Ringing signal generator employing delta-modulation power amplif

Details Ringing signal generator employing delta-modulation power amplif Ringing signal generator employing delta-modulation power amplif

1983-05-20

1985-02-19

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

179 18HB, H03F 338

Patent

active

045008442

ABSTRACT:
A ringing signal generator is disclosed in which a low-level reference ringing signal, generated by a reference waveform generator (101), is amplified by a delta-modulation power amplifier (106, 108). The low-level reference signal is digitally encoded using delta-modulation techniques to generate a high-level digital signal. The high-level digital signal is filtered (421) to remove the high-frequency components therefrom and to decode the digital signal to form the high-level ringing signal that has the same shape and frequency as the reference signal. The delta-modulation power amplifier generates the ringing signal by comparing (401) the reference ringing signal (E.sub.i) with an analog feedback signal (E.sub.f) reconstructed from the high-level digital signal. The resultant binary error signal (E.sub..epsilon.), representing the polarity of the difference between the reference and the feedback signals, is applied to a logic circuit (405) which samples the error signal at a clock rate substantially higher than the frequency of the ringing signal, and generates two binary control signals (+SW, -SW) based upon the error signal at multiple clock instants. These control signals open and close the switching elements (411, 412, 413, 414) in a bridge switch (410) to generate the high-level digital signal.

REFERENCES:
patent: 3859597 (1975-01-01), Zwaal
patent: 4090136 (1978-05-01), Magnien et al.
patent: 4174467 (1979-11-01), Ferrieu
patent: 4220826 (1980-09-01), Kiss
patent: 4239935 (1980-12-01), Bosik et al.
patent: 4340785 (1982-07-01), Awadalla
patent: 4349703 (1982-09-01), Chea, Jr.

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