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公开(公告)号：EP0178868A3
公开(公告)日：1988-08-17
申请号：EP85307312
申请日：1985-10-11
CPC分类号： H04N9/79 , H04N9/7921 , H04N9/831
摘要： A chrominance signal processing apparatus used for such as the color television signal recording and reproducing apparatus (VTR) to record and reproduce a color television signal, comprises means (2,3,26,17,24) for converting a carrier chrominance signal (fsc) to a low-band signal (fc) for recording, and, for reproduction, means (27,16,13) for reconverting the converted low-band signal (fc) to the carrier chrominance signal (fsc) of the original color subcarrier frequency, to thereby record and reproduce the chrominance signal. Means (40, 41, 42, 43) for detecting the burst in the carrier chrominance signal (fsc) necessary for the level adjustment of the chrominance signal or for the control of the conversion frequency or for discrimination of black and white signal under a state of the low-band converted chrominance signal during recording and reproduction, the level detection, phase detection, and synchronous detection in low frequency are made possible. Further, the level detection, phase detection, and synchronous detection are carried out after once demodulating the low-band converted chrominance signal into two color difference signals in the base band to thereby use a part of circuit in common and improve performance. Furthermore, by performing digital sampling demodulation for demodulating the low-band inverted burst into the base band by means of an AID converter and digital circuits, integration of digital LSis, combined used of detection circuits, detection circuits and a part of frequency conversion circuits, realization of any non-linear characteristics and reduction of external parts such as analog filters become possible of the chrominance signal processing apparatus. Accordingly, a small and inexpensive chrominance signal processing apparatus of low consumption power is realized.
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2.发明公开Recording and reproducing apparatus for recording and reproducing a carrier chrominance signal 失效用于记录和再现载体色度信号的记录和再现装置
公开(公告)号：EP0133047A3
公开(公告)日：1987-05-06
申请号：EP84305184
申请日：1984-07-30
IPC分类号： H04N09/79
CPC分类号： H04N9/7936
摘要： @ A recording and reproducing apparatus for recording a carrier chrominance signal, comprises a separating circuit (13) for separating a carrier chrominance signal from a color video signal, a recording signal processing circuit for converting the carrier chrominance signal into a carrier chrominance signal having a signal format suited for recording and reproduction (16), a recording circuit (17) for recording an output signal of the recording signal processing circuit on a recording medium (19a), a reproducing circuit (21) for reproducing the recorded signal from the recording medium (196), a reproduced signal processing (25) circuit for converting the reproduced signal from the reproducing circuit into a reproduced carrier chrominance signal having an original signal format, and a de-emphasis circuit (26) responsive to the reproduced carrier chrominance signal from the reproduced signal processing circuit, for subjecting the reproduced carrier chrominance signal to a de-emphasis so that a high-frequency component in a vertical spatial frequency of the reproduced carrier chrominance signal is relatively attenuated compared to a low-frequency component of the reproduced carrier chrominance signal.
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公开(公告)号：EP0122096A3
公开(公告)日：1986-11-26
申请号：EP84302205
申请日：1984-03-30
申请人： AMPEX CORPORATION
发明人： Trytko, David E , Wagner, Steven D.
IPC分类号： H04N09/535 , H04N09/79 , H03H07/00
摘要： An all-pass filter provides inversion of a chrominance component in a composite signal without separating the chrominance component from the composite signal, to provide for example, synthesizing composite video from a previous line of video. The filter includes an input (26') for receiving the composite signal along a subsequent signal path, and the application of selected, preferably symmetrical weighting factors to selected locations along the signal path. The path includes selected delay means (58-64) coupled to define a filter output via summing means (66). The latter provides the composite signal with inverted chrominance without an objectionable change in the relative phase and amplitude of the luminance components relative to the inverted chrominance.
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公开(公告)号：EP0153027A3
公开(公告)日：1987-05-20
申请号：EP85300473
申请日：1985-01-24
IPC分类号： H04N09/79
CPC分类号： H04N9/82
摘要： A color video signal recording system comprises means (5, 6) for producing a quadrature two-phase balance-modulated color signal by subjecting a subcarrier to quadrature two-phase balanced modulation by two color signals, means (10) for producing a demodulation-purpose reference phase signal which has the same frequency as that of the subcarrier and which is to be frequency-interleaved with said quadrature two-phase balance-modulated color signal, means for multiplexing said quadrature two-phase balance-modulated color signal and said demodulation-purpose reference phase signal together with a carrier luminance signal, and means (14) for recording said multiplex signal. The system minimizes deviation of hues from the original as well as that of color saturation from the original and eliminates drop-out or missing of color information, thereby ensuring a high quality of reproduced pictures.
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公开(公告)号：EP0178938A3
公开(公告)日：1986-07-16
申请号：EP85307514
申请日：1985-10-17
发明人： Glenn, William E.
IPC分类号： H04N05/225 , H04N09/09 , H04N05/76 , H04N09/79 , H03H15/00
CPC分类号： H04N7/012 , F02B2075/027 , H04N5/772 , H04N5/9205 , H04N7/01 , H04N7/015 , H04N9/045 , H04N9/797 , H04N9/86 , H04N9/87
摘要： An apparatus and method for generating video signals, including a high-definition component that has a reduced bandwidth, are disclosed. One form of video apparatus for generating video signals representative of images of a scene, comprises: first video imaging means (140; 521) and second video imaging means (130; 522, 523, 524); optical means (111; 512, 513, 516, 517) for directing light from the scene to the first and second video imaging means; means for scanning the first video imaging means (140; 521) at a relatively fast scan rate; and means for scanning the second video imaging means (130; 522, 523, 524) at a relatively slow scan rate. The first video imaging means may be a high-definition monochrome television camera and the second video imaging means a standard-resolution colour television camera. Alternatively, CCD camera chips (521, 522, 523, 524) may be used. One embodiment uses an optical switching system which makes efficient use of available light from a scene being imaged. Video recording techniques which save bandwidth, and a temporal filter which is tailored to the eye's temporal response are also disclosed.
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