Sony Corporation

Shoji Ohmori

Takashi Okada

Hiroyuki Kobayashi

Yutaka Tanaka

Takao Mogi

Atsushi Matsuzaki

Kiyonori Tominaga

This invention relates to an apparatus for descrambling scrambled television signals including a scrambled video signal having a first scrambling pattern, a scrambled control signal having a second scrambling pattern, and descrambling signals.

Apparatus for descrambling transmitted scrambled television signals

A color television receiver includes an automatic phase control circuit (which will be hereinafter referred to simply as an APC circuit) with a voltage controlled oscillator for controlling the phase of a reference carrier supplied to a color demodulator so that the phase and frequency of the reference carrier are locked to those of a color burst signal. In addition to the APC circuit, an auxiliary frequency control loop drives the frequency of the voltage controlled oscillator until its frequency falls within the lock-in range of the APC loop. The auxiliary frequency control loop includes a counter circuit for counting cycles of the output signal of the voltage controlled oscillator during a reference time interval and a decoding circuit for decoding the output of the counter circuit to produce an auxiliary control signal for frequency control of the voltage controlled oscillator.

Color television receiver AFPC circuit

Growing community of inventors

Tachikawa, Japan

Shoji Ohmori