Yamaha S70 XS Посібник - Сторінка 2

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A/D Input and the VOCODER:

The combo jack (XLR and ¼") is a mono (microphone) input. New is that fact that the A/D (or analog-to-

digital) input channel is accessible from the front panel. You have an ON/OFF button and a Gain Control

knob right on the front panel. There is also a row of knobs that let you customize the MIC input: VOLUME,

PAN, CHORUS SEND, and REVERB SEND.

The microphone (A/D Input) can be used normally or it can be used to feed the Vocoder. The A/D Input

must be routed to the VOCODER. Combining the resources of the two Insertion Effects into one "large" effect

processor creates the S90XS/S70XS Vocoder.

In VOICE mode, the Vocoder can be applied to any of the Voices – although the synthesizer provides four

Voices already configured for use with the Vocoder (more in a minute). In the MULTI mode and

PERFORMANCE mode, however, the Vocoder can be applied only to Part 1. This is due to how the

microphone input is routed through the hardware.

It is important to understand how a "vocoder" works to appreciate what you can do with it. Originally

developed to encrypt speech in the limited bandwidths of field radio in the early twentieth century, the

Vocoder has historically morphed from a wartime innovation into a "cool" effect applied in some forms of

music... the so-called "Robot-Voice".

The Vocoder is an effect applied to a synthesizer sound. First, the Vocoder is derived from DSP (Digital

Signal Processing) muscle of a pair of XS Insertion Effects. It is applied to a keyboard instrument (synth)

sound, not to the microphone's input signal. This is a key point to understand. It is not an effect added to

the microphone input... rather the microphone input is fed into to the synthesizer sound and specifically into

the synth Voice's Insertion Effect. It is characteristics extracted from the microphone signal that are used to

alter the synth sound. This difference is key to knowing what is going on and will answer many questions

that may arise later.

Setup for the Vocoder effect takes place inside a VOICE. Therefore when setting up the Vocoder you will

choose a synth Voice to which you apply this Insertion Effect. The richer the synth Voice is in harmonics

and the more noise components it has, the more 'intelligible' the result. Human speech is made up of

vowels and consonants... pitched tones and un-pitched noise components. The microphone here is only

applying certain of the components of your speech to the synth sound. The intelligent human speech is made

up of sustained tones and artful noises. When you sing you mainly sustain the vowel sounds, yet the

consonant 'noises' turn the sustained tones into intelligible sounds. Music is differentiated from noise by the

sustained repeating frequencies, while noises are made up of chaotic frequencies. The sustained tone (pitch)

will be determined by the synth sound (the key you press) the 'artful noises' will be derived from the input

you provide to the microphone. So the pitch is the keyboard, the intelligibility will come from your consonant

sounds picked and filtered by the vocoder.

Selecting an appropriate synth Voice is a key to how good a result you get.

Start from [VOICE] mode

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Press [UTILITY]

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Select "VOICE" > press [ENTER]

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Select "A/D OUT" > press [ENTER] - Here you can assign the A/D INPUT's OUTPUT SELECT

parameter. You can route the output to the "L&R" outputs or an assignable "asL&R" or just the "asL"

or just the "asR" output or to the "vocoder"

•

Highlight the "L&R" and use the DATA WHEEL to change this to "VOCODER"

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If you select VOCODER you will immediately be asked if you want to "Assign Vocoder Voice.

Continue?" > Press [ENTER] to answer YES. You will be shown the four Preset Vocoder Voices (very

cool).

PRE8 125 – Vocoder with Delay

PRE8 126 – Funky Vocoder

PRE8 127 – Vocoder Pad 1

PRE8 128 – Vocoder Pad 2

•

Select one of the four Voices and try out the Vocoder.