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Old 4th January 2012
Lives for gear

Originally Posted by AndrewOswald View Post
Title says it all, couldn't find any info in the 7D manual or on this forum, here are my questions:

Is the external mic input mic level or line level?

What is the sample rate / bit depth of the recording?

Is there any sort of built in audio limiter?

Are there any noise issues / audio quality issues?

Sound quality doesn't have to be great but has to be useable. Trying to avoid using an external recording device if possible.

Any / all help greatly appreciated. Thanks! heh

_Andrew Oswald
Input is mic level only. You can make this work by padding down a line level signal (+4) by about 50 db.

A 7D is auto-gain only--you can't change this without a firmware hack.

The sound, like the 5D etc, is like that of a cheap "burrito-cam" camcorder: thin, no headroom, noisy, some distortion.

The audio recorded is not pcm--it is MPEG4 at whatever frame rate you set.
I believe the SR is 44.1 but I haven't checked that in a while.

The main obstacle is the AGC. I have worked with a lot of 7D and 5D audio in post, and if the AGC can be shut off then you have a fighting chance. Otherwise I would advise an external recorder. There are accessory boxes that claim to fool the AGC of a cam like 7D, but they are expensive, bulky, do nothing about the other audio shortcomings of the camera, and add a high-Hz signal to the audio.

phil p
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