Speech compression and decompression apparatuses and methods...

Details Speech compression and decompression apparatuses and methods... Speech compression and decompression apparatuses and methods...

2004-07-02

2009-11-24

Dorvil, Richemond (Department: 2626)

Data processing: speech signal processing, linguistics, language

Audio signal time compression or expansion

C704S222000, C704S500000, C704S501000, C704S504000

Reexamination Certificate

active

07624022

ABSTRACT:
A speech compression apparatus including: a first band-transform unit transforming a wideband speech signal to a narrowband low-band speech signal; a narrowband speech compressor compressing the narrowband low-band speech signal and outputting a result of the compressing as a low-band speech packet; a decompression unit decompressing the low-band speech packet and obtaining a decompressed wideband low-band speech signal; an error detection unit detecting an error signal that corresponds to a difference between the wideband speech signal and the decompressed wideband low-band speech signal; and a high-band speech compression unit compressing the error signal and a high-band speech signal of the wideband speech signal and outputting the result of the compressing as a high-band speech packet.

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