[FM Discuss] new xml file

[adam hyde]

slightly different format...nested chapter info so we can list all
chapters for a book in 1 file

<?xml version="1.0" encoding='UTF-8'?>
<booki-revision>
	<manual>pure data</manual>
	<chapter name="additive synthesis">

<url>http://en.flossmanuals.net/bin/view/PureData/AdditiveSynthesis</url>
		<version number="1.1">
			<contributor>Derek Holzer</contributor>
			<date>16 Sep 2008</date>
			<time>4.06</time> 
			<text>
Additive Synthesis

Because Pd adds together the audio signals which come to the inlet of
any audio object, it's simple to add two or more signals together into a
single waveform. Below, we can see what happens when a Sawtooth Wave and
a Sine Wave are added together. The resulting waveform is a combination
of the shapes of both, added together. Note that the two waveforms are
sent to an Audio Multiplication [*~] object, which multiplies the
combined signal by half to reduce the total range of values sent to the
soundcard.

image=osc4

Remember that, at full volume, each oscillator is going from either 0 or
-1  to 1 many times a second. Because most everything in Pd is simply
numbers, any number of signals can be added together. However, if the
combined values of those signals go outside the -1 to 1 range when they
reach the Digital to Analog Converter [dac~] object (i.e. the line out
to the sound card), then clipping and distortion will occur. Any value
outside of the accepted range will simply be treated as a -1 or a 1. You
can see how two combined signals can go outside this range on the graph
in the patch below.

image=osc5

An interesting thing happens when we combine two waveforms whose
frequencies are very close to each other. The combined values of the two
waves interfere with each other, causing a periodic modulation of the
sound. The frequency of this modulation is equal to the difference of
the two original frequencies in Hz. This is known as a "beating
frequency", or "phase interference". The sound of two oscillators
slightly de-tuned from each other is often used for different kinds of
electronic music sounds, such as a "fat" bass effect.

image=osc6
			</text>
		</version>
		<version number="1.2">
			<contributor>Adam Hyde</contributor>
			<date>04 Apr 2009</date>
			<time>23.16</time> 
			<text>
Additive Synthesis

Since Pd adds together the audio signals which come to the inlet of any
audio object, it's simple to add two or more signals together into a
single waveform. Below, we can see what happens when a Sawtooth Wave and
a Sine Wave are added together. The resulting waveform is a combination
of the shapes of both, added together. Note that the two waveforms are
sent to an Audio Multiplication [*~] object, which multiplies the
combined signal by half to reduce the total range of values sent to the
soundcard....[adam:someone put a new image here]

image=osc4

Remember that, at full volume, each oscillator is going from either 0 or
-1  to 1 many times a second. Because most everything in Pd is simply
numbers, any number of signals can be added together. However, if the
combined values of those signals go outside the -1 to 1 range when they
reach the Digital to Analog Converter [dac~] object (i.e. the line out
to the sound card), then clipping and distortion will occur. Any value
outside of the accepted range will simply be treated as a -1 or a 1. You
can see how two combined signals can go outside this range on the graph
in the patch below.

image=osc5

An interesting thing happens when we combine two waveforms whose
frequencies are very close to each other. The combined values of the two
waves interfere with each other, causing a periodic modulation of the
sound. The frequency of this modulation is equal to the difference of
the two original frequencies in Hz. This is known as a "beating
frequency", or "phase interference". The sound of two oscillators
slightly de-tuned from each other is often used for different kinds of
electronic music sounds, such as a "fat" bass effect.

image=osc6 
			</text>
		</version>
		<version number="1.3">
			<contributor>Daniel Shiffman</contributor>
			<date>07 Apr 2009</date>
			<time>00.25</time> 
			<text>
Since Pd adds together the audio signals which come to the inlet of any
audio object, it's simple to add two or more signals together into a
single waveform. Below, we can see what happens when a Sawtooth Wave and
a Sine Wave are added together. The resulting waveform is a combination
of the shapes of both, added together. Note that the two waveforms are
sent to an Audio Multiplication [*~] object, which multiplies the
combined signal by half to reduce the total range of values sent to the
soundcard.

image=osc4

Remember that, at full volume, each oscillator is going from either 0 or
-1  to 1 many times a second. Because most everything in Pd is simply
numbers, any number of signals can be added together. However, if the
combined values of those signals go outside the -1 to 1 range when they
reach the Digital to Analog Converter [dac~] object (i.e. the line out
to the sound card), then clipping and distortion will occur. Any value
outside of the accepted range will simply be treated as a -1 or a 1. You
can see how two combined signals can go outside this range on the graph
in the patch below.

image=osc5

An interesting thing happens when we combine two waveforms whose
frequencies are very close to each other. The combined values of the two
waves interfere with each other, causing a periodic modulation of the
sound. The frequency of this modulation is equal to the difference of
the two original frequencies in Hz. This is known as a "beating
frequency", or "phase interference". The sound of two oscillators
slightly de-tuned from each other is often used for different kinds of
electronic music sounds, such as a "fat" bass effect.

image=osc6
			</text>
		</version>
	</chapter>
</booki-revision>

-- 
Adam Hyde
Founder FLOSS Manuals
German mobile : + 49 15 2230 54563
Email : adam at flossmanuals.net
irc: irc.freenode.net #flossmanuals

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