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Octave Bass sound "shape"

Discussion in 'Electronic Repair' started by N Cook, Dec 11, 2007.

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  1. N Cook

    N Cook Guest

    Sound colouration setting on Roland Cube 30
    Would anyone know if this is how the output looks, on an oscilloscope, for a
    regular sine shape waveform from a signal generator as an input
    for various frequencies.
    Because of image capture/strobe problem I've coloured in part of the missing
    60 Hz shape in the top image.
    The missing bits on the 160 Hz image are there but feint
    Above 300 Hz the distortion disappears.
    No distortion for these bass frequencies when any of the other sound shape
    are selected
  2. N Cook

    N Cook Guest

    Looks as though the definition of "Octave bass" is it adds a subharmonic one
    octive below the note in question.

    That looks like the case for the 60 Hz pic. I'll have to try graphing out
    such a situation and see what the resultant is at higher frequencies.
  3. N Cook

    N Cook Guest

    confirmed - graphing out on a pc the sum of 2 sines of differing relative
    amplitude and phase and fixed octave apart produces those shapes
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