Octave Bass sound "shape"
 

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
http://home.graffiti.net/diverse:graffiti.net/obm.jpg
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
options
are selected

Octave Bass sound "shape"
 

N Cook wrote in message
...
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
http://home.graffiti.net/diverse:graffiti.net/obm.jpg
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
options
are selected





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.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

Octave Bass sound "shape"
 

N Cook wrote in message
...
N Cook wrote in message
...
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
http://home.graffiti.net/diverse:graffiti.net/obm.jpg
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
options
are selected





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.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/




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

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/