An efficient tonal component coding algorithm for MPEG-2 Audio NBC
نویسندگان
چکیده
This paper proposes a tonal component coding algorithm for a codec that employs a transform followed by Hu man coding, such as MPEG-2 Audio NBC (Non-Backward Compatible)[1]. After the input audio signal is mapped onto a frequency domain, the proposed algorithm withdraws local maximum components that degrade coding e ciency. By this withdrawal, the atness of the spectrum increases and the e ciency in Hu man coding is improved. The withdrawn components are encoded separately as side information. When the frequency resolution of the time/frequency mapping is high, this algorithm works more e ectively since local maximum samples appear more frequently with such a mapping. Simulation results show that this algorithm achieves as much as 11% bit reduction per frame and improves the coding e ciency in 41% of all the audio frames.
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