VTR signal processing circuit
A signal processing and video recorder technology, applied in the field of VTR signal processing circuit, can solve the problems of reduced image quality, reduced adjacent track elimination effect, expensive glass delay line, etc.
Inactive Publication Date: 2009-08-05
VICTOR CO OF JAPAN LTD
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Problems solved by technology
[0009] When the delay element is one that uses a glass delay line, there is a problem: the glass delay line itself is a rather large device mounted on a circuit board and it is expensive
With this phase change, the elimination effect of the cross-color of adjacent tracks is reduced, causing a reduction in image quality, and when the phase is reversed, the eliminated signal component results in a colorless image
Method used
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no. 1 example
[0034] Such as figure 1 As shown, a circuit block constituting a VTR signal processing circuit is formed together with other circuit blocks on a single semiconductor substrate such as single crystal silicon by a known semiconductor integrated circuit (IC) manufacturing technique. Although not intended to be limiting, the present embodiment is directed to a VTR for a VHS system using a chromatic secondary wave frequency of 3.58 MHz.
[0035] exist figure 1Among them, the color video signal converted into a 40fh low-band signal is separated from the reproduced signal by a low-pass filter not shown in the figure, and input. In the case of the NTSC system, a delay circuit constituted by a CCD (Charge Coupled Device) 3 delays this color video signal by one horizontal period. An input section for performing analog-to-digital conversion is also available. A shift register for delaying digital signals and a digital-to-analog (D / A) conversion circuit for restoring shifted digital ...
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In the VTR signal processing circuit, the first reproduced color video signal and the second color video signal obtained by delaying one or two horizontal periods synchronized with the preset clock signal are sent to the first and second frequency converter circuits respectively , a frequency signal having 2n times the carrier frequency used in frequency conversion that converts a reproduced color video signal into a standard color signal is generated by an oscillator circuit. This oscillation frequency is frequency-divided so that the above-mentioned carrier frequency produces carrier frequencies with phases of 0°, 90°, 180° and 270° respectively, and these four kinds of carriers are selectively output and sent to The first and second frequency converter circuits, so that the output signal of the first frequency converter circuit and the output signal of the second frequency converter circuit become in-phase or anti-phase, and the two output signals are added or one output signal is subtracted from the other The output signal eliminates cross-color between adjacent tracks.
Description
[0001] The application of the present invention is a divisional application of the patent application with the same name whose filing date is March 10, 1998 and whose application number is 200410004090.8. technical field [0002] The present invention relates to a VTR (Video Tape Recorder) signal processing circuit, and more particularly to a technique effectively used in a device including a frequency converter section of a dual main converter system by utilizing two frequency converter circuits And a delay circuit such as a CCD (Charge Coupled Device) eliminates cross-color contained in a reproduced color video signal (reproduced color under signal). Background technique [0003] Figure 5 is a block diagram of the frequency converter portion of a conventional double converter system of the prior art. [0004] Fig. 6(a) is a waveform diagram of a conventional delay operation of a color video signal of the prior art when operating stably. [0005] FIG. 6(b) is a waveform d...
Claims
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IPC IPC(8): H04N9/793H04N9/84G11B5/027G11B20/02H03D7/16H04N9/79H04N9/83
CPCH04N9/7917H04N9/83H04N9/84H04N9/793
Inventor 栗原隆市川嘉久新井泉仓林直树仓本博室谷刚
Owner VICTOR CO OF JAPAN LTD