Robert J Rapp

US Patent:

58842683, Mar 16, 1999

Filed:

Jun 27, 1997

Appl. No.:

8/883977

Inventors:

William Michael Campbell - Phoenix AZ
Clifford Allan Wood - Tempe AZ
James Earl Womack - Bedford TX
Wade Alan Bastien - Euless TX
Deborah Ann Calie - Fort Worth TX
Robert Andrew Rapp - Carrollton TX
Terence Edward Sumner - Azle TX

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G10L 302

US Classification:

704278

Abstract:

A processing system time compresses a voice message before transmission, and processing system time expands the message after reception. To process the message the processing systems perform at least one of: (a) randomizing the order of a sequence of samples form a silent portion of the message after reception thereof before blending the sequence with a last portion of the expanded message; (b) selecting the sequence of samples from the silent portion of the message after reception thereof, the sequence selected being poorly correlated with the last portion of the expanded message, before blending the sequence with the last portion of the message; and (c) compressing the dynamic range of the message before transmission, by an amount dependent upon the signal-to-noise ratio of the message, and aggressively expanding the dynamic range of the message after reception, by a fixed amount.