| 摘要 |
<p>A method for clamping the black level of a television signal comprises converting the input video signal to a digital input signal and, by means of a measuring circuit (10), measuring the signal level during a blanking period of the input video signal. The measured signal level is compared with a digital reference level to generate a digital error signal. A correction signal derived from the error signal at correction generator (14) is added to the samples forming the digital input signal with any residue of the truncated addition at each sample being retained for addition with the correction signal to the next sample.</p> |
