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Measurement Mode
Hey guys, trying to figure out what this is. I have seen it in Fiddlicator and also in AUM. All I have seen is that it actually does is lower the output from the signal chain.
Does anyone have an accurate description of what Measurement Mode actually does?
Comments
Great question. A definitive explanation would be most welcome.
It disables audio signal processing that iOS does to audio output by default. I believe it is some type of compression to boost the signal. Devs have stated it actually requires enough processing that it can make a difference if you turn it off.
But yeah, weak signal if you do turn it off.
hey i dont mind the weak signal in headphones if it is the true signal. I have a hard enough time getting my tones right only to have the OS add its own boost and compression. I can boost through the mixer or FX return to get the signal louder.
I'm confused. In the AUM settings it has "High Quality" in bold white letters, underneath it has "measurement mode" in small grey letters, and next to these an on/off button. What is on, and what is off? i obviously want the highest possible audio that the developer intended, not what apple has added on top. Should i have this ON or OFF?
Also, does either setting make any difference when going out through a lightening cable to a PC DAW via Studiomux?
I'm curious about the AUM stuff too. I'm on iPhone 7 so only lightning. When I use the headphone adapter it's still digital right? So it would still be processed by the iOS "Extras". When I turn on measurement mode the level drops significantly but I think that might be taking out iOS compression
Measurement mode only has an effect when the internal mic (or mic plugged in the headphone jack) and/or speakers are being used. It bypasses some of the filtering and auto-gain processing iOS applies to the built in hardware. It doesn’t apply if any external audio interface is used, nor do I believe does it affect headphone/line out use (but they may have changed things, so it deserves further study).
Measurement mode turns off a 200hz high pass filter and auto gain processing on the ios internal mic.
do you think that iOS interprets the headphone adapter differently than if an audio interface was plugged in?
im using some di tracks and cans to test some things using the adapter. The signal drops in measurement mode this way. Perhaps if I test with the audio interface connected it will have different results.
also, im trying to set smaple rates to match on all the apps that i am using. Sometimes I try to pick 44.1 but when i do it stays in 48. so not sure if there is something wrong or what
Just tested with Patterning hosted in AUM, output to Studiomux, into Ableton 10 via lightening cable, no discernible difference in my monitors with it "ON" or "OFF".
@sonosaurus That is a better explanation than mine.
I do notice the difference in volume when using the headphone out to some powered speakers, when I turn on measurement mode in AUM or Audiobus too.
Confused again now!
This will do for me........thanks for that..........
thanks, didn't know that. I mostly use external audio interfaces, and I always switched Measurement Mode off - if I was aware of the setting. Often I discovered it much later. But as you say it didn't matter at all. And without external interface it's actually a good thing. So in this case if one uses external interfaces, or even headphones, and sometimes only the naked iPad/Phone, one should leave Measurement Mode on.
I don't think you can just access it in settings, I think it's app specific. I love it in Audioshare when I have to record a rehearsal or something and I don't have my ios mic with me - plus Audioshare let's you turn down the gain on the mic, so no distortion.
But as far as I know, measurement mode has nothing at all to do with output, just input.
When built in speakers are used - no headphone or external audio interface - it turns on/off internal processing (compression), hence the drop in output volume. Also turning off this internal processing will reduce round trip latency.
Ah, gotcha.
If you're running thru the speakers of an iPhone 6/6s plus for it'll switch to 48. For some reason apple thought that people wanted it instead 44.1. Very silly in my opinion and sometimes it causes issue because apps were designed to mostly run in 44.1. If you plug in headphones/external speakers and dont use the phone's speakers it will correct this issue and you can use any sampling rate