Audiospektri Guitar Analyser Manual - Halaman 2

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Inputs

guitar in: ¼" jack for connecting the guitar. Use the neck microphone of the guitar;

typically a humbucker mic is more reliable in the note detection than a single coil.

pedal: ¼" jack for guitar effect pedal input. The special effects are adjusted

either by a pedal or the front panel "effect adjust" potentiometer. The pedal is only

activated if it is connected to the module when power is switched on, and the pedal

position is not at zero voltage. Use a pedal that has the output voltage coming from

the tip of the TRS plug. The module feeds its voltage to the ring electrode of the

pedal potentiometer. E.g. the M-Audio effect pedal works when its select switch is

in the "M-Audio" -position.

Outputs

Left: six 3.5mm output jacks for the measured pitch in the 1V/octave format

(default), or alternatively jumper selectable linear voltage output option. The range is

adopted to the guitar frequency scale, so that in the 1V/octave case the note C3

(130.81Hz) corresponds to 1Volt, and the lowest 0.167 Volts corresponds to a drop-

D2 tuned pitch. The maximum 4.8Volts corresponds to the 22

In the linear scale setting, C3 stays at 1V, but then C2 is 0.5V, C4 is 2V, and C5 is

4V. The maximum voltage 4.8V is reached a little above D#5, and the notes

above that will saturate the output. This is because the D/A converter has 12bit

resolution, and a wider span would have resulted too coarse resolution at the low

pitch end. Now it is relatively decent 3 cents. The advantage of the linear scale is the

fact that linear VCO oscillators are much simpler and cheaper than log scale

ones, single chip ones are easy to build even by a beginner hobbyist.

Right: Six 3.5mm output jacks for the synthetic signals that follow the

amplitude and pitch of the analysed separate strings (default), or alternatively the

string amplitudes only, when the effect adjust potentiometer is at its maximum

position. They are DC connected, with a 2.4V offset; therefore the outputs can be

used for modulating other modules that need a positive control voltage between 0

and 4.8 volts.

One 3.5mm jack "out" for composite signal, i.e. all the six synthetic signals summed

together. it is an AC connected low power output to be connected to a power

amplifier input or to the inputs of other modules.

Power

The module uses only the +12V and GND connections of the Eurorack bus, the

current consumption is 150mA maximum.

Controls

pedal effect select: A three position switch that applies the special effect shown at

the right side of the switch individually to each of the synthetic signals that are

generated based on the analysis results of the guitar signal. The base signal is pure

sinewave. See later sections for detailed description of the available effects.

channel allocation method: A three position switch that determines how the

analysis results are output to the six left and right side 3.5mm jacks. See a later

section for detailed description of the available methods.

effect hold: A two position switch that in the "on" position allows stacking of the

effects, i.e. when switching from one effect to another, the remaining controls of the

previous effects at the switching moment are left as they were. Keep it in the "off"

position for outputting of the current effect only.

fret D6 (1174.7Hz).