Re: [amsat-bb] Time for a USB port in the radio - IEEE 1394

["John Stephensen, KD6OZH" <kd6ozh@xxxxxxx>]

12 Mb/s should be adequate for anything but fast-scan TV. 1 channel of 0-3.3
kHz audio sampled at 8 ksps with 16-bits of resolution is 128 kb/s. 2
channels of 0-40 kHz audio sampled at 96 ksps with 24-bits of resolution is
4.608 Mb/s.

USB version 1.1 is also inexpensive -- 12 Mb/s streaming USB controllers are
$11 and 24-bit 96-ksps stereo audio CODECs are $6 from Texas Instuments in
unit quantities. The USB 2.0 specification was recently released and will
support 480 Mb/s using the same cable.  However, it will probably be much
more expensive for the next few years.

- John Stephensen
  KD6OZH
>
>The issue here is that IEEE 1394 is aimed at completely different range of
>applications like DVD and real time video.
>
>Of course we cannot foresee where radio communications will go (or where we
will >lead them - sorry, my crystal ball is broken ;-)) but I would guess
that 12 Mbps >would be enough for a start (currently, wireless networking
runs maximum >1.2Mbps on 2.4GHz spread spectrum technology).
>
>But then again, why not just aim at the top???
>

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