| 摘要 |
<p>Todays consumer video A/D and D/A converters or other digital video processing systems are restricted to 8-bit resolution. The quantizing noise introduced in these systems can result in visible artefacts in gradually shaped areas of an image or can lead in applications based on some critical algorithms to very severe distortions. It is known to use a dither signal for masking contouring or correlation effects by adding a non-correlated noise signal to the video signal prior to A/D conversion. For achieving an increased bit resolution for a given A/D or D/A converter, a special multilevel dither signal in conjunction with multiple oversampling is added to the bandlimited analog input signal which is afterwards converted with a clock rate of n*fs and to the digital input signal, respectively. <IMAGE></p> |
