About the final accuracy of an FFT applied to note recording sample files, it's
like
if you have a number of waves in you FFT interval, they seldom will wrap around
at sample
boundaries, and certainly if you want an accurate match in your FFT, the FFT
interval
should as closely as possible
Hello all
Is there a synchronous synchronisation to the given power frequency or
does it have slippage like an asynch engine?
If long term synchronous, there certainly is jitter.
Am 02.01.2019 um 02:50 schrieb Ben Bradley:> Even with that, you're
> still not accounting for variations caused
> Thank you Nigel, RB-J, Steffan, and Neil.
>
yer welcome from me.� armchair quarterbacking is pretty easy.
>
>
> i suspect that those tone wheel waveforms are close to sinusoidal.
>>
>
> Early models were. Starting I think around '53 with the B-3, C-3 and A1xx
> series (A100
On 1/4/19 3:22 PM, Frank Sheeran wrote:
> Hey, if you don't want an actual Hammond, that's why I wrote the entire
> soft synth in the first place! :-D
>
> The main reason I'm doing this patch is as a case study showing my soft
> synth can emulate a real Hammond (and Leslie) warts and all, to a
> On 04.01.2019|KW1, at 15:22, Frank Sheeran wrote:
>
> Thank you Nigel, RB-J, Steffan, and Neil.
You’re welcome!
>
>
>
> i suspect that those tone wheel waveforms are close to sinusoidal.
>
> Early models were. Starting I think around '53 with the B-3, C-3 and A1xx
> series (A100
Thank you Nigel, RB-J, Steffan, and Neil.
i suspect that those tone wheel waveforms are close to sinusoidal.
>
Early models were. Starting I think around '53 with the B-3, C-3 and A1xx
series (A100 etc.) they were a bit brighter, and the foot pedals were FAR
brighter.
> but to find out
Robert,
The tonewheels are intended to be perfectly sinusoidal, though their mass
stamping does introduce various differences. The execption is the lowest
octave of certain models, B3 included, made at certain times, as described
here:
http://www.dairiki.org/HammondWiki/ToneWheel
Given the
Frank,
how did you record the signals? If taken from the TWG terminal strip, they
contain also a ton of neighbor frequencies, sub-harmonics, etc. And sometime,
the wheels have a certain flutter lading to some kind of low frequency
modulations, etc. So, if you’re just off by 0.7 cents of, that
> I have a file which contains a second's worth of sound of each of the 91
> tonewheels of a Hammond B-3 organ in order. (Hammonds have spinning disks
> whose edge is fluted in a shape of a desired output sound wave. This spins
> in front of a mechanical pickup, which converts that
> However when run on the Hammond recording, it's detecting a wavelength of
> perhaps 0.7 cent off.
Interesting…I looked at this quickly, not an authority, but power line
frequency regulation (Hammond relying on synchronous motors for pitch, of
course)—in North America for 60 Hz—is adjusted
Evan thanks for the pointers to techniques. I haven't heard of them but
will investigate.
Ben thanks for the links. I actually have reviewed both but they'd have
been critical had I not. Did you note the Utility Frequency page had a
very surprising coincidental mention of Hammond?
Your "detecting a wavelength of perhaps 0.7 cent off" caught my eye,
as the Hammond tone generation is mechanically tied to the 50Hz or
60Hz power frequency, and I don't think the line frequency has ever
been regulated as accurately as 1 cent (1/100th semitone). For
accurate recordings, you'd need
Hello, Frank —
I tentatively ask what the "value under the curve would be" up to this
> zero-crossing. If the value is close enough to zero, then I treat the
> difference between this interpolated crossing and the first as a candidate
> wavelength.
>
If you're doing this, you certainly want to
Summary
I'm having trouble identifying exact frequencies in what should be an
extremely easy-to-process WAV file, as a first step to doing a harmonic
analysis with a Fourier transform.
Details of Project
I have a file which contains a second's worth of sound of each of the 91
tonewheels of
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