US Patent No: 5,657,420

Number of patents in Portfolio can not be more than 2000

Variable rate vocoder

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Abstract

An 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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
QUALCOMM INCORPORATEDSAN DIEGO, CA7516

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gardner, William R San Diego, CA 35 1014
Gilhousen, Klein S Bozeman, MT 82 11527
Jacobs, Paul E La Jolla, CA 117 1831
Lam, S Katherine San Diego, CA 10 812
Lee, Chong U San Diego, CA 103 2618
Tsai, Ming-Chang San Diego, CA 57 928

Cited Art

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Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
QUALCOMM INCORPORATED (10)
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WIAV SOLUTIONS LLC (8)
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MOTOROLA MOBILITY LLC (7)
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