MINDPRINT DTC Especificações descarregar pdf (Página 14)

MindPrint-DTC

QUESTION: What roles do the opto-couplers and the

tubes perform in the DTC™?

ANSWER: The opto-coupler compresses in a very

unobtrusive and pleasing way. Since an opto-coupler

is a passive component, it sounds substantially

cleaner than an active semi-conductor circuit. The

tube with its natural form of saturation reliably

handles the limiter function, and is naturally

responsible for the harmonic overtones.

Diagram 1 shows the difference in how a given

signal is compressed with and without

AdaptiveResponse™.

INFO

The opto-coupler consists of a light source and a

light receptor. As the light source, Light-Emitting-

Diodes are used that emit infrared light or red light.

As the light receptors, photo diodes are used.

Diagram 2 shows the spectrum of overtones

generated by the tube. The first-order harmonics and

their relationship to one another are clearly visible.

Diagram 3 shows the audible harmonics of the first

two octaves of the natural overtone scale of C.

INFO

As is the case with a vibrating string, with tube

saturation there is not only the fundamental but also

its harmonic overtones, namely the frequency of the

half-length of the string, the third, the fourth, and so

on. What determines the characteristic sound is the

relative loudness of the harmonics to each other, and

it is the proper mix of these that will decide whether

the character of that sound is perceived as pleasing.

The DTC™ uses 12AX7 tubes driven at 250 volts, and

their circuitry is tweaked in such a way as to

emphasize the uneven overtones (i.e. fifth and major

thirds) and minimize the even, harsh sounding

overtones, which are then less audible.

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MINDPRINT DTC Especificações Página 14