how much CD quality sound for a mono track recording can fit onto a full sized CD?
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Question
Compressing an MP3, created by Audacity
I have original spoken dialog in Audacity format, recorded with the following settings. But I'd like it to compress to the smallest MP3 posssible.
I have been advised to use Windows Media Encoder, but do not know how to get it back to MP3. (I do not have iTunes)
Here are the settings of Audacity. How can I edit existing tracks? Then what do I use to shrink the MP3?
thanks,
newbieweb
Playback:
Device Microsoft Sound Mapper - Output
Recording:
Device Microsoft Sound Mapper - Input
Channels - 1 (Mono)
OGG Export Setup
OGG Quality: 5
Bit Rate of 128 (LAME v3.97)
Default Sample Rate of 44100 Hz
Default Sample Format 32-bit float
Real-time sample rate converter: Fast Sinc Interpolation
High-quality sample rate converter: High-quality Sinc Interpolation
Real-time diether: none
High-quality dither: Triangle
FFT Size
256 - default
Max Frequency 8000
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Answers
Hi newbieweb,
There are 2 important types of CDs that you can burn.
Audio CDs (playable in old and new CD players)
MP3 CDs (play in CD players with the MP3 logo and on your computer)
An Audio CD can only hold 74 or 80 minutes of audio.
An MP3 CD can hold MP3s and it goes by file size, rather than length of audio. Instead of 80 minutes, it holds, 700 Megabytes (MB) of music. The MP3 quality will determine how much audio will fit. In practice, it usually is 10 times more, ie: 800 minutes. The number of tracks will be dependent on how large the tracks are.
Good luck!
CD quality is a reference for music because music is quite reliant on delivering a high 'dynamic range' -- dynamic range is the spectrum that covers audio from a whisper to the threshhold of pain -- or from a single violin to a full orchestra (with cannons if you want to take Tchaikovsky's 1812 Overture) -- so that needs a high sampling rate that takes up memory in a digital file. But speech doesn't need anywhere near that. So you should experiment with changing the kbps until the audibility is accectable to you.
A lot of CD players, including portables and car stereo players also play wma files these days, as well as your PC.
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by: fredshovelPosted on 2007-09-03 at 15:24:57ID: 19822350
The bit rate of 128Kbps <Bit Rate of 128 (LAME v3.97)> is CD quality.
In Audacity if you go to EDIT / PREFERENCES / FILE FORMATS / MP3 EXPORT SET UP
Then you can select the kbps right down to 16kbps.
Then you re save your file as an MP3 and it will save as the selected rate.