agc for tv

Discussion in 'The Projects Forum' started by tibbles, Jun 27, 2008.

  1. tibbles

    Thread Starter Active Member

    Jun 27, 2008
    249
    3
    hi all
    had a long standing problem with tv getting really loud during breaks and waking the kids and the neighbours up. so i am thinking of putting an agc in the scart between the satelite box and tv.using the L R audio.
    spotted this circuit http://www.elecdesign.com/Articles/Index.cfm?AD=1&AD=1&AD=1&ArticleID=6272

    would appreciate any thoughts on this, for example this agc circuit is analogue, would i perhaps need digital?

    many thanks
    dougal
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    What do you mean by 'getting very loud during the break' ?

    If you mean the sound is too loud why you dont turn the volume down or mute the tv?
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    That circuit would only work if placed between the volume control and the audio amplifier inside the tv set. It would probably take some fiddling to work correctly.

    AGC circuits are often not very satisfactory with audio. They tend to respond to a continuous level, so you might find that the volume would vary in strange ways.
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    TV commercials are compressed which makes them seem to be too loud. They are not any louder than the TV show but they are compressed so that the average volume is louder than it is supposed to be. The peak volume is the same as the show.

    It takes brains (a computer) to determine that it is a commercial and that it needs de-compression. How much decompression?
     
  5. tibbles

    Thread Starter Active Member

    Jun 27, 2008
    249
    3
    thanks for replies
    just done a google on this -legislation due july 7th.
    dont hold your breath...
    there are however technical problems for the sound engineers, because i watch mainly documentaries late evening,many of these are fairly quiet so the contrast is much greater, also many of these programs were recorded in analogue,and apparently its difficult to set levels
     
  6. loosewire

    AAC Fanatic!

    Apr 25, 2008
    1,584
    435
    What happen to the I f system,with cable .
     
  7. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    I have cable TV. One TV is connected for analog and another TV is connected to a digital adapter.
    They both sound exactly the same except the digital one has its sound delated about 1 second. On both of them the compressed commercials sound louder than the show.
     
  8. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,159
    What is the legislation number?
     
  9. loosewire

    AAC Fanatic!

    Apr 25, 2008
    1,584
    435
    The increased sound come from the station to get your
    attention, they yell into the mike.There one guy with a
    loud mouth speak's for about 10 different product's.
    I get my queit t.v. from book t.v. on C-span you
    will be surprised to hear the back and forth on so many book's
    on weekend only,no ad's ever.
     
    Last edited: Jun 29, 2008
Loading...