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Old Sep 21, 2006, 8:37 AM   #1
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When one opens a Casio Movie file in Sony Vegas Movie Studio, it says that the sound is encoded in "IMA ADPCM."

Iam not sure what that is but it isNOT one of the formats that Audacity, the free sound editor thatI use, can cope with.

It may be possible to"Solo" (exclamation mark button on the right) the audio track, render itas ogg or mp3 from the file>render menu and thenedit in Audacity and then reimport anddelete the old IMA ADPCM sound. But that sounds like a lot of work to do something that should be simple.

What do youuse to edit the sound in Casio audio, e.g. to add a filter (I want to remove a high pitched whine, that some of you will know theorigin of).

Googling I find...


Fxeditor seems to be cheaper and adequate for my purposes at 40 USD.
http://fxaudioeditor.com/series_4_order.htm
Goldwave may well deal with ADPCM too at 50 CAD.
http://goldwave.ca/forums/viewtopic.php?t=420
Sound Forge Audio Studio at 70 USD
http://www.sonymediasoftware.com/pro...orgefamily.asp

Tim
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Old Sep 22, 2006, 1:57 PM   #2
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Do You mean that Your videos are pre 1.01 FW (made available before Oct 2005)? Then You certainly need a notch filter capable audio editing (the exact frequency was determined by Bart Hickman at dpreview.com Casio forum). And this IMA ADPCM is very standard Intel audio codec supported by all computing systems IMHO- so look for some upgrades/patches for Your software- because I personally do not have any problem with my Z750 movie editing starting from purchase (April 2005)- but the workflow is very different (and up to my taste...)

Best and happy searching/editing, JR

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Old Sep 22, 2006, 8:42 PM   #3
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I can't remember when I purchased my Casion Exilim p505 but I think that it may have been about October last year. What is the significance of the pre 1.01 F? Is it that the audio format was different? Or was it that cameras of this erawere prone to audio interference? I will try and find the frequency you mention on the other forums and post it backhere.

The reason I have sound interference is because I butcher the microphones of my cameras, in order to attach an externam microphone. But I suspect that the interference may be of the same frequency and It would be great to know what it is so that I can use a notch filter and knoch out only that frequency.

I now know that ADPCM is common but, all the same it is not supported by the free audacity or the free version of Wavepad, or even "asia audio editor" (which took me a long time to find) and I am not aware of a free editor that can handle it. All the editors above can handly ADPCM however, and Goldwave removes the whine effectively with its noise reduction tool.

The noise reduction tool on Goldwave, like that of audacity, allows one to sample a section containing only noise (e.g. in a pause between speech) by copying it to the clipboard and using that. The noise reduction on the Sony editor however, seems (not sure) to be automatic and results in disortion of the speech too.

Tim

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Old Sep 25, 2006, 6:30 AM   #4
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Thanks Reps, I found the threads

This one describes the whine frequency 7522 Hz and points out that Vegas is the only NLE that includes a notch filter (great, I am getting into Vegas).

http://forums.dpreview.com/forums/re...ssage=20181199
And these threads detail the fact that Casio fixed the whine in a firmware update, while not admitting that they had dones so, using a firmware notch filter for the above frequency (which comes from the LCD apparently).
http://forums.dpreview.com/forums/re...993&page=2
http://forums.dpreview.com/forums/re...ilter&qf=m

Looking at Casio's site, I see that there was also a firmware update for the p505. There is a chance that they put the notch filter in the 505 firmware update too, but then again they may not have since the only people with noticing the wine are those with the microphone wires snipped and running along the back of the camera.

Anyway, Vegas (full version alas) has the technology to remove it. So rather than purchasing Movie Studio Platinum plus Goldwave, I think that I will use the full version of Vegas.

Tim


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