[UCI-Calit2] Speech Coding: From LPC to CELP

[Anna Lynn Spitzer]

Title:                                                   Personal
Reflections on Research in Speech Coding: From LPC (linear predictive
coding) to CELP (code-excited linear prediction)

 

Speaker:                                            Bishnu S. Atal,
University of Washington, Seattle

 

Time:                                                  Noon    

 

Date:                                                   Thursday, May 24

 

Location:                                            Calit2 Auditorium

 

Abstract:                                             Research in speech
coding originated about 75 years ago. It all started with the desire to
transmit voice signals over undersea telegraph cables. Atal joined Bell
Labs, Murray Hill in 1961 and started his research in speech coding
(compression) in 1966, before there were good applications in sight. In
his talk, he will share personal impressions of this research as he
navigated his way, from basic LPC to multi-pulse and to code-excited
linear prediction (CELP). The semiconductor revolution produced faster
and faster DSP chips and made CELP practical. Speech coding technology
is widely used now in many applications, such as digital cellular
phones, personal computers and VoIP.  

 

Bio:                                                     Bishnu S. Atal
is an affiliate professor in the Department of Electrical Engineering at
the University of Washington, Seattle, WA.   He retired in March 2002
after working for more than 40 years at Lucent Bell Labs and AT&T Labs.
He was a technical director at the AT&T Shannon Laboratory, Florham
Park, New Jersey, where he was engaged in research in speech coding and
in automatic speech recognition. Previously, he was the head of the
Acoustics and Audio Communication Research Department at Bell
Laboratories, Murray Hill, N.J. He was named a Bell Laboratories Fellow
in 1994 and an AT&T Fellow in 1997.

 

Atal received the B.Sc. (Honors) degree in physics from the University
of Lucknow (India) in 1952, the diploma in electrical communication
engineering from the Indian Institute of Science, Bangalore (India) in
1955, and a doctorate degree in electrical engineering from the
Polytechnic Institute of Brooklyn, New York, in 1968. He joined the
technical staff of AT&T Bell Laboratories in 1961, became head of the
Acoustics Research Department in 1985, and head of the Speech Research
Department in 1990.

 

His research work centered in the fields of acoustics and speech
processing covering a wide range of topics, such as computer simulation
of  concert halls, fading in mobile radio, automatic speaker
recognition, and low bit rate speech coding. He is internationally
recognized for his contributions to speech analysis, synthesis and
coding. His pioneering work in linear predictive coding of speech
established linear prediction as one of the most important speech
analysis techniques, leading to many applications in coding, recognition
and synthesis of speech.

 

Atal invented multi-pulse linear predictive coding and code-excited
linear prediction (CELP) which have found widespread applications in
efficient transmission of speech in telephone networks. The CELP voice
coders have been adopted as standards for digital transmission of voice
on cellular radio systems in North America, Europe, Japan and elsewhere
in the world to meet the increasing demand for cellular phones.  His
current research interests include low bit rate speech coding and
automatic speech recognition. His research work is documented in more
than 90 technical papers and he holds 17 U.S. and numerous international
patents in speech processing.

 

He was elected to the National Academy of Engineering in 1987 and to the
National Academy of Sciences in 1993. He is a Fellow of the Acoustical
Society of America and the IEEE. He received the IEEE Signal Processing
Society Award in1993 for contributions to linear prediction of speech,
multi-pulse and code-excited source coding, and the 1975 IEEE ASSP
Society Technical Achievement Award for fundamental contributions to
linear predictive coding of speech signals. In 1980 he received, jointly
with M. R. Schroeder, the IEEE ASSP Senior Award. He is the recipient of
the IEEE Centennial Medal in 1984 and the IEEE Morris N. Liebmann
Memorial Field Award in 1986 for his pioneering contributions to linear
predictive coding for speech processing. He received the Thomas Edison
Patent Award from the R&D Council of New Jersey in 1994, and the New
Jersey Inventors Hall of Fame "Inventor of the Year Award" in 2000. He
was awarded the Benjamin Franklin Medal in Electrical Engineering in
2003. Other recipients of this prestigious award include Alexander
Graham Bell, Guglielmo Marconi, and John Pierce. He has co-edited two
books, "Advances in Speech Coding" and "Speech and Audio Coding for
Wireless Network Applications," with V. Cuperman and A. Gersho.

 

Additional Information:                     Event is co-sponsored by
Calit2 at UCI, Center for Pervasive Communications and Computing, and the
Department of Biomedical Engineering. It is free and open to the public.

 

 

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