Digital data encoding apparatus and method thereof

Details Digital data encoding apparatus and method thereof Digital data encoding apparatus and method thereof

1996-08-29

1998-09-22

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704230, 704219, 704500, 704501, G10L 914, G10L 916

Patent

active

058129820

ABSTRACT:
Digital data divided into blocks each having a predetermined number of samples is transformed into data on a frequency axis for each block to generate coefficient data for each frequency. Coefficient data of a predetermined number of blocks are stored in a buffer. From the buffer, coefficient data are inputted to a floating-point transforming circuit for each one block. The coefficient data are divided into a plurality of sub-bands, each sub-band including one or a plurality of coefficient data. The coefficient data are floating-point transformed for each sub-band and transformed into one sub-band common characteristic data which is common to the coefficient data included in each sub-band and mantissa data of the number equal to the number of coefficient data included in each sub-band. The sub-band common characteristic data and the mantissa data are stored in a memory. Sub-band common characteristic data of a predetermined number of blocks are read from the memory for each sub-band. One block-common characteristic data which is common to the read sub-band common characteristic data is generated. Coefficient data of a predetermined number of blocks are read from the memory for each sub-band. The read coefficient data is divided by an exponent expressed by the block-common characteristic data to generate new mantissa data.

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Chen et al. "Sub-Band Coding of Audio Using Recursively Indexed Quantization." Applications of Signal Processing to Audio and Acoustics, 00, 1995.
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Princen et al., Analysis/Synthesis Filter Bank Design Based On Time Domain Aliasing Cancellation, IEEE Transaction on Acoustic, Speech, and Signal Processing, ASSP-34, No. 5, pp. 1153-1161, Oct.1986.

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