Sunil X Satyamurti

US Patent:

6370500, Apr 9, 2002

Filed:

Sep 30, 1999

Appl. No.:

09/409187

Inventors:

Jian-Cheng Huang - Lake Worth FL
Sunil Satyamurti - Lake Worth FL
Floyd Simpson - Lantana FL
Kenneth Finlon - Wellington FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G10L 1900

US Classification:

704208, 704214, 704207, 704215

Abstract:

A technique is used in a speech encoder ( ) that reduces non-speech activity of a low bit rate digital voice message. Speech model parameters that include quantized speech spectral parameter vectors are generated in a sequence of frames. A determination is made as to which frames of the sequence of frames are voiced frames and which frames are unvoiced frames. A consecutive sequence of frames of unvoiced frames is identified ( ) as an unvoiced burst when a length, N , of the consecutive sequence of frames exceeds a predetermined length, N. A non-speech activity portion of the unvoiced burst is identified ( ) and removed.

US Patent:

6418405, Jul 9, 2002

Filed:

Sep 30, 1999

Appl. No.:

09/410140

Inventors:

Sunil Satyamurti - Lake Worth FL
Jian-Cheng Huang - Lake Worth FL
Floyd Simpson - Lantana FL
Kenneth Finlon - Wellington FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G10L 1900

US Classification:

704206, 704222, 704230

Abstract:

A system controller ( ) includes a speech encoder ( ) that dynamically segments frames of a low bit rate digital voice message. Speech model parameters have been generated in a sequence of frames. The speech model parameters include quantized speech spectral parameter vectors. The speech encoder selects ( ) a first quantized speech spectral parameter vector as a current anchor vector, selects ( ) a second quantized speech spectral parameter vector located a predetermined number of frames (L ) from the current anchor vector as a target speech parameter vector, and perturbs ( ) the target speech parameter vector to derive a plurality (K) of perturbed speech parameter vectors.

US Patent:

6418407, Jul 9, 2002

Filed:

Sep 30, 1999

Appl. No.:

09/410007

Inventors:

Jian-Cheng Huang - Lake Worth FL
Floyd Simpson - Lantana FL
Sunil Satyamurti - Lake Worth FL
Kenneth Finlon - Wellington FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G10L 1104

US Classification:

704207, 704217, 704219

Abstract:

A pitch determiner ( ) of a system controller ( ) that generates a smoothed pitch value for a current frame of a low bit rate voice message includes a pitch function generator ( ) that generates a pitch detection function (PDF) for each frame of digital samples of a voice signal, a pitch candidate selector ( ) that selects a future frame pitch candidate from a pitch detection function (PDF), and a pitch adjuster ( ) that generates the smoothed pitch value. The pitch adjuster includes a subharmonic pitch corrector ( ) that determines a future frame pitch value by performing pitch subharmonic correction of a future frame pitch candidate using a roughness factor of the frequency transformed window.

US Patent:

6496798, Dec 17, 2002

Filed:

Sep 30, 1999

Appl. No.:

09/409183

Inventors:

Jian-Cheng Huang - Lake Worth FL
Floyd Simpson - Lantana FL
Sunil Satyamurti - Lake Worth FL
Oleg Andric - West Palm Beach FL
Kenneth Finlon - Wellington FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G10L 1900

US Classification:

704230, 704201

Abstract:

A system controller ( ) includes a speech encoder ( ) that encodes a low bit rate digital voice message. The speech encoder sets values of words of a header of the encoded message. The values of the words define a quantity of frames in the voice message, N, and define a vocoder rate used for the encoded message. The speech encoder sets a state of each indicator in each frame status field of N frame status fields that are transmitted after the header of the encoded message. The speech encoder assembles N frame data fields, wherein each of the frame data fields comprises a set of data words. The N frame data fields follow the N frame status fields. Each set of data words conforms to at least one of the vocoder rate and the states of the indicators. A decoder ( ) decodes the encoded low bit rate digital message.

US Patent:

6707826, Mar 16, 2004

Filed:

Mar 20, 2000

Appl. No.:

09/531292

Inventors:

Paul Edward Gorday - West Palm Beach FL
Sunil Satyamurti - Lake Worth FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04J 316

US Classification:

370468, 370494, 455416

Abstract:

A bandwidth efficient method of wireless communication among simultaneous multiple users includes the steps of monitoring ( ) for voice activity from a plurality of sources ( or ) on a channel and detecting voice activity ( ) among the plurality of sources during a predetermined time period. If voice activity is detected from only a first source, then code the voice activity from the first source and transmit a full-rate packet of data ( ) to a wireless subscriber ( ). If voice activity is detected from at least a first source and a second source amounting to N sources, then code such N sources using a 1/N-rate vocoder to obtain N different 1/N rate data packets ( ) and combining ( ) the N 1/N-rate data packets from at least the first source and the second source before transmitting ( ) a full packet of data to the wireless subscriber.

US Patent:

6772126, Aug 3, 2004

Filed:

Sep 30, 1999

Appl. No.:

09/410006

Inventors:

Floyd Simpson - Lantana FL
Jian-Cheng Huang - Lake Worth FL
Sunil Satyamurti - Lake Worth FL
Kenneth Finlon - Wellington FL
Robert Schwendeman - Pompano Beach FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G10L 2104

US Classification:

704500, 704222

Abstract:

A system controller ( ) is for transferring a low bit rate digital voice message. The system controller generates from an analog voice signal representing the voice message a set of speech model parameters, and generates a first derived set of speech model parameters from a first subset of the set of speech model parameters, the first derived set encoding the voice signal at a second voice quality and second vocoder rate that are less, respectively, than a first voice quality and vocoder rate. The system controller transmits ( ) the low bit rate-digital voice message comprising the first derived set of speech model parameters to a communication receiver ( ). The communication receiver requests ( ) an incremental message when the quality of the voice message is unsatisfactory. The system controller generates and transmits ( ) an incremental message-and the communication receiver uses ( ) the incremental message to generate a higher quality voice message.

US Patent:

56994044, Dec 16, 1997

Filed:

Jun 26, 1995

Appl. No.:

8/494662

Inventors:

Sunil Satyamurti - Delray Beach FL
Salvador Sibecas - Lake Worth FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04M 1100
G10L 302

US Classification:

379 57

Abstract:

A communication system using voice compression includes a transmitter base station (113) and a selective call receiver (112). The transmitter base station (113) includes an input device (204) to receive an audio voice message which is stored in a memory (209). A processing device (208) digitizes the audio voice message to provide an input signal which is divided into a sequence of equivalent time frames, and differences in a short-term frequency spectrum between adjacent time frames is determined to derive distance measurements. A speed factor is computed as an average of the distance measurements, and the input signal is time-scales in accordance with the speed factor and then transmitted by a transmitter (102). The selective call receiver (112) includes a receiver (105) which receives the time-scaled signal, a processing device (115, 106) which demodulates and expands the time-scaled signal in accordance with the speed factor to provide a reconstructed signal which is amplified by an amplifier (108) into an audio signal.

US Patent:

59208406, Jul 6, 1999

Filed:

Feb 28, 1995

Appl. No.:

8/395739

Inventors:

Sunil Satyamurti - Delray Beach FL
Clifford Dana Leitch - Coral Springs FL
Robert John Schwendeman - Pompano Beach FL
Kazimierz Siwiak - Coral Springs FL
William Joseph Kuznicki - Coral Springs FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G10L 302

US Classification:

704267

Abstract:

A method and apparatus for time-scale modification of speech using a modified version of the Waveform Similarity based Overlap-Add technique (WSOLA) comprises the steps of storing a portion of an input speech signal in a memory, analyzing the portion of the input speech signal to determined at least one filtered pitch value, calculating an estimated pitch value (12) from the at least one filtered pitch value, determining a segment size (14) in response to the estimated pitch value (12), the segment size (14) having a value greater than the estimated pitch value (12), and time-scale compressing (18) the input speech signal in response to the segment size determined.