Transform coding of audio signals at 64 kbit/s

The coding of high-quality sound at 64 kb/s is of interest for applications such as ISDN. The algorithm described allows the reduction to such a bit rate while maintaining the original quality. It is based on transform coding, and uses a time-domain aliasing cancellation (TDAC) transformation. Perceptual properties and the interblock redundancy of the spectrum are involved when coding the transform coefficients. The complexity of the algorithm allows its real-time implementation on a one floating-point digital signal processor, such as the ATT DSP 32C. The performance and subjective results of the coding system are discussed.<
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