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Method and apparatus for preventing overflow and underflow of an encoder buffer in a video compression system

  • US 5,619,341 A
  • Filed: 02/23/1995
  • Issued: 04/08/1997
  • Est. Priority Date: 02/23/1995
  • Status: Expired due to Fees
First Claim
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1. A method for preventing overflow and underflow of an encoder buffer in a video compression system, the method comprising the steps of:

  • a) using a virtual buffer, in a rate controller, to model a decoder buffer fullness;

    b) generating a sequence of bits by an encoder, wherein the encoder is controlled by the rate controller to prevent a decoder buffer underflow and overflow;

    c) receiving the sequence of bits by the encoder buffer to produce a bitstream;

    d) transmitting the bitstream from the encoder buffer to a decoder buffer following a delay to produce a delayed bitstream, wherein the delayed bitstream corresponds to an instantaneous channel bitrate; and

    e) controlling the delay by the rate controller to synchronize an encoder buffer fullness with a virtual buffer fullness, wherein the synchronization prevents overflow and underflow of the encoder buffer,wherein a predetermined encoder buffer size is larger than a predetermined decoder buffer size,wherein the delay is based on the predetermined decoder buffer size, an initial decoder buffer fullness, a predetermined average channel bitrate, and a predetermined frame rate.

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