LabVIEW synthesizer: sound via his MacBook card output problem

Hi all!

First time posting here, I hope I'm in the right section of the forum. In any case, I am a part-time student and is currently studying a module on Labview at the University. Like a mini project I decided to build a synth using Labview. I built for the most part, but I'm having a little trouble out of sound for the sound card. I am also having a bit of trouble getting the waveforms to play for a long period of time.

I was copying sort of the configuration of one of the example of screw (generation sound vi I think) and an another vi I found online, but I can't seem to get mine to work using my synth design. I have two problems, one is that the waveform only play for a very short time, but the main problem is that I am getting an error (error 4803) saying the sound card can not accommodate the specified configuration, but I can see my setup is more or less the same as the generation sound vi (which works on my thin macbook). Obviously I'm missing something, so I decided to come here and ask for help.

I'm guessing that the type of data connected to my exit the configure vi would be a problem because it has a red dot on the input terminal. Any suggestions on how I should resolve this problem?

I have my attached vi. Any help would be appreciated!

See you soon!

Edit: I have already corrected the error 4803. Had to change configure the entry to the audio output sub vi. Now, I just have to find a way to get the sound to play for more. Any ideas anyone?

Ok. You have several problems.

The order of cluster in your cluster size is rate, Bits, channels, while the order in the cluster 'sound format' on Configure.vi of output is the frequency of sampling (s/s), number of channels, bits per sample. LabVIEW connects clusters according to the order of cluster. How to avoid this: Pop up on the conpane format of its terminal on the icon Configure.vi to audio output on the block diagram, and then choose Create a control. This will put a control with the same names and the order of cluster on the front panel. You can change the name if you wish as long as you do not change the order of cluster. The alternate is to unbundle your cluster control data, and then package it to the cluster of entry. I watch this the change of your attached VI.

The VI does not meet the Stop button until the structure of the event runs, which occurs when a key is pressed. FIX: Add a case of event for the Stop value change event. I watch this the change of your attached VI.

The VI does not recognize changes in the Octave, Amplitude, Osc Select or filter frequency until the second keypress after changing one of these controls. Why? Stream. These controls are probably read in the microseconds after one iteration of the for loop starts. They do not play again until the next iteration no matter when or how many times they are changed. The loop will not iterate until the end of the structure of the event, which only occurs when a key is pressed. The Fix: Case of event for changes in value on these controls. Note that this does not work because now there is no set frequency. So you have also some registers at offset. Because of the problems mentioned, I did not it in modified VI.

Then, the structure of the event freezes the façade has not completed the code inside. This becomes very apparent when you set the duration to 2 seconds, press multiple keys quickly. The solution to this issue and the problem in the previous paragraph is a loop parallel archtitecture, such as the design of producer/consumer model.

Not a problem but another way to do something: use the scale of power of 2 in the digital palette instead of the case connected to Octave structure.  I watch this the change of your attached VI.

Now to your question on the tone duration: the duration of a signal generated by the sinus Waveform.vi and others is determined by the sampling frequency and the number of samples. You are studying, you can do the math. You need to adjust the number of samples as the sampling frequency is fixed.

The modified VI works fine on my iMac.

Lynn

Tags: NI Software

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