Patent ID: 6192334
Filing Date: 2001-02-20
Classification: G10L

Abstract:
An audio encoding apparatus for encoding in multiple stages a multi-pulse signal representing an excitation signal of a reproduced audio signal by plural pulses so that a difference between said reproduced audio signal and an input audio signal is minimized, said reproduced audio signal being obtained by driving a linear predictive synthesis filter with said excitation signal which corresponds to said multi-pulse signal, said audio encoding apparatus comprising:a multi-pulse setting circuit, between said stages which sets pulse position candidates so that position candidates in which no pulse is located in a preceding stage or stages are selected prior to position candidates in which pulses have been already encoded in preceding stages; anda multi-pulse searching circuit, in each of said multiple stages, which encodes said multi-pulse signal by searching a pulse or pulses among said position candidates set by said multi-pulse setting circuit.