Real-time implementation of second generation of audio multilevel information coding

Murtaza Ali; Ahmed H. Tewfik; V. Viswanathan

doi:10.1117/12.170026

15 March 1994 Real-time implementation of second generation of audio multilevel information coding

Murtaza Ali, Ahmed H. Tewfik, V. Viswanathan

Proceedings Volume 2242, Wavelet Applications; (1994) https://doi.org/10.1117/12.170026
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

This paper describes real-time implementation of a novel wavelet- based audio compression method. This method is based on the discrete wavelet (DWT) representation of signals. A bit allocation procedure is used to allocate bits to the transform coefficients in an adaptive fashion. The bit allocation procedure has been designed to take advantage of the masking effect in human hearing. The procedure minimizes the number of bits required to represent each frame of audio signals at a fixed distortion level. The real-time implementation provides almost transparent compression of monophonic CD quality audio signals (samples at 44.1 KHz and quantized using 16 bits/sample) at bit rates of 64-78 Kbits/sec. Our implementation uses two ASPI Elf boards, each of which is built around a TI TMS230C31 DSP chip. The time required for encoding of a mono CD signal is about 92 percent of real time and that for decoding about 61 percent.

Citation Download Citation

Murtaza Ali, Ahmed H. Tewfik, and V. Viswanathan "Real-time implementation of second generation of audio multilevel information coding", Proc. SPIE 2242, Wavelet Applications, (15 March 1994); https://doi.org/10.1117/12.170026

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