Patent ID: 8571878

Claim:
A speech compression apparatus including one or more processing devices, the apparatus comprising: a first band-transform unit, including the at least one of the one or more processing devices to transform a wideband speech signal into a narrowband low-band speech signal such that the narrowband low-band speech signal has a narrower bandwidth and lower maximum frequency than the wideband 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; a difference detection unit generating a difference signal, having plural defined frequency bands, representing differences between the wideband speech signal and the decompressed wideband low-band speech signal through respective analyses of plural defined frequency bands of the wideband speech signal and respective analyses of plural defined frequency bands of the decompressed wideband low-band speech signal; and a high-band speech compression unit respectively compressing each of plural defined frequency bands of a high-band speech signal, derived from plural respective defined frequency band analyses of the wideband speech signal and the difference signal, and outputting a result of the compressing by the high-band speech compression unit as a high-band speech packet.