Autocorrelation function factor generating method and circuitry

Details Autocorrelation function factor generating method and circuitry Autocorrelation function factor generating method and circuitry

1976-08-04

1978-01-31

Gruber, Felix D.

Boots, shoes, and leggings

179 1SB, 364604, G06F 1534

Patent

active

040719030

ABSTRACT:
For a delta modulated signal wave comprising a digital carrier wave modulated by an analog wave and represented accordingly as a bivalued digital data bit stream, a correlation function factor is generated by delaying the bit stream in time by an integral multiple of bits and accumulating the successive individual products over a predetermined number of bits of successive individual bits delayed in time and the corresponding currently appearing bits. The circuitry is extremely simple; readily procurable components only are required. A dual input exclusive OR (XOR) gating circuit is connected to the source of delta modulated signal bit stream and to an N-bit digital binary shift register also connected to the source. A stream of successive bivalued products of the current bits and the time delayed bits over a period of N-bits is obtained from the XOR gating circuit and applied to a bidirectional digital counting circuit from which an autocorrelation function factor is delivered.

REFERENCES:
patent: 3249911 (1966-05-01), Gustafsson
patent: 3660647 (1972-02-01), Pryor
patent: 3694643 (1972-09-01), Smith
patent: 3701894 (1972-10-01), Low etal.
patent: 3777133 (1973-12-01), Beck et al.
patent: 3792245 (1974-02-01), Hocker et al.
patent: 3925650 (1975-12-01), Brown
Rosenbloom: Using Time-Compression Techniques in Digital Correlation, Electronics vol. 34-1961, p. 191/193, Mar. 10, 1961.
Stone et al.: Digital Correlator Detects Voice Fundamental, Electronics Nov. 22, 1963, p. 28/30.
Gatland et al.: A Correlation Function Computer Using Delta Modulation Techniques, J. of Scientific Instr., 1965, vol. 42, p. 529/532.

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