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Patent US7917369 - 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/US7917369?utm_source=gb-gplus-sharePatent US7917369 - Quality improvement techniques in an audio encoderAdvanced Patent SearchPublication numberUS7917369 B2Publication typeGrantApplication numberUS 11/737,072Publication dateMar 29, 2011Filing dateApr 18, 2007Priority dateDec 14, 2001Fee statusPaidAlso published asUS7240001, US8554569, US8805696, US20030115041, US20070185706, US20090326962, US20140039884, US20140316788Publication number11737072, 737072, US 7917369 B2, US 7917369B2, US-B2-7917369, US7917369 B2, US7917369B2InventorsWei-ge Chen, Naveen Thumpudi, Ming-Chieh LeeOriginal AssigneeMicrosoft CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (113), Non-Patent Citations (122), Referenced by (6), Classifications (13), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetQuality improvement techniques in an audio encoder
This application is a continuation of U.S. patent application Ser. No. 10/016,918, entitled, �QUALITY IMPROVEMENT TECHNIQUES IN AN AUDIO ENCODER,� filed Dec. 14, 2001 now U.S. Pat. No. 7,240,001, the disclosure of which is hereby incorporated by reference in its entirety. The following U.S. patent applications relate to the present application: U.S. patent application Ser. No. 10/017,694, entitled, �QUALITY AND RATE CONTROL STRATEGY FOR DIGITAL AUDIO,� filed Dec. 14, 2001, now U.S. Pat. No. 7,027,982, the disclosure of which is hereby incorporated by reference; U.S. patent application Ser. No. 10/017,861, entitled, �TECHNIQUES FOR MEASUREMENT OF PERCEPTUAL AUDIO QUALITY,� filed Dec. 14, 2001, now U.S. Pat. No. 7,146,313, the disclosure of which is hereby incorporated by reference; U.S. patent application Ser. No. 10/017,702, entitled, �QUANTIZATION MATRICES FOR DIGITAL AUDIO,� filed Dec. 14, 2001, now U.S. Pat. No. 6,934,677, the disclosure of which is hereby incorporated by reference; and U.S. patent application Ser. No. 10/020,708, entitled, �ADAPTIVE WINDOW-SIZE SELECTION IN TRANSFORM CODING,� filed Dec. 14, 2001, now U.S. Pat. No. 7,460,993, the disclosure of which is hereby incorporated by reference.
NER Expected = ∑ b W [ b ] ( E ~ [ b ] ) 2 β E [ b ] ( 10 ) where {tilde over (E)}[b] is the aggregate excitation pattern of the input channels at critical band b, E[b] is the excitation pattern of channel c at critical band b, and W[b] is the weighting used in the NER computation described below in the section entitled, �Measuring Audio Quality.� In one implementation, based on experimentation, β=0.25. Alternatively, other calculations measuring disparity in the excitation patterns of the input channels can be used.
E [ b ] = ∑ k ∈ B [ b ] Y 2 [ k ] , ( 23 ) where B[b] is a set of coefficient indices that represent frequencies within critical band b. For example, if the critical band b spans the frequency range [�l, �h), the set B[b] can be given as:
So, if the sampling rate is 44.1 kHz and the maximum sub-frame size is 4096 samples, the coefficient indices 38 through 47 (of 0 to 2047) fall within a critical band that runs from 400 up to but not including 510. The frequency ranges [�l, �h) for the critical bands are implementation-dependent, and numerous options are well known. For example, see ITU-R BS 1387, the MP3 standard, or references mentioned therein.
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