In a simple scalable audio coding scheme, there are usually two layers ' a base layer and an enhancement layer. This paper describes a frequency selective switch (FSS) control algorithm, which is employed to optimally code the signal in the enhancement layer. The FSS determines whether the original signal or the residual of the original and base layer signals is sent to the enhancement layer in certain frequency bands. The proposed method introduces some advanced mechanism to the FSS and the quantization process to achieve perceptually optimal result in the encoding process, particularly at low bitrates. These changes do not assume any modifications in the decoder.
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