Method of digitization of intermediate frequency signals in part

Details Method of digitization of intermediate frequency signals in part Method of digitization of intermediate frequency signals in part

1996-05-14

1998-05-05

Burgess, Glenton B.

Television

Receiver circuitry

Demodulator

348639, 348554, 348731, H04N 544, H04N 546

Patent

active

057482624

ABSTRACT:
A method of digitization of an intermediate frequency signal having a bandwidth that can change from one standard to another and of which one of the frequency limits of this band is substantially constant, wherein before converting the analog signal into a digital signal, the signals of the channels (S.sub.if.sup.N+1, S.sub.if.sup.N-1) adjacent to the frequency band of the signal to be digitized are eliminated in three stages: in a first stage, the signals (S.sub.if.sup.N+1) of channels adjacent to said substantially constant frequency limit are eliminated by filtering; in a second stage, the signal to be processed is transposed in frequency so that in the transposed signal the variable frequency limit of said band of the signal to be digitized has a substantially constant value; in a third stage, the signals of channels adjacent to the transposed signal are eliminated by filtering. The invention is applicable to the processing of digital IF video signals.

REFERENCES:
patent: 4502078 (1985-02-01), Steckler et al.

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