[LINK] How can analogue be better? [was: all the music in the world]

grove at zeta.org.au grove at zeta.org.au
Tue Jun 2 14:25:58 EST 2009

On Tue, 2 Jun 2009, Stephen Wilson wrote:

> Jan Whitaker wrote:
>> Ivan Trundle wrote:
>>> Mock me for being an 'audiophile' if you wish ...
>> I had a professor friend back in the 70s who would only listen to vinyl, never tape. Think cravat, pipe, and a fine port.
> Or ... think phase response.  I think the reason digital sounds funny is
> that sampling at 40-odd kilohertz ruins any phase differences between
> the two stereo channels smaller than 25 microseconds.  But the human
> hearing system is sensitive to phase differences of as little as one
> microsecond, when constructing the stereo image.
> You can tell just by looking at a vinyl record that it contains signals
> of at least 100kHz (while a CD is limited by anti-aliasing filtering to
> 20kHz; MP3 may in effect be lower still).  The coloured rainbow patterns
> seen on an LP's surface are caused by optical interference, indicating
> physical structures in the grooves about the same size as the wavelength
> of visible light - say 500nm (I think these structures are caused by a
> high frequency bias signal applied to the master record cutting
> stylus).  My back of the envelope is that this corresponds to a
> frequency of 100kHz.
> I'm not saying there are 100kHz sound waves in the LP that can get
> through the amplifier and speakers and our ears into the brain.  But
> there can be phase information at the 1 to 10 microsecond range that
> does get through -- but only in an analogue system.



Rachel Polanskis                 Kingswood, Greater Western Sydney, Australia
grove at zeta.org.au                http://www.zeta.org.au/~grove/grove.html
We are buried beneath the weight of information, which is being confused with
knowledge; quantity is being confused with abundance and wealth with happiness.
- Tom Waits

More information about the Link mailing list