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Old 24th December 2009, 06:03 PM   #1
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Default Need the best 1 khz impulse wav file

Hello

I would need the best 1 khz impulse wav file to put it on a cd.

All the tone and sound generator freewares that I have try did generate impulse with ringing.

So, is there a freeware who generate a near perfect impulse.

Or is there any guy who would have a near perfect 1 khz impulse wav file, a file of arround 10 second would be ok.

Thank and Merry Xmas

Bye

Gaetan

Last edited by gaetan8888; 24th December 2009 at 06:11 PM.
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Old 24th December 2009, 07:12 PM   #2
bwaslo is offline bwaslo  United States
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Not sure what you are after. How could it be a "1kHz impulse" without ringing? Do you mean a toneburst (but that would of course be oscillatory).

An impulse without ringing would have all expressable frequencies (and if digitally coded could show no ringing only by being sampled just so - delay it by a quarter sample and the ringing would be visible again).
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Old 24th December 2009, 07:15 PM   #3
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What exactly do you mean? A file with 43 samples with value 0, then one with positive full scale value, then 43 with value 0, one at positive full scale and so on, giving you a repetition frequency of 44100 Hz/44? Even that will result in ringing as soon as you play it back through a DAC with reconstruction filter.

With GoldWave, which is not freeware but which has a free trial period, you can make just about any waveform as long as you can write an equation for it. Just enter the equation in the expression evaluator.
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Old 24th December 2009, 09:32 PM   #4
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Hello

Yes, I agree that there will be ringing wen play back through a DAC with reconstruction filter.

But I want to check on my scope different OS and non-OS dac and also dvd impulse responses, to do experiments, so I need a near perfect 1 khz impulse wav file.

Thank

Bye

Gaetan
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Old 24th December 2009, 10:11 PM   #5
bwaslo is offline bwaslo  United States
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But what is a 1kHz impulse wav file??? Can you describe what the waveform should look like? A stick played over and over 1000 times a second (that's not an impulse, btw).

Or what
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Old 24th December 2009, 10:17 PM   #6
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OK, then try this expression in the GoldWave expression evaluator:

abs(0.5*sgn(sin(2*3.14159265358979*(n+0.5)/88))-0.5*sgn(sin(2*3.14159265358979*(n-0.5)/88)))

This should give you a series of impulses at fs/44.

Regards,
Marcel
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Old 25th December 2009, 12:30 AM   #7
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Hello

GoldWave are much better than CoolEdit96 and Audacity

Thank

Bye

Gaetan
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Old 26th December 2009, 02:39 PM   #8
Pano is offline Pano  United States
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The formula works great. Thanks Marcel!
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