Chrominance subcarrier generating circuit

Details Chrominance subcarrier generating circuit Chrominance subcarrier generating circuit

1990-03-14

1992-05-05

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 23, 358 25, H04N 964

Patent

active

051112825

ABSTRACT:
A chrominance subcarrier generating circuit for adjusting output levels of a plurality of chrominance subcarriers having different phases to the optimum level is disclosed. A filter removes harmonic components from the square signals to extract only the sinusolidal subcarriers, a first terminal provides first chrominance subcarriers after blocking DC components, a phase-shifter shifts the phases of the chrominance subcarriers, another terminal provides second chrominance subcarriers after blocking the DC components, and a power source filter and an auxiliary power source filter for preventing the first and second chrominance subcarriers from influencing other power sources and for blocking the noise coming from other power sources. Levels of the first and second chrominance subcarriers can be set properly regardless of the characteristics of the transistors.

REFERENCES:
patent: 4084177 (1978-04-01), Aschwanden
patent: 4278994 (1981-07-01), Van der Valk
patent: 4366451 (1982-12-01), Kowal
patent: 4405937 (1983-09-01), Kudo

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