Inhaltsverzeichnis
Werbung
Analog Physical Modeling Synthesis and
the PLG150-AN Tone Generator
As the PLG150-AN Tone Generator Block Diagram (page 7) illustrates, the VCO module generates
the basic signal, then passes it along the signal path to the MIXER and VCF modules, processing
the signal in a variety of ways before passing it on to the VCA module, which controls the volume of
the signal — before passing it along to be processed (by Distortion and 3-BandEQ) along with the
other Parts of the tone generator. Along the way, various real-time and other controllers can be
applied to each module in a variety of ways, providing enormous sound-shaping and sound-creating
possibilities.
Some of the parameters mentioned in the following explanations cannot be accessed from the "mother" device;
however, they can be controlled with the special AN Easy Editor and AN Expert Editor plug-in software modules
(used in XGworks or XGworks lite). Even without the use of the plug-in software, the original AN voices of the
PLG150-AN provide enormous sonic complexity and flexibility, especially with the use of the Part parameters and
the AN Assignable Controllers on the "mother" device.
Oscillators, Filters And Amplifiers
What does it take to make a sound? And how does the PLG150-AN generate sounds?
In the simplest of terms, there are three basic elements which make up a sound: pitch, or how low or high it
is; tone, or what its overall quality, or timbre is like; and amplitude, or how loud the volume level is.
Synthesizers rely on three key electronic components to generate sounds and electronically imitate the
soundwaves of familiar musical instruments, as well as create entirely unique sounds. In traditional analog
synthesis, the source sound pitch and waveform is generated by an oscillator; its tone is controlled by a fil-
ter; and its volume is determined by an amplifier. With the PLG150-AN, these three elements are termed
the VCO (voltage controlled oscillator), the VCF (voltage controlled filter), and the VCA (voltage con-
trolled amplifier).
The "signal path" starts at the VCO, flows to the VCF, then flows to the VCA. The signal is "processed" at
each block, or "module" along the way to the final output.
6
VCO
VCF
VCA
The amplifier determines the volume
The filter controls the timbre
The oscillator creates the source pitch
(and also the basic timbre, depending on the waveform)
OUT
Werbung
Inhaltsverzeichnis
