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Hits 1 – 5 of 5
1
Research in Speech Understanding
Schwartz, Richard
;
Makhoul, John
;
Roucos, Salim
...
In: DTIC AND NTIS (1982)
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2
Research on Narrowband Communications
Makhoul, John
;
Krasner, Michael
;
Roukos, Salim
...
In: DTIC AND NTIS (1981)
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3
Speech Compression and Synthesis
Berouti, Michael
;
Klovstad, John
;
Makhoul, John
...
In: DTIC AND NTIS (1980)
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4
Speech Compression and Synthesis
Berouti, Michael
;
Makoul, John
;
Schwartz, Richard
;
Sorensen, John
In: DTIC AND NTIS (1980)
Abstract:
This report concludes our work for the past two years on speech compression and synthesis. A real-time variable-frame-rate LPC vocoder was implemented operating at an average rate of 2000 bits/s. We also tested our mixed-source model as part of the vocoder. To improve the reliability of the extraction of LPC parameters, we implemented and tested a range of adaptive lattice and autocorrelation algorithms. For data rates above 5000 bits/s, we developed and tested a new high-frequency regeneration technique, spectral duplication, which reduces the roughness in the synthesized speech. As the first part of our effort towards a very-low-rate (VLR) vocoder, we implemented a phonetic synthesis program that would be compatible with our initial design for a phonetic recognition program. We also recorded and partially labeled a large data base of diphone templates. During the second year we continued our work toward a VLR vocoder, and also developed a multirate embedded-coding speech compression program that could transmit speech at rates varying from 9600 to 2400 b/s. The phonetic synthesis program and the labeling of the diphone template network were completed. There are currently 2845 diphone templates. We also implemented an initial version of a phonetic recognizer based on a network representation of diphone templates. The recognizer allows for incremental training of the network by modification of existing templates or addition of new templates. ; Sponsored in part by DARPA.
Keyword:
*SPEECH COMPRESSION
;
*VOCODERS
;
ADAPTIVE FILTERS
;
AUTOCORRELATION
;
CODING
;
DATA RATE
;
DIGITAL FILTERS
;
DIPHONES
;
HIGH RATE
;
LINEAR SYSTEMS
;
LPC(LINEAR PREDICTIVE CODING)
;
Non-radio Communications
;
PHONETICS
;
REAL TIME
;
RELIABILITY
;
SPEECH
;
SPEECH SYNTHESIS
;
SYNTHESIS
;
TRANSFORMATIONS(MATHEMATICS)
URL:
http://www.dtic.mil/docs/citations/ADA092578
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA092578
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5
Speech Compression and Synthesis
Berouti, Michael
;
Cosell, Lynn
;
Klovstad, John
...
In: DTIC AND NTIS (1979)
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