Would this work?

Discussion in 'The Projects Forum' started by Pleasedonthitme, Sep 21, 2013.

  1. Pleasedonthitme

    Thread Starter New Member

    Aug 29, 2013
    17
    0
    I spliced together a phono cable into two of the four wires in an audio cable. I then plugged the phono end into the video output of my TV, and the audio jack into the microphone socket on my computer - so I recorded the information in the cable coming from the TV. I tried playing it back (by moving the phono jack to the video input socket and the audio jack into the headphone socket), but it didn't work. When I plugged it into the audio input of my TV I heard some weird noises (so I knew there was a signal leaving my computer).

    Does anyone know whether this could work as a way of recording video (even if I was only storing it on my computer)?
     
  2. #12

    Expert

    Nov 30, 2010
    16,283
    6,795
    Video is such a high frequency that I'm surprised you got anything in the audio range.
     
  3. Pleasedonthitme

    Thread Starter New Member

    Aug 29, 2013
    17
    0
    If I was to use a static image would I be able to replay it on my TV?
     
  4. #12

    Expert

    Nov 30, 2010
    16,283
    6,795
    No. The sweep frequency is the same whether the picture is holding still or not.
     
  5. DickCappels

    Moderator

    Aug 21, 2008
    2,651
    632
    There are components in composite video that are at harmonics of the field rate. Of particular note, the vertical sync pulse is reliably at the field rate (50 Hz or 595.94Hz for broadcast in most places).
     
    #12 likes this.
  6. Ramussons

    Active Member

    May 3, 2013
    557
    92
    The Video (Composite) Out has signals from 50 (60) Hz to 5.75 (4.65) MHz depending on whether it is PAL or NTSC system.
    In either case, the output will be a 1Volt Peak to peak which will overload your microphone input drastically.

    If you intend to record the composite video, you will need an active interface to connect it to the PC.

    Google for Video Capture Units or TV front ends for PC's.
    Ramesh
     
    #12 likes this.
Loading...