Adaptive bit assignment transform coding according to power dist

Details Adaptive bit assignment transform coding according to power dist Adaptive bit assignment transform coding according to power dist

1991-07-12

1993-11-16

Shaw, Dale M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 31, 381 34, G10L 302

Patent

active

052630889

ABSTRACT:
Digital samples of an underlying analog audio-frequency signal are converted to transform coefficients and a first bit assignment value indicating the number of quantization levels or bits is adaptively assigned to each coefficient according to the power distribution of the transform coefficients. The transform coefficients are weighted according to a prescribed pattern such as human's auditory sensitivity, and a second bit assignment value is further adaptively assigned to each transform coefficient according to the power distribution of the weighted transform coefficients. One of the first and second bit assignment values is selected according to the power distribution of the transform coefficients and used to quantize the transform coefficients. The quantized transform coefficients are multiplexed with supplemental information derived from the transform coefficients for transmission to a receiving site. A process inverse to that at the transmitting site is performed on the multiplexed signal to recover the original digital samples.

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Zelinski, et al. "Approaches to Adaptive Transform Speech Coding at Low Bit Rates", IEEE Transactions on ASSP, vol. 27.

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