Pulse or digital communications – Repeaters – Testing
Patent
1983-03-03
1984-10-30
Yusko, Donald J.
Pulse or digital communications
Repeaters
Testing
328151, H03K 1322, H04L 2702
Patent
active
RE0317209
ABSTRACT:
In an electrical system of the type in which a digitally-encoded signal is determined at least in part by the difference between a present value of an input signal and a reconstructed signal representative of a past value of the input signal and including a filter for extracting from the digital signal information relating to the time derivative of the input signal, peak detection means for determining the peak value of the output of said filter, and a signal generating means responsive to a reference signal determined from the output of said peak detection means for generating the reconstructed signal, improved circuitry for generating the reference signal. The circuit comprises weighting means for increasing the magnitude of the input to the filter as a function of the preponderance of one or the other state in said digitally-encoded signal.
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patent: 4190801 (1980-02-01), DeFreitas
Motorola Semiconductors XC3417, XC3418, 1977 publication, Product Preview, "Continuously Variable Slope Modulator/Demodulator".
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Jayant, Nuggehally S., "Digital Coding of Speech Waveforms: PCM, DPCM, and DM Quantizers", Proceedings of the IEEE, vol. 62, No. 5, May 1974, pp. 611-632.
Chakravarthy, C. V. and Faruqui, M. N., "Two Loop Adaptive Delta Modulation Systems", IEEE Transactions on Communications, Oct. 1974, pp. 1710-1713.
Blake John J.
DeFreitas Richard E.
DeltaLab Research, Inc.
Yusko Donald J.
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