Home Computer Audio Asylum

Music servers and other computer based digital audio technologies.

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Computer Audio Asylum ]
[ Alert Moderator ]

RE: Better duck under that desk;

"to say unequivocally whether the changes Kuncher has detected can or can't be resolved by 44.1 KHz sampling."

Yes, they can be resolved.

The theoretical limit on the time resolution of a sampled quantised system is the sampling period divided by the number of quantisation steps (I may be off with a factor of 2).

Applications like cellphones, modems, and optical attitude sensors exploit this phenomenon.

"I don't get Tony's argument that the tests should have used a frequency more in line with RBCD parameters"

The tests were done with 7kHz square waves. Both Tony and I wonder about what would happen with 8kHz. For two reasons.

1) The third harmonic of 7k is 21k. If the auditory system is sensitive
(in some unknown way) to sound above its nominal cutoff frequency, then surely this 21k would figure heavily in the detection process. But the thing is: 21k can be passed by 44.1kHz sampled systems.
Re-doing the test with 8k would put the third at 24k, which cannot pass
a 44.1k system.
So the 7k test cannot prove (contrary to K's claim) that 44.1k is insufficient. On the other hand, if people pass an 8k test (which was not tried), and if the detection mechanism involves the third harmonic (which we don't know), then 44.1k is proven to be insufficient.

2) The first intermodulation product of 7k and 21k is 14kHz. Many people still hear 14k. The first intermod prod of 8k and 24k is 16k. Many people don't hear 16k anymore. If the auditory system uses the level and phase of this intermod product for detecting the differences experimentally tested by K, then the outcome of such test would differ drastically between 7k and 8k.

I hope this clarifies things a bit.



And then you wake up and realise that your classmates of old ... are running most of the TV shows.

This post is made possible by the generous support of people like you and our sponsors:
  VH Audio  

Follow Ups Full Thread
Follow Ups
FAQ

Post a Message!

 Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Subject:
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2026, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]