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POJSyn, siren sound using oscillator fed/controlled/inputInto/daisy-chainedTo by another oscillator and a constant...and generating more than one sound
 

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  1. POJSyn, siren sound using oscillator fed/controlled/inputInto/daisy-chainedTo by another oscillator and a constant...and generating more than one sound
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    <p>I have been trying to follow the example here, but it is not working, and I have not been able to find any other sources: [ <a href="http://www.softsynth.com/jsyn/tutorial/osc_control.php" rel="nofollow">http://www.softsynth.com/jsyn/tutorial/osc_control.php</a> ][1]</p> <p>As far as I can tell, I have followed this sample code snippet exactly (except that I found out that <code>AddUnit</code> changed to <code>Add</code> sometime since that webpage was updated):</p> <blockquote> <p>[...]make the frequency to waver slightly about a central frequency that is in a more useful range. We can do this by using an AddUnit to add the output of an oscillator to a constant value that we can set. We can also reduce the amplitude of the first oscillator to be within a smaller range.</p> </blockquote> <pre><code>AddUnit freqAdder = new AddUnit(); sineOsc1.output.connect( freqAdder.inputA ); // pass through adder freqAdder.output.connect( sineOsc2.frequency ); // control second oscillator freq freqAdder.inputB.set( 500.0 ); // add constant that will center us at 500 Hz sineOsc1.amplitude.set( 100.0 ); // reduce offset to +/- 100 Hz </code></pre> <blockquote> <p>Thus the frequency of sineOsc2 will be sineOsc1.output plus inputB.</p> </blockquote> <p>Can anybody see what is wrong with my code (below)? I already have a simple oscillator sound working. I just can't hear this second, more complicated sound, which is supposed to be siren-like.</p> <p>It may be a problem with my coding of the siren sound, or it may just be a problem with my coding of generating two sounds. (Are 2 <code>Synthesizers</code> required? I have tried it with 1 and 2 <code>Synthesizers</code>.) (Are 2 lineOuts required? Other web sources say "no".)</p> <p>Here is my code with 2 <code>synthesizers</code> and 1 output:</p> <p>(Comments in quotes are from other sample code. I only understand a little of what those comments are getting at.)</p> <pre><code>import com.jsyn.JSyn; import com.jsyn.Synthesizer; import com.jsyn.unitgen.Add; import com.jsyn.unitgen.LineOut; import com.jsyn.unitgen.SineOscillator; [...] com.jsyn.Synthesizer synthPCMSonification = JSyn.createSynthesizer(); com.jsyn.Synthesizer synthPCMAlarm = JSyn.createSynthesizer(); // "an instance of Synthesizer" com.jsyn.unitgen.SineOscillator oscData = new SineOscillator(); SineOscillator oscAlarmWaverEnvelope = new SineOscillator(); SineOscillator oscAlarmComplete = new SineOscillator(); // "a unit" com.jsyn.unitgen.LineOut oscsLineOut = new LineOut(); // "a unit" [...] // "start synthesis engine" synthPCMSonification.start(); synthPCMAlarm.start(); // "build unit generators" synthPCMSonification.add(oscData); //synthPCM.add(oscAlarmWaverEnvelope); //TODO: Figure out if need line synthPCMAlarm.add(oscAlarmComplete); synthPCMSonification.add(oscsLineOut); synthPCMAlarm.add(oscsLineOut); oscData.frequency.set(LOWEST_FREQUENCY_C); oscData.amplitude.set(volSonification); //create a frequency adder for a siren-like alarm com.jsyn.unitgen.Add oscAlarmFreqAdder = new Add(); //used to be AddUnit //set the alarm centre frequency alarmCentreFreq = (LOWEST_FREQUENCY_C * Math.pow(2, OCTAVES_SPANNED_C + 1)); //This formula centres the alarm one octave //above the threshold's sonification freqency alarmWaverFreq = alarmCentreFreq / 10; //This sets the waver at one tenth of the centre freq //Unfortunately, the waver appears to need to be the //same amount above and below the centre //(linear, vice perceptually-linear (exponential)) System.out.println(alarmCentreFreq + "-Hz alarm centre frequency"); oscAlarmFreqAdder.inputB.set(alarmCentreFreq); //set the alarm waver envelope //(alarm will range between centre-waver and centre+waver) oscAlarmWaverEnvelope.frequency.set(alarmCentreFreq / 10); //"pass through adder" (??) oscAlarmWaverEnvelope.output.connect(oscAlarmFreqAdder.inputA); //(entered this with by starting to type, then hitting [Ctrl]+[Space]!) //"control the 2nd oscillator frequency" (?) oscAlarmFreqAdder.output.connect(oscAlarmComplete.frequency); //set alarm volume oscAlarmComplete.amplitude.set(volAlarm); // "connect unit generators" // connect oscillator to both channels of stereo player oscAlarmComplete.output.connect(0, oscsLineOut.input, 0); oscAlarmComplete.output.connect(0, oscsLineOut.input, 1); // "startUnitGenerators" // "start execution of units. JSyn 'pulls' data so the only unit // you have to start() is the last one, in this case our LineOut" oscsLineOut.start(); </code></pre> <p>How many people out there know and use <code>JSyn</code>? How about <code>meta-oscillators</code>?</p> <p>If you have ever connected different <code>JSyn</code> parts together, or even just got it to output more than one sound at once, you know more than I do...</p>
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