Paul V Jacobs

US Patent:

D3759377, Nov 26, 1996

Filed:

Dec 1, 1995

Appl. No.:

D/047360

Inventors:

Steven A. Mergenthaler - Boulder CO
Dawn E. Beattie - Carlsbad CA
Paul E. Jacobs - La Jolla CA
Michael H. Daffara - Ramona CA
James C. Wightman - Bloomfield NJ
David C. Stowers - Nutley NJ

Assignee:

Qualcomm Incorporated - San Diego CA

US Classification:

D13110

US Patent:

D3768040, Dec 24, 1996

Filed:

Dec 1, 1995

Appl. No.:

D/047359

Inventors:

Steven A. Mergenthaler - Boulder CO
Dawn E. Beattie - Carlsbad CA
Paul E. Jacobs - La Jolla CA
Wade L. Heimbigner - Poway CA
David C. Stowers - Nutley NJ
Mark E. Millman - Holmdel NJ

Assignee:

QUALCOMM Incorporated - San Diego CA

US Classification:

D14248

US Patent:

59566736, Sep 21, 1999

Filed:

Jan 25, 1995

Appl. No.:

8/378300

Inventors:

Lindsay A. Weaver - Boulder CO
S. Katherine Lam - San Diego CA
William Gardner - San Diego CA
Paul Jacobs - La Jolla CA

International Classification:

G10L 918
H04Q 724

US Classification:

704221

Abstract:

A first remote vocoder receives analog voice and produces packetized vocoder data which is transmitted over a wireless link. A first local vocoder receives the packetized vocoder data from the wireless link. The first local vocoder converts the packetized data to a multibit PCM output. The first local vocoder also adds a detection code to one of the least significant bits (LSB) of the PCM output. The first local vocoder passes the PCM signal to the PSTN from the second end user. The first local vocoder also receives PCM input over the PSTN. The first local vocoder constantly monitors the least significant bit of the PCM input for a detection code indicating that a second local vocoder is connected at the receiving end. If the first local vocoder detects the detection code from the second local vocoder, it begins to substitute packetized data and a redundancy check for a second one of the LSB's of the outgoing PCM. The first local vocoder also begins to monitor the second one of the LSB's of the incoming PCM.

US Patent:

D3757404, Nov 19, 1996

Filed:

Dec 1, 1995

Appl. No.:

D/047357

Inventors:

Steven A. Mergenthaler - Boulder CO
Dawn E. Beattie - Carlsbad CA
Paul E. Jacobs - La Jolla CA
Daniel Waldburger - La Jolla CA
Thomas J. Chintala - San Diego CA
Stephen G. Miggels - Wyckoff NJ
David C. Stowers - Nutley NJ

Assignee:

Qualcomm Incorporated - San Diego CA

US Classification:

D14151

US Patent:

59038624, May 11, 1999

Filed:

Jan 11, 1996

Appl. No.:

8/575287

Inventors:

Lindsay A. Weaver - Boulder CO
S. Katherine Lam - San Diego CA
William R. Gardner - San Diego CA
Paul E. Jacobs - La Jolla CA
Andrew P. DeJaco - San Diego CA
Gilbert C. Sih - San Diego CA

International Classification:

G10L9/18

US Classification:

704212

Abstract:

When one vocoding system is coupled to another vocoding system, a tandem arrangement results. The tandem configuration results in voice quality degradation as speech is encoded and decoded, then encoded and decoded again. One reason for the degradation is that postfiltering performed at the output of the speech decoding process introduces distortions in the spectral content of the reconstructed speech as compared to the original speech. The present invention prevents the degradation due to the use of postfilters by modifying the postfiltering within the vocoders where a tandem configuration exists. A detection code is embedded within the data signal to indicate the existence of a tandem configuration. If the detection code is received at a vocoder, modified vocoding is established within the vocoders to prevent the degradation due to the postfiltering.