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专利名称：Audio compression and decompression
using integer-reversible modulated lappedtransforms
发明人：Henrique S. Malvar申请号：US11688851申请日：20070320公开号：US07991622B2公开日：20110802
专利附图：
摘要：A “STAC Codec” provides lossless audio compression and decompression byprocessing an audio signal using integer-reversible modulated lapped transforms (MLT)
to produce transform coefficients. Transform coefficients are then encoded using abackward-adaptive run-length Golomb-Rice (RLGR) encoder to produce losslesslycompressed audio signals. In additional embodiments, further compression gains areachieved via an inter-block spectral estimation and data sorting strategy. Further,compression in the transform domain allows the bitstream to be partially decoded, usingthe corresponding RLGR decoder, to reconstruct the frequency-domain coefficients.These frequency-domain coefficients are then directly used to speed up varioustransform-domain based applications such as transcoding media to lossy or otherformats, search, identification, visualization, watermarking, etc. In other embodiments,near-lossless compression is achieved by right-shifting transform coefficients by somenumber of bits such that quantization errors are not perceived as distortion in thedecoded audio signal.
申请人：Henrique S. Malvar
地址：Redmond WA US
国籍：US
代理机构：Lyon & Harr, LLP
代理人：Mark A. Watson
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