What Type of Oscillator is

Discussion in 'The Projects Forum' started by redlight000, Mar 21, 2010.

  1. redlight000

    Thread Starter Member

    Feb 26, 2010
    66
    2
    Hi all,

    I hear this rising noise on a televison program, & wondered if it can built ? if some of you guys could analyse its waveform on a Scope.. please because I dont have one..

    Could anyone help please..

    to hear it you have to have your speaker volume quite high.. its NOT loud... so hope one can assist me please.

    many thanks
    redlight000
     
  2. redlight000

    Thread Starter Member

    Feb 26, 2010
    66
    2
    Hi All,
    well I uploaded the sound file, thats if this website accepts it!!!

    thanks.

    redlight000
    :eek:
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,535
    What noise is that?

    The easiest way (if you have a sample) is to record it on a specialized chip and play it back with the chip.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Note for post#2 - the sound file is not present. To the OP - please don't split posts that belong in the same thread.
     
  5. rjenkins

    AAC Fanatic!

    Nov 6, 2005
    1,015
    69
    Are you referring to the sound that appears to rise in frequency endlessly?

    For anyone who has not heard it, it's something like an organ chord.
    It slowly rises over an octave, but as it does the high note of the chord fades out and a new low note fades in, giving the effect of it being endless as it repeats through.
    (eg. After each octave rise, it's back to exactly how it started).

    Edit: Found the proper info on this effect:
    http://en.wikipedia.org/wiki/Shepard_tone
     
  6. redlight000

    Thread Starter Member

    Feb 26, 2010
    66
    2
    HI rjenkins,
    "Yes thats right exactly" can it be built?
    many thanks
    redlight
     
  7. redlight000

    Thread Starter Member

    Feb 26, 2010
    66
    2
    Hi beenthere,

    Sorry about that, posting it WRONG..
    redlight.
     
  8. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    I like The Shepard Tone. It is cool and "far out!" (psychedelic). I think it is heard in Pink Floyde's Dark Side of The Moon song.
     
    redlight000 likes this.
  9. redlight000

    Thread Starter Member

    Feb 26, 2010
    66
    2
    Hi Audioguru,
    thanks, what's the "Shepards Tone"?

    all the best from
    redlight000
    :)
     
  10. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    A sample of the "tone" is found in the Wikipedia link about it that was posted. I think it is played with Java on my pc.
     
  11. redlight000

    Thread Starter Member

    Feb 26, 2010
    66
    2
    Hi Audioguru,

    cheers for the reply, you said its sounds like a pink floyd tone, but from which song you said Dark side of the Moon, but dont know which album..

    thanks alot

    redlight000
    :eek:
     
  12. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    Dark side of the Moon is the album
     
  13. redlight000

    Thread Starter Member

    Feb 26, 2010
    66
    2
    Hi Audioguru,

    hey remember that shepard Tone, and you said you played it on you Pc, with Java, can you direct me please on how to listen to it, and the Links please..
    thanks
    redlight000
    :D
     
  14. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The wikipedia link is here: http://en.wikipedia.org/wiki/Shepard_tone .
    The Glissando play window is at the top right side of the fisrt page. Click on "the play tone" arrow and it should play if your pc has the correct software. Its frequencies sound like they are descending. I couldn't find a Shepard Tone that sounds like the frequencies are ascending.
     
  15. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,157
    redlight000 likes this.
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