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3.0 OPERATION

3.1

OUTPUT CONTROL

This control sets the amount of fixed gain

the 160X's output stage over

range of ±20

dB.

Fixed gain added or subtracted by the OUTPUT

control from signal passing through the 160X

is not affected by the setting of the THRESHOLD

control. Gain changes brought about when the

input

signal exceeds the THRESHOLD reference

sett ing ·are in

addition

to those ·caused by the

OUTPUT control.

,3.2 THRESHOLD CONTROL

In hard-knee mode this control sets a reference

level

above which

input

signals will be processed

by the 160X's gain change circuitry in the manner

defined by the setting

the RATIO control.

Input

signals which fall below this level will pass

through the 160X unprocessed

(except

for fixed

gain changes directed by the OUTPUT control)

Over Easy mode, signals begin to gradually

activate the 160X's gain change circuitry as they

approach

the THRESHOLD reference level and

they

do not get fully processed in the manner

defined by the RATIO control until they

have

passed

somewhat above the THRESHOLD

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reference level. In Over

Easy

mode there is no

distinct point at which processing begins, and the

THRESHOLD setting corresponds to

point on

the input/output

transfer curve midway between

the onset of processing and that point at which

the transfer curve corresponds to the setting of

the RATIO control

(Figure

~1).

NOTE: The THRESHOLD setting relates to the

signal level

seen by the

DETECTOR input. In

normal operation. the program signal input is

connected directly to the detector input. If this

is not the case, the signal actually present at the

detector input will determine whether and how

the 160X processes the signal coming into its

SIGNAL INPUT.

3.3

RATIO

,C.

O NTROL

When an input signal is above the THRESHOLD

reference level, the setting of this control determines

the number of dB by which the input signal must

change in level to produce a

dB increase in the

signal level at the output of the 160X. A setting

of 2: 1 indicates an input:output

ratio where in a

2 dB increase in input signal (above threshold) will

produce a 1 dB increase in output signal. A setting

oo:

1 indicates that an infinite increase in input

level would

required to

raise

the output level

by 1 dB.

The 160X's RATIO control covers the entire

range from 1: 1 to

oo:

1 and, in addition, goes to

Infinity+ (negative) ratios. At a setting of

-1

the above threshold input signal must

decrease

hy 1 dB in level to

increase

the signal at the

output of the 160X by 1 dB.

The control curve of the RATIO potentiometer

has been designed to provide total operator

control,

with scale expansion at the subtle

lower

ratios for easy

repeatable settings.

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