Aiwa AD-6300 Bedienungsanleitung Seite 2

ENGLISH
Thank you very much for purchasing the AIWA
AD-6300.
This set is a full performance component type stereo
cassette tape deck. Before using it, please read these
operating instructions thoroughly in order to correctly
operate and enjoy its many built-in features.
MAIN FEATURES
е Full performance component type equipment.
Control and lever operation, cassette insertion and removal
are all performed from the front panel. This is a true
component type stereo cassette deck.
е Built-in Dolby system reduces annoying hiss noise.
® Peak Indicator
This indicator will light up if input becomes over in recording
and the failures such as the distortion or crack of sound can
be prevented.
е Special position for ferrichrome (Fe-Cr) tape.
Independent 3-position bias and equalizer selectors derive
maximum performance from every kind of tape.
e Input selector switch provides significant SN improvement
during line input recording.
e Cue/Quick Review mechanism
Extremely fast tape program location multiplies operational
ease. Quick review is especially convenient after recording.
е Automatic Stop Mechanism
Functions in all transport modes: RECORD, PLAY, FAST
FORWARD and REWIND. When the end of the tape is
reached, tape is automatically stopped, and all locked control
buttons are released.
TAPE PROPERTIES
Tape can be broadly classified into three types according to
magnetic materials: ferric oxide, chrome, and ferrichrome. Ferric
oxide tape employs y-Fe, O, magnetic material and is usually
referred to as standard (STD or LH) tape.
Chrome tape uses CrO, (chromium dioxide) magnetic material
and possesses several advantages: 1. superior frequency response
2. wide dynamic range with increased output at high frequencies
3. excellent SN ratio 4. clear sound.
On the negative side, however, its differing magnetic properties
do not allow full compatibility with earlier model tape recorders.
Chrome tape also has a tendency to cause more rapid head wear.
Ferrichrome (Fe-Cr) tape combines the features of the above by
using a double layered coating of both materials. The perfor-
mance
advantages of chrome tape become added to the ease of
usage of standard (ferric oxide) tape.
DOLBY SYSTEM
TECHNICAL OUTLINE
The slow tape speed and narrow track width employed in
cassette recording Combine to increase the audibility of annoying
tape hiss noise, This becomes particularly bothersome at low
signal levels. Compensation for this drawback has been achieved
through the development of the Dolby system.
The Dolby system is concerned mainly with middle and high
frequency portions of the signal, which are most prone to
audible hiss noise. When these signal components decline below a
predetermined level, they are enhanced and recorded at higher
than normal level (compression). During playback, the increased
levels are then reduced (expansion). This process provides an
astonishing reduction in hiss noise. In terms of SN ratio,
improvements of 5 dB at 1 kHz and 10 dB over 5 kHz can be
realized.
Frequency Response Characteristic of Dolby Noise- Reduc-
tion System
o
Е: T | f | |
| Dolby characteristics
o
Dolby recording,
Dolby playback
red и m |
T
| TTT
(gp) asuodsay
|
]
NORMAL recording, |
Dolby playback
5000 0000 20000
И |
юо 200 300. #00 2000
0
8
8
8
Frequency (Hz)
Noise Reduction Effect of Dolby Noise Reduction System
Cro, TAPE—
: DOLBY
(8р) asuodsay
Lill
500 0000
L
1000 2000
Frequency (Hz)
MPX (Multiplex) Filter
Carrier signal leakage while recording from FM stereo broadcasts
or CD-4 sources can occasionally cause the Dolby NR circuit to
operate incorrectly. The MPX filter is coupled with the DOLBY
NR switch of this set to eliminate the carrier signal and prevent
this difficulty. Setting the DOLBY NR switch to ON connects
the MPX filter circuit.