Transmitted television signal waveform equalizing system

Details Transmitted television signal waveform equalizing system Transmitted television signal waveform equalizing system

1993-05-11

1994-10-04

Groody, James J.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348614, H04N 5213

Patent

active

053530691

ABSTRACT:
A waveform equalizing system includes a clock reproducing phase locked loop circuit for reproducing a clock signal from a television signal; a transversal filter; a first selector circuit for alternatively passing the television signal or an output of a first memory to the transversal filter; a CPU for extracting reference signals contained in the television signal from the input and output of the transversal filter through two second memories respectively and for performing a synchronous addition of the same; the first memory for storing a reference signal processed by the synchronous addition; and a second selector circuit for alternatively delivering the television signal or an output of the transversal filter in response to a control signal from the CPU. The CPU is arranged for calculating a phase difference between the clock signal of the clock reproducing circuit and its ideal form from the reference signal processed by the synchronous addition and controlling a clock signal phase of the clock reproducing phase locked loop circuit to correct the phase difference.

REFERENCES:
patent: 4691226 (1987-09-01), Freyberger
patent: 4896213 (1990-01-01), Kobo et al.
patent: 5099328 (1992-03-01), Kobo et al.

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