SIF signal processing circuit

Details SIF signal processing circuit SIF signal processing circuit

1996-12-17

1999-11-30

Kostak, Victor R.

Television

Receiver circuitry

Demodulator

348738, 348555, 348736, 4551803, H04N 5455, H04N 546

Patent

active

059951699

ABSTRACT:
In an SIF signal processing circuit, an SIF signal, which is an FM signal having a carrier frequency equal to a frequency difference between a video IF carrier and a sound IF carrier, is first converted to a lower carrier frequency common to SIF signals of any broadcasting system, and is then demodulated. The SIF processing circuit is provided with a PLL circuit for converting an SIF signal down to a lower frequency, so that an output from the PLL circuit is mixed with the SIF signal. The output of the PLL circuit is varied in accordance with a broadcasting system. A plurality of frequencies can be easily obtained from the PLL circuit simply by controlling a frequency division factor of its frequency divider. Thus, resonators can be dispensed with except for one for generating a reference oscillation signal.

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Hoke, et al, Sound Carrier Separation Systems, Television Engineering Handbook, 13.118-13.123, 1986.

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