<p>On the receiving side the symmetric operations are performed when phone rings are detected.</p>
<p>On the receiving side the symmetric operations are performed when phone rings are detected.</p>
- <p>This is basically a <em>Pulse-Distance Modulation</em> (PDM), this scheme has been chosen because it's easy to detect when a phone starts ringing, but it's not always easy to detect for how log it rings, or how many rings there are in a single call.</p>
+ <p>This is basically a <em>Pulse-Distance Modulation</em> (PDM), this scheme has been chosen because it's easy to detect when a phone starts ringing, but it's not always easy to detect for how long it rings, or how many rings there are in a single call.</p>
<p>See an example of the exchange of the message <code>CODEX</code>:<br />
<a href="images/savemysugar_plot_codex.png" title="SaveMySugar exchanging the message 'CODEX'"><img src="images/savemysugar_plot_codex.png" alt="SaveMySugar exchanging the message 'CODEX'" /></a></p>
<p>See an example of the exchange of the message <code>CODEX</code>:<br />
<a href="images/savemysugar_plot_codex.png" title="SaveMySugar exchanging the message 'CODEX'"><img src="images/savemysugar_plot_codex.png" alt="SaveMySugar exchanging the message 'CODEX'" /></a></p>