valutazioni - 3, GPA: 5
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Facilità d'uso
No part of this publication may be reproduced in any form without prior written permission of ROLAND CORPORATION. PRECAUTIONS AND CONNECTION PRECAUTIONS • Avoid using the synthesizer in very high or low temperature locations. Also keep it away from heaters and coolers since this type of equipment tends to affect circuit and pitch stability. • Avoid using the synthesizer in very dusty or high-humidity places. • If it is necessary to play the synthesizer in an area with neon or fluorescent lamps, keep the synthesizer as far away from these lamps as possible since they will induce high levels of noise. Sometimes, changing the angle of the synthesizer in relation to the lamps wiil help reduce noise. • When connecting the synthesizer, plug the cord into the external amplifier first, then the other end into the SH-1 output. To disconnect, remove the cord from the synthesizer first, then from the amplifier. • To clean the synthesizer, wipe with a cloth dampened with a neutral cleanser. Do not use solvents such as paint thinner. • COMBINING WITH ELECTRONIC ORGAN l i j *Tune to unison with middle C i on the organ. i i When playing an electronic organ in combination with the SH-1, set the units as illustrated above. • CONNECTING TO AMP Connecting the SH-1 to an amplifier. 1 CONTROLS AND BLOCK DIAGRAM -• CONTROLLER (page 8) CONNECTION JACKS (page 5) MODULATOR (page 21 ) ►VCO (page 9} SUB-OSC (page 12) NOISE (page 13) MIXER (page 13) HPF (page 14) ENVELOPE GENERATOR (page 19) VCA (page 18) KEYBOARD (page 7) ■SIMPLIFIED BLOCK DIAGRAM 2 THE ABC’s OF THE SYNTHESIZER ■ BASIC BLOCKS MAKING UP A SYNTHESIZER PITCH, determined by CONTROLLED CONTROLLER LFO VCO /">_r\ —Y~ Г \шм Auto Bend MODULATION SIGNAL OSCILLATOR TONE COLOR determined by VCF -Л-v. Env-1 VOLUME determined by VCA Env-2 W77. OUT D SOUND SIGNAL -». CONTROL VOLTAGE ---> GATE PULSE ■ THE THREE QUALITIES OF SOUND The three qualities of sound are: pitch, tone color, and loudness. Sound is the result of physical vibration in objects. The pitch produced depends on the vibration rate. Fig. 1 shows that the higher the vibration rate, or the higher the frequency.of the vibrations, the higher the pitch is. Frequency is measured in unit called the Hertz (H2}. If a sound source vibrates at a rate of 100 vibrations per second, it is said to have a frequency of 100Hz. The normal human ear can hear sounds with frequencies from about 20Hz to about 16,000Hz. In synthesizers, pitch is controlled by the VCO (Voltage Controlled Oscillator). An oscillator is an electronic circuit which generates a waveform, or in this case, sound. Voltage controlled means that a voltage is used to control the frequency {pitch, in this case) of the oscillator; the higher the voltage, the higher the frequency. This, then, is the first quality of sound: pitch. Fig. 1 shows what are known as sine waves, the simplest mode of vibration. The sound of a sine wave is very clean and pure. Most sound sources vibrate at many frequencies at the same time, however. The lowest of the vibrations, and usually the strongest, is the one which we hear as the musical pitch of the sound source. The presence of these other frequencies is what gives a sound source its second quality: tone color. The frequencies produced by the complex vibrations of a sound source are called harmonics. Harmonics are usually multiples of the pitch frequency. For example, consider a sound source which vibrates so as to produce a pitch with a frequency of 200Hz. The first harmonic would be 200Hz {1 x 200 - 200). The first harmonic is also called the fundamental because this is the frequency which gives the sound its musical pitch. The second harmonic would be 2 x 200, or 400Hz. The third harmonic would be 3 x 200, or 600Hz; the fourth harmonic 4 x 200, or 800Hz, etc. Fig. 2 shows a square wave. Square waves produce a tone colormuchlikethatof aclarinet. Square waves contain only the odd numbered harmonics, or in other words, those frequencies which are one, three, five, nine, etc. times the frequency of the fundamental, or pitch frequency. The even numbered harmonics are missing. Tone color, then, is determined by theharmonic content of the sound; the more harmonics there are, the brighter the tone coior. In the synthesizer, tone color is controlled by the VCF (Voltage Controlled Filter). The VCO produces a basic sound wave rich in harmonics. The VCF is used to remove (or filter out) some of these harmonics thus controlling the harmonic content of The finished sound. The amount of the harmonics removed is controllable by a control voltage. The third quality of sound, loudness, is determined in a synthesizer by the level or amplitude of the waveform, as shown in Fig. 3, and is controlled by the VCA (Voltage Controlled Amplifier). The loudness of a sound changes during its production. Strike a piano key- and the sound jumps the maximum loudness. Hold the key down and the sound ...