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Variable rate vocoder    

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United States Patent5414796   
Link to this pagehttp://www.wikipatents.com/5414796.html
Inventor(s)Jacobs; Paul E. (San Diego, CA); Gardner; William R. (San Diego, CA); Lee; Chong U. (San Diego, CA); Gilhousen; Klein S. (San Diego, CA); Lam; S. Katherine (San Diego, CA); Tsai; Ming-Chang (San Diego, CA)
AbstractAn apparatus and method for performing speech signal compression, by variable rate coding of frames of digitized speech samples. The level of speech activity for each frame of digitized speech samples is determined and an output data packet rate is selected from a set of rates based upon the determined level of frame speech activity. A lowest rate of the set of rates corresponds to a detected minimum level of speech activity, such as background noise or pauses in speech, while a highest rate corresponds to a detected maximum level of speech activity, such as active vocalization. Each frame is then coded according to a predetermined coding format for the selected rate wherein each rate has a corresponding number of bits representative of the coded frame. A data packet is provided for each coded frame with each output data packet of a bit rate corresponding to the selected rate.
   














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Patent Text Patent PDF Print Page Summary File History
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Inventor     Jacobs; Paul E. (San Diego, CA); Gardner; William R. (San Diego, CA); Lee; Chong U. (San Diego, CA); Gilhousen; Klein S. (San Diego, CA); Lam; S. Katherine (San Diego, CA); Tsai; Ming-Chang (San Diego, CA)
Owner/Assignee     QUALCOMM Incorporated (San Diego, CA)
Patent assignment
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Company News
Publication Date     May 9, 1995
Application Number     08/004,484
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     January 14, 1993
US Classification     704/221 704/201 704/222 704/224 704/500
Int'l Classification     G10L 003/02
Examiner     MacDonald; Allen R.
Assistant Examiner     Hafiz; Tariq
Attorney/Law Firm     Miller; Russell B. English; Sean ,
Address
Parent Case     This is a Continuation of application Ser. No. 07/713,661, filed Jun. 11, 1991, now abandoned.
Priority Data    
USPTO Field of Search     381/30 381/31 381/30 381/31 381/38 381/30 381/31 381/47 395/2 395/2.1 395/2.3 395/2.31 395/2.33 375/27 375/122
Patent Tags     variable rate vocoder
   
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 U.S. References
 
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5235671
Mazor

Aug,1993
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Fielder
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50% - 74.99%
25% - 49.99%
10 - 24.99%
5 - 9.99%
2 - 4.99%
1 - 1.99%
< 1%
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50% - 74.99%
25% - 49.99%
10 - 24.99%
5 - 9.99%
2 - 4.99%
1 - 1.99%
< 1%
[No votes]
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[0 reasonable royalty comments]
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