--- Richard Dobson <email@hidden>
wrote:
>
> So, what on earth are Apple up to here, trying to
> patent tremolo? Prior
> Art? Decades...
As far as I can see (after reading the complete text),
the patent application does not have anything to do
with tremolo or amplitude modulation, apart from the
side effect you get when mixing a sine wave with
another, slightly detuned sine wave.
But this is not about sine waves. In my understanding,
the patented method is a way of getting beat
frequencies which are constant along a large range of
main frequencies. I.e. if you have your two
oscillators playing C3, and the beat frequency is 3
Hz, then if you play C4, the beat frequency will be 6
Hz using 'prior art'. Using Apple's method, this beat
frequency will *always" be 3 Hz.
My two cents.
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