BOSS RSD 10 SERVICE NOTES

Page 2

RSD-10 APR. 1986

CIRCUIT DESCRIPTIONS

Although the RSD»10 has both sampler and delay capa-
bilies, the following description mainly concentrates on
sampler feature, assuming that most of readers are
familar with the basic of digital delay circuit which is
well explained on the service notes of Roland SDE-
1000/3000, BOSS DE-2, etc.

[SAMPLER RECORDING MODE Fig. 1 J

The input audio signal coming into S/H (lCI pins 1 and
3 of Sub board) is passed onto the next stage on a
TRIGGER pulse (RECORDING START, causing COST)
which enables the Main Controller ICQ to start timing
the recording circuits. The trigger pulse is derived from:
Input audio signal proper-in MODE IE (Auto
Recording mode)
or
External control signal (keyboard, pad or peda|)-in
MODE (Manual Recording mode)
Upon receiving a RECORDING START (COST) signal
through Counter Start/Stop Controller (detailed in
COUNTER START/STOP section), the Main Controller
IC9 cordinates the following processes on the audio
input signal. The processing timing being based on the
master clock, which in turn is controlled from Keyboard
Interface. See these sections for detail.

Sample and Hold circuit for extracting an instantane-
ous amplitude of the audio signal

Analog-to-Digital Converter (ADC) for obtaining the
numerical data to the audio amplitude in PCM form.

Storing of the PCM data into the RAMs ICII - ICIB
for later retrieval

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[SAMPLER PLAYBACK MODE Fig. 2 I

There are combinations in sampler playback mode:
modes I, and (TRIG) or (GATE)with dif-
ferent control inputs. Of these variations the following
two combinations are discussed in this section:

MODE (E) with 3 Dynamics keyboard control
MODE .with a Pad or Pedal control

MODL D \.MIII 2: Dymumrzs, Kuyhoarrl Control

A keyboard audio input is converted into the three

signals at the Keyboard Interface (refer to KEYBOARD

INTERFACE for detail).

TRIGGER Pulse

........ Starts sampler playback circuitry (de-
tailed in COUNTER START/ STOP
CONTROLLER)

VOLUME CONTROL Signal

........ Determines the level of the sampled
sound through Dynamic Sensor IC3
(detailed in DYNAMICS SENSOR)

PITCH CONTROL Signal

........ Controls the rate of memory accessing
(and D/A, S/H) timing of the Main
Controller ICQ through the Master Clock
GENERATOR I010. The resultant effect
is a shift of sampled sound pitch.
Also used for PLAYBACK TRIM (de-
tailed in PLAYBACK TRIM section)

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