September 22-25, 1997
In voice coding applications where there is no constraint on the encoding delay, such as store and forward message systems or voice storage, segment coding techniques can be used to achieve a reduction in data rate without compromising the level of distortion. For low data rate linear predictive coding schemes, increasing the encoding delay allows one to exploit any long term temporal stationarities on an inter&ame basis, thus reducing the transmission bandwidth or storage needs of the speech signal. Transform coding has previously been applied to exploit both the inter and intra frame correlation, but has been limited to short term spectral redundancy [ 1 ] . This paper investigates the potential for data rate reduction through extending the use of segment coding techniques to identify redundancies in the LPC residual. Initial tests indicate a potential 40% average reduction in data rate for a given subjective speech quality.
Bibliographic reference. Mudugamuwa, Damith J. / Bradley, Alan B. (1997): "Adaptive transform coding for linear predictive residual", In EUROSPEECH-1997, 433-436.