C32 expander

[bear_1]

Salve .. c'è qualcuno che mi può spiegare bene l'uso dell'espander nel pre C32? 

[GFF1972]

Ciao,

copia ed incolla dal manuale del C32:

”

EXPANDER

The EXPANDER affects both channels of the LISTEN

program line only. The circuit enables you to correct for

the compression that is imposed on most of the program

material available—records, tapes and FM. Compression

is used for many practical reasons but limits the dynamic

range—and, therefore, the realism—of the music. Programs

vary in their need for expansion. Live recordings may not

need any at all. Rotation of the EXPANDER causes the

loudness of the program to be affected logarithmically.

The point at which operation of the expander starts is

selected by the rotary LEVEL MATCH control on the top

panel. The attack speed of the expander is set with the

SPEED switch on the top panel. Settings of FAST, NORM

and SLOW change the attack time of the expander.

As the EXPANDER control is rotated clockwise the circuit

acts in two ways:

1. Loudness is reduced for signals below a predetermined

set level. The farther below set level the program is, the

more the loudness is reduced.

2. Loudness is increased for signals above set level. The

greater the program is above set level, the more the

loudness is increased.

The amount of loudness expansion imposed on incoming

signals is determined by the position of the EXPANDER

control. Clockwise rotation increases the effect. As the

EXPANDER knob is rotated clockwise, undesirable noises

such as hum, scratch and hiss are reduced. The charts

show the action of the EXPANDER CIRCUIT. When rotated

fully counterclockwise, the front panel EXPANDER knob

activates a switch which completely by-passes all EX-

PANDER circuitry.

The LEVEL MATCH control on the top panel of the C 32

adjusts the set level. This is the point above and below

which expansion is introduced when the EXPANDER knob

is turned clockwise. Set the LEVEL MATCH controls for each

channel while listening to a program. Switch the EXPANDER

in and out. The average sound level of the system should be

the same with the EXPANDER knob in the desired position

of EXPANSION as it is in the bypass (OFF) position.

 

A. To reduce noise (hum, hiss or scratch)

1. Select the desired program source with LISTEN front

panel selector switch.

2. Switch top panel SPEED control to NORM.

3. Increase VOLUME control during a quiet passage of

the program until noise is clearly audible.

4. Rotate EXPANDER control clockwise until the noise

is acceptably reduced.

5. Adjust the LEVEL MATCH controls.

B. To improve the "live" sound of recorded or transmitted

program material:

1. Select LISTEN input.

2. Switch top panel SPEED control to NORM.

3. Increase VOLUME to satisfactory level.

4. Rotate the EXPANDER control clockwise until the

dynamic range of the music, the ratio of loud to soft

is correct for you.

5. Adjust the LEVEL MATCH controls as described pre-

viously.

By using the EXPANDER controls in conjunction with the

EQUALIZER FREQUENCY controls, the C 32 may be used

to de-emphasize and decompress disc and tape program

material.“

 

Ciao,

Gianluca

 

 

 

[GFF1972]

In pratica, è uno strumento utilizzato per eliminare/attenuare dal segnale audio i rumori di fondo non causati dalla sorgente.

 

[bear_1]

@GFF1972 .......👌......👋