Re: iPhone, iPad sampling rates
Re: iPhone, iPad sampling rates
- Subject: Re: iPhone, iPad sampling rates
- From: Raphaël - Mancing Dolecules <email@hidden>
- Date: Thu, 12 Aug 2010 01:09:58 +0200
Interesting note indeed.
As third-party apps are
now allowed to run audio in the background, thanks to iOS 4, I would bet
that the behavior you noticed with the iPod app would be reproduced
with some other "audio backgrounding" app. Possibly with different
sample rate than 44.1 kHz, depending on, and if, they have setted their own kAudioSessionProperty_PreferredHardwareSampleRate.
Pandora, Spotify or music creation apps like ThumbJam, which is very likely to use kAudioSessionProperty_PreferredHardwareSampleRate, could be used for testing this.
Regarding the 44.1 kHz of the music player, if it can be something
else, it would probably be the sampling rate of the played file itself.
So feeding your iPod Touch with audio files with various sampling rates
would be a good start point for testing, assuming there is no
resampling/transcoding in the sync process.
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