Mic hardware flaw on iPhone 4?
Mic hardware flaw on iPhone 4?
- Subject: Mic hardware flaw on iPhone 4?
- From: "Paul Nettle" <email@hidden>
- Date: Thu, 15 Jul 2010 15:52:48 -0500
I've been working with another developer (Andrew Smith from Studio Six
Digital who created a suite of nice audio analysis apps) and we're seeing
results that look like there is an under-powered mic on the iPhone 4. Below
is a test that you can run on almost any audio recording software, including
aurioTouch.
The test: load up your favorite audio recording software (an SPL graph or
something that allows you to view the waveform later would be best.) Setup a
tone generator - the amplitude of the sound should be roughly 1/3rd or half
of what the mic is capable of capturing without clipping. Start a recording,
wait 5 seconds and clap your hands once. Wait another 20 seconds, then stop
the recording.
Results using a tone generator:
http://www.paulnettle.com/spl.png clapping hands, created by
Andrew Smith from Studio Six Digital
http://www.paulnettle.com/waveform.png finger snap, created by
myself
Even though aurioTouch doesn't allow you to examine audio after-the-fact,
you can still see this same effect as it happens in real-time (it's just not
as obvious.)
If you repeat the experiment using the inline mic built into the earbuds (or
a thumbtack mic) the audio levels remain constant as they should.
- Paul Nettle
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