System and method for audio data compression and decompression using discrete wavelet transform (DWT)
US7196641B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Apr 26, 2005 |
| Grant date | Mar 27, 2007 |
| Priority date | — |
| Expiry date | Apr 26, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/24
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for audio data processing including sub-systems for compression and for de-compression. The compression sub-system includes an AD converter, a segment-based multi-channel splitter splitting and segmenting signals into channels each with segments, multi-level 1D discrete wavelet transformers each discrete wavelet transforming for a respective channel each segment thereof in sequence and recursively through a predetermined number of filtering levels into wavelet coefficients, quantizers, a multiplexer multiplexing quantized wavelet coefficients into 2-D arrays, and an embedded block coder coding the 2-D arrays into code blocks, discarding some of the code blocks, truncating a bit stream embedded in each remaining code block, and stringing the truncated bit stream embedded in each remaining code block into a compressed data stream. Another compression sub-system includes a non-segment-based multi-channel splitter, and a plurality groups of 1D discrete wavelet transformers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.