[sdiy] Harmonic bandwidth

[Dave Manley]

Listening with headphones using either Audacity or Media Player, I hear 
slight differences in all three when played sequentially.  The RampRn 
and RamInv have overtones that are not present in Ramp. The added 
overtone(s?) in RampInv are higher pitched than in RampRn.  An analogy - 
there is a common tone to all three, as if playing a low note on an 
organ keyboard, then for RampRn a pure high note is added, and for 
RampInv it changes to a slightly higher pitched note.  For me hearing 
these higher tones is like looking for a dim star in your peripheral 
vision, don't focus on the fundamental. Can anybody else here a 
difference in overtones?


-Dave


Scott Gravenhorst wrote:
> I hear no difference between the three samples on Tom's site...
>
> Ben Lincoln <blincoln at eventualdecline.com> wrote:
>   
>> Wow, thanks Tom.
>>
>> The weird thing is, I can definitely hear a difference between those 
>> three. If I play them sequentially, it sounds similar to playing F-C-F 
>> (with the second F being an octave lower than the first, and the C being 
>> in-between them). It's not quite the same, but that's the closest I can 
>> get to explaining it.
>>
>> Tom Wiltshire wrote:
>>     
>>> Hi both,
>>>
>>> I had a PHP script that spits out AIFF audio (yeah, reallly...), so I 
>>> put together some demos of in-phase, out of phase, and random harmonic 
>>> phase ramp waves;
>>>
>>> http://www.electricdruid.com/Phase.html
>>>
>>> The experiment confirms the theory - three vastly different looking 
>>> waves all sound exactly the same.
>>>
>>> T.
>>>