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Magic Lantern Forum

Developing Magic Lantern => Feature Requests => Topic started by: Rush on March 01, 2013, 12:39:01 PM

Title: 600D audio in arrow shortcuts - increase Mic boost first, then Analog gain
Post by: Rush on March 01, 2013, 12:39:01 PM
600D analog audio gain can be controlled by two values - Mic boost and Analog gain.
I read that Mic boost is better that Analog gain in terms of quality.

In current version of ML arrow shortcuts control Analog gain value only.
It will be much more usefull to control both Analog gain and Mic boost.

Possible values:
- Analog gain -12, -3, 0, +6, +15, +24, +33, +35
- Mic boost 0, +5, +10, +15, +20, +25, +30

So, from lowest gain to highest, it will switch like that:

BTW, negative analog gain is completely useless (on 600D at least) - http://www.magiclantern.fm/forum/index.php?topic=4722
Title: Re: 600D audio in arrow shortcuts - increase Mic boost first, then Analog gain
Post by: 1% on March 01, 2013, 04:15:29 PM
Except that not all sources need mic boost. Only directly plugged in external mics and passive pre-amps. Anything powered won't be using mic boost.
Title: Re: 600D audio in arrow shortcuts - increase Mic boost first, then Analog gain
Post by: Rush on March 01, 2013, 04:30:46 PM
Quote from: 1% on March 01, 2013, 04:15:29 PM
Except that not all sources need mic boost. Only directly plugged in external mics and passive pre-amps. Anything powered won't be using mic boost.
What you mean by "Anything powered"? I have Rode Videomic Pro which is powered by 9V battery and have internal pre-amp, but it can gain by Mic boost.
Title: Re: 600D audio in arrow shortcuts - increase Mic boost first, then Analog gain
Post by: 1% on March 01, 2013, 04:37:14 PM
I feed audio from a wall powered pre-amp and the mics go into that. 0 mic boost works, any mic boost and source is too hot.
Title: Re: 600D audio in arrow shortcuts - increase Mic boost first, then Analog gain
Post by: Rush on March 01, 2013, 04:43:51 PM
Quote from: 1% on March 01, 2013, 04:37:14 PM
I feed audio from a wall powered pre-amp and the mics go into that. 0 mic boost works, any mic boost and source is too hot.
Wow... So Mic boost can damage or break audio source? Don't feel any heat difference with my Rode mic.
Title: Re: 600D audio in arrow shortcuts - increase Mic boost first, then Analog gain
Post by: Francis on March 01, 2013, 04:54:00 PM
Hot means loud. Too hot means too much gain.
Title: Re: 600D audio in arrow shortcuts - increase Mic boost first, then Analog gain
Post by: Rush on March 01, 2013, 05:02:09 PM
QuoteAnything powered won't be using mic boost.

And won't be using "Analog gain" too...
But why you mention it? Most of us record sound from Mics and need fast control of audio gain in-camera. My suggestion sets goal on implementing it.
Title: Re: 600D audio in arrow shortcuts - increase Mic boost first, then Analog gain
Post by: a1ex on March 01, 2013, 05:06:13 PM
Isn't A+15 the same as M+15?
Title: Re: 600D audio in arrow shortcuts - increase Mic boost first, then Analog gain
Post by: Rush on March 01, 2013, 05:09:57 PM
Quote from: a1ex on March 01, 2013, 05:06:13 PM
Isn't A+15 the same as M+15?
If they both enabled, it will be +30db total
Title: Re: 600D audio in arrow shortcuts - increase Mic boost first, then Analog gain
Post by: 1% on March 01, 2013, 05:18:56 PM
Analog gain is just gain. Mic boost I think ups the power on top of gain like on other crappy codecs... ie windows.
Title: Re: 600D audio in arrow shortcuts - increase Mic boost first, then Analog gain
Post by: Rush on April 25, 2013, 03:30:29 PM
If it's hard to control both analog gains with one shortcut, can I ask you to control "Mic boost" instead of "Analog gain" with arrow shortcuts? It is preferred way to increase analog gain for 600D because of lower noise floor compared to "Analog gain".
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