Method of and device for tuning a resonant circuit coupled to a

Details Method of and device for tuning a resonant circuit coupled to a Method of and device for tuning a resonant circuit coupled to a

1988-09-07

1990-05-08

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

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3581911, 455186, H04N 544

Patent

active

049243004

ABSTRACT:
Automatic adjusting device: an oscillator followed by an inverter feeds the resonant circuit, which is followed by a frequency discriminator. The circuit is, for example, the "cloche" circuit of a SECAM decoder unit. The discriminator then forms part of the television set. A synchronizing source applies line and field synchronizing signals and a color identification signal to a synchronizing signal and window generator. The latter applies to the inverter a signal which triggers the inversion of the signal coming from the oscillator, which produces a 180.degree. phase jump. It also applies to a measuring and processing circuit a time window which is used during the measurement at the output of the discriminator of the transient signal produced by the phase jump. The result of the measuring operation is applied to an element which acts on the adjustment of the resonant circuit.

REFERENCES:
patent: 4287530 (1981-09-01), Gay et al.
patent: 4338580 (1982-07-01), Gay
patent: 4359694 (1982-11-01), Suenaga
patent: 4438451 (1984-03-01), Hinn et al.
patent: 4511923 (1985-04-01), Gotz
patent: 4603302 (1986-07-01), Lawton
patent: 4685150 (1987-08-01), Maier
patent: 4760535 (1988-07-01), Englmeier

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