?? requirements.htm
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<H2><A NAME="requirements"></A>Hardware and software requirements</H2>
In order to use <i>Speak Freely</i>, you need a personal computer with the
following hardware and software:
<p>
<ul>
<li> Microsoft Windows 95/98/Me or NT 3.51/2000/XP or later
<li> Sound input/output card with Windows Multimedia driver
<li> Microphone and speaker(s) compatible with sound card
<li> Network interface with TCP/IP WINSOCK driver
</ul>
<p>
Sending real-time audio over a data network is demanding on every component in
the chain, and the performance required of your computer and network interact
in complicated ways. For example, if you're communicating exclusively with
other people over a high-speed local network and you aren't worried about
eavesdropping, you don't need to enable either compression or encryption, both
of which require a great deal of computation. For such an application a 386
machine is perfectly adequate. If your network link is slower, you'll have to
compress the sound before it's transmitted. The most effective form of
compression provided by <i>Speak Freely</i>, that used by
<a href="http://ccnga.uwaterloo.ca/~jscouria/GSM/gsmreport.html">GSM digital cellular
telephones</a>, reduces the data bandwidth requirement by almost a factor of five
but is so computationally intense it can be done in real time only on a
fast 486 or Pentium machine. Encryption also takes time; the three methods
available vary in the computation required. Compression reduces encryption
overhead since there's less to encrypt.
<p>
Whether <i>Speak Freely</i> will work effectively for you depends upon your CPU
speed, network bandwidth, load on the network, and the compression and
encryption modes you select in a complicated and subtle manner. The best way
to find out is to try it; if it works, great; if it doesn't, try again when you
next upgrade your computer or network connection.
<i>Speak Freely</i> provides a built-in
<a href="benchmark.htm">performance benchmark</a> to assist you in
selecting modes appropriate for your computer. You can
experiment to determine which settings work best by
connecting to an <a href="echo.htm">echo server</a> which returns any sound
you send to it after a 10 second delay.
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