The circuit on this module takes care of drop-out compensation of the demodulated video signal and of generation of the MTF signal. The drop-out detector circuit measures a negative going drop- out and in case of a drop-out it will give a\u00a0 pulse to switch over the DO switch to have the delayed video as output signal. This will be the case as long as there is drop-out. The drop-out pulses can be blocked by the DO-INH signal. This is necessary to prevent drop-out correction during the data part of the video signal. Drop-out correction is only done with the luminance signal. The luminance signal is fed to the CCD memory part, which takes care of the 64\u03bcs delay (one line-time).<\/p>\n
The DC RESTORER will take care of clamping of the DC-level of the delayed video to the DC-level of the direct video with the aid of the burst key pulses. The MTF signal is also created on this module. This MTF signal is a DC voltage which will vary in value depending on the read-out diameter of the disc. This voltage is used to adapt the frequency response of the HF signal on the HF PROC module (K).<\/p>\n
Overview The circuit on this module takes care of drop-out compensation of the demodulated video signal and of generation of the MTF signal. The drop-out detector circuit measures a negative going drop- out and in case of a drop-out it will give a\u00a0 pulse to switch over the DO switch to have the delayed video as output signal. This will Continue reading L – Video D.O.<\/span>![\"\"](\"https:\/\/www.domesday86.com\/wp-content\/uploads\/2018\/02\/Module-L-Video-DO-Corr-top.jpg\")
<\/a><\/p>\nBottom-view of PCB<\/h2>\n
<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"