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units on y axis, record sound meter, previously recorded

 
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ShariEllen



Joined: 18 Nov 2003
Posts: 1
Location: NYC

PostPosted: Wed Nov 19, 2003 12:05 am    Post subject: units on y axis, record sound meter, previously recorded Reply with quote

I am a new user, student in speech sciences.

In the sound wave window, the y axis does not tell what the units are (after removing DC offset, for example, y axis may read 3517 at top and -3702 at bottom). Would these be micropascals or what

When making a recording directly into wavesurfer, I do not see a VU meter as I record. When I play the sound back, I get the nice red bar at the bottom. Any way to have this on as I record, or as I set my levels? Rather than normalize after the fact.

When opening a sound previously recorded, such as an MP3 or a wav I recorded with Sound Forge, does the software automatically set levels? Or will the Mp3 be distorted?

Thanks for any help on this. Obviously, I couldn't find these answers in the documentation.
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kare



Joined: 16 Aug 2002
Posts: 371
Location: KTH, Centre for Speech Technology

PostPosted: Thu Nov 27, 2003 10:55 am    Post subject: Reply with quote

The unit is [V] since the recorded sound is an electrical signal fed to the sound card, but then again it will be proportional to the sound pressure level.

I'll look into turning the "red bar" on during recording.

WaveSurfer does nothing to the sound file during loading, you would have to use Transform | Normalize explicitly.

If you have any examples of a distorted MP3 please make a copy availabe for download, it's probably a bug. But also make sure the file is ok with other software first.

WaveSurfer is mainly used for visualization of speech, e.g. recording could be used by students to acquire a few seconds of their own speech in a lab situation. They would display a spectrogram during recording, but they would probably not be interested in a VU meter. Which explains why this feature is currently missing. But there is naturally no reason not to make WaveSurfer work more as "expected" compared with other more general sound editing software.

Kåre
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