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Old 7th May 2006, 09:49 PM   #1
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Default help to generate frequencies

Hi all,

I am looking for some help. I would like to make a CD which would have several test tones at various frequencies, starting about 20Hz and going up to say, 30kHz.

I'm sure there must be a reasonably easy way of doing this, but I just can't figure it out.

Anyone have some suggestions? Is there some note generating software that some of you have used already to do this?

thanks in advance,

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Old 7th May 2006, 10:40 PM   #2
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1.Buy a test disc
2.Borrow a test disc and copy it.
3.Get someone with a test disc to create an image for you.
4.Calculate the values and record them to disc. CUPL was supposedly capable of creating spot frequency look-up tables but as to how, I havent a clue.
5.Create and record tones using the usual suspects, i.e. Adobe Audition and any tone generator software. Google will throw up a lot of options.

BTW 30k on a CD might prove a bit tricky.
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Old 7th May 2006, 11:28 PM   #3
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I believe the sampling rate of a cd is 44100 so 22050Hz is your limit on high frequencies. Local car stereo shops will often have test tone cd's but usually to ~80hz
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Old 8th May 2006, 12:29 AM   #4
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Download the Bink Audo Test CD
It's got everything you need on it and free too
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Old 8th May 2006, 12:35 AM   #5
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You can generate spot frequencies, sweeps, IM test tone pairs, etc. using switcherCAD, a free spice simulator you can download from Linear Technology. There is a .wav file output option, so all you need is a circuit with a couple voltage sources and a .wav output statement. You run a time domain simulation and the result gets saved to a .wav file, stereo or as many channels as you want. Use any CDR burning program to burn the files to an audio CDR.

Here is a sample circuit that illustrates the simplicity of this approach. The sine wave voltage sources are set to 1V amplitude which scales to full scale 16 bits out (0 dB) in the .wav file.

The .tran statement starts capturing data at 0 sec and stops at 10 sec. The maximum timestep is 10us, so there will be enough samples that there won't be any missing at 44.1 ksps.

You can set the frequency to 30 kHz if you want, but if you have a decent filter in the CD player, it won't get very far.

You can do different things on two channels if you want. Just set up another voltage source and change the output name in the .wave statement.

Attached Images
File Type: jpg test tone circuit2.jpg (29.8 KB, 129 views)
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Old 8th May 2006, 05:37 PM   #6
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Many thanks to all who responded. I have downloaded the bink test CD and it looks like it'll do the business for me!

thanks again,

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Old 8th May 2006, 08:43 PM   #7
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Originally posted by davidsrsb
Download the Bink Audo Test CD
It's got everything you need on it and free too

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