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iPhone 6s sample rate quality issu… | Apple Developer …
https://developer.apple.com/forums/thread/20677
The iPhone 6s RemoteIO Audio Unit appears to default to a hardware sample rate of 48000 sps. When my app requests a preferred output sample rate of 44100 on an iPhone 6s, the automatic resampling from 48k to 44.1k appears to be low quality and noisy (appears to adds a lot of spectral aliasing). Far more noisy than on any iPhone 6, 5s or earlier ...
Native iPhone audio format - Stack Overflow
https://stackoverflow.com/questions/632718/native-iphone-audio-format
Definitely try using a 44100 Hz sampling rate. With 48000 I see the same function that you posted appearing in the callstacks -- no such function shows up when using 44100. The canonical audio format for Audio Units on the iPhone is non-interleaved 8.24 linear PCM:
16 bit, 48000 Hz - Audio - Linus Tech Tips
https://linustechtips.com/topic/1381689-16-bit-48000-hz/
Depending on how your specific audio chipset works you can see a lot of performance loss trying to turn a 320kbps, 44.1khz 16bit MP3 into a 192khz 24bit output. Don’t move that setting any higher unless you’re listening to things like high resolution flacs at 96-192khz, or DSD/PCM downscaled from 2.8/5.6/11.4mhz.
Freesound - "iPhone Lock .wav" by madic536
https://freesound.org/people/madic536/sounds/537137/
iPhone Lock .wav - mp3 version iPhone Lock .wav - ogg version iPhone Lock .wav - waveform iPhone Lock .wav - spectrogram 19686.3. play / pause stop change display loop toggle measure. -00:19:686. madic536. September 29th, 2020. A iPhone's locking noise. 48000 Hz/ 16bit.
What audio quality is available on newer iPhones? - Ask ...
https://apple.stackexchange.com/questions/276905/what-audio-quality-is-available-on-newer-iphones
TL;DR: It appears the iPhone 6 supports 24-bit audio and 48 kHz playback. So I found a way to empirically test playback. This first screenshot shows a recording of playback over iPhone USB into Quicktime. You can see from the spectrogram that there is data in the 22-24k range, which means that playback is at least 48 kHz.
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