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< H2 > < A NAME = "SECTION007105000000000000000" >
Analog-style sequencer< / A >
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< P >
Example C08.analog.sequencer.pd (Figure < A HREF = "#fig03.15" > 3.15< / A > ) realizes the analog sequencer and envelope
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generation described in Section < A HREF = "node47.html#sect3.analog" > 3.7< / A > . The "sequence" table,
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with nine elements, holds a sequence of frequencies. The < TT > phasor~< / TT > object at top cycles through the sequence table at 0.6 Hertz. Non-interpolating
table lookup (< TT > tabread~< / TT > instead of < TT > tabread4~< / TT > ) is
used to read the frequencies in discrete steps. (Such situations, in
which we prefer non-interpolating table lookup, are rare.)
< P >
< DIV ALIGN = "CENTER" > < A NAME = "fig03.15" > < / A > < A NAME = "3777" > < / A >
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< CAPTION ALIGN = "BOTTOM" > < STRONG > Figure 3.15:< / STRONG >
An analog-synthesizer-style sequencer.< / CAPTION >
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SRC="img350.png"
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< P >
The < TT > wrap~< / TT > object converts the amplitude-9 sawtooth to a unit-amplitude
one as described earlier in Figure < A HREF = "node47.html#fig03.08" > 3.8< / A > , which is then used to obtain
an envelope function from a second wavetable. This is used to control grain
size in a looping sampler (from Section < A HREF = "node36.html#sect2.example.loop" > 2.6< / A > ). Here the
wavetable consists of six periods of a sinusoid. The grains are smoothed by
multiplying by a raised cosine function (< TT > cos~< / TT > and < TT > + 1< / TT > ).
< P >
Example C09.sample.hold.pd (not pictured here) shows a sample-and-hold unit, another
useful device for doing control tasks in the audio signal domain.
< P >
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Miller Puckette
2006-12-30
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