Bandwidth Extension for China AVS-M standard

Abstract

We proposed a new frequency domain bandwidth extension (BWE) technology. In the new technology, FFT based frequency domain gain shaping combined with linear prediction coding (LPC) based spectral envelope shaping is used for generating high frequency signals. To preserve the amount of noise component in the reconstructed band, gain reduction controlled by spectrum flatness measurement (SFM) is employed. Subjective testing results show that the presented technology exhibits a comparable performance compared to 3GPP AMR-WB+ with the same bit-rate in the framework of audio video coding of China standard (AVS) Part 10 - mobile speech and audio Codec. This technology has been formally adopted as the artificial high band coding module in AVS P10.