| 摘要 |
A method for the DCT coding rate regulation and motion-compensated time prediction of a digital television signal. The current Tn and next Tn+1 frames are subjected to a quantization process (101) with a quantization pitch qn, qn+1 generating a frame rate dn, dn+1, whereafter the method comprises, for each current frame, approximating (102) the law of variation of the coding rate logarithm to a linear function of the quantization pitch logarithm Log(dn) = a - 1/m Log(qn), where a and m are substantially constant test values. The quantization pitch qn of the current frame is adapted (103) to a value qn+1 for the next frame by an adapting coefficient r, qn+1 = r.qn with r = (dn/dc)<m> where dc is a target rate for successively adjusting the rate dn+1 of the next frame to the value of the target rate dc. The method is useful for coding conventional or high-definition digital television signals.
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