Audio Latency

Laurie

Audio latency Score for iOS and Android
http://superpowered.com/latency/

Vecoto

I just ran it on my Air 2. Worse latency than an iPad 2! Oh dear, Apple.

sonosaurus

If you run it with the built in mic/speaker on recent iOS devices you will see a larger latency due to some silly processing Apple has forced on it. Attach a line output to speakers, or an external USB interface and you'll see a more reasonable result.

Vecoto

Ah, the test won't seem to run on anything but internal mic/speaker on my Air 2, so maybe the results are fairly meaningless. I'm happy with the latency I get when playing synths via midi and running live audio effects on my Air 2, anyway; less happy with the realtime audio glitches that plague various combinations of apps, but maybe that's a separate issue.

Ringleader

I just tested my iPad Air 2 for audio latency using an Apogee ONE for in/out.

Total roundtrip audio latency is 7 ms.
Buffer size is 64.
Sample rate is 48000 Hz.
iOS 8.1.3

Ringleader

I just tested my iPad Air 2 for audio latency using built in mic and speakers.

Total roundtrip audio latency is 13 ms.
Buffer size is 64.
Sample rate is 48000 Hz.
iOS 8.1.3

Vecoto

@Ringleader Did you have to change a setting somewhere to run the test through the Apogee ONE? I use an Alesis iO Dock II, but when my iPad is connected to that, the test still uses the built-in mic and speaker.

Ringleader

@Vecoto - I had to reconnect a few times before it would work. And connect a loop back cable from headphones to input, of course.

Ringleader

I just tested my iPhone 5s for audio latency using built in mic and speakers.

Total roundtrip audio latency is 11 ms.
Buffer size is 64.
Sample rate is 48000 Hz.
iOS 8.1.3

I just tested my iPhone 5s for audio latency using an Apogee ONE for in/out.

Total roundtrip audio latency is 7 ms.
Buffer size is 64.
Sample rate is 48000 Hz.
iOS 8.1.3

Vecoto

Thanks @Ringleader reconnecting my iO Dock II once the test app was loaded did the trick.

I got the same score as you for the Air 2 internal mic/speaker. Interestingly, through the iO Dock II, (with loopback lead) it recorded a latency of 14 ms at 44.1 kHz, so not nearly as good as your Apogee ONE. Still, it feels responsive enough for my use.

Anssi

@sonosaurus: In our app, we observe approx 30 ms longer latency when playing via the built-in speaker as compared to playing through headphones. And that is very likely due to some processing applied on the speaker output as you write.
Is there any way to detect that such a processing is being applied? We'd like to sync things in our app, but that 30ms inconsistency is making things hard since it only seems to exist on some newer iOS devices.

supadom

Tried to install but got a repeated error message while installing. Could it be because I'm on ios7?

Saying that I haven't got much to complain latency wise on my air 1. It sometimes bothers me on my iPhone 5s when I use it for faster guitar riffs.

supadom

Ah ok, IOS8 required.

sonosaurus

@Anssi said:
sonosaurus: In our app, we observe approx 30 ms longer latency when playing via the built-in speaker as compared to playing through headphones. And that is very likely due to some processing applied on the speaker output as you write.
Is there any way to detect that such a processing is being applied? We'd like to sync things in our app, but that 30ms inconsistency is making things hard since it only seems to exist on some newer iOS devices.

Yes, the outputLatency property of the current AVAudioSession will update accordingly depending on the active configuration, and it should tell you what you need to know. Also, the inputLatency property may be relevant to you.