Semiconductor delay line driven by an input signal-derived reference signal

DETAILED DESCRIPTION It is an object of the present invention to provide a method of driving a semiconductor delay line apparatus having a good delay characteristic without externally supplying a clock signal.
It is another object of the present invention to provide a semiconductor delay line apparatus allowing a good delay characteristic without externally supplying a clock signal.
According to an aspect of the present invention, there is provided a method of driving a semiconductor delay line comprising the steps of: inputting a television signal and deriving an intermittent reference signal from a color burst signal of the television signal; generating a continuous reference signal from the intermittent reference signal; and driving a CCD semiconductor delay line by using the continuous reference signal, and delaying the television signal.
A television signal contains a color burst signal having a frequency substantially the same as that of the subcarrier signal.
If an intermittent reference signal is extracted from the burst signal, the extracted intermittent reference signal has the same characteristic as the subcarrier signal.
If a continuous reference signal is generated from the intermittent reference signal extracted from the color burst signal, this continuous reference signal has the same characteristics as the continuous subcarrier signal.
Using this continuous reference signal, a CCD semiconductor delay line can be reliably driven.
It is therefore possible to drive a CCD semiconductor delay line by generating a continuous reference signal from the input signal itself, without externally supplying a reference signal.