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Multi-channel audio decoder    

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United States Patent5974380   
Link to this pagehttp://www.wikipatents.com/5974380.html
Inventor(s)Smyth; Stephen Malcolm (Thousand Oaks, CA), Smyth; Michael Henry (Agoura, CA), Smith; William Paul (Woodland Hills, CA)
AbstractA subband audio coder employs perfect/non-perfect reconstruction filters, predictive/non-predictive subband encoding, transient analysis, and psycho-acoustic/minimum mean-square-error (mmse) bit allocation over time, frequency and the multiple audio channels to encode/decode a data stream to generate high fidelity reconstructed audio. The audio coder windows the multi-channel audio signal such that the frame size, i.e. number of bytes, is constrained to lie in a desired range, and formats the encoded data so that the individual subframes can be played back as they are received thereby reducing latency. Furthermore, the audio coder processes the baseband portion (0-24 kHz) of the audio bandwidth for sampling frequencies of 48 kHz and higher with the same encoding/decoding algorithm so that audio coder architecture is future compatible.
   














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Patent Text Patent PDF Print Page Summary File History
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Inventor     Smyth; Stephen Malcolm (Thousand Oaks, CA) , Smyth; Michael Henry (Agoura, CA) , Smith; William Paul (Woodland Hills, CA)
Owner/Assignee     Digital Theater Systems, Inc. (Agoura Hills, CA)
Patent assignment
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Publication Date     October 26, 1999
Application Number     08/991,533
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     December 16, 1997
US Classification     704/229 704/201 704/500 704/503
Int'l Classification    
Examiner     Hudspeth; David R .
Assistant Examiner     Opsasnick; Michael N.
Attorney/Law Firm     Koppel & Jacobs
Address
Parent Case     RELATED APPLICATION This application is a divisional of application Ser. No. 08/642,254 filed May 2, 1996 entitled MULTI-CHANNEL PREDICTIVE SUBBAND AUDIO CODER USING PSYCHOACOUSTIC ADAPTIVE BIT ALLOCATION IN FREQUENCY, TIME AND OVER THE MULTIPLE CHANNELS, which is hereby incorporated by reference and which is itself a continuation-in-part of provisional application Ser. No. 60/007,896 filed Dec. 1, 1995.
Priority Data    
USPTO Field of Search     704/201 704/229 704/230
Patent Tags     multi-channel audio decoder
   
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