Re: two questions about FFT/IFFT

Thanks for the reply. This might be a silly question, but is there an
equation I can use to reliably calculate the actual frequency range of each
bin returned by the analyser? I get an array of decibel values but I don't
know exactly what frequencies they correspond to.

Matt

On Tue, Apr 12, 2016 at 7:32 PM, Raymond Toy <rtoy@google.com> wrote:

>
>
> On Tue, Apr 12, 2016 at 2:24 PM, Matt Diamond <mdiamond@jhu.edu> wrote:
>
>> 1) Is it possible to do a non-realtime spectral analysis of a
>> BufferSource using an AnalyserNode with an OfflineAudioContext?
>>
>
> Yes, but you probably need to use suspend/resume to get correct timing.
>
>>
>> 2) Is it possible for me to use a PeriodicWave to convert an array of
>> frequency data from the Analyser Node back into a time-domain waveform? It
>> seems like this isn't possible.
>>
>
> Right.  The analyser loses the phase information so you can't get the
> original back.
>
>>
>> Basically I'd like to come up with a web-based version of the spectral
>> averaging technique that R Luke DuBois employed on Timelapse... averaging
>> the spectral content of an entire buffer and then reproducing that content
>> as a sustained drone. Is that possible yet with the Web Audio API as it
>> currently exists?
>>
>> Thanks,
>> Matt Diamond
>>
>
>