Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1975-02-07
1976-07-27
Griffin, Robert L.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 11D, H03K 1322
Patent
active
039719871
ABSTRACT:
In a delta modulator a sequence of code symbols are generated which are indicative of increments of signal level, with each code symbol being determined in accordance with the difference in signal level between an input signal and a prediction signal which is a representation of the input signal. A sequence of the generated code symbols are stored, including the most recent code symbol and a preceding number of code symbols, with the pattern of code symbols at any instant defining a state of signal activity. There is a table of delta increments, a table of threshold values, and a digital gain logic network, all of which provide signal outputs which are controlled by the state of signal activity represented by the stored code signal pattern. The signal output from the delta table and the threshold table are modified an amount determined by the value of the signal output from the digital gain logic network. An accumulation of modified delta increments are summed with modified threshold values for providing the prediction signal. The prediction signal and the input signal are compared for generating a new code symbol.
REFERENCES:
patent: 3393364 (1968-07-01), Fine
patent: 3609552 (1971-09-01), Limb et al.
patent: 3628148 (1971-12-01), Brolin
patent: 3699566 (1972-10-01), Schindler
patent: 3815033 (1974-06-01), Tewksbury
patent: 3878465 (1975-04-01), Stephenne et al.
patent: 3916314 (1975-10-01), Franaszek et al.
IBM Technical Disclosure Bulletin vol. 15, No. 10 Mar. 1973, pp. 3168-3169 "Adaptive Delta Modulator With Variable--Sample Rate"--C. K. Jones, L. E. West.
Carrubba Francis P.
Franaszek Peter A.
Grossman David D.
Arnold Jack M.
Bookbinder Marc E.
Griffin Robert L.
International Business Machines - Corporation
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