Raymond S Medaugh

46548637, Mar 31, 1987

May 23, 1985

6/737330

William R. Belfield - Tinton Falls NJ
Raymond S. Medaugh - Middletown NJ

AT&T Bell Laboratories - Murray Hill NJ

H04B 1406

375 27

Superior performance, better tracking, and stability of an adaptive predictor are realized by employing a so-called high order (eighth) prediction filter and by updating the filter coefficients in accordance with an algorithm based on the sign of a reconstructed signal sample (s. sub. q (k)) multiplied by a quantized version (e. sub. q (k)) of a differential error signal normalized by an expected magnitude of the reconstructed signal sample.

59501545, Sep 7, 1999

Jul 15, 1996

8/680760

Raymond Stephen Medaugh - Wharton NJ
Ronald Shaya - Morristown NJ

AT&T Corp. - Middletown NJ

G10L 302
G10L 900

704226

A noise filter technique estimates noise in speech that has been processed by Call Multiplication Equipment. The received signal has speech frames and interspersed fill-noise frames inserted at a satellite signal receiving station. The filtering technique removes the fill-noise from the signal. The remaining speech frames are analyzed such that the speech frames having the lowest power values are used to create a histogram of power/frequency. This histogram contains information from which the noise-in-speech power spectrum is derived.

44752130, Oct 2, 1984

Dec 27, 1982

6/453502

Raymond S. Medaugh - Middletown NJ

AT&T Bell Laboratories - Murray Hill NJ

H04L 2516

375 27

Accumulation of distortion possibly resulting from multiple digital code conversions is prevented by including in an ADPCM-to-PCM decoder (100, FIG. 1 or 600, FIG. 6) an arrangement (119, FIG. 1 or 601, FIG. 6) for making a trial transmission of the resulting PCM sample (. PSI. (k)) to obtain (via 209, FIG. 2) a composite noise value (. alpha. (k)) for the PCM sample (. PSI. (k)). The composite noise value includes noise components resulting from both quantizing the code word and truncating digital signals used in the decoder and subsequent coder. The composite noise value is evaluated (via 211) to determine whether adjustment of the PCM sample value (. PSI. (k)) is necessary. In one embodiment (FIG. 1, 100), a reconstructed linear version (Y. sub. r (k)) of the PCM sample is adjusted (via 216, 218, 220 or 221) when the composite noise value (. alpha.