Patent ID: 7788105
Filing Date: 2010-08-31
Classification: G10L

Abstract:
1. A wideband speech coding apparatus comprising: a first unit to identify whether an input speech signal is a wideband speech signal or a narrowband speech signal and generate a wideband/narrowband information indicating whether the input speech signal is the wideband speech signal or the narrowband speech signal; a second unit to produce coded data by performing a first wideband speech coding, when the first unit identifies that the input speech signal is the wideband speech signal; a third unit to convert a sampling rate of the input speech signal so as to be adapted to a sampling rate corresponding to the first wideband speech coding and output converted narrowband speech signal, when the first unit identifies that the input speech signal is the narrowband speech signal; a fourth unit to receive the wideband/narrowband information from the first unit and produce coded data by subjecting the input speech signal, whose sampling rate is converted by the third unit, to a second wideband speech coding, which is obtained by modifying a number of pulses regarding a pulse position candidate setting section or a noise codebook searching section of the first wideband speech coding for narrowband based on the received wideband/narrowband information; and a fifth unit to output a result of coding of one of the second unit and the fourth unit.