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US 4,538,236 AGranted
Adaptive digital signal coring circuit
AssigneeRCA Corporation
InventorsRobert A. Dischert, William H. Meise
Life of this patent
Estimating the term…
Abstract
A digital signal coring circuit removes from a stream of incoming digital data words low-valued variations lying between upper and lower threshold reference values. Upper and lower threshold values are adjusted in response to the value of the outgoing cored digital data words so that such low-valued variations are removed over the entire range of values of the digital data words, and not merely around a baseline value.
Claims12
Digital signal coring apparatus comprising:
- a source of digital input signals;
- a source of first and second digital signals having values which determine a range of digital values;
- modifying means coupled to said source of first and second digital signals and responsive to a cored output signal for generating third and fourth digital signals corresponding to time varying upper and lower boundary values of said range of values;
- comparison means coupled to outputs of said source of digital input signals and said modifying means, for producing signal sample values representing the degree to which the input digital signals depart from said range of digital values;
- and
- means coupled to said comparison means and responsive to said signal sample values for producing said cored output signal by summing successive signal sample values.
3 more elements
Apparatus for developing cored digital signals from input digital signals comprising:
- a source of input digital signals;
- a source of first and second digital reference signals;
- storing means having input and output ports, for storing digital signals;
- means coupled to said source of first and second digital reference signals and the output port of said storing means for combining digital signals stored in said storing means and said first and second digital reference signals to produce first and second digital threshold signals, respectively;
- comparison means, having respective inputs coupled to outputs of said means for combining and said source of input digital signals for producing further digital signals representing the values and senses by which said input digital signals depart from a range of values between said first and second digital threshold signal values;
- means coupled to said comparison means and to the output port of said storing means for summing said further digital signals and said stored digital signals;
- means for applying said summed digital signals to the input port of said storing means, and wherein the samples contrained in said storing means correspond to cored digital signals;
- and
- wherein said first and second digital threshold signal values tend to track the envelope of said input digital signals.
6 more elements
Dependencies are inferred from the claim text.