On Sun, 26 Mar 2000, Paul Sack <[EMAIL PROTECTED]> wrote:
> CD quality audio = 44100 samples/sec * 16 bits/sample = 705.6kbps That's
> how it's possible. (If you record from your sound card in cd quality
> format that is what you will get.)
Multiply by two for stereo. It's 16 bits/sample/channel.
So a 20 second wave recorded at 44.1 KHz, 16-bit stereo would be:
44100 KHz *
16 bits/sample/channel *
2 channels /
8 bits/byte *
20 seconds = 3,528,000 bytes
> most mp3's are encoded at 128kbps, some at 160, few at other bit rates.)
The compression is lossy so for really high frequency sounds or low
frequency sounds, a higher bitrate is better, or else it sounds like crap
:) It also depends on the quality of the compression algorithm.
> 24kbps should be fine for voice.
nod... unless the quality of the original recording is crappy, 24 kbps is
fine (in fact, it's denoted as "telephone-quality".) Recording something
off of tape then encoding it at 160 kbps is a bit overkill if it's just
a conversation or lecture.. that defeats the purpose of mp3 compression.
My suggestion is: record from the tape recorder to the LINE-IN on your
sound card (not mic in, you will get too much distortion from the
unnecessary amplification), set your recording settings to 16000 or 22050
Hz, 8-bit mono, and record away. Then compress the wave file at a bitrate
of 24 kbps. I've done this many times from recording lectures and it
works for me, but increase/decrease the numbers as necessary for desired
sound quality.
Good luck!
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