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Multipulse Excited Linear Predictive Coder

IP.com Disclosure Number: IPCOM000061354D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Galand, C Lancon, E Menez, J [+details]

Abstract

The concept of multipulse excited (MPE) linear predictive coder has been proposed in 1982 by B. S. Atal [1], and has been extensively studied since that time. This type of technique has been shown to provide good quality speech at low to medium bit rates. In 1984, Atal proposed an improvement of the MPE techniques [2], based on its association with long-term prediction technique (LTP). We here propose an alternate to this approach, allowing better performance. Fig. 1 represents the analysis part of the coder. The speech signal S(n) is first deconvoluted by the vocal tract inverse filter. The short-term residual R(n) is then fed to a structure where the long-term prediction filter is placed in a loop around the MPE coder.