Color television signal decoding circuit

Details Color television signal decoding circuit Color television signal decoding circuit

1989-01-24

1990-01-30

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 23, H04N 504, H04N 944, H04N 966

Patent

active

048977136

ABSTRACT:
In a color television signal decoding circuit having a first phase-locked loop comprising a color synchronizing signal phase detection circuit (9) for a first digital oscillator (15) which supplies reference signals for demodulating a digital chrominance signal, and a second phase-locked loop comprising a line synchronizing signal phase detection circuit (65) for a second digital oscillator (29) which supplies a clock signal having a frequency coupled to the line frequency for an analog-to-digital converter (3) and for the first digital oscillator (15), the first phase-locked loop and a coupling (73, 45, 37) between the two loops is interrupted (41) when a stable synchronization state of the second phase-locked loop is detected (85), while a new phase-locked loop for the second digital oscillator (29) is formed which is then controlled (59, 67, 121, 71) by the color synchronizing signal phase detection circuit (9) so that further signal operations of the decoded signals can be performed with greater accuracy.

REFERENCES:
patent: 4625232 (1986-11-01), Nillesen
patent: 4626914 (1986-12-01), Breimer
patent: 4689664 (1987-08-01), Moring

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