Parametric Stereo Coding (PS) tool is used to reconstruct stereo signal from the monaural signal. The tool can be jointly used with the HE-AAC to have high compression ratio and is referred to as the parametric HE-AAC in this paper. The PS tool is able to capture the stereo image of the audio input signal into a limited number of parameters, requiring only a small overhead. In MPEG-4 HE-AAC, the PS tool segments a frame into several regions in time domain and into stereo bands in frequency domain to deliver stereo parameter sets. This paper considers the design of the stereo parameters. These methods are integrated in the NCTU-HE-AAC and the objective experiments are conducted to check the quality.
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