Method and circuit for telephone dialing signal generation

Details Method and circuit for telephone dialing signal generation Method and circuit for telephone dialing signal generation

1984-04-10

1986-01-07

Dwyer, James L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328 27, 307261, 364721, H04M 126

Patent

active

045635480

ABSTRACT:
A method for approximating signals having sinusoidal waveforms with signals having trapezoidal waveforms, and a circuit for generating digital dual-tone multi-frequency (DTMF) dialing signals. The trapezoidal waveforms have sloped portions each equal in duration to one third of a period, and flat portions each equal in duration to one sixth of the period. DTMF dialing signals are generated by forming two such trapezoidal waveforms. The circuit forms trapezoidal waveforms by a computational technique. A periodic triangular waveform is first formed by repetitiously adding and subtracting an incremental value at a succession of time intervals. Then, the peaks of the triangular waveform are truncated to form the trapezoidal waveform.

REFERENCES:
patent: 4061886 (1977-12-01), Callahan, Jr. et al.

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