function, and, the TV signal R-Y that comprises PIP with the said method acquisition, B-Y, G-Y, Y can not send in closed-circuit television system or the community antenna system and use for the television set in the system, to increase picture-in-picture function.
Purpose of the present invention will propose a kind of technical scheme exactly, thereby under the prerequisite of not changing existing TV set circuit and structure, only need to increase a device, what the output of this device was exported is full tv composite signal and the high-frequency channel signal that comprises PIP, the connection socket for antenna or the video socket of television set are connected with this device, just can make existing single-picture TV set picture-in-picture function.
Realize that concrete technical scheme of the present invention is such: a kind of device that makes the single-picture TV set picture-in-picture function, form (as shown in Figure 1) by following part: sub-screen television signal receiving circuit A1, mother picture TV signal receiving circuit A2, sub-screen television signal treatment circuit A3, mother picture also television signal processing circuit A4, control circuit A5 comprises the TV signal output circuit A6 of PIP; Wherein: the sub-screen television signal treatment circuit is again by demultiplexing circuit, brightness and carrier chrominance signal coding circuit, memory, several parts of brightness and carrier chrominance signal decoding circuit are formed, the technical program is the sub-screen image TV signal to be closed to separate be luminance signal to the processing of sub-screen image TV signal, the phase difference of carrier chrominance signal, three components of the range value of carrier chrominance signal, after carrying out digital coding respectively, deliver to memory and store (writing), under the control of controller, read three digital polarization component then again, after reverting to analog signal after the decoding, be reduced to the image TV signal through a blender again, the output of this device is to comprise the full tv composite signal of PIP and this full tv composite signal is modulated at high-frequency channel signal on the high frequency to television set output, the TV signal output circuit that comprises PIP is by an electronic switch B15, one sound accompaniment band pass filter B16, an one amplitude modulator B17 and a high frequency domain channel oscillator B18 constitute (as shown in Figure 2), what the input of diverter switch was imported is sub-screen image signal and the full tv composite signal of mother picture, what output was exported is a full tv composite signal that includes PIP, the frequency of high frequency domain channel oscillator can be the frequency of the arbitrary channel in whole television channels, demultiplexing circuit in the sub-screen television signal treatment circuit is made up of following part: one with field sync signal, the amplitude separator B3 that controller goes is separated and delivered to line synchronizing signal, luminance signal separated and delivers to the video filter B4 that the luminance coding device goes for one, carrier chrominance signal separated and deliver to the chrominance filter B5 that the chroma decoding device goes for one, audio signal separated and deliver to the sound accompaniment filter B6 that sound accompaniment detector amplifier B7 goes for one.Send into the peak detector C3 that analog to digital converter goes after having a range value with carrier chrominance signal to detect in the carrier chrominance signal coding circuit in the sub-screen television signal treatment circuit; The phase difference value of carrier chrominance signal is converted to magnitude of voltage delivers to amplitude limiter C2, phase comparator C5 and the time device C6 that analog to digital converter C7 goes.A burst separator and a chrominance subcarrier oscillator.There is the amplitude data of the carrier chrominance signal that will from memory B11, take out to change the digital to analog converter C10 of analog signal in the carrier chrominance signal decoding circuit, data selector C9 and phase-shift network C11 that the phase data of carrier chrominance signal is decoded are with the phase difference of carrier chrominance signal and frequency of range value phase adduction output and phase place adder C12 of consistent son picture colour subcarrier signal with the colour subcarrier of mother picture.Have one horizontal synchronizing pulse in the mother picture TV signal and field system chronizing impulse branched away and deliver to the amplitude separator B19 that controller B10 goes in the mother picture also television signal processing circuit, the arrowband wave-wave device B20 that controller goes is separated and delivered to the colored carrier signal of paying of mother picture.Controller B10 discerns two PAL-switch circuit PAL I and the PAL II that writes with read operation by checking colors with impulse phase frequently, for memory provides the address generator DZ of address and is made of the start-stop circuit QT of the control address generator work of the capable field system chronizing impulse co-operate of son, mother picture; The PAL-switch circuit can be operated in NTSL system state or Phase Alternation Line system state, the value that changes the frequency division times N of Fractional-N frequency device D15 in the address generator just can change the size of sprite, changes the position of sprite in mother picture when mother picture in the start-stop circuit is capable just to have changed the television set demonstration towards time of delayer D9 and field system chronizing impulse delayer D10 synchronously.The input of sub-screen television signal treatment circuit has a signal selector B1, and this signal selector is selected the TV signal source of input as sprite under the control of time schedule controller B2.
The course of work of complete machine is such: from receiving of coming in of antenna through sub-screen television signal receiving circuit A1 and from the full tv composite signal of video of outputs such as video recorder, video camera or from the composite video signal of other signal source output, under the control of time schedule controller B2, wherein one road signal enters into sub-screen television signal treatment circuit A3, can be the signal of a signal source of fixing input, also can be to make the input (promptly working with scan mode) in turn of each signal.
When above-mentioned signal enters the split circuit of A3, relevant unit is separated and delivered to split circuit (being made of B3-6) with each composition in the composite signal, wherein, line synchronizing signal HP II, field sync signal VP II, deliver to controller B10, brightness signal Y is delivered to luminance coding device B8, chrominance signal f 2 is delivered to chroma coder B9, and audio signal is delivered to sound accompaniment detector amplefier B7 and output to earphone (or loud speaker) after detection is amplified.
Digital luminance signal of output was stored (writing) for memory B11 after the luminance coding device was encoded the brightness analog signal.
Chroma coder is exported a digital range signal after the amplitude of carrier chrominance signal of simulation and phase place are carried out digital coding respectively | and a F| and a digital phase signal＜F also deliver to memory and store (writing).
The read-write state of memory and corresponding address code are supplied with by controller, memory is when write state, what write is the data that chroma coder and luminance coding device are sent here, when reading, be the brightness data that is stored to be delivered to brightness decoder B12 decode, the amplitude data of carrier chrominance signal and phase data are together sent into chroma decoding device B13 decodes, the luminance signal of the simulation that will obtain and carrier chrominance signal are delivered to addition mixing among the blender B14 then, produce a sprite colour TV image signal.
The full tv composite signal of the television image signal of sprite and mother picture together enters diverter switch B15, diverter switch is inserted the sub-screen image signal in the full tv composite signal of mother picture by regular hour and order under the control of controller, so from diverter switch output is a new composite video signal that comprises PIP, for avoiding diverter switch that the mother picture sound accompaniment is blocked, sound accompaniment band pass filter B16 in parallel makes the straight-through influence that is not subjected to diverter switch of audio signal on diverter switch.
Because antithetical phrase picture signal of the present invention has been taked unique processing method, what device of the present invention was exported is full tv composite signal and the high-frequency channel signal that comprises PIP, no matter so can both under the prerequisite that circuit and structure all do not make any changes, increase picture-in-picture function easily to the single-image television set of existing what model in use, and, will send into closed-circuit television and community antenna system just can make intrasystem user's television set increase picture-in-picture function with the high-frequency TV channel signals that includes son, mother picture image that this method obtains.This device can be directly used in the television set of TSC-system and pal television machine and various line frequency, field frequency standard.
One embodiment of the present of invention, Fig. 2 is the complete machine theory diagram, Fig. 3 is sprite chroma coder and chroma decoding device block diagram, Fig. 4 is the theory diagram of controller, because the present invention and prior art difference mainly are the processing mode of antithetical phrase picture signal, whole working as previously mentioned, again to chroma coder and decoding, the operation principle of controller is further described here.
After the sprite carrier chrominance signal enters encoder, enter at first that colored sync separator C1 is discrete to go out burst signal CP II and chrominance signal f, wherein, burst signal one tunnel is delivered to controller B10 and is gone, the work that chrominance subcarrier oscillator C4 removes control generator is delivered on another road, make it on frequency and phase place, to be consistent with burst signal, carrier chrominance signal one tunnel enters amplitude limiter C2, peak detector C3 is sent on another road, in amplitude limiter, the amplitude of carrier chrominance signal is limited in a fixing height, so output signal is only to have kept original phase change and the constant amplitude phase-modulated signal that do not have changes in amplitude.
In phase comparator (phase discriminator) C5, the phase place of carrier chrominance signal and the phase place of colour subcarrier compare, relatively the phase difference value of back output is a pulse duration, pulse signal series different in size, during this train of impulses entry time/electric pressure converter C6, the output voltage height that pulse duration is long, the output voltage of pulse duration weak point is low, therefore, carrier chrominance signal is at the process amplitude limiter, behind comparator and the transducer, just the size (being phase-shift phase) of the phase difference value in the carrier chrominance signal is converted to the size of magnitude of voltage, available common analog to digital converter carries out depositing among the memory B11 after the digitlization.After the range value of carrier chrominance signal is then directly detected by peak detector, send into analog to digital converter and carry out depositing among the memory B11 after the digitlization.
Phase data＜the F of the carrier chrominance signal of taking out from memory decodes through data selector C9, and its principle is that each data is with gating output circuit correspondingly.
Phase-shift network C11 is made up of a plurality of independent phase-shift circuits, the phase-shift phase of each phase-shift circuit is all different, after the colour of slave controller output is paid carrier wave and is entered phase-shift network, phase shifts will take place, each output branch road of data selector is being controlled a phase shifter in the phase-shift network, therefore, from the phase data of memory output not simultaneously, the output branch road of selector institute gating is also different, therefore, the phase shift momentum that colour subcarrier takes place is also different, so just the digitlization angular rate signal of memory output can be converted to the phase signal of colour subcarrier signal, has finished the numeral one analog demodulator work of colour subcarrier.
The amplitude data of the carrier chrominance signal of coming out from memory | F| exports a changes in amplitude signal behind D/A C10, | F| with＜after F sends into adder C12 simultaneously, both additions have formed the colour subcarrier signal that an amplitude and phase place all change, but at this moment the frequency of color sub-carrier is consistent with the colour subcarrier of mother picture with phase place, has just finished the transfer (colour of PIP synchronously) of colour subcarrier in demodulation.
The effect of controller mainly is the operating state of control memory B11, and provide corresponding address code to memory, the work of controller is the horizontal synchronizing pulse by son, mother picture,, the same pulse in field, burst gating pulse are finished, controller is mainly partly formed by three, i.e. the start-stop circuit QT of PAL identification switch (two identical parts of read-write are arranged), address generator and control address generator.
At first, send each next row signal to when beginning by colored carrier oscillator D1, phase discriminant circuit all will be differentiated, at phase discriminant circuit A(D2) in, discern this delegation and be NTSC capable (promptly not backward) or PAL capable (promptly the row of 180 ° of paraphase), and recognition result informed phase discriminant circuit D4, simultaneously, phase identification circuit B(D3) zone of also memory being prepared to write is that NTSC zone or PAL zone are discerned, and recognition result informed phase discriminant circuit D4, if both unanimities, then judging circuit makes memory B11 place operating state, if both are inconsistent, just makes memory place illegal state, when memory when reading state, also to carry out same identification.
The clock to clock oscillator D16 in the address generator is undertaken synchronous by the mother picture burst signal, to guarantee carrying out synchronously of read-write, clock signal is supplied with address counter D14 behind Fractional-N frequency device D15 frequency division, the frequency dividing ratio of this frequency divider is different when read-write, this frequency dividing ratio is exactly the reduce in scale of sprite, as: during N=3, it is original 1/3 that sprite is reduced into, the sub-screen image signal data of image frame size that has been reduced that writes memory.
The start-stop circuit of control address generator work is the capable field system chronizing impulse share operations by son, mother picture, the horizontal synchronizing pulse HP I of mother picture enters delay circuit D9 after time delay, be sent to address enable device D11 again, the field system chronizing impulse VP I of mother picture enters delay circuit D10 after time delay, enter read-write controller D12, the horizontal synchronizing pulse HP II of sprite directly is sent to D11, and field system chronizing impulse VP II is directly delivered to D12.The read-write state of field system chronizing impulse decision memory, the field system chronizing impulse of sprite makes memory be in write state, and the frequency division number of times of Fractional-N frequency device is increased.The field system chronizing impulse of mother picture makes memory be in the state of reading, and the frequency division number of times of Fractional-N frequency device is reduced, the primary address register is all started in each horizontal synchronizing pulse, and the output of address counter is subjected to the control of judging circuit D4, only when judging circuit makes memory in running order, address counter D14 just has on the address wire that outputs to memory B11, and after finishing the signal that runs through delegation, counter quits work automatically.
When memory was in read-write state, the function circuit D13 of diverter switch was synchronoused working with address enable device D11, and promptly every row switches once, and the bundle picture signal inserts in the composite video signal of mother picture.
Claims (8)
1, a kind of device that makes the single-picture TV set picture-in-picture function is made up of following part: the mother picture TV signal receiving circuit; The sub-screen television signal receiving circuit; The mother picture also television signal processing circuit; The sub-screen television signal treatment circuit, control circuit; The TV signal output circuit that comprises PIP, and the sub-screen television signal treatment circuit is by demultiplexing circuit, brightness and carrier chrominance signal coding circuit, memory, several parts of brightness and carrier chrominance signal decoding circuit are formed, it is characterized in that: the processing of antithetical phrase picture image TV signal is that the sprite image TV signal is decomposed into luminance signal, the phase difference of carrier chrominance signal, three components of the range value of carrier chrominance signal, after carrying out digital coding respectively, deliver to memory and store (writing), under the control of controller, read three digital polarization component then again, after reverting to analog signal after the decoding, be reduced to image TV signal through a blender again.The output of this device is to comprise the full tv composite signal of PIP and this full tv composite signal is modulated at high-frequency channel signal on the high frequency to television set output.
2, device according to claim 1, it is characterized in that: the output circuit of this device is by an electronic switch, one sound accompaniment band pass filter, one amplitude modulator and a high frequency domain channel oscillator constitute, what the input of diverter switch was imported is sprite picture intelligence and the full tv composite signal of mother picture, what output was exported is a full tv composite signal that includes PIP, and the frequency of high frequency domain channel oscillator can be the frequency of the arbitrary channel in whole television channels.
3, device according to claim 1, it is characterized in that: the demultiplexing circuit in the sub-screen television signal treatment circuit is made up of following part: one is come out and delivers to the amplitude separator that controller goes field sync signal, line synchronizing signal are discrete, luminance signal is separated and deliver to the video filter that the luminance coding device goes for one; Carrier chrominance signal separated and delivers to the chrominance filter that the chroma decoding device goes for one; Audio signal separated and delivers to the sound accompaniment filter that the sound accompaniment detector amplifier goes for one.
4, device according to claim 1 is characterized in that: send into the honeybee value wave detector that analog to digital converter goes after having a range value with carrier chrominance signal to detect in the carrier chrominance signal coding circuit in the sub-screen television signal treatment circuit; With the phase difference value of carrier chrominance signal be converted to magnitude of voltage deliver to amplitude limiter that analog to digital converter goes, phase comparator and the time device.A burst separator and a chrominance subcarrier oscillator.
5, device according to claim 1 is characterized in that: have the amplitude data of the carrier chrominance signal that will take out from memory to change the digital to analog converter of analog signal in the carrier chrominance signal decoding circuit in the sub-screen television signal treatment circuit; Data selector and phase-shift network that the phase data of carrier chrominance signal is decoded are with the phase difference of carrier chrominance signal and frequency of range value phase adduction output and phase place adder of consistent sprite colour subcarrier signal with the colour subcarrier of mother picture all.
6, device according to claim 1 is characterized in that: have one horizontal synchronizing pulse in the mother picture TV signal and field system chronizing impulse separated and deliver to the amplitude separator that controller goes in the mother picture also television signal processing circuit; Pay that carrier signal is discrete comes out and deliver to the narrow filter that controller goes with mother picture is colored.
7, device according to claim 1, it is characterized in that: control circuit is by discerning two PAL-switch circuit that write with read operation to the burst gating pulse phase place, for memory provides the address generator of address and is made of the start-stop circuit of the control address generator work of the capable field system chronizing impulse co-operate of son, mother picture.The PAL-switch circuit can be operated in NTSL system state or Phase Alternation Line system state, the value that changes the frequency division times N of Fractional-N frequency device in the address generator just can change the size of sprite, the position of sprite in mother picture when the time of mother picture horizontal synchronizing pulse delayer and field system chronizing impulse delayer has just changed the television set demonstration in the change start-stop circuit.
8, device according to claim 1 is characterized in that: the input of sub-screen television signal treatment circuit has a signal selector, and this signal selector is selected the TV signal source of input as sprite under time schedule controller control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91100848A CN1064184A (en) | 1991-02-05 | 1991-02-05 | Make the device of single-picture TV set picture-in-picture function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91100848A CN1064184A (en) | 1991-02-05 | 1991-02-05 | Make the device of single-picture TV set picture-in-picture function |
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| CN1064184A true CN1064184A (en) | 1992-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN91100848A Pending CN1064184A (en) | 1991-02-05 | 1991-02-05 | Make the device of single-picture TV set picture-in-picture function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330174C (en) * | 2002-03-29 | 2007-08-01 | 皇家飞利浦电子股份有限公司 | Television receiving system |
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1991
- 1991-02-05 CN CN91100848A patent/CN1064184A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330174C (en) * | 2002-03-29 | 2007-08-01 | 皇家飞利浦电子股份有限公司 | Television receiving system |
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