UBM: TECH DIGITAL RESOURCE LIBRARY

KDDI


Whitepaper: Conversion of MP3 to AAC in the Compressed Domain

by KDDIJan 01, 2008

This paper proposes an efficient algorithm for conversion of an MP3 stream into Advanced Audio Coding (AAC). The re-encoding based transcoding process may result in degradation of quality and take longer than encoding from a PCM signal. This paper proposes a method to inherit the frame structure and quantization scale from MP3 to AAC. This enables a reduction in the iteration process, which requires the most time in the AAC encoding process, without incurring degradation in quality.