Television receiver

Details Television receiver Television receiver

1989-08-10

1992-08-11

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, H04N 504

Patent

active

051384515

ABSTRACT:
A sync generator which generates a reference horizontal synchronizing signal, a time difference detector which detects the time difference between the reference horizontal synchronizing signal and a horizontal synchronizing signal within a received television signal, and a variable delay circuit which responds to an output signal of the time difference detector to control the delay time and delay the received television signal are installed in a television receiver. When a plurality of horizontal synchronizing signals exist in one horizontal scanning period of the received television signal, the time difference between the horizontal synchronizing signal with the maximum amplitude and the reference horizontal synchronizing signal is detected, and the delay time of the received television signal is controlled in the variable delay circuit according to this time difference. As a result, the phase of the horizontal synchronizing signal with the maximum amplitude matches the phase of the reference horizontal synchronizing signal. Therefore, when changes in the receiving environment cause the signal strength of ghosts to become greater than that of an original signal and it becomes desirable to receive the ghost as a main signal in place of the original signal, it is possible to switch from reception of the original signal to reception of the ghost signal without resulting in distortion of synchronization.

REFERENCES:
patent: 4159481 (1979-06-01), Mikado

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