Tone Burst Generator

Details Tone Burst Generator Tone Burst Generator

1993-02-04

1994-12-13

Chin, Stephen

Telephonic communications

With check operated control

Coin signalling or control

379153, 379154, 379155, 379132, H04N 1700, H04N 1500

Patent

active

053735528

ABSTRACT:
A tone burst generator where a continuous tone voltage is applied across two series-connected semiconductor switches each having an ON state and an OFF state. A first control circuit controls the state of the first switch and the variable impedance in an intermediate region between its ON and OFF states to cause gradual, well-defined OFF/ON and ON/OFF transitions of the first switch. As a result of these first switch transitions, a voltage tone burst is generated that has precisely defined edges to eliminate clicking noise. The continuous tone voltage is of only one polarity--it has a non-zero DC component and an AC component having a peak-to-peak variation less the twice the magnitude of the non-zero DC component. A second control circuit controls the state of the second switch and the variable impedance in an intermediate region between its ON and OFF states to cause well defined ON/OFF and OFF/ON transitions of the second switch.

REFERENCES:
patent: 2935567 (1960-05-01), Anderson
patent: 4719648 (1988-01-01), Boeckmann
patent: 4962520 (1990-10-01), Gozen
patent: 5168518 (1992-12-01), Crisenzo et al.
patent: 5272398 (1993-12-01), Schroder-Brunloop et al.
"Type TP2 . . . oscillator filter unit", Sodeco-Saia, Information E137a.
A. B. Grebene, Bipolar and MOS Analog Integrated Circuit Design, Chapter 9, pp. 451-479, 1984.
P. R. Gray et al., Analysis and Design of Analog Integrated Circuits, Second Edition, pp. 590-605, 1984.
The Radio Amateur's Handbook, 1978, pp. 352-354.

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