NDLI: High-quality speech at low bit rates: Multi-pulse and stochastically excited linear predictive coders

Content Provider	IEEE Xplore Digital Library
Author	Atal, B.
Copyright Year	1986
Description	Author affiliation: AT&T Bell Laboratories, Murray Hill, New Jersey, USA (Atal, B.)
Abstract	We will present in this paper some recent developments in low bit rate speech coding research. Two new speech coding algorithms - multi-pulse LPC and stochastic coding (code-excited linear prediction) - have been proposed recently to achieve high quality speech at bit rates below 10 kbits/sec. Both of these algorithms use a linear filter to synthesize speech at the receiver but they differ in the methods used to generate the excitation for the linear filter. The multi-pulse model assumes that the excitation can be represented with sufficient accuracy as a sequence of pulses (typically 4 to 8 pulses every 5 msec). In stochastic coders, the excitation is selected from a random codebook of white Gaussian sequences. The optimum excitation in both these coders is chosen to minimize a subjective error criterion based on properties of human auditory perception. Although these coding algorithms are complex requiring over 10 million multiply-add operations per second, new fast digital signal processor chips offer the possibility of their real-time implementation.
Starting Page	1681
Ending Page	1684
File Size	115006
Page Count	4
File Format	PDF
DOI	10.1109/ICASSP.1986.1169247
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1986-04-07
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bit rate Speech synthesis Vocoders Speech coding Signal processing algorithms Nonlinear filters Linear predictive coding Stochastic processes Digital signal processors Telephony
Content Type	Text
Resource Type	Article

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