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Patent US7240001 - Quality improvement techniques in an audio encoder - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn audio encoder implements multi-channel coding decision, band truncation, multi-channel rematrixing, and header reduction techniques to improve quality and coding efficiency. In the multi-channel coding decision technique, the audio encoder dynamically selects between joint and independent coding of...http://www.google.com/patents/US7240001?utm_source=gb-gplus-sharePatent US7240001 - Quality improvement techniques in an audio encoderAdvanced Patent SearchPublication numberUS7240001 B2Publication typeGrantApplication numberUS 10/016,918Publication dateJul 3, 2007Filing dateDec 14, 2001Priority dateDec 14, 2001Fee statusPaidAlso published asUS7917369, US8554569, US20030115041, US20070185706, US20090326962, US20140039884Publication number016918, 10016918, US 7240001 B2, US 7240001B2, US-B2-7240001, US7240001 B2, US7240001B2InventorsWei-ge Chen, Naveen Thumpudi, Ming-Chieh LeeOriginal AssigneeMicrosoft CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (49), Non-Patent Citations (76), Referenced by (27), Classifications (8), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetQuality improvement techniques in an audio encoderUS 7240001 B2Abstract An audio encoder implements multi-channel coding decision, band truncation, multi-channel rematrixing, and header reduction techniques to improve quality and coding efficiency. In the multi-channel coding decision technique, the audio encoder dynamically selects between joint and independent coding of a multi-channel audio signal via an open-loop decision based upon (a) energy separation between the coding channels, and (b) the disparity between excitation patterns of the separate input channels. In the band truncation technique, the audio encoder performs open-loop band truncation at a cut-off frequency based on a target perceptual quality measure. In multi-channel rematrixing technique, the audio encoder suppresses certain coefficients of a difference channel by scaling according to a scale factor, which is based on current average levels of perceptual quality, current rate control buffer fullness, coding mode, and the amount of channel separation in the source. In the header reduction technique, the audio encoder selectively modifies the quantization step size of zeroed quantization bands so as to encode in fewer frame header bits.
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