Patent ID: 8639501
Filing Date: 2014-01-28
Classification: G10L

Abstract:
1. A method of enhancing spatial audio signals, comprising: receiving an Algebraic Code Excited Linear Prediction (ACELP) coded audio signal comprising a plurality of blocks; for each received block, estimating a signal type based on at least one of the received signal and a set of decoder parameters, wherein estimating the signal type comprises: estimating a pitch frequency based on at least one of the received signal and the set of decoder parameters; determining filtering parameters based on at least one of the estimated signal type and the estimated pitch frequency, wherein the filtering parameters include a cut-off off frequency, wherein the cut-off frequency is set below the lowest pitch frequency if it is determined that the signal block includes the narrow band-pass component and wherein the cut-off frequency is decreased towards 50 Hz if it is determined that the narrow signal block does not include the narrow band-pass component; and high pass filtering the received signal based on the determined filter parameters to provide a high pass filtered output signal.