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US 3,968,354 AGranted
Transversal digital filter for delta coded signals
AssigneeT.R.T. Telecommunications Radioelectriques
InventorGilbert Marie Marcel Ferrieu
Life of this patent
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Abstract
A transversal digital filter including a shift register provided with a number of stages to which level control devices are connected by means of taps, the level control devices being connected to a feedback circuit which is connected through a combination device to the input of the shift register, a delta modulator being incorporated between the combination device and the input of the shift register, and a feedback circuit associated with the delta modulator forming part of the filter.
Claims8
A digital filter comprising
- clock pulse generator means for generating clock pulses;
- input means for receiving an input signal to be processed;
- delta modulator means responsive to said clock pulses for modulating the output of said input means, and having an output;
- delay means connected to the output of said delta modulator means, comprising a plurality of stages, at least some of said stages having a tap;
- and decoder means connected to said taps for supplying an output signal of predetermined magnitude, and a feedback signal to said input means.
2 more elements
A digital filter comprising
- an input line for receiving an input signal to be processed;
- delay means, having an input, and comprising a plurality of stages, at least some of said stages having a tap;
- decoder means connected to said taps for supplying an output signal of predetermined magnitude, and a feedback signal;
- input means for combining said input signal and said feedback signal to produce a combined signal;
- and
- comparator means for comparing said combined signal to a local expansion signal to produce a resulting signal applied to the input of said delay means.
3 more elements
A digital filter comprising
- input means for receiving an input signal to be processed;
- a shift register connected to said input means, said shift register having a plurality of stages, at least some of said stages having a tap;
- a feedback circuit connected to said taps and comprising expander means including an integrator having an adjustable time constant.
Dependencies are inferred from the claim text.