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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>

<head>
<meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1">
<meta name="GENERATOR" content="Microsoft FrontPage 2.0">
<title>David's Sweep Generator</title>
</head>

<body>

<h1 align="center">David's Sweep Generator</h1>

<hr>

<h2 align="center">Safety Notice</h2>
<div align="center"><center>

<table border="1" width="70%">
    <tr>
        <td><b>Playing a continuous tone at a high level might
        damage your amplifier, speakers, or hearing. Please
        exercise sensible precautions! </b></td>
    </tr>
</table>
</center></div>

<hr>

<p>This HTML documentation has arrived after the bulk of the work
on SweepGen was done, so there is quite a lot in the ReadMe.txt
that is duplicated here. I didn't want to remove anything from
the ReadMe.txt, since I always go there first after downloading
something to see what it's about, and I presumed you might want
to do the same. So I've provided a brief overview below, a little
note on phase checks (new in version 2.1), and some details about
<a href="details.htm">using SweepGen</a> showing what the various
controls are for. This is really for clarification, as I hope
that most controls are easy to understand. </p>

<hr>

<h3>Overview</h3>

<p>SweepGen turns a sound-equipped PC into an Audio Oscillator
and Sweep Generator. In conjunction with audio test instruments,
you can make frequency response plots. SweepGen uses the sound
card in your PC to produce sinewaves that are mathematically
correct almost to CD quality, indeed it's more likely that the
quality of your PC sound card will be the limiting factor rather
than the code in SweepGen. If you are interested in programming
the sound hardware at a low level under Windows, you may find
SweepGen's source code helpful in understanding the programming
techniques involved. </p>

<h3>Phase Checks</h3>

<p>There are three modes of output operation. Normally, both left
and right channels are indentical, i.e. in-phase. Optionally, you
can make the channels out-of-phase which can be useful for
checking the relative phase of a pair of loudspeakers. If the two
speakers are out of phase, there will be less bass response. The
channels option allows you to hear this effect directly. The
third output mode provides for independent control of channel
amplitude. The program does not provide a mono-summed mode where
two different frequencies at different amplitudes are fed equally
to each channel. </p>

<hr>

<p>This page last revised: <!--webbot bot="Timestamp" startspan
s-type="EDITED" s-format="%Y %B %d" -->1997 October 05<!--webbot
bot="Timestamp" i-checksum="32118" endspan --></p>

<address>
    E-mail: <a href="mailto:david.taylor@gecm.com">david.taylor@gecm.com</a>
</address>
</body>
</html>

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