Re: Convolution Audio Unit how to?
Re: Convolution Audio Unit how to?
- Subject: Re: Convolution Audio Unit how to?
- From: Mark Heath <email@hidden>
- Date: Tue, 22 Nov 2011 12:55:30 +1100
On 22/11/2011, at 11:31 AM, Bob Stern wrote:
Mark,
During the initial period until the buffer fills to as many samples
as the length of the FIR filter, can you:
mute the output,
send the unfiltered input to the output, or
output a time-weighted average of the unfiltered input and filter
output, where the time-weighting gives you pure unfiltered input
initially and pure filtered output at the end of the buffer-filling
period
Thanks for the suggestions Bob,
Yes at the very beginning of the sample I'm di a weighted sum.
The problem is getting the overlap between the sample frames that are
passed to the filter. This is what I need help with.
So I am performing this weighting at both ends of the sample buffer
(by default 512 samples but is controllable by the host application up
to 4096 samples).
Even with small windows there is distortion (dependent on the input
signal) and as the window increases in size the distortion increases.
Are there people who write Audio Units on this list? Or is there a
better mailing list for this?
Mark
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