[microsound] registering volume modulation

[Andrew C. Smith]

> Really? I would not be so sure, like, your chin or nose trembling at
> 5Hz doesnt make any sound at all to me, why would it add volume to
> another sound happening at the same time?

I think what we're saying here is that a 15 Hz signal added to a 300
Hz signal will be perceived as a 300 Hz tone with a 15 Hz tremolo
effect. It's not a matter of "hearing" so much as perception.

To look at your original question, though, I would say to experiment
with the voice and especially to look at compression techniques. One
large problem you might run into is how a plosive will often register
as 100%. People on the SC list were talking about this, using weighted
averages over the last few frames to figure it out.

One good technique might be to take an FFT snapshot and just use the
power of the 500-2500 Hz region, since that's where the vowels will
be. I remember this being suggested somewhere, and the person seemed
pleased with the result. Good luck.

Andrew

On Tue, Dec 1, 2009 at 11:53 AM, Info ( Aevox ) <info at aevox.be> wrote:
> slow presure variations (weather changes, low rumble) will are not longer
> percevale as audio (trough the ear). E.g. the tube of Eustachius will open
> to release the pressure difference between the outer and middle ear. If not,
> the tension on the membrane will become to big. (in negative or positive
> sense)
>
> -----Oorspronkelijk bericht-----
> Van: microsound-bounces at or8.net [mailto:microsound-bounces at or8.net] Namens
> Renato Fabbri
> Verzonden: dinsdag 1 december 2009 17:29
> Aan: microsound at microsound.org
> Onderwerp: Re: [microsound] registering volume modulation
>
>> Most people cannot hear frequencies below 20hz, so any harmonic component
>> lower than 20hz is heard as volume change rather than a part of the
> timbre.
>
> Really? I would not be so sure, like, your chin or nose trembling at
> 5Hz doesnt make any sound at all to me, why would it add volume to
> another sound happening at the same time?
>
>>
>> 1/20*1000 gives 50 --- 50 ms or longer chunks should probably work. RMS
>> will tell you more about the sound's perceived amplitude than peak will.
>> For extra credit you could do an fft and figure out the sone level for
>> the sound (the sone scale is weighted for human perceptual nonlinearities
> -
>> the frequencies that we hear best add more to the score).
>> _______________________________________________
>> microsound mailing list
>> microsound at microsound.org
>> http://or8.net/mailman/listinfo/microsound
>>
> _______________________________________________
> microsound mailing list
> microsound at microsound.org
> http://or8.net/mailman/listinfo/microsound
>
> _______________________________________________
> microsound mailing list
> microsound at microsound.org
> http://or8.net/mailman/listinfo/microsound
>