Randy Yates wrote:
ruffrecords writes:


Randy Yates wrote:

ruffrecords writes:


PenguiN wrote:


The sound produced by the speaker happens because the speaker is driven
None of those approximates in any way, or
is a valid anology for a loudspeaker producing a complex waveform that comes

from only one source, the complex electrical waveform driving the speaker


motor. All the other anologies have two sources, one for the low frequency
motion and one for the high frequency sound, NOT a valid anology for what
happens when a speaker reproduced a complex waveform.

What if we take this to the extremes with a thought experiment:

Picture the largest loudspeaker in the universe sitting outside

somewhere. It's so big that it has a maximal excursion of several
feet. Now picture a very low bass signal played on that speaker at
almost maximal volume. The speaker cone is vibrating
in-out-in-out-in-out.
Now add to that signal a small, high pitched, low amplitude waveform.

The two waveforms are added together so that it seems like the higher
pitched wave is "riding on top of" the bass wave.


What gets added are the instantaneous pressures. The air pressure
produced is exactly the same as two separate speakers at the two
frequencies. There is no such thing as doppler distortion.

Consider this gedanken: Place a 4-inch speaker on the cone of a
14-foot

speaker. Now, the two speakers are fed different signals.

Consider this. place a 14ft speaker next to a 4inch speaker and feed
them different signals. Is there Doppler? No



Hey man, stay stupid - see if I give a ****.

Nothing stupid about it. If both systems are linear then they will work
in an identical manner.

Ian