Patent ID: 8160871
Filing Date: 2012-04-17
Classification: G10L

Abstract:
1. A wideband speech coding apparatus which causes an input speech signal to be represented by spectrum parameters and an excitation signal, and codes the spectrum parameters and the excitation signal, the wideband speech coding apparatus comprising: a coding unit configured to select a plurality of pulses from given pulse position candidates, and to code the excitation signal with the selected pulses; an identification unit configured to identify whether the input speech signal is a wideband speech signal or a narrowband speech signal; a control unit configured to control the coding unit to select a pulse position candidate having a time resolution which is set in advance in accordance with the wideband speech signal, when the identification unit identifies that the input speech signal is the wideband speech signal, and to control the coding unit to lower the time resolution of the pulse position candidate, when the identification unit identifies that the input speech signal is the narrowband speech signal; a converter configured to convert a sampling rate of the input speech signal to a predetermined sampling rate for wideband speech coding; and an output unit to output a result of coding by the coding unit.