Digital audio encoder with window size depending on voice multip

Details Digital audio encoder with window size depending on voice multip Digital audio encoder with window size depending on voice multip

1995-06-07

1998-03-24

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

381 2, G01L 302, H04H 500

Patent

active

057323860

ABSTRACT:
A digital audio encoder that enables the digital signal processing of a stereo audio signal and multiplexed voice data by extending a two-channel digital audio system of comparatively simple construction. Stereo audio data and multiplexed voice data are sampled and scaled for adjusting the range of the signals. Thereafter, a window is applied to the data. With the window, adjacent blocks are overlapped in order to eliminate noise between the blocks. MDCT and MDST functions are performed using the same size window for extracting and normalizing MDCT and MDST coefficients which respectively indicate an exponent and a mantissa. The mantissa consists of fixed bit data and variable bit data. In order to determine the fixed bit data, fixed bit data are allocated on a sub-band basis. In order to determine the variable bit data, each of the remaining bits are allocated on a sub-band basis from the lowest frequency band. Thereafter, quantization is performed. If multiplexed voice data is not present, 512 pieces of data are processed in each frame. If multiplexed voice data is present, 1024 pieces of data are processed in each frame.

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Robert J. McAulay and Thomas F. Quatieri, "Low-Rate Speech Coding Based on the Sinusoidal Model", chapter 6 in Advances In Speech Signal Processing, ed. by Sadaoki Furui and M. Mohan Sondhi, Marcel Dekker, Inc., pp. 165-208, 1991.

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