[sdiy] Harmonic bandwidth

[Tom Wiltshire]

There is one source of possible differences between the waveforms,  
which is that they've all been normalized to their maximum level.  
Given that the waveshapes won't have the same maximum peak level,  
this is likely to produce minor level differences between them.

However, they've all got exactly the same 20 harmonics in exactly the  
same proportions.

T.

On 8 Jan 2008, at 10:15, Dave Manley wrote:

> 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.
>>>>
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