Handleiding Marantz Model 5220 (pagina 14 van 21) (Engels)

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BASIC

DOLBY

PROCESS

The

Dolby

system increases

the

level

low

volume

mid-

and high-

frequency

signals

during

recording and reduces the level

these signals by

an identical

amount

during

playback.

As a result,

the

playback

signal is identical

the original

source signal,

but

the

level

background noise

generated by

the

tape recorder is greatly reduced.

Dolbyized

FM broadcast is subjected

the

first

phase

the

noise

reduction

process

before

being transm

itted.

When these signals pass

through

the

Dolby

playback

circuitry,

the

mid-

and high

frequency

noise is greatly reduced.

The

Dolby

Noise

Reduction

System in the Model

5220

can be used

for

recording,

for

playing

back

Dolbyized

cassettes.

The

following

section

will

explain

how

operate

the

Dolby

Noise

Reduction

System in the

5220

process cassettes, FM broadcasts, and external

sources.

CASSETTES

The

Dolby

Noise

Reduction

circuit

in the Model

5220

is designed

for

maximum

convenience when

recording

playing

back a cassette.

The

calibra-

tion

levels have been

internally

preset at

the

factory,

so the

only

adjustment

make is

that

for

recording level.

The

procedure

for

Dolby

recording and

playback

is identical

that

for

non-Dolby

except

that

the

LBY

N R ON pushswitch is depressed

after

the

recording levels are set.

DOLBY

BROADCASTS

Dolbyized

FM broadcasts

contain

Dolbyized

audio

information

which

a special pre-emphasis

applied

for

the

purpose

improving

the noise

reduction

process.

The

pre-emphasis

time

constant

(25jJS) is

different

from

the

used

with

non-

Dolbyized

broadcasts.

properly

recover

the

original program material, a

complementary

time

constant

the

receiver is required. A 25

micro-

second FM de-emphasis

circuit

built

into

the

Marantz Model 112, 125, and

150

stereo FM

tuners and should be activated when recording

. listening

Dolby

FM broadcasts

through

your

Model

5220.

your

present

tuner

does

not

have

such a

circuit,

set

the

DE-EMPHASIS

switch

the

rear panel

the

Model

5220

25jJS

activate

the

corrective

network.

I\IOTE:

you

are using

the

de-emphasis

circuit

built

into

the

tuner,

leave

the

FM DE-

EMPHASIS

switch

the

Model

5220

LAT".

not

use

both

de-emphasis

circuits

simultaneously.

listen

Dolbyized

FM broadcast, proceed

follows:

1. The

tuner

or receiver should be connected

the

LINE

INPUT

jacks.

Apply

the

proper

de-emphasis as

outlined

above.

3. Depress

the

DOLBY

NR ON pushswitch.

4. Depress

the

DOLBY

FM-ON

pushswitch.

The

Dolby

calibration

levels have been

pre-adjusted at

the

factory

and should

not

normally

need

be readjusted when used

with

the

Marantz tuners and receivers equipped

with

"DOLBY

FM"

pushswitches. However,

when used

with

receivers

tuners

not

equipped, FM

calibration

will

be required.

For

this

purpose,

PLAY/FM

CAL

controls

are

provided

on the rear panel. The

controls

should

be adjusted so

that

the

Dolby

reference

tone

transmitted

the

station

the

beginning

Dolby

broadcast registers DO on

the

meters. Once

the

levels are set,

they

not

need

be readjusted unless a

different

tuner

or receiver is connected.

The

decoded

Dolby

FM program can be

monitord

through

the

amplifier

system.

you

are recording

a cassette at

the

same

time,

the

cassette

will

Dolby

encoded

obtain

the

maximum

effect

from

the noise

reduction

process.

NOTE:

When

the

DOLBY

FIVI-ON push

switch

depressed,

the

record

input

level

controls

(the

sliders) are bypassed. The recording

level is

determined

the

PLAY

/ FM

controls.

When

the

controls

are set

properly

using

the

broadcast reference

tone,

the

levels

will

correct

for

Dolby

recording.

EXTERNAL

TAPE

RECORDER

The

Dolby

System in the Model

5220

can be used

as a

Dolby

decoder

for

an external tape deck

not

equipped

with

its

own

Dolby

circuits

the

same

manner as a decoder

for

Dolby

FM broadcasts.

Because

the

dissimilar

playback

level character-

istics

various tape recorders,

PLAY

/FM

CAL

controls

are

provided

the

Model

5220.

The

PLAY/FM

CAL

controls

determine

the

input

sensitivity

the

Dolby

circuit

when

playing

back

Dolbyized

program

from

the

external

unit.

The external tape recorder should be connected

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