Subband synthesis filtering process and apparatus

Details Subband synthesis filtering process and apparatus Subband synthesis filtering process and apparatus

2006-06-15

2009-12-22

Opsasnick, Michael N (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S501000

Reexamination Certificate

active

07636660

ABSTRACT:
A subband synthesis filtering apparatus for M sets of signals is provided. Each set of signals includes N subband sample signals. The apparatus includes a processor for processing the ith set of signals among the M sets of signals, wherein i is an integer index ranging from 0 to (M−1). The processor includes a DCT converting module and a generating module. The DCT converting module converts the N subband sample signals of the ith set of signals into N converted vectors. If i is an odd number, the (2j−1)th subband sample signal among the N subband sample signals is multiplied by negative one in the converting module, wherein j is an integer index ranging from 1 to (N/2). The generating module generates N pulse code modulation signals based on the N converted vectors.

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