Convolution with large filters?
Convolution with large filters?
- Subject: Convolution with large filters?
- From: Michael Tyson <email@hidden>
- Date: Sat, 11 Feb 2012 20:38:08 +0100
Hello!
I'm putting together a convolution audio filter using Accelerate's vDSP_conv, and I'm wondering about what practical filter limits I should be expecting?
I'd like to use it with arbitrary impulse responses (for example, I'm testing with a lovely, echoey hall impulse response, which is about 2 seconds in length).
I've noticed that filters with more than about 16k frames (0.4s) seem to overwhelm the system, causing jittering.
< 0.4s filters are perfectly adequate for things like lowpass filtering, but for nice resonance/natural decay effects, it's way too short.
So, I'm wondering - is there a more appropriate way to use these reasonably long impulse response filters? How does professional sound engineering software handle this kind of thing?
Am I dreaming, and do I just need to limit filters to 16k?
Many thanks,
Michael
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