06363339 is referenced by 35 patents and cites 2 patents.

In recent years, the telecommunications industry has witnessed the proliferation of a variety of digital vocoders in order to meet bandwidth demands of different wireline and wireless communication systems. The rapid growth in the diversity of networks and the number of users of such networks is increasing the number of instances where two vocoders are placed in tandem to serve a single connection. Such arrangements of low bit-rate codecs can degrade the quality of the transmitted speech. To overcome this problem in the specific situation involving store-and-forward systems (e.g. voicemail), the invention provides a novel method and apparatus including a plurality of different vocoders that can be selectively invoked to process the voice signal so as to reduce signal degradation. Also, the apparatus has the capability to bypass the vocoder bank when exchanging data with a remote signal processor capable of accepting data frames in compressed format.

Title
Dynamic vocoder selection for storing and forwarding voice signals
Application Number
8/948315
Publication Number
6363339 (B1)
Application Date
October 10, 1997
Publication Date
March 26, 2002
Inventor
Girish Patel
Plano
TX, US
Rafi Rabipour
Côte St. Luc
US
Assignee
Nortel Networks
US
IPC
G10L 19/00
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