Television receiver with automatic tuning control

Details Television receiver with automatic tuning control Television receiver with automatic tuning control

1992-05-05

1993-12-21

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358188, 3581951, 455257, 455265, H04N 544, H04N 550

Patent

active

052725340

ABSTRACT:
TV receiver including an RF section, a mixer stage to which a tuning frequency is applied from a tuning oscillator, an IF section, a synchronous detection device and a frequency and phase-locked loop circuit having a PLL and a FLL, the IF section being coupled to a phase detector of the PLL and to a frequency detection device of the FLL, the phase detector and frequency detection device being commonly coupled to a loop branch having the two loops in common and incorporating a loop filter and a controllable oscillator, the controllable oscillator applying a local in-phase carrier to the synchronous detection device and a local phase quadrature carrier to the phase detector. To improve the tuning behavior, an output of the loop filter is coupled to a circuit for generating a tuning control signal, this circuit including a comparison circuit for deriving a tuning control signal for the tuning oscillator from the difference between the value of the control signal of the controllable oscillator and a reference value, the controllable oscillator supplying an oscillator frequency which is equal to the intermediate frequency in the case of a control signal of the reference value.

REFERENCES:
patent: 4253118 (1981-02-01), Flaza
patent: 4261016 (1981-04-01), Hongu et al.
patent: 4524389 (1985-06-01), Isobo et al.
patent: 4823399 (1989-04-01), George
patent: 4890071 (1989-12-01), Curtis
patent: 4929905 (1990-05-01), Ruitenburg

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