On Wed, 27 Nov 2002 16:42:27 +0530 (IST)
[EMAIL PROTECTED] wrote:
> Please clarify about stereo playback.
> * Does stereo recording help in speech quality.
No.
> * Does stereo mean output in two speakers and mono mean output in one
> speaker ?
Depends on the playback equipment. It may only output to one speaker,
but it also may play the same on both.
> * When I play a mono wav file in the computer, in both the speakers
> sound is heard. Will it be the same in if played in other cd mp3
> payers including walkman ?
I don't think there's a specification which requires it to play on both
speakers, but I think it is common sense to play it on both. But there
may be a hardware, which plays it just on one speaker.
> There are Philosophy lectures (purely speech no instruments)of 60 min
> duration done with Marantz tape recorder. This is loaded into the
> computer and stored as wav file .
> For 60 min recording it occupies 600 MB hard disk space at 44.1 KHz
> ,16 bit .
> The 600 MB stereo wav files are converted to stereo mp3 files approx
As you are only interested in the content of the speach and not in the
metainformation (position of the speaker on the stage) and I also
assume, that you just use a normal microphone (so you just have mono
input) it is a waste to have the file in stereo (it has no additional
information compared to a mono file).
> 60 MB each. They are finally written to a CD for distribution.
> Softwares used are Audacity,lame and nero.
>
> If I encode to mp3 as mono what will be the loss in quality of output
> to listener ?
I assume that you don't use stereo-microphones so you therefore have
only mono information in the wav file. Encoding it in mono will result
either in a better quality (when you stay with the filesize), or in a
smaller file (when you stay with the quality).
For speech you also can reduce the sampling rate. Instead of 44.1 kHz
you can go down to 32, 22.05, 16 or 11.025 kHz (just try it and use the
settings which sound better). This way you can further reduce the
filesize. But I don't know if those sampling rates are supported by
every equipment, it may be the case that some hardware players aren't
able to play them. So you may want to have more than one mp3 file for a
while until you know that enough players are able to play the smaller
one.
Bye,
Alexander.
--
Where do you think you're going today?
http://www.Leidinger.net Alexander @ Leidinger.net
GPG fingerprint = C518 BC70 E67F 143F BE91 3365 79E2 9C60 B006 3FE7
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