Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1982-08-23
1984-07-17
Pellinen, A. D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307356, H04M 150
Patent
active
044608080
ABSTRACT:
A tone receiver suitable for use in a telephone system and which adaptively narrows its amplitude sensitivity range defining valid tone signals on a per call basis in accordance with the amplitude of a first tone signal received on a call. The signal range adaptability improves signal echo rejection and spurious noise talkoff. A preferred embodiment is implemented by a programmed digital signal processor which increases the lower amplitude signal threshold in accordance with the amplitude of the first signal. An alternative embodiment adaptively attenuates the level of incoming signals before signal validation. A further improvement of both embodiments allows further amplitude range narrowing in response to any subsequent signal on a call which has an amplitude greater than that of any preceding signal in the call.
REFERENCES:
patent: 3076059 (1963-01-01), Meacham et al.
patent: 3143602 (1964-08-01), Morrison et al.
patent: 4162377 (1979-07-01), Mearns
patent: 4191860 (1980-03-01), Weber
patent: 4227055 (1980-10-01), Hanson
patent: 4318128 (1982-03-01), Sauvanet
patent: 4385208 (1983-05-01), Tow
Bell System Technical Journal, vol. 39, No. 1, Jan. 1960, "Pushbutton Calling with a Two-Group Voice Frequency Code", pp. 235-255, L. Schenker.
Bell Laboratories Record, Jan. 1982, "Silencing Echoes on Satellite Circuits", pp. 3-6, L. E. Ashkenazi, T. H. Curtis, S. J. D'Ambra, R. H. Tegethoff.
Bell System Technical Journal, vol. 60, No. 7, Part 2, Sep. 1981, "Architecture and Performance", pp. 1449-1462, J. R. Boddie, G. T. Daryanani, I. I. Eldumiati, R. N. Gadenz, J. S. Thompson, S. M. Walters.
Bell System Technical Journal, vol. 60, No. 7, Part 2, Sep. 1981, "Receiver for Touch-Tone.RTM. Service", pp. 1573-1583, J. R. Boddie, N. Sachs, J. Tow.
Battista Ralph N.
Groves Quentin D.
Tow Jimmy
AT&T Bell Laboratories
Dwyer James L.
Herndon J. W.
Pellinen A. D.
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