low-pass filter on the iphone
low-pass filter on the iphone
- Subject: low-pass filter on the iphone
- From: Daniel Birns <email@hidden>
- Date: Thu, 4 Dec 2008 10:23:41 -0800
I'm a newbie to dsp. I need to do some simple dsp to improve voice
recording on the iphone. I currently have some simple processing
working reasonably well, but I'd really like to improve the quality of
the result.
Questions:
1) The mac provides many audiounits that I could use. Is there any
dsp provided for iPhone developers, or must I code this myself?
2) Currently I'm using AudioQueue and doing my processing in the
player callback. My current processing is very simple -- I look for
peaks, and shift as necessary to amplify the sound. I realize that
audiounits is the preferred method for this, but since I don't mind
some delay in the start of the playback, I wonder if I should simply
continue like this, since it's simpler.
3) What algorithms are recommended for voice, particularly recording
lecturers at some distance from the mic? Compression, low-pass
filter, amplification?
4) Assuming I have to write my own, can anyone direct me to sample
code that implements something that would work well on the iphone?
Thanks.
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