I want to discuss the Nyquist theorem, anyone interrested?

mr_push_pull · 1st February 2005, 10:09 AM

Hello all

From time to time I run into phrases like "the shortcomings of the Nyquist theorem" or "misuderstanding or misuse of the Niquist theorem". Until I became interrested in audio, this seemed so straightforward and well-established, but now I'm beginning to question my knowledge. Not that I ever pretended that I was at such a high level, but at least I thought I understood what the Nyquist theorem was all about.
Also, this would cover the OS/NOS issue somehow. Anyone willing to discuss this?

Bricolo · 1st February 2005, 10:25 AM

I'm interested too

peranders · 1st February 2005, 10:46 AM

It's pretty simple. If you sample with 48.0000000000 kHz you can reproduce 23.99999999999 kHz.

mr_push_pull · 1st February 2005, 10:51 AM

So, why the need for SACD and DVD-audio if most of us can't even hear 20KHz?

pinkmouse · 1st February 2005, 10:51 AM

48K sampling gives you 23.999Hz?

Now I know why my CDs sound so bad!

Carondimonio · 1st February 2005, 10:57 AM

Quote:

Originally posted by pinkmouse
48K sampling gives you 23.999Hz?

Now I know why my CDs sound so bad!

ROTFLMAO!!!

peranders · 1st February 2005, 11:03 AM

Quote:

Originally posted by pinkmouse
48K sampling gives you 23.999Hz?

Now I know why my CDs sound so bad!

Yes, something is wrong. Maybe I forget the snubbers or the Black Gate , I don't know.

peranders · 1st February 2005, 11:05 AM

Quote:

Originally posted by mr_push_pull
So, why the need for SACD and DVD-audio if most of us can't even hear 20KHz?

This is a completely different debate and has nothing to do with the sampling question.

ThorstenL · 1st February 2005, 11:10 AM

Konnichiwa,

Quote:

Originally posted by mr_push_pull
From time to time I run into phrases like "the shortcomings of the Nyquist theorem" or "misuderstanding or misuse of the Niquist theorem".

It is very simple. The Nyquist Theorem is a mathematical theorem that states the conditions under which the complete original information may be retrieved from a sampled source. Like any serious "pure" mathematical theorem it is absolutely true, completely coherent and ABSOLUTELY not applicable to any parcticular actual reality.

Therefore the term "misapplication" for using Nyuists theorem to predict the actual ability of a system sampling a pseudo-random waveform (music).

Therefore you may discuss Nyquist untill you are blue in the face and you will be non the wiser.

Not interested.

Sayonara

mr_push_pull · 1st February 2005, 11:11 AM

Quote:

Originally posted by peranders

This is a completely different debate and has nothing to do with the sampling question.

Is it? If so, I could open another thread about it, but I don't think it is necessary. Why need 192KHz sampling frequency if 44.1KHz is enough?

1st February 2005, 10:09 AM	#1
mr_push_pull diyAudio Member Join Date: Mar 2004 Location: At the output stage	I want to discuss the Nyquist theorem, anyone interrested? Hello all From time to time I run into phrases like "the shortcomings of the Nyquist theorem" or "misuderstanding or misuse of the Niquist theorem". Until I became interrested in audio, this seemed so straightforward and well-established, but now I'm beginning to question my knowledge. Not that I ever pretended that I was at such a high level, but at least I thought I understood what the Nyquist theorem was all about. Also, this would cover the OS/NOS issue somehow. Anyone willing to discuss this? __________________ "This site gives off very confusing signals, one minute highly technical discussions that leave the truly interested learners wallowing in their own stupidity and the next finds it endlessly repeating old wives tales and cockeyed theories as fact."

1st February 2005, 10:25 AM	#2
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	I'm interested too __________________ Just remember: in theory there's no difference between theory and practice. But in practice it usually is quite a bit difference... Bob Pease

1st February 2005, 10:46 AM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	It's pretty simple. If you sample with 48.0000000000 kHz you can reproduce 23.99999999999 kHz. __________________ /Per-Anders (my first name) or P-A as my friends call me

1st February 2005, 10:51 AM	#4
mr_push_pull diyAudio Member Join Date: Mar 2004 Location: At the output stage	So, why the need for SACD and DVD-audio if most of us can't even hear 20KHz? __________________ "This site gives off very confusing signals, one minute highly technical discussions that leave the truly interested learners wallowing in their own stupidity and the next finds it endlessly repeating old wives tales and cockeyed theories as fact."

1st February 2005, 10:51 AM	#5
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	48K sampling gives you 23.999Hz? Now I know why my CDs sound so bad! __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort


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