DC REPRODUCTION CIRCUIT AND SYNCHRONIZING SEPARATOR CIRCUIT AND TELEVISION RECEIVER USING EITHER OF THEM

摘要

PURPOSE:To reduce the response time and to prevent malfunction by detecting a peak value of a synchronizing signal in a composite video signal with a DC bias applied thereto and controlling the applied DC bias in response to the result of comparison between the peak value and a preset object value. CONSTITUTION:A peak value detection means 4 detects a peak value of a synchronizing signal in a composite video signal. The fluctuation of the valve means that the DC level of the composite video signal is fluctuated. Then the peak value is compared with an object value at a comparator means, the DC level fluctuation is detected and the DC bias applied to the composite video signal is controlled in response to the result by a DC bias control means 3 to apply DC reproduction of the composite video signal. Thus, the response time is reduced and malfunction is prevented.