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Reproducing circuit of secam chrominance signal

阅读:126发布:2021-07-27

专利汇可以提供Reproducing circuit of secam chrominance signal专利检索,专利查询,专利分析的服务。并且PURPOSE:To compensate the temperature characteristics of demodulated outputs of R-Y and B-Y and to obtain an SECAM demodulating signal stable for the temperature by setting up the temperature characteristics of a DC bias between the outputs of the R-Y and B-Y modulators reversely each other. CONSTITUTION:A video detection output signal is inputted to a bell filter 1, amplitude controlled by a limiter amplifier 2 and delayed by 1H delay line 3. The delayed signal is applied to an SECAM switch 6 and the output of the amplifier 2 is also applied directly to the switch 6. The R-Y demodulator 7 and the B-Y modulator 8 are directly connected to the trailing stage of the switch 6. Temperature compensating circuits 58, 59 are connected to the output side the demodulators 7, 8 respectively. The circuits 58, 59 invert the temperature characteristics of the DC biases of the outputs from the demodulators 7, 8 respectively and apply the temperature-compensated signals to deemphasizing circuits 9, 10 respectively. The applied signals are deemphasized by the circuits 9, 10 and blanked at a blanking period by vertical blanking circuits 60, 61 to obtain a fixed DC level. The outputs from the circuits 60, 61 are processed by color controllers 11, 12.,下面是Reproducing circuit of secam chrominance signal专利的具体信息内容。

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