Re: Filter response curve
Re: Filter response curve
- Subject: Re: Filter response curve
- From: Richard Dobson <email@hidden>
- Date: Tue, 17 Jan 2017 16:35:43 +0000
The cleanest way is to feed a single "unit impulse" through the filter
and store the output, which is by definition the impulse response
(assuming this is a standard LTI filter). Then take the FFT of the
impulse response to get the transfer function, which is the response
curve you are looking for. The unit impulse is exactly what the name
says - a single sample of full amplitude followed by silence.
Richard Dobson
On 16/01/2017 20:20, Waverly Edwards wrote:
May I ask what ways are there to get the response curve of a filter? My
current method is to pass a white noise source through the filter and
write the output to disk, then read the disk output into Audacity and
plot the output.
This is the only way that I’ve come up which makes sense as I believe
Audacity is using some form of Fourier Transform on the data. I’ve been
looking at the vDSP functions for FFT. This is the direction that I am
headed, using FFT but even though I don’t know any other way, I feel
this must be using a sledgehammer to kill a mosquito.
Any thoughts on this?
Thank you,
W.
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