AUDIO ENCODING APPARATUS AND AUDIO DECODING APPARATUS

摘要

An auxiliary multi-pulse setting circuit sets candidates of pulse positions so that the pulse positions to which no pulse is located are selected in an auxiliary multi- pulse searching circuit prior to the pulse positions at which pulses have already been encoded in a multi-pulse searching circuit. The auxiliary multi-pulse searching circuit generates an auxiliary multi-pulse signal according to the candidates of pulse positions set in the auxiliary multi-pulse setting circuit and encodes the auxiliary multi-pulse signal so that difference between the reproduced audio signal which is obtained by driving a linear predictive synthesis filter with the auxiliary multi-pulse signal and an input audio signal is minimized similarly to the multi-pulse searching circuit.