Wave Arts | Forum | Low brickwall filter doesn’t seem to do much.

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Low brickwall filter doesn’t seem to do much.

mlockett

Posted: 12 December 2005 06:40 AM

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Using the low brickwall filter and following it with a spectrogram… it seems if I set it at 80hz, I can’t tell the difference, ... the 20 hz level doesn’t change. If I move the filter up to 200hz, I start to see an appreciable difference.

The high filter works as expected.

Am I missing something?

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Mike Lockett
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billg

Posted: 12 December 2005 10:16 AM

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I just did a few tests and the brickwall seems to be working correctly. Can you tell me what sampling rate are you using, and what spectrogram are you using? It could be a problem in the spectrogram.

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Bill Gardner
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mlockett

Posted: 12 December 2005 04:06 PM

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Well, I retested it with a white noise generator, and it worked exactly as it should. Either I was confused or my host could have been wigging out (as it does from time to time). I used Voxengo Span and EAS Inspector and repeatedly turned the filter on and off while looping some audio.

Anyway, all is well… sorry to throw up a red flag.

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Mike Lockett
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