| 摘要 |
PURPOSE:To complete the ghost elimination with a transversal filter, by making the amplitudes of ghost fitted to black and white levels equal with each other. CONSTITUTION:An intermediate frequency amplifier circuit 10 generates a television intermediate frequency signal. A phase comparator 11 compares an output of a voltage controlled oscillator 13 with the said television intermediate frequency signal for the phase and generates an error voltage in response to the phase difference. The 1st LPF 12 is arranged between the output of the phase comparator 11 and the control terminal of the voltage controlled oscillator 13. A multiplier 15 multiplies the said television intermediate frequency signal with the output of the said voltage controlled oscillator. The 2nd low pass filter 16 is connected to the output of the multiplier 15 and the output of the filter 16 is applied to a transversal filter 17. |
