US 5,402,243 A · Regenerating circuit of synchronizing signals for standard video signals

Abstract

A synchronizing signal regenerating circuit for standard video signals in a digital video signal processing system includes a circuit for regenerating stable horizontal synchronizing signals, a circuit for generating double horizontal synchronizing signals, a circuit for generating horizontal synchronizing signals, a circuit for generating vertical synchronizing signals and an output circuit. The circuit for regenerating stable horizontal synchronizing signals regenerates the horizontal synchronizing signals in response to quadruple burst signals, and the circuit for generating double horizontal synchronizing signals is connected to the output terminal of the circuit for regenerating stable horizontal synchronizing signals. The circuit for generating horizontal synchronizing signals is connected to an output terminal of the circuit for regenerating stable horizontal synchronizing signals. The circuit for generating vertical synchronizing signals generates those signals from the input vertical synchronizing signals. The synchronizing signal generating circuit of the present invention can be incorporated into digital video signal processing systems, making it possible to eliminate a sample ratio converting circuit. As a result, the total system for video signal processing can be miniaturized and, thus, constructed in a light weight and compact form.

Claims12

Dependent claims

A regenerating circuit of synchronizing signals for a digital video signal processing system including a Y/C separating device wherein burst-locked signals serve as reference signals, and a Y/C processing device and a Y/C interpolating device wherein line-locked signals serve as reference signals, comprising:

stable horizontal synchronizing signal regenerating means for regenerating stable horizontal synchronizing signals from input horizontal synchronizing signals (fH), input vertical synchronizing signals (fv) and input quadruple burst signals (4 fsc);
means connected to said stable horizontal synchronizing signal regenerating means for generating double horizontal synchronizing signals according to the input quadruple burst signals (4 fsc);
means connected to said stable horizontal signal regenerating means for generating horizontal synchronizing signals according to the input quadruple burst signals (4 fsc);
means for generating second vertical synchronizing signals according to the input vertical synchronizing signals;
and
means for commonly providing line-locked and burst-locked horizontal synchronizing, vertical synchronizing signals and double horizontal synchronizing signals in synchronization with the input horizontal synchronizing signals, said second vertical synchronizing signals and said double horizontal synchronizing signals.

3 more elements

first means for regenerating stable horizontal synchronizing signals from input horizontal synchronizing signals, input vertical synchronizing signals and input quadruple burst signals;
second means connected to said first means for receiving said stable horizontal synchronizing signals for generating double horizontal synchronizing signals based on said input horizontal synchronizing signals;
third means connected to said first means for generating horizontal synchronizing signals based on said input horizontal synchronizing signals;
fourth means for generating vertical synchronizing signals based on said input vertical synchronizing signals;
and
fifth means for aligning respective phases of said horizontal synchronizing signals, said vertical synchronizing signals and said double horizontal synchronizing signals.

3 more elements

Dependencies are inferred from the claim text.

Regenerating circuit of synchronizing signals for standard video signals

Life of this patent

Regenerating circuit of synchronizing signals for standard video signals

Life of this patent

Abstract

Claims12