Programmable frequency and signalling format tone frequency enco

Details Programmable frequency and signalling format tone frequency enco Programmable frequency and signalling format tone frequency enco

1980-05-09

1982-03-16

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

179 2DP, 328 25, 329126, 331 1A, 331 76, 34082571, 375 65, 375 89, H03C 302, H04L 2710, H03D 306

Patent

active

043205224

ABSTRACT:
A programmable frequency and signalling format encoder/decoder circuit is disclosed which can be used alone or with other like encoder/decoder circuits and external timing and memory circuits to create a tone frequency transmission and reception system having particular frequency and signal format requirements. The encoder provides a sine wave output signal of a selected frequency by constructing the sine wave shape from a predetermined number of sine wave weighted discrete signal segments for each output signal cycle. The width of the segments within a given output signal cycle is determined by programming the encoder with data representative of the selected frequency. To ensure accurate conformance of the frequency of the output signal with a selected frequency, the encoder further includes circuitry for varying the width of individual segments within a single output signal cycle in accordance with the selected frequency. A programmable timing circuit particularly suited for controlling operation of one or more encoder/decoder circuits is also disclosed.

REFERENCES:
patent: 3497625 (1970-02-01), Hileman et al.
patent: 3937882 (1976-02-01), Bingham
patent: 4069392 (1978-01-01), Goldenberg et al.
patent: 4220823 (1980-09-01), Littlefield
patent: 4236248 (1980-11-01), Teramura et al.

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