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Video signal coding with proportionally integrating quantization control

  • US 5,606,371 A
  • Filed: 11/29/1994
  • Issued: 02/25/1997
  • Est. Priority Date: 11/30/1993
  • Status: Expired due to Fees
First Claim
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1. A device for encoding a video signal, comprising:

  • means for dividing each of a plurality of pictures into a plurality of sub-pictures;

    an encoder comprising a picture transformer for transforming each sub-picture into coefficients, and a quantizer for quantizing the coefficients with an applied step size;

    control means for controlling the step size in response to a control signal which is representative of the difference between a target value for the number of bits to be produced by the encoder and the number of bits produced by the encoder, the control means including a proportionally integrating control circuit having a proportional control branch having a first control factor for determining a first fraction of the step size and an integrating control branch having a second control factor for determining a second fraction of the step size;

    at least one of said first and second control factors being controlled in proportion to the quotient of the average step size with which a plurality of sub-pictures is quantized and the number of bits produced by the encoder for said plurality of sub-pictures.

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