Predictive technique for signal to mask ratio calculations

Details Predictive technique for signal to mask ratio calculations Predictive technique for signal to mask ratio calculations

1995-11-06

1998-04-07

Knepper, David D.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704226, 704206, G10L 914, G10L 700

Patent

active

057377219

ABSTRACT:
Using frequency and time masking effects to encode an audio signal. The frequency band of the digital audio signal is divided into a number of subbands. First signal-to-mask ratios for the respective subbands are estimated in response to digital signal samples in each subband of the ith frame included in the audio signal. The first signal-to-mask ratio for the ith frame are stored for a predetermined time period and delayed signal-to-mask ratios for the (i-1)st frame are prestored and synchronized with the first signal-to-mask ratios. Second signal-to-mask ratios are based on the first signal-to-mask ratios and the delayed signal-to-mask ratios. Adaptive bit allocations for each of the subbands are based on the second signal-to-mask ratios Digital signal samples are quantized in each subband in response to the generated bit allocation information for each of the subbands. Finally, the quantized digital signal samples are formatted using the generated bit allocation information.

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