Lloyd T Smith

US Patent:

50254715, Jun 18, 1991

Filed:

Aug 4, 1989

Appl. No.:

7/389682

Inventors:

Brian L. Scott - Denton TX
Lloyd A. Smith - Denton TX
J. Mark Newell - Denton TX
Bruce E. Balentine - Denton TX
Lisan S. Lin - Denton TX

Assignee:

Scott Instruments Corporation - Denton TX

International Classification:

G10L 500

US Classification:

381 43

Abstract:

Speech signals are analyzed by correlating a sequence of samples to derive a sliding average magnitude difference function (SAMDF) whereby histograms are formed which are compressed and normalized to form histogram sequences representing the speech signal for comparison and recognition.

US Patent:

49691937, Nov 6, 1990

Filed:

Jun 26, 1989

Appl. No.:

7/372230

Inventors:

Brian L. Scott - Denton TX
R. Gary Goodman - Denton TX
J. Mark Newell - Denton TX
Lloyd A. Smith - Denton TX

Assignee:

Scott Instruments Corporation - Denton TX

International Classification:

G10L 302

US Classification:

381 38

Abstract:

A method and apparatus for generating a signal transformation useful in signal processing. According to the preferred embodiment, a signal, e. g. , a speech waveform, is first converted into a sequence of digital data samples, and a reference position along a first sub-part of the sequence is then selected. A "weighted" histogram corresponding to the reference position is then generated according to a correlation function. Thereafter, a new reference position is selected, for example, at a sub-part of the sequence located a pitch period of the signal from the original reference position, and an additional histogram is generated for this sub-part. The plurality of histograms comprise the transformation of the signal, which retains a substantial part of the informational content of the original signal. Therefore, the transformation is then used as the signal itself in signal processing applications such as speech compression and synthesis.