Patent ID: 8433565

Claim:
An apparatus to compress a wide-band speech signal, the apparatus comprising: a narrow-band speech compressor to compress a low-band speech signal of the wide-band speech signal and output the compressed low-band speech signal as a low-band speech packet; and a high-band speech compressor to compress a high-band speech signal of the wide-band speech signal using energy information of the low-band speech signal provided from the narrow-band speech compressor, and output the compressed high-band speech signal as a high-band speech packet, wherein the high-band speech signal compressor comprises: a filter bank to split the high-band speech signal of the wide-band speech signal into a plurality of band signals with different frequency bands; an RMS calculator to calculate RMS values for each of the band signals transmitted from the filter bank; a band priority decision unit to determine priorities of the band signals split by the filter bank based on the RMS values calculated by the RMS calculator; a band signal quantization module to quantize the band signals split by the filter bank and output a quantization index for each of the bands using band priority information determined by the band priority decision unit and the energy information of the low-band speech signal; and a packetizer to packetize the band priority information and the quantization index for each band output from the band signal quantization module and output the packetized result as the high-band speech packet, wherein the band signal quantization module performs quantization operations to quantize different numbers of sub-vectors according to the band priority information.