CN1072052A - Chroma-under chrominance channe with the auxiliary signal coding - Google Patents
Chroma-under chrominance channe with the auxiliary signal coding Download PDFInfo
- Publication number
- CN1072052A CN1072052A CN 91110559 CN91110559A CN1072052A CN 1072052 A CN1072052 A CN 1072052A CN 91110559 CN91110559 CN 91110559 CN 91110559 A CN91110559 A CN 91110559A CN 1072052 A CN1072052 A CN 1072052A
- Authority
- CN
- China
- Prior art keywords
- carrier
- signal
- phase place
- modulated
- carrier wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
A kind of have with the video signal processing system of the chrominance carrier of chrominance information modulation and the method for operating this system.The characteristics of this system are to comprise with lower device: in response to the device of described chrominance carrier in order to generation phase place alternation carrier wave; Thereby make 180 ° of the phasic differences mutually on alternate scan line of described phase place alternation carrier wave and described chrominance carrier, in order to first auxiliary signal is modulated at the device on the described phase place alternation carrier wave; And in order to described modulated phase place alternation carrier wave and device by the described modulated chrominance carrier addition at given phase angle.
Description
The present invention puts it briefly and relates to the apparatus and method that are used to handle the vision signal that comprises carrier chrominance signal and luminance signal.The present invention relates in particular to channel independently and write down handled vision signal in the video tape recorder of colourity on tape.
In video system, it has been known that the carrier chrominance signal that appears at the high end position of videoblankingsync frequency spectrum usually is modulated to the position that is lower than the luminance signal frequency spectrum.This modulation or in video technique, be called chroma-under formula register system (color-under recording system) to low conversion (down conversion) system.In this chroma-under formula system, the homophase of chrominance information (I) component and quadrature (Q) component are to handle with traditional mode, provide the colour signal of watching scene (C) with formation.
In the colored video technique of cassette tape, need to provide additional channel, so that transmit the auxiliary signal useful, for example signal of digital accompaniment information and/or the relevant motion that in video scene, is taken place to colour TV signal.
The present invention has adopted the chroma-under chrominance channe with its best form, to transmit for example digital accompaniment signal and/or the clear additional information that is presented at the signal of the motion that is taken place in the scene of watching.
From 3.58 traditional megahertzes (=455fh/2) chrominance carrier is by to the multiplexing in the ranks (line to line multiplexing) of this carrier wave and 180 ° of phase shifted version thereof and produce a kind of phase place alternation carrier wave (PAC).Therefore phase place alternating download phase of wave is for the phase place of the chrominance carrier on the alternate row, 180 ° of phase phasic differences, that is be homophase not on the odd-numbered line, and homophase on the even number line.
Phase place alternation carrier wave is modulated with first auxiliary signal, and a kind of phase place alternation carrier wave of 90 ° of phase shifts is modulated with second auxiliary signal.These two kinds modulated phase place alternating download phases of wave are added and a kind of signal that is referred to herein as phase place alternating signal (PAS) is provided.The phase place alternating signal is added on traditional modulation chrominance carrier, and the latter is referred to herein as carrier chrominance signal (C).These two kinds of signal sums are called " carrier chrominance signal of enhancing " in this article.In the VHS system, the carrier chrominance signal of enhancing be by 629 kilo hertzs (=40fh) frequency as the chroma-under signal to modulated (downmodulated).The carrier chrominance signal that strengthens is sent to recording medium together with treated luminance information signal or by other transmission medium that real-time mode is utilized, perhaps is stored on the tape or other storage media that uses when needing later on.
The carrier chrominance signal that strengthens decoded (heavily imitating), its method is mainly reversed cataloged procedure by a network of being made up of adder and line delay circuit, thereby carrier chrominance signal (C) and phase place alternating signal (PAS) are separated, so that respectively each independently output original colourity and auxiliary signal are provided, supply the usefulness of replay device on demand.
Fig. 1 is the block diagram of enforcement chroma-under formula of the present invention system;
Fig. 2 is expression being used to decode or the reset block diagram of system of the chroma-under carrier chrominance signal that strengthens;
The schematic diagram of the relative position of Fig. 3 chroma vector that to be expression decompose out from corresponding I and Q signal and auxiliary signal;
Fig. 4 is an embodiment who is used for the auxiliary signal decoder of two kinds of auxiliary signals; And
Fig. 5 is another embodiment that only is used for a kind of auxiliary signal demodulator of auxiliary signal.
This specification is that the TV signal processing system utilizing which of the NTSC standard that adopts according to the U.S. is described.Yet it mainly is the Phase Alternation Line system that adopts in Europe that principle of the present invention also can be applied to.In addition, the present invention also can be used for color TV transmission or register system, and in these systems, carrier chrominance signal is not staggered according to standard N TSC color television system and luminance signal.
With reference to Fig. 1 block diagram that is used for illustrating most preferred embodiment of the present invention.The signal source 10 and brightness/chroma (Y/C) separator 12 of the vision signal of digital form are coupled, and separator 12 provides luminance signal (Y) to luminance processor 14, and provides carrier chrominance signal (C) to 3.58 megahertz chrominance carrier oscillators 16.The Y/C separator preferably has the pattern that adopts carrier chrominance signal 1-H pectination.The luminance processor 14 of the traditional form that is adopted in recorded-video technique provides FM modulated luminance signal, and the latter is coupled to adder 18.
Carrier chrominance signal (C) is coupled to oscillator 16 and adder 42.16 on chrominance carrier oscillator is in response to the burst gating pulse that comes motor synchronizing separator 24 on the line 25.Chrominance carrier oscillator 16 produces continuous wave (WC) carrier wave of 3.58 megahertzes, its frequency and phase locking on line 25 by the colour burst input signal of burst gating pulse institute gating.Thereby oscillator 16 provides the 3.58 megahertz continuous waves through colourity burst locked (chroma-burst-locked) of 0 ° of phase place to 20 and 180 ° of phase shifters 22 of multiplexer (MUX).
In most preferred embodiment, leading 57 ° or lag behind 33 ° of the angles of MUX output with respect to 3.58 megahertz benchmark chrominance carriers, this mainly is because system takes this implementation method cost low relatively.Yet,, may be desirable to provide different phase places for some purposes.In addition, the phase place for PAC provides the function of horizontal line selection to realize in programmable read-only memory (prom).PROM can provide accurate and noiseless PAC.
Preferably low pass 1-H pectination, on a phase place, modulate by the PAC of 34 pairs of LUT30 outputs of modulator from the auxiliary signal AUX1 of signal source 32, modulator 34 is coupled with one of them input of adder 36.When needing, by preferably also be low pass 1-H pectination the second auxiliary signal AUX2 to from LUT30 and through the PAC of 90 ° of phase shifts of phase shifter 41 according to modulate (differing for 1/4 cycle) with signal AUX1 quadrature on phase place.Signal AUX1 can obtain from monophony or stereo TV sound system (not shown), the digital accompaniment signal through suitably encoding.
In addition, second auxiliary signal can be the control signal that is used for the operation replay system.Sort signal can be the motor message of the motion that occurred in the video scene of expression.Adopt proper technology as known in the art can obtain any signal in two kinds of auxiliary signals.Other control signal can be used to encode on phase place alternation carrier wave (PAC), and this is very clearly for a person skilled in the art.The optimised form of auxiliary signal decoder will be described together with Fig. 2,4 and 5.
Be loaded with phase place alternation carrier wave (PAC) addition in adder 36 of the corresponding modulation of auxiliary signal AUX1 and AUX2, its output is coupled with the input of adder 42.Second input of adder 42 is coupled with the carrier chrominance signal (C) that is obtained from separator 12.The output of adder 42 is the carrier chrominance signals that strengthen, and synthesis phase alternation carrier wave that auxiliary signal encodes formed by planting with the carrier chrominance signal of chrominance information coding and with one (or two) for it.The present invention can be applied to color television transmission system, and carrier chrominance signal is not staggered according to standard N TSC color television system and luminance signal in this system.
Yet optimised form of the present invention is to be used for the video system that delivering path is a tape.The frequency bandwidth of used tape is restricted in this industry at present, thereby determined that chrominance carrier should be with the setting of so-called chroma-under form, thereby make the signal of the output that is equivalent to adder 42 in modulator 44, be modulated to the frequency spectrum that is lower than luminance channel again.Generally, the chroma-under carrier wave in the VHS system, be in 629 kilo hertzs (=40fh).
The device that produces chroma-under form signal is just described now.The output of the adder of being formed by carrier chrominance signal (C) with from the PAS signal of adder 36 42 is by being coupled to the first input end of modulator 44 on the line 43.Being added on modulator 44 second inputs is 4.21 megahertz carrier signals, and this signal is the output of the band pass filter BPF47 that is coupled of the output with modulator 46.Band pass filter BPF47 only transmits the sideband of 4.21 megahertzes to modulator 44.Modulator 46 has two inputs: from 0 ° of phase place continuous wave chrominance carrier of oscillator 16, and 629 kilo hertzs of (=40fh) carrier wave outputs after the process capable 90 ° of phase shifters of every H (90 °-phase shifter/H-line) 49a.The frequency of 629 kilo hertzs of carrier waves and phase locking are on video input signals, since phase shifter be with 629 kilohertz oscillator 48 and with from video tape recorder, obtained 30 hertz of switching signals of two magnetic track records are coupled on the tape in order to discern, at this, oscillator 48 is that the horizontal-drive signal H that is subjected to from video being obtained controls.The modulation products of modulator 44 has carrier chrominance signal and the auxiliary signal that is modulated on 3.58 megahertz carrier waves ± 4.21 megahertz carrier waves.51 of low pass filters allow 629 kilo hertzs sideband pass through.629 kilo hertzs of carrier waves are called as the chroma-under carrier wave.The chroma-under signal that is exactly among the present invention to be adopted through 629 kilohertz signal of ovennodulation.Transmit chroma-under signal and FM luminance signal by adder 18, so that be recorded on the tape.Thereby the input signal that is added on the video tape recorder is made up of FM luminance signal and two kinds of chroma-under carrier waves modulating with carrier chrominance signal and auxiliary signal respectively.
Those skilled in the art will appreciate that, be with by 0 ° and 90 ° chrominance carrier to be carried out chopping phase with I and Q chromatic component respectively in order to produce carrier chrominance signal similar for the processing of the phase place alternation carrier wave for the treatment of to modulate with one or both auxiliary signals.Therefore modulation auxiliary signal of the present invention is that I and Q signal with traditional carrier chrominance signal similarly is in quadrature condition.
Further specify the working condition of Fig. 1 system now in conjunction with the vectogram of Fig. 3.The phase place of each carrier wave increased when the vectogram of two kinds of carrier waves (colourity and PAC) and table I hereinafter and II shown in Fig. 3 were all expressed through the work of two frames and several rows.Under traditional working condition, according to the TSC-system standard, 3.58 megahertz carrier waves are 180 ° of each consecutive line phase place alternations that is scanned during first and second beginning, respectively first row of first frame of video and the 263rd capable on, the phase place of chrominance carrier is in 0 °.When first and second of second frame began, the phase place of chrominance carrier was in-180 °.Will be appreciated that in addition the phase place of PAC when first frame and each beginning of second frame all is in 0 °.In the table I these phase values have been shown.
The table I
3.58 the phase place of MHz
Chrominance carrier and phase place alternation carrier wave (PAC)
Beginning chrominance carrier phase place alternation carrier wave
0 ° 0 ° of the 1st the 1st row of the 1st frame
0 ° 0 ° of the 2nd the 263rd row
-180 ° 0 ° of the 1st the 1st row of the 2nd frame
-180 ° 0 ° of the 2nd the 263rd row
The relative position of I and Q vector and auxiliary signal 1 and 2 vectors has been shown among Fig. 3.In this embodiment, the value that is represented as the phase angle N of the signal AUX of S1 and S2 and AUX2 among Fig. 3 is identical with the phase angle of I and Q signal.As mentioned above, N can be any desirable value.If other probable value of illustration N, figure can be complicated more, and also nonessential for the working condition of understanding system, because this is very clearly to one skilled in the art.
Can see that the position of I and Q vector remains unchanged with respect to colourity colour burst vector, yet should understand, it is an alternation in the ranks.Owing to the PAC that is loaded with auxiliary signal AUX1 and AUX2 is changing with respect to chrominance carrier, as shown in Figure 3, auxiliary signal on odd-numbered line with I and Q signal homophase, homophase not on even number line.
Understanding to the VHS standard is depended in the progressive analysis of phase place of 629 kilo hertzs chroma-under chrominance carriers, under the VHS standard, opposite processing is done in 90 ° of the capable hysteresis of the phase angle of 629 kilo hertzs of carrier waves every H for first then, capable 90 ° in advance of phase angle every H for second.Tabulation and details for these phase change see also the table II.
As show in the II specified, chroma-under formula PAC carrier wave on the odd-numbered line of first frame with chroma-under chrominance carrier homophase, then 180 ° of phase phasic differences on even number line, this is because the be tied cause of ground alternation of PAC carrier phase as mentioned above.The table II shows in a frame in any given adjacent two row, and two kinds of 629 kilo hertzs of carrier waves are homophase not in delegation always, and on another row homophase.For chroma-under pattern as shown in Figure 3, I keeps identical with the Q vector with the relative position of auxiliary signal vector S1 and S2.Will be appreciated that the table II relates to unmodulated carrier wave.
The table II
629 kilo hertzs of chroma-under carrier waves: colourity and PAC
(IP: homophase OP: not homophase)
3.58MHz 629KHz 629KHz 3.58MHz VHS colour
Colourity colourity PAC PAC underlying carrier wave
0 ° 0 ° 0 ° of 0 ° of 0 ° of IP of the 1st the 1st row of first frame
90 ° 0 ° 90 ° of 180 ° of-90 ° of OP of the 2nd row
180 ° 0 ° 180 ° of 0 ° of 180 ° of IP of the 3rd row
180 ° of 90 ° of OP-90 of the 4th row ° 0 ° 270 °
(-180°) (-90°)
0 ° 0 ° 0 ° of 0 ° of 0 ° of IP of the 2nd the 263rd row
180 ° of 90 ° of OP-90 of the 264th row ° 0 °-90 °
0 ° of 180 ° of IP-180 of the 265th row ° 0 °-180 °
180 ° of-90 ° of OP+90 of the 266th row ° 0 °-270 °
(+90°)
0 ° 0 ° 0 ° of 180 ° of 180 ° of OP of first the 1st row of second frame
90 ° 0 ° 90 ° of 0 ° of 90 ° of IP of the 2nd row
180 ° 0 ° 180 ° of 180 ° of 0 ° of OP of the 3rd row
0 ° of-90 ° of IP-90 of the 4th row ° 0 ° 270 °
(-90°)
0 ° 0 ° 0 ° of 180 ° of 180 ° of OP of second the 263rd row
0 °-90 ° IP-90 ° 0 °-90 ° of the 264th row
180 ° of 0 ° of OP-180 of the 265th row ° 0 °-180 °
90 ° 0 °-270 ° of 0 °+90 ° IP of the 266th row
(+90°)
Consult the optimised form of the playback decoder of Fig. 2.Fig. 2 has represented to adopt the block diagram of decoder of the present invention or playback system.FM brightness is added on the line 100 with 629 kilo hertzs of carrier waves modulating with colourity and auxiliary signal, and 100 on line is coupled with low pass filter 102 and high pass filter 104 respectively.High pass filter 104 is sent to known brightness processed circuit 106 to the FM luminance signal.
Therefore, after auxiliary signal information was eliminated by adder 112, carrier chrominance signal was sent to a suitable color processing demodulator 118 by line 116, and demodulator 118 provides baseband I and Q chrominance component to colored use device 120.A kind of suitable colour decoder 118 is being submitted on the same day with the application, transfer in the patent application of commonly-assigned us and be described, this application (case number: AML1014) all wait for trial with the application, this application is the invention according to J.W.KO and C.B.Patel, inscribes one's name to be " correct phase that recovers colourity by dividing other path and luminance signal concerns the device of usefulness " (Apparatus for restoring the correct phase relation of the chroma and luminance signals passed through separate paths).
Only be resumed by the output of 629 kilo hertzs of carrier waves of auxiliary signal AUX1 and AUX2 modulation as adder 114, and deliver to auxiliary signal processor 124, processor 124 carries out demodulation to the PAC with the auxiliary signal coding, and it is, used when supply and demand is wanted by independently providing these signals on the output 126 and 128.
A kind of processor 124 of the best has been shown among Fig. 4.The carrier chrominance signal and the 1-H delay line 111 that strengthen are coupled, and are coupled with an input of adder 114.The signal of 1-H time-delay is added to another input of adder 114.The output of adder 114 is the PAS signals that are sent to an input separately of modulator 130 and 132 by line 122.Color carrier generator 16 is added to N ° of phase shifter 134 by the output of path 133, and then is added to multiplexer 136.Multiplexer 136 directly provides a capable separator to modulator 130 in the mode similar to the MUX 20 of Fig. 1 encoder, perhaps provides a capable separator via 90 ° of phase shifters 138 to modulator 132.Modulator 130 and 132 pairs of carrier waves through coding carry out demodulation, so that isolate corresponding auxiliary signal AUX 1 and AUX2 after by low pass filter 140 and 142.Auxiliary signal demodulator shown in Fig. 4 or processor can be used to two kinds of auxiliary signals of demodulation, even and have only a kind of auxiliary signal to be separated timing and also can use.Yet, can adopt the more effective circuit of a kind of simplification as shown in Figure 5 for having only a kind of auxiliary signal system to be demodulated.
In Fig. 5, in response to the carrier chrominance signal that strengthens, the PAS signal that only contains a kind of auxiliary signal is by 1H delay circuit 111 and adder 114.Its output with by absolute value wave detector 152(PROM for example) envelope detector 150 formed is coupled, is coupled with low pass filter 154 then.Last output is exactly the auxiliary signal that is provided on the signal source 32 or 38 among Fig. 1.
Although be that present invention is described by reaching the chroma-under carrier wave that is modulated to 629 kilo hertzs thereafter with 3.58 megahertz chrominance carriers, the present invention also can be by being implemented with directly modulating 629 kilo hertzs of carrier wave base band carrier chrominance signals.
In addition, for system such as PAL, β magnetic tape format, and chrominance carrier is the similar system of using the phase relation different with above-mentioned VHS form to encode, and the present invention can be implemented with the coding alternation carrier wave with respect to chrominance carrier phase place alternation in these systems.
Described herein embodiments of the invention at first make the carrier wave alternation, with one or both auxiliary signals carrier wave are encoded then.Obviously this process can be reversed for a person skilled in the art.Like this, can modulate carrier wave with needed auxiliary signal earlier, then carrier wave be carried out the phase place alternation.Others are then abideed by said method.
In addition, although the present invention is described, to one skilled in the art, also be to understand easily by other application that claims limited with regard to the various application of illustrative specific embodiment.
Claims (28)
1, a kind of video signal processing system that has with the chrominance carrier of chrominance information modulation is characterized in that:
In response to described chrominance carrier in order to producing the device of phase place alternation carrier wave, thereby make 180 ° of the phasic differences mutually on alternate scan line of described phase place alternation carrier wave and described chrominance carrier;
In order to first auxiliary signal is modulated at the device on the described phase place alternation carrier wave; And
In order to described modulated phase place alternation carrier wave and device by the described modulated chrominance carrier addition at given phase angle.
2, according to the system of claim 1, it is characterized in that, in response to described chrominance carrier and described phase place alternation carrier wave, a kind ofly reach the modulating device of the chroma-under chrominance carrier of 180 ° of interframe paraphase in the ranks in order to produce, thereby make described chroma-under phase place alternating download phase of wave for 180 ° of described chroma-under chrominance carrier phase phasic differences with respect to described chrominance carrier.
3,, it is characterized in that also comprising in order to second auxiliary signal and described phase place alternating download phase of wave are added, thereby make described modulated phase place alternation carrier wave contain the device of described first and second auxiliary signals according to the system of claim 1.
According to the system of claim 1, it is characterized in that 4, described phase place alternating download wave generation device is made up of PROM.
According to the system of claim 1, it is characterized in that 5, described first auxiliary signal is the digital accompaniment signal.
According to the system of claim 5, it is characterized in that 6, described audio signal comprises the frequency division multiplexing signal that one or more audio signals are formed.
According to the system of claim 1, it is characterized in that 7, described first auxiliary signal is the signal of expression motion in described vision signal.
According to the system of claim 3, it is characterized in that 8, described first auxiliary signal is the digital accompaniment signal, and described second auxiliary signal is the signal of expression motion.
According to the system of claim 2, it is characterized in that 9, described phase place alternating download phase of wave is 0 ° for the phase place of described chroma-under carrier wave.
10, a kind of operation has the method for the video signal processing system of the chrominance carrier of modulating with chrominance information, it is characterized in that comprising following all steps:
Produce a kind of phase place alternation carrier wave in response to described chrominance carrier, thereby make described phase place alternating download phase of wave for 180 ° of described chroma-under chrominance carrier phase phasic differences with respect to 180 ° of described chrominance carrier paraphase in the ranks;
Modulate described phase place alternation carrier wave with first auxiliary signal;
With the described modulated phase place alternation carrier wave and the described chrominance carrier addition at given phase angle.
11, according to the method for claim 10, it is characterized in that,
In response to described modulated chrominance carrier and described modulated phase place alternation carrier wave and produce a kind of with respect to described look rate the chroma-under chrominance carrier of 180 ° of carrier wave paraphase in the ranks, thereby make described modulated chroma-under phase place alternating download phase of wave for 180 ° of described chroma-under chrominance carrier phase phasic differences.
12, according to the method for claim 10 or 11, it is characterized in that further comprising the steps of: by the phase place alternation carrier wave of the second auxiliary signal quadrature modulation as secondary signal and described first signal plus, thereby make described code signal include described first and second auxiliary signals.
According to the method for claim 10, it is characterized in that 13, the described first signal modulation step comprises with the digital accompaniment signal modulates described phase place alternation carrier wave.
According to the method for claim 13, it is characterized in that 14, described audio signal is made up of the time-division multiplex transmission carrier wave that contains one or more audio signals.
15,, it is characterized in that comprising and use described first signal of forming by the signal of representing the video scene motion to modulate the step of described phase place alternation carrier signal according to the method for claim 10.
16, a kind of video signal preprocessor with chrominance carrier of the chrominance information of being subjected to modulation is characterized in that,
In response to described chrominance carrier, in order to produce the device of phase place alternation carrier wave;
In order to first auxiliary signal is modulated at respect to described chrominance carrier in the ranks with the described phase place alternation carrier wave of 180 ° of interframe paraphase on device, thereby make described modulated phase place alternating download phase of wave for 180 ° of described chroma-under chrominance carrier phase phasic differences;
In order to the device of the described chrominance carrier addition at described modulated phase place alternation carrier wave and given phase angle, thereby provide and the synthetic described chrominance carrier of the described modulated phase of wave of alternating download mutually with described first auxiliary signal modulation; And
In response to described modulated phase place alternation carrier wave and described chroma-under carrier wave, use so that described chrominance carrier and described first auxiliary signal are separated into separately the independently device of delivery channel.
17, according to the processor of claim 16, it is characterized in that, in response to described chrominance carrier and described modulated phase place alternation carrier wave, correspond respectively to the modulating device of the modulated chroma-under carrier wave of described modulated chrominance carrier and modulated phase place alternation carrier wave in order to generation.
18, according to the processor of claim 16, it is characterized in that, described separator comprises the 1-H delay line, the latter is coupled with synthetic modulated carrier and with a pair of adder that is disposed, provide this two modulated carrier sums with the output of a described adder therein, and providing the poor of described two modulated carriers at the output of another described adder, this each adder is coupled at the output of described 1-H delay line and the carrier wave of this time-delay.
19, according to the processor of claim 17, it is characterized in that also comprising in order to modulate the device of described chroma-under phase place alternation carrier wave by second auxiliary signal, thereby make described auxiliary signal comprise described first and second auxiliary signals, described separator is separated to described modulated phase place alternation carrier wave and described modulated chrominance carrier separately independently in the channel.
20, according to the processor of claim 19, it is characterized in that, described separator comprises the 1-H delay line, the latter and modulated synthetic carrier wave and be coupled with a pair of adder that is disposed, provide this two modulated carrier sums with the output of a described adder therein, and providing the poor of described two modulated carriers at the output of another described adder, this each adder is coupled at the output of described 1-H delay line and the carrier wave of this time-delay.
21,, it is characterized in that also comprising with so that the device of described first auxiliary signal and chroma-under phase place alternation carrier wave demodulation, so that make described first auxiliary signal and chroma-under carrier wave demodulation according to the processor of claim 18.
22, in a kind of system with the signal that obtains along parallel scan line, in order to the modulation of two kinds of carrier waves is sent to the equipment of remote location, described equipment comprises in order to modulated first carrier and modulated second carrier wave are carried out apparatus for encoding, it is characterized in that described equipment comprises:
Modulated first carrier source, described first carrier are when its unmodulated state, along 180 ° of the phase phasic differences on the corresponding points of each consecutive line;
The second modulated carrier source, described second carrier wave are when its last modulation condition, along being homophase on the capable corresponding points of each successive scanning; And
The adder that is coupled with described carrier source.
23,, it is characterized in that also comprising according to the equipment of claim 22:
Be coupled with described adder, in order to the first and second described modulated carrier waves that reappear are sent to the device of remote point.
24,, it is characterized in that also comprising according to the equipment of claim 23:
1-H time-delay mechanism with one scan line delay, described time-delay mechanism have input and the output with described remote some coupling;
Described device has respectively the input that the output with described remote point and described time-delay mechanism is coupled, in order to provide and the corresponding signal of the described second phase place alternation carrier wave chopping phase; And
Has respectively the substracting unit that the output with the paraphase output of described remote point and described time-delay mechanism is coupled, in order to provide and the corresponding signal of the described first phase place alternation carrier wave chopping phase.
According to the equipment of claim 22, it is characterized in that 25, described modulated phase place alternation carrier wave has the quadrature component of modulating with first and second auxiliary signals respectively.
According to the equipment of claim 22, it is characterized in that 26, described first and second carrier waves have same frequency.
According to the equipment of claim 22, it is characterized in that 27, described first carrier is the NTSC colour TV system subcarrier, and the described second phase place alternation carrier wave have the step rate identical with described colour subcarrier.
According to the equipment of claim 27, it is characterized in that 28, the described device that the first and second described modulated carrier waves that reappear is sent to described remote point comprises:
Be different from the device of the signal modulation of the described first or second phase place alternating download wave frequency with frequency, so that produce the described modulated first and second colour phase alternation carrier waves of reproduction with different frequencies by the signal that described adder provided;
The tape deck of the signal that provides by described modulation is provided writing down by coupling;
Be coupled with described recording process, in order to produce the device of the carrier wave that has identical phase relation with going together mutually of the described modulated first and second phase place alternation carrier waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91110559 CN1072052A (en) | 1991-10-31 | 1991-10-31 | Chroma-under chrominance channe with the auxiliary signal coding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91110559 CN1072052A (en) | 1991-10-31 | 1991-10-31 | Chroma-under chrominance channe with the auxiliary signal coding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1072052A true CN1072052A (en) | 1993-05-12 |
Family
ID=4910154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91110559 Pending CN1072052A (en) | 1991-10-31 | 1991-10-31 | Chroma-under chrominance channe with the auxiliary signal coding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1072052A (en) |
-
1991
- 1991-10-31 CN CN 91110559 patent/CN1072052A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4944032A (en) | Multiplex signal processing apparatus | |
| US4476484A (en) | Technique for providing compatibility between high-definition and conventional color television | |
| US4831463A (en) | Video processing in which high frequency luminance components are folded into a mid-band spectrum | |
| US4879606A (en) | EDTV recording apparatus | |
| US4631574A (en) | Compatible high-definition television with extended aspect ratio | |
| WO1985005002A1 (en) | Semi-compatible hdtv signals for transmission over two catv channels | |
| US4589011A (en) | Single sideband modulated chrominance information for compatible high-definition television | |
| CN1046392C (en) | Time-base correction in a video recording/playback system | |
| WO1986007226A1 (en) | Method and apparatus for creating encrypted and decrypted television signals | |
| US4622578A (en) | Fully compatible high definition television | |
| US4630099A (en) | Time multiplexing chrominance information for compatible high-definition television | |
| JPH02145088A (en) | High-accuracy mac amplitude modulation television transmission system | |
| CN1015856B (en) | Extended definition widescreen television system using plural signal transmission channels | |
| US4564857A (en) | Aspect ratio improvement for compatible high-definition television | |
| US4873567A (en) | Extended horizontal resolution of luminance and chrominance in a high definition television system | |
| CN1072052A (en) | Chroma-under chrominance channe with the auxiliary signal coding | |
| EP0516359B1 (en) | Widescreen television signal processing apparatus | |
| CA1331806C (en) | Apparatus with an inverse nyquist filter for processing vestigial multiplex signals in quadrature | |
| JP2621730B2 (en) | Wide screen television signal transmission device and reception device | |
| CN1025100C (en) | Signal processing apparatus for widescreen television system | |
| JPH05304680A (en) | Magnetic recording and reproducing device for video signal | |
| CN1051652A (en) | Signal processing apparatus for widescreen television system | |
| JPH0430798B2 (en) | ||
| JPH02170789A (en) | Video signal recorder | |
| JPH0828894B2 (en) | Television signal processing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |