Pulse-spacing decoder

Details Pulse-spacing decoder Pulse-spacing decoder

1990-02-14

1992-03-03

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

342 46, 329313, H03K 908

Patent

active

050938444

ABSTRACT:
A circuit for filtering pulse sequences of a given frequency out of a composite signal includes a series combination of a monostable multivibrator (MF) and a random-access memory (RAM), an address register and a clock. The monostable multivibrator (MF) serves as a pulse shaper of incoming signals. The input (D.sub.E) and output (D.sub.A) of the random-access memory (RAM) are connected to the inputs of an AND gate (UG). An address counter register (AR) associated with the random-access memory (RAM) has a count cycle whose duration is equal to the pulse spacing of the sequence to be recognized. During each clock period (T2), the current signal state of the input (D.sub.E) of the random-access memory (RAM) and the content of the addressed memory cell are checked for equality by the AND gate (UG) and the current signal state is then written into the cell.

REFERENCES:
patent: 3984807 (1976-10-01), Haemmig
patent: 4027276 (1977-05-01), Shaughnessy
patent: 4242664 (1980-12-01), Lindstedt et al.
patent: 4430652 (1984-02-01), Rothenbuhler et al.
patent: 4627075 (1986-12-01), Fleming, III et al.
patent: 4768207 (1988-08-01), Sejourne et al.
Patent Abstract of Japan, vol. 5, No. 70, May 12, 1981, JP 5619226, Mitsubishi Denki K.K.
E. Kramer, "Funksysteme fur Ortung und Navigation" [Radio Position Finding and Navigation Systems] Published: Berliner Union GmbH, Stuttgart, 1973, pp. 147-159.

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