Re: [LAU] Rolling off high frequencies when mastering?

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To: Rob <lau@...>
Cc: <linux-audio-user@...>
Date: Wednesday, April 21, 2010 - 8:47 pm

On Wed, Apr 21, 2010 at 4:34 PM, Rob wrote:

In any good system, both are going to be silence, as they've been
entirely lowpassed away.

Choosing something a little lower (like 18kHz), they'll still be
identical, as the harmonics that make a square wave a square wave will
also have been lowpassed away. The square wave's first harmonic (OK,
it's actually called the 'second harmonic, as the 'first harmonic' is
the fundamental) is at 36kHz, above Nyquist.

When you filter away all the harmonics of a square wave, what do you
get? A sine wave.
When you filter away all the harmonics of a triangle wave, what do you
get? A sine wave.

> It seems like a pretty esoteric thing to care about, but if one does care

Completely incorrect. No shred of truth, period.

> The Nyquist frequency is the threshold

I grant this is an advanced a topic that relatively few people have
studied. But just because you personally don't understand it doesn't
make it 'not so'.

Monty
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Messages in current thread:
[LAU] Rolling off high frequencies when mastering?, Ken Restivo, (Wed Apr 21, 1:35 am)
Re: [LAU] Rolling off high frequencies when mastering?, Monty Montgomery, (Wed Apr 21, 7:17 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Arnold Krille, (Wed Apr 21, 3:25 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Arnold Krille, (Wed Apr 21, 6:42 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Arnold Krille, (Wed Apr 21, 6:51 am)
Re: [LAU] Rolling off high frequencies when mastering?, Arnold Krille, (Wed Apr 21, 9:02 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Arnold Krille, (Wed Apr 21, 10:19 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Fons Adriaensen, (Wed Apr 21, 11:30 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Monty Montgomery, (Wed Apr 21, 7:12 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Niels Mayer, (Wed Apr 21, 8:59 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Gwenhwyfaer, (Sat Apr 24, 5:27 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Monty Montgomery, (Wed Apr 21, 10:19 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Jörn Nettingsmeier, (Wed Apr 21, 9:43 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Monty Montgomery, (Wed Apr 21, 8:47 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Niels Mayer, (Wed Apr 21, 5:19 pm)
Re: [LAU] Rolling off high frequencies when mastering?, Niels Mayer, (Wed Apr 21, 5:47 am)
Re: [LAU] Rolling off high frequencies when mastering?, Reuben Martin, (Wed Apr 21, 4:52 am)