H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/16, 330/34
H04M 3/02 (2006.01) H03B 28/00 (2006.01) H03F 3/217 (2006.01) H03K 4/06 (2006.01) H03K 5/08 (2006.01) H03K 17/66 (2006.01) H04M 19/02 (2006.01)
Patent
CA 1202741
- 31 - RINGING SIGNAL GENERATOR EMPLOYING DELTA MODULATION POWER AMPLIFICATION TECHNIQUES Abstract A ringing signal generator is disclosed in which a low-level reference ringing signal, generated by a reference waveform generator is amplified by a delta- modulation power amplifier. 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 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 the reference ringing signai (Ei) with an analog feedback signal (Ef) reconstructed from the high-level digital signal. The resultant binary error signal (E?) , representing the polarity of the difference between the reference and the feedback signals, is applied to a logic circuit 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 in a bridge switch to generate the high-level digital signal.
453130
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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