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POfaster alternative to windows.h's Beep()
 

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  1. POfaster alternative to windows.h's Beep()
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    <p>I'm working on a personal project. I want to transmit some data over the air with an old ham radio.</p> <p>My first draft application works like that :</p> <p>I construct one byte with 4 "signals" :</p> <ul> <li><p>5000hz means "00"</p></li> <li><p>6khz means "01"</p></li> <li><p>7khz means "10"</p></li> <li><p>8khz means "11"</p></li> <li><p>9khz means same as the previous one</p></li> </ul> <p>then I merge those 4 couple of bits together and start again with the next one. </p> <p>The demodulation works great and should be fast enough, but I'm having an issue with the sound generation... it's slow...</p> <p>Here's my debug code :</p> <pre><code>#include &lt;iostream&gt; #include &lt;windows.h&gt; using namespace std; int main() { Beep( 5000, 100 ); Beep( 6000, 100 ); Beep( 7000, 100 ); Beep( 8000, 100 ); Beep( 9000, 100 ); return 0; } </code></pre> <p>I'm expecting 5 beeps, close together, 100ms each but here's what I get (on top, five "100ms Beeps(), and on the bottom, five "20ms Beeps()" : <img src="https://i.imgur.com/wTnXggT.png" alt="a"> </p> <p>As you can see, what I get is 50ms beeps followed 75ms pause when I want 100ms beeps, and 10ms beeps followed by 100ms pause when I want a 20ms beep.</p> <p><strong>Is there something faster and more accurate than Beep() for Windows ? (something that works with linux as well would be even better because the final application should work on a raspberry pi)</strong> </p> <p>I would get the higher usable bandwidth with 3ms sounds (.... 41 bytes/sec.... which is more than enough for my application)</p> <p>Compiler : g++ (mingw) </p> <p>Os : seven 64bits</p>
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    1. CO`Beep()` is definitely the wrong tool for this job. It's not designed to be precise by any means. You would need to generate the waveform data and write them to a sound card (or equivalent), which is inherently platform-specific. Another option is using a microcontroller that modulates the signal and attach it to your computer (which would make porting the code somewhat easier).
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    2. COYou are going to need to pick a single operating system. The solution you go for on Windows is unlikely to be the same on the pi.
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    3. CO@In silico, using a microcontroler is going to be a last ressort solution (I'm fairly confortable with atmel's µCs and have the necessary tools to etch my own pcbs but I'd rather go without the extra hardware)
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