By Topic

Low rate speech coding using contour quantization

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Picone, J. ; AT&T Bell Laboratories, Naperville, Illinois ; Doddington, G.

Vector quantization-based approaches to speech coding have generated new interest in very low bit rate speech coding, that is, speech coded to bit rates below 1200 bits/sec. To achieve such low bit rates, it is necessary to quantize the pitch and energy parameters at rates below 100 bits/sec. Contour quantization is introduced as a technique in which the contour of a given parameter is normalized by a nominal value and vector quantized. Contour quantization is shown to be extremely robust and efficient in encoding the pitch and energy parameters of the LPC vocoder. In this paper, a low rate speech coding system which uses contour quantization to encode the LPC excitation is presented. The system is a fixed bit rate system which is intended to operate at bit rates ranging from 400 bits/s to 800 bits/s. The overall system delay varies from 300 ms at 800 bits/s to 400 ms at 400 bits/s. At 800 bits/s, the system achieved a score of 89 on a three male speaker DRT, and a score of 81 on a three female speaker DRT.

Published in:

Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '87.  (Volume:12 )

Date of Conference:

Apr 1987