Low Bit Rate Transparent Audio Compression using

This paper descrihes a novel wavelet based audio synthesis and coding method. The method uses optimal adap- tive wavelet selection and wavelet coefficients quantization pro- cedures together with a dynamic dictionary approach. The adaptive wavelet transform selection and transform coefficient bit allocation procedures are designed to take advantage of the masking effect in human hearing. They minimize the number of hits required to represent each frame of audio material at a fixed distortion level. The dynamic dictionary greatly reduces statistical redundancies in the audio source. Experiments in- dicate that the proposed adaptive wavelet selection procedure by itself can achieve almost transparent coding of monophonic compact disk (CD) quality signals (sampled at 44.1 kHz) at bit rates of 64-70 kilobits per second (kb/s). The combined adap- tive wavelet selection and dynamic dictionary coding proce- dures achieve almost transparent coding of monophonic CD quality signals at bit rates of 48-66 kh/s.

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