05642464 is referenced by 139 patents and cites 5 patents.

In methods and apparatus for processing a speech signals comprising a plurality of successive signal intervals, each signal interval containing no speech sounds is classified as a noise interval, and LPC coefficients are calculated for each noise interval based on the samples of that noise interval and on the samples of a plurality of preceding signal intervals. When noise intervals encoded using LPC coefficients calculated as described above are reconstructed, the subjectively annoying "swishing" or "waterfall" effects encountered in conventional LPC speech processing systems are reduced or eliminated.

Title
Methods and apparatus for noise conditioning in digital speech compression systems using linear predictive coding
Application Number
8/433116
Publication Number
5642464
Application Date
May 3, 1995
Publication Date
June 24, 1997
Inventor
Rafi Rabipour
Cote St. Luc
CA
H S Peter Yue
St. Laurent
CA
Agent
C W Junkin
Assignee
Northern Telecom
CA
IPC
G10L 5/00
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