Cavemandude
Well-known member
Ok, I've been testing out how to get a clean audio signal from the Line Out of the Sony PCM-M10 audio recorder to the GH1 Mic Input while shooting.
Here are the test results and setup. I connected a Shure SM58 handheld mic to the Sony PCM-M10 Mic Input. After much testing, I ended up having to attenuate the Line Out of the Sony M10 by 70dB, that's Seven Zero, going into the GH1's Mic Input so that it wouldn't hit the GH1's audio limiter and reduce/alter the sound quality. The room had background noise from 2 computers, a fan and a central AC was on and blowing from above. This made easier to check for any rise in background noise between words and any difference in overall background noise between the GH1 and PCM-M10.
The audio levels were not changed in either WAV file, they are at their original levels. Coincidently, the Sony PCM-M10 audio ended up being only a couple dB's louder than the GH1's audio so if you want to do a better comparison load the audio files into your audio/video editor and raise the GH1 audio by a couple dB's to even them out and then compare.
Panasonic GH1 audio from original MTS file. I put the MTS file in the timeline of Edius and exported it as a 16bit 48K WAV file:
http://dl.dropbox.com/u/2204694/Panasonic_GH1_audio.wav (11MB)
Sony PCM-M10 audio from original WAV file. Simply copied the 16bit 48K WAV file off the recorder's built-in memory. Here it is:
http://dl.dropbox.com/u/2204694/Sony_PCM-M10_audio.wav (11MB)
I'd say after comparing them myself that it's pretty close considering the GH1 audio file was recorded at 192Kbps 48K AC-3 compared to the uncompressed 48K WAV recorded with the Sony PCM-M10. The GH1 audio is certainly usable for an initial edit without having to sync all the audio from the Sony recorder to the GH1 video and should provide a much more accurate sync once you do that since the audio waveforms will line up perfectly.
Let me know what you think,
Randy
Here is an audio waveform comparison screen grab
Here are the test results and setup. I connected a Shure SM58 handheld mic to the Sony PCM-M10 Mic Input. After much testing, I ended up having to attenuate the Line Out of the Sony M10 by 70dB, that's Seven Zero, going into the GH1's Mic Input so that it wouldn't hit the GH1's audio limiter and reduce/alter the sound quality. The room had background noise from 2 computers, a fan and a central AC was on and blowing from above. This made easier to check for any rise in background noise between words and any difference in overall background noise between the GH1 and PCM-M10.
The audio levels were not changed in either WAV file, they are at their original levels. Coincidently, the Sony PCM-M10 audio ended up being only a couple dB's louder than the GH1's audio so if you want to do a better comparison load the audio files into your audio/video editor and raise the GH1 audio by a couple dB's to even them out and then compare.
Panasonic GH1 audio from original MTS file. I put the MTS file in the timeline of Edius and exported it as a 16bit 48K WAV file:
http://dl.dropbox.com/u/2204694/Panasonic_GH1_audio.wav (11MB)
Sony PCM-M10 audio from original WAV file. Simply copied the 16bit 48K WAV file off the recorder's built-in memory. Here it is:
http://dl.dropbox.com/u/2204694/Sony_PCM-M10_audio.wav (11MB)
I'd say after comparing them myself that it's pretty close considering the GH1 audio file was recorded at 192Kbps 48K AC-3 compared to the uncompressed 48K WAV recorded with the Sony PCM-M10. The GH1 audio is certainly usable for an initial edit without having to sync all the audio from the Sony recorder to the GH1 video and should provide a much more accurate sync once you do that since the audio waveforms will line up perfectly.
Let me know what you think,
Randy
Here is an audio waveform comparison screen grab
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