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    • 5. 发明专利
    • CROSS COLOR REDUCING DEVICE FOR CARRIER CHROMINANCE SIGNAL
    • JPH06105322A
    • 1994-04-15
    • JP25283292
    • 1992-09-22
    • MITSUBISHI ELECTRIC CORP
    • KUMANO MAKOTOKOJIMA MASANORI
    • H04N9/64H04N9/78
    • PURPOSE:To reduce a scale and cost by detecting the degree of a non-inverse phase between the output of a delay device provided with specific delay time and an input carrier chrominance signal and reducing an output level corresponding to the degree. CONSTITUTION:The delay time of a field memory 2 for outputting an input carrier chrominance signal 1 containing a cross color while delaying it by one field is defined as 263 horizontal scanning period +N/fsc. In this case, N is an integer, fsc is a carrier color frequency and 263 shows a line number. A detector 3 inputs the input carrier signal and the output of the memory 2 and detects the degree of the non-inverse phase between both of signals. When the amplitude of x+y is larger than each component amplitude of (x) or (y) according to the input/output characteristic of the memory 2, a controller 4 decreases an output signal. Therefore, the cross color can be decreased, further, the output level is decreased, and the device can be constituted with the small scale at low cost. In this case, the x axis stands for the input signal level value of the delay device 2, and the y axis stands for the output level of the detector 3.
    • 9. 发明专利
    • SYNCHRONIZING SIGNAL REPRODUCING DEVICE FOR TELEVISION SIGNAL
    • JPH04117773A
    • 1992-04-17
    • JP23770990
    • 1990-09-06
    • MITSUBISHI ELECTRIC CORP
    • MORIKAWA YASUHIROKUMANO MAKOTO
    • H04N5/06H04N5/08
    • PURPOSE:To eliminate jitter component by counting a period of an inputted synchronizing signal with a sampling pulse, discriminating whether or not the period of a succeeding synchronizing signal is a regular period based on the count and generating a synchronizing signal based on a pulse signal generated when the count reaches a regular count in the case of the regular period. CONSTITUTION:A sampling device 1 outputs a horizontal synchronizing signal (c) resulting sampling an inputted horizontal synchronizing signal (b) and a differentiating device 2 outputs a differentiating signal (d) of the horizontal synchronizing signal (c). A phase comparator 3 compares a phase of the differentiating signal (d) with a phase of an output signal from a numeral discriminator 6 to output a control signal (g). A switch 7 is controlled by the control signal (g) to select an output pulse (h) of a numeral converter 5 for a period of an H level and a horizontal synchronizing signal generating circuit 9 outputs a horizontal synchronizing signal (k) with a prescribed width synchronously with a starting of an output signal (i) from the switch 7. Thus, even when a change point of the input horizontal synchronizing signal and a change point of a sampling pulse are close to each other, a synchronizing signal whose horizontal synchronizing signal does not include a jitter component is reproduced without provision of a phase adjustment circuit.