Patent ID: 6564187
Filing Date: 2003-05-13
Classification: G10L

Abstract:
An apparatus for compression and expansion of a wave signal on a time axis, the apparatus comprising:a memory device that stores waveform data representative of a waveform for each sub-frequency band of each main-frequency band of a wave signal, in which the wave signal is divided into a plurality of the main-frequency bands, each of the main-frequency bands is divided into a plurality of the sub-frequency bands; a plurality of time axis compression and expansion devices, each provided for each of the sub-frequency bands for performing, based on the waveform data for each of the sub-frequency bands, a time axis compression and expansion of the waveform that is represented by the waveform data; and a mixing device that mixes signals provided from the plurality of time axis compression and expansion devices, wherein each of the plurality of time axis compression and expansion devices performs compression and expansion at a sampling rate that corresponds to one of the main-frequency bands to which the sub-frequency band that is subject to the waveform time axis compression and expansion belongs, and wherein a sampling rate of at least one of the main-frequency bands is different from a sampling rate of at least one other of the main-frequency bands.