Still/slow circuit for a VCR with two heads

Details Still/slow circuit for a VCR with two heads Still/slow circuit for a VCR with two heads

1990-06-28

1991-07-09

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

360 101, 360 103, H04N 979, H04N 578

Patent

active

050310518

ABSTRACT:
A still/slow circuit for use in a two-head type VCR includes a digital counter for counting slow indication signals, a pulse oscillator for outputting slow drive control signals in response to outputs of the digital counter, an envelope detector for integrating playback video signals to detect envelopes therefrom, a differentiator for differentiating head-switching signals to output only positive pulse signals, a sample/hold unit for sampling and holding the output signals of the envelope detector by being triggered with the positive pulse signals of the differentiator, an OR-gate unit which allows still indication signal and slow indicating signal to pass therethrough, a comparing unit for comparing as to whether or not the output signal level of the envelope detector is same as the output signal level of the sample/hold unit and outputting an oscillation drive voltage when they do not coincide with each other, a pulse oscillator for outputting still drive control signals, and a differentiator for differentiating the frame advance indication signals to apply those signals together with the output signals of the sample/hold unit to the comparing unit, whereby the still/slow circuit carries out the still playback, slow playback, and frame advance operations.

REFERENCES:
patent: 4510533 (1985-04-01), Tokuyama
patent: 4772975 (1988-09-01), Azuma

Affiliated with

Also associated with

Rating

Still/slow circuit for a VCR with two heads does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Still/slow circuit for a VCR with two heads, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Still/slow circuit for a VCR with two heads will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-622499