best possible GH1(3) audio settings?

J

JackBayer

Well-known member
Hi all,

I just successfully finished testing to disable agc with a hardware disable hack as follows:

- MP3-player with agc disabler sound goes into input1 of my H4N
- Rode NTG-2 goes into input 2
- From H4N via line out/headphone out with a Sescom attenuator cable into Mic-In on my GH1. (The cable has an extra plug-in attached for your headhones)

The H4N is set to record Stereo obviously.
The left channel will carry the to-be-deleted-in-post agc disabler sound and the right channel my to be used NTG2-sound.

The H4N starts outputting even in record-ready mode, so if the GH1 can record fine qualitly I wouldn´t even have to actually record with my H4N.

And it workes smoothly! I now can record sound in-camera. So the question is:

What´s the latest on how high a bitrate etc setting one can glitch-free apply to the firmware?

Thanks alot!
 
JackBayer said:
The left channel will carry the to-be-deleted-in-post agc disabler sound and the right channel my to be used NTG2-sound.
Click to expand...
Have you tested for crosstalk between GH1 audio channels? Even when not audible, it can lower signal-to-noise ratio on the channel you want to keep.
 
I finally got around to looking closely at my audio channels.

Here´s what I did:

I exported my left channel (with the high pitch AGC disabler sound on it) uncompressed to a file. That I loaded into ableton Live onto a track and boosted it up by +24dB:
Totally clean both by hearing and by looking at my completely flat wave form. There were two little spikes on the waveform though. Both were visually very low profile and only one was audible (sounded like I touched the plugs maybe).

Testing my right channel that way doesn´t make really much sense as there is my want-to-keep-audio on it and all I could do was hear if there´s a super highpitch sound embedded as unwanted extra. It isn´t and when nothing was happening in front of my GH1 the waveform is clean besides background noise of course.

So, in summary I am happy to proceed with this approach and now more than ever open to bitrate suggestions on audio hacking.

Thanks!

Edit: Somehow I remembered the hacking possibilities wrong for audio. There´s not really much to do besides upping the bitrate and loose playback immediately, bummer...
 
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