Yamaha Electone CSY-2A Manual - Halaman 6

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Yamaha

is continually striving for

the production

of sound which is

"lively"

and "rich". The CSY-2A

has thus been hailed as a great suc-

cess — it features a new "live sound".

Furthermore,

it incorporates func-

tions by which

this sound can be

freely varied. The synthesizer func-

tion is a new addition, bringing an

even wider range of music to the

fingertips of the performer.

Osea frequency

O G

{interval}

is determined

3] Circuit

which varies the

of tone volume and tone color:

In the synthesizer section of the CSY-2A, all basic tones are

pre-set to solve complex operational problems which often

hamper

the effectiveness of synthesizers.

A system which

allows freedom of variation in tone color, intervals, pre-set

tone volume, and the creation of new sounds is built into the

synthesizer section of the CSY-2A.

The synthesizer is a system to control the oscillator which

generates tones, a filter which affects tone color and an am-

plifier which amplifies tones by voltage. Thanks to the syn-

thesizer, we can

now

control tone color according to time,

control the starting and damping of tones, and freely vary

intervals.

As for the tones of natural instruments such as the trumpet,

violin, etc. which we hear all the time without paying much

attention to, at the points of the tones' beginning, continua-

tion, and decay, the color, interval and volume are subtly

changing. The time required for these changes is not the same

for all instruments, and this time plays an important part in

forming the tone color of each instrument. Therefore, with

the use of the synthesizer tones extremely close to the natu-

ral tones can be created, while in addition completely new

musical sounds can also be created.

To briefly describe the principle of this synthesizer, there is a

voltage-controlled oscillator (VCO), a voltage-controlled filter

(VCF) and a voltage-controlled amplifier (VCA), which are

linked as shown in the diagram below. When a key is pressed,

a certain voltage is generated which affects the VCO to deter-

mine the interval. The signal passed through the VCO enters

the VCF, where tone color is determined. The spacing of the

tone

color changes

is controlled

by signals from another

circuit

(the envelope

generator).

Finally,

amplification

carried out in the VCA. Start, decay and length of sustain are

also determined, and the sound is emitted. Sounds produced

in this way have a natural and vivid feel.

Tone colo

timing