Digital agc arrangement

Details Digital agc arrangement Digital agc arrangement

H - Electricity

04

N

350/90

H04N 5/04 (2006.01) H03G 3/20 (2006.01)

Patent

CA 1195770

ABSTRACT OF THE DISCLOSURE An analog carrier signal and its sidebands contain modulated information which is to be digitally encoded and processed. Demodulation and digital encoding is accomplished in a single process by an analog-to-digital converter, which samples the analog signals in response to a sampling signal of a frequency which is less than twice the frequency of the highest frequency in the carrier and sidebands, but is at least twice the bandwidth of the band of frequencies containing the carrier signal and its information-bearing sidebands. The analog signal samples are digitally encoded, producing digital information signals corresponding to baseband signal components. When used in a television receiver to produce digital signal samples, the band of analog signals may include both sound and picture carriers and their audio and video information. By controlling the phase and frequency of the analog carrier signal in relation to the color subcarrier signal, and deriving the sampling signal from the analog carrier, an ease in video signal demodulation is provided.

421562

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