Joe Mama wrote in
u:

Bob Quintal wrote:
EricK wrote in
:


My Last Sigh wrote:

I am reading a book on studio tricks used to create bigger
sounds in home recording. One term mentioned is to dupe a
track, and "flip the phase" of the track. While I know what
this meas technically, what does one do to "flip the phase"
on a digital recording? Is there a piece of hardware to
use, or should I try software, or what? Thanks.

What they meant to say was to flip the "Polarity".


Flipping the polarity results in a 180 degree phase
difference between the two tracks. .

As I understand it, phase isn't a function of amplitude but of
time. Which makes that only true for repeating waves (sine,
square, etc.), and not for complex audio waveforms. Yes? No?

First of all, those complex audio waveforms are made up by
adding together multiple sine waves. so are square waves (all
harmonics of the sine), and triangle waves (all odd harmonics).

Now to answer your question, Complex audio waveforms contain
repeating patterns, it's just that the patterns are complex, not
simple like a sine wave, therefore phase (technically phase
time) is applicable to audio.

Also, note that a complex audio wave has two parts, the
repeating waveform, and a much slower envelope. Both have
ampolitude and phase, as defined bi the National Institute of
Science and Technology (NIST). Their definition of phase is .

phase: 1. Of a periodic, varying phenomenon, e.g., an electrical
signal or electromagnetic wave, any distinguishable
instantaneous state of the phenomenon, referred to a fixed
reference or another periodic varying phenomenon.

http://www.its.bldrdoc.gov/fs-1037/dir-027/_3976.htm has further
description and examples.

One could say the positive phase of a wave versus the negative
phase and be correct, in engineering terms.

Cheers,
-joe.


Cheers.

--
Bob Quintal

PA is y I've altered my email address.