> constant. A T-120 VHS tape _always_ holds 120 minutes of analog video and
It depends whether you're in SP, LP, or EP mode. When you're in EP mode,
you get 8 hours. So you don't always get 120 minutes.
I have to agree with everyone else on this list. Converting from analog to
digial and vice versa is not considered compression/decompression. Reducing
the "size" of digital data is considered compression. So the algorithm used
by ZIP is compression (lossless) and the reduction of bit rate of MP3s and
ATRAC are also compression (lossy). I just passed a grad course on digital
communications so I would hope that I know what I'm talking about. If I
goofed, then... please don't tell my prof! :)
> 120 minutes of analog audio, and the speed is constant. In all three
> cases, the media density is constant. Assuming that the 5MB per minute of
> audio figure is accurate for a given media format, I can say with
> certainty
> that 1 minute of analog audio always requires 5MB for that type of media.
The size of analog data is not defined. The space taken up depends entirely
on design. For example, vinyl, you have 33rpm and 45rpm. One spins faster
than the other, but why ? Is a 5min song not a 5min song ?
> Compact Disc with both CD-DA and Laserdisc tracks. And the fact remains:
> CD-DA uses less physical space on the media for the same length of signal.
There is no correlation between physical size and the size req. to represent
a signal. Let's take an example we all know. 80min MDs. They are 80 min
because the gap between tracks are smaller. Even though the data/physical
size is larger for 80min MDs, by your argument they have higher compression
than 74 min MDs which we all know is false because even though the physical
space is the same for both, the bitrate is still the same for both.
WZ
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