Audio Delay

Hi,
I'm trying to add a delay in one of the signals that is generated in my system, so I want to be able to add a delay to one of the signals so that signal lags the other signal so using when using headphones it sounds like the sound is coming from either the right/left channel. I want the amplitude of both the signals to be the same and I just want to add a delay, so for example If I delayed the left channel speaker by 0.005 then the user should be able to tell that the sound is coming from the right channel even though the amplitudes of both the signals are the same. I've attched my attempt at this. I want one of the signals to be delayed continuosuly and not just at the onset. So I want one of the channels to be delayed by a certain amount of time compared to the other channel so using headphones it sounds like sound is coming from one of the sides of the head.
Thanks
Solved!
Go to Solution.
Attachments:
Headphones-Delay.vi ‏98 KB

Several things about your VI do not make much sense.
1. Delaying one random signal with respect to another is completely meaningless. The sounds are totally uncorrelated before the delay so the ear/brain/mind system will not be able to detect any difference after the delay. If they are correlated, only generate one signal and modify it in two different ways. Try a sinusoidal signal.
2. Changing t0 will not have any effect. Sound Output Write ignores the timing information in the waveforms.
3. Since you are using error status as one of the ways to stop the VI, it would make more sense to wire it to the output of the Sound Output Write.vi to catch all the errors. Wiring errors through the signal generation VIs is probably a good idea also.
Here is a version which changes the phase of one signal with respect to the other using sine waves. It has some small glitches when the phase is changed but it does seem to "move" the apparent source position. I am not sure exactly where the speakers are hidden in my computer so I cannot verify the performance. For my old ears it seemed that the position changes were more noticeable with lower frequencies. Delay Right is the phase of one signal in degrees. The other signal has the pahse set to zero.
Lynn
Attachments:
Headphones-Delay.2.vi ‏22 KB

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