Generate continuous signal via audio output

Hi, I would like to use the create a square wave and send it to the output of the soundcard.
I managed to do it via the waveform generators, but the the waveform is not stable, nor continuous, as I am watching it via the oscilloscope. What I see is just packets of waves, buffering into the VI chart.
Shortly, the idea is to use this waveform ( 2kHz and 1V output) rather than using a signal generator, to control some piece of equiment here.
Thanks
A.S.

I think you might want to post your actual VI ... or a snippet of it. Then we can provide more advice.

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PSK signal detail:
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modulated by 16KHz carrier.
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Hi
precisely i have no idea what is the sampling rate of the signal. I just want to generate the signal with constant amplitude based on the actual sampled signal. is it possible to achieve?.
Attached is my actual sampled signal.
Attachments:
data samples.doc ‏32 KB

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Thank you, I think that answered my question. So it would go like this:
(1) All recording tracks plus playback tracks are routed not to stereo master output, but to a pre-master bus, e.g. bus 1.
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(3) On bus 2 (aux master) I select input from bus 1 (the pre-master bus), but route aux master bus output to stereo outputs 3 & 4.
(4) With outputs 3 & 4 I could then go directly into Skype, either on the same machine, or from the sound card 3&4 outputs into the input of a second computer running Skype.
I'll add an image in the follow-up post.

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Unfortunately the way the hardware is configured, you
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Generated Pulse waveform is distorted when I deliver the signal to the output port in the DAQmx

Problem: Generated Pulse waveform is distorted when I deliver the signal to the output port in the DAQmx.
Environment: Windows XP sp3 (32bit), Visual Studio 2010 sp1, NI-Measurement Studio 2010
Device: NI - DAQmx PCI 6251
 Analog Input: 1.00MS/s multi-channel (aggregate)
 Analog Output: 2 Channel 2.00MS/s
Reference Example: AO_ContGenVoltageWfm_IntClk / AI_ContAcqVoltageSamples_IntClk
Generated Pulse:
1) AO0 = Square Waveform /0-5V / 8KHz / 0.5㎲/sample / sample 50% Duty
2) AO1 = Square Waveform /0-5V / 8KHz / 0.5㎲/sample / (Reverse Image)
Description: I’d like to deliver the waveform stream satisfied with specified constraints to the 2 channel output port in the DAQmx. To verify accuracy of the generated waveform, I did an electrical wiring from the Analog output channel (2 channels) to the Analog Input channel (2 channels) in DAQmx. As a result of this experiment, I could get a result which has signal distortion. Since the waveform has to satisfy with both high frequency (8KHz) and very short moment interval time (△t = 0.5㎲/sample) between samples, I cannot handle some parameters of the function in the referenced VC++ example. Following formulas shows an approach to deliver the generate pulse waveform to output port satisfied with constraints.
Analog Output Channel
Frequency = 8,000 cycles/sec (constraint)
Sample per Buffer = 2,000,000 = 2*106 samples/buffer
Cycles per Buffer = 80,000 cycles/buffer
Sample per Channel = 1,000,000 = 1*106 samples/channel
 Sample Rate = Frequency * (Sample per Buffer / Cycle per Buffer)
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 △t = 1 sec / 2*106 samples / sec
           = 0.5 * 10-6 sec/sample (constraint)
 Buffer Cycle = Sample Rate / Sample per Channel
                          = (2*106 samples / sec) / (1*106 samples/channel)
                          = 2 channel / sec
Analog Input Channel
Sample per Channel = 1,000,000 = 1*106 samples/channel
 Sample Rate = 1 MS/s * (2 Channel) = 5 * 105 Samples / Sec
Program Code
AO_ContGenVoltageWfm_IntClk / AI_ContAcqVoltageSamples_IntClk (VC++ Example)
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Please let me know what the conditions make the problem of signal distortion. (AO0 = Green line / AO1 = Red line)
[Figure. 1] Frequency 8000 Hz / Cycle per Buffer = 8000 Result
[Figure. 2] Frequency 1000 Hz / Cycle per Buffer = 1000 Result
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1) Is it possible to deliver the generated pulse wave satisfied with constraints (f= 8KHz), △t = 0.5㎲/sample) to the output port without distortion using PXI 6251?
(Is it possible to solve the problem, if I use the LabView or MAX?)
2) Are there some mistakes in the proposed approach? (H/W or S/W program)
3) What is the meaning of the Cycle per Buffer?, It could effect to the result?

Hi Brett Burger,
Thanks for your reply. For your information, I have set the sampling rate as 10000 as for the sound format, I have set the bits per sample as 16 bit, the rate as 11025 and the sound quality as mono. I tried using your method by changing the sampling rate as 8K but still my program encounter the same problem.
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Many thanks.
Regards,
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Attachments:
Heart Sounds1.vi ‏971 KB

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Hi,
Welcome to the HP Forum!
kommy wrote:
I have installed an ASUS EAH5450 silent graphics card to my Pavilion m7210 desktop but get no audio via HDMI output.I have 2 high Definition Audio Controllers in Device Manager, One has an exclamation mark with message
" This device cannot find enough free resources that it can use. (Code 12)
If you want to use this device, you will need to disable one of the other devices on this system.
You need to restart your computer before the changes you made to this device will take effect."
What do i need to do to get this to work ?
Thanks
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****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
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Generate continuous signal via audio output

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