Is it possible to simulate ac signal with dc?..tia sal

Every audio signal you create with the sound card is an AC signal. Could you be a little more specific?

The signal Cool Edit generates IS an AC signal.

Sal,

If you are outputting any tones, other than just a click, from your sound card, you already have AC signals. When you say "different frequency signals", those are AC (other than a frequency of zero Hertz, which is DC).

You also wrote, "I know the circuit programs Spice and Multisim can due this within the compnter...". With Spice or Multisim, you typically set the parameters of the AC input signal you desire, then "stimulate" the circuit with that signal. Basically, these programs use math functions to simulate the reaction of the stimulated circuit. Alternatively, as in the case of an oscillator circuit, the program computes and displays the output based on the circuit components chosen. I don't believe these programs simulate AC signals from DC, unless you are talking the fact that digital computer circuitry eventually boils down to 1's and 0's.

Did I misunderstand your question?

Richard

card.

AC

Sal:

Cool Edit Pro, Great program.

Define what you mean by, "AC type signal". The sound you hear comming from your speakers is AC. Your sound card cannot or should not output DC voltages as speakers don't much care for DC current in the voice coil. Tell more about what you are trying to do..

Sal:

Cool Edit Pro, Great program.

Define what you mean by, "AC type signal". The sound you hear comming from your speakers is AC. Your sound card cannot or should not output DC voltages as speakers don't much care for DC current in the voice coil. Tell more about what you are trying to do..

Your sound card produces AC signals - that's what sound is, that's what the speakers need.

Am I missing something here? Are you meaning to say that you want to put a DC offset on the AC signal the sound card normally outputs? Or are you meaning to say you want to create a beat signal? Or mixer output (sum and difference signal)?

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Not sure what you mean by "AC signal". Audio frequencies are AC.

card.

AC

Thanks all....

I was just trying to find a cheap way of using my sound card as a frequency generator.

This is what I want to test out.

sal wrote in news:Xns96D16B82A2E9Dsalsppnet@140.99.99.130:

The output of your sound card IS AC. Be more specific in your request. mike

Returns Patent not found message.

When I click on that link, the site gives me this error message:

"Patent not found. Please check the value you entered. Number not defined."

Do you just want to generate a single-frequency sine wave? Cool Edit

Open the program, then: Click on "Generate" Select "Tones" In the "generate tones" window that appears: Click on "A 440 (default)" in the "presets" section (to force all settings to generate a single frequency) Type in any audible frequency number next to "Base frequency" Click "OK", then play it.

Mark

First off, I'm guessing that by "AC" you mean "the waveform that comes out of the wall outlets", namely 60 Hz or 50 Hz. I suspect Cool Edit can do this easily. If not, my own DaqGen freeware can certainly do it, and further allow you to add all sorts of modulations, noise, and other imperfections if you want to simulate real-world problems.

The strict use of the term AC simply means Alternating Current, and doesn't imply a certain frequency. Sound cards *only* put out AC, and can pretty much put out anything up to half the selected sample rate on the high frequency end. But on the low frequency end, they are limited to a few Hz minimum (the minimum may be as high as 20 Hz or more on some older cards). That's because there are DC blocking capacitors in the output (and input) lines. Since they are designed for audible sound, and since you can't hear much below 20 Hz anyway (and since this makes it *way* simpler/cheaper to design) this is no big deal for most uses.

Let me know if you have any questions about your specific simulation using DaqGen... there are a *lot* of controls, which might be intimidating at first. But a simple 60 Hz sine should be a piece of cake.

Best regards,

Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis

The signal comming out of the analog output jack(s) of your soundcard IS AC. So you dont have to worry about converting it.

--Andy P

sal wrote:

Sorry about that this link should work

I wanted to test this patent out using my sound card

"St. John Smythe" wrote in news:dg9cb1$v8j$ snipped-for-privacy@n4vu2.nvu.com:

Here's another link if the other one doesn't work the Patent number is 4394230

Title: Method and apparatus for splitting water molecules Document Number: United States Patent 4394230

sal wrote in news:Xns96D26C294BF6Csalsppnet@140.99.99.130:

Err...last time i looked, recorded sound *was* an AC signal. Have you changed any of the laws of physics wheni was not looking?

You can use the generate -> tones to create ac signals or you cold just record silence and zoom in to the maximum and then you can manually alter the "dc" waveform with the mouse to create any desired signal. Hope this helps.

Anders

A sine wave at 50 or 60Hz is an "AC type signal", but you'd need a huge amplifier if you wanted to use it to run any appliances :)

Bye. Jasen