Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1997-10-02
1999-11-02
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704229, 704500, 379 88, 379 89, G10L 504
Patent
active
059787570
ABSTRACT:
In a voice messaging system, as voice memory fills, voice messages are retrieved from memory, re-compressed at a higher compression ratio and re-stored to memory as necessary to maintain a balance between stored voice quality and available memory for storage of new voice messages. The messages may be compressed using ADPCM, CELP, LPC or bit robbing. By re-compressing previously-stored voice messages on an as needed basis, a balance can be maintained between the need to maximize available memory while at the same time maintain the highest voice quality possible for the newest messages. While memory utilization is low, messages can be maintained in memory using a high voice quality, low compression ratio. However, as memory utilization is shrunk due to the storage of more messages, previously stored or other selected voice messages are re-compressed at a higher compression ratio while the newer messages continue to be compressed at the lowest compression ratio.
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Chawan Vijay B.
Hudspeth David R.
Lucent Technologies - Inc.
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