Denon DN-780R User Manual download pdf (Page 12)

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DOLBY B AND C NOISE REDUCTION SYSTEM

2 The Dolby noise reduction system substantially

reduces the tape background noise (hiss) inherent

in the cassette medium. Dolby B NR is most

widely in use. However Dolby C NR is a much

more recent development and represents

significant improvements over Dolby B NR.

2 Tape background noise consists primarily of high

frequency information, which is particularly

annoying during soft passages. The Dolby NR

system increases the level of low volume mid-

and high-frequency signals during recording and

reduces the level of these signals by an identical

amount during playback. As a result, the playback

signal is identical to the original source, but the

level of background noise generated by the tape is

greatly reduced.

2 The operating principle of Dolby C NR is similar to

that of Dolby B NR except for the encoding

/decoding response curves. The noise reduction

effect obtained with Dolby C NR is up to 20 dB,

compared to 10 dB with Dolby B NR. In addition,

Dolby C NR uses an anti-saturation network and

spectral skewing circuitry for a significant

improvement in the dynamic range of the mid- to

high-frequencies.

DOLBY HX-PRO HEADROOM EXTENSION SYSTEM

This deck is equipped with the Dolby HX-PRO

headroom extension system. Since the system

functions automatically during recording, no switching

operation or adjustment is required. The system is

effective with any type of Normal, CrO

and Metal

tape.

The Dolby HX-PRO headroom extension system

functions during recording to raise the saturation level

in the treble range. Therefore, most of the treble

range components distorted or lost during recording

on conventional cassette decks are more faithfully

recorded on the new DENON cassette deck.

Features of the Dolby HX-PRO Headroom

Extension System

(1) Performance of Normal and CrO

2 tapes can be

improved to very close of that offered by Metal

tape.

(2) The dynamics in the treble range are improved

significantly.

(3) Since no decoding is necessary during playback,

the improved sound can be enjoyed on any type of

tape deck, including portable players and car audio

systems.

(4) The system functions whether the Dolby B/C NR

system is engaged or not.

MAINTENANCE

2 Head cleaning

After long usage, tape coating or dust may adhere

to the heads, causing deterioration of sound.

Therefore, the parts depicted in the illustration

should be cleaned regularly. Use a cotton swab

moistened with a tape head cleaning solution

(such as alcohol).

NOTES :

1. Some cleaning cassettes on the market have a

strong abrasive effects and may scratch the

heads. Always use cotton swabs instead of

cleaning cassettes.

2. Since the use of metal tape is apt to collect

more dust on the heads, the heads should be

cleaned more often to enjoy the best possible

sound.

2 Cleaning the Pinch Rollers and Capstans

If the pinch rollers or capstans accumulate dust,

tape transport may become unstable, as a result

from slippage, during recording or playback. The

tape can also be damaged if it gets entangled in

the capstan.

Clean these parts with a cotton swab or a soft

cloth moistened with a tape head cleaning solution

(such as alcohol).

2 Demagnetizing the Heads

The heads will become magnetized after long

usage or if strongly magnetized objects are

brought near them. The result is a generation of

noise, loss of the high frequency range, and in

extreme cases erasure of treble components on

pre-recorded tapes in combination with added

noise.

Thus, the heads should be demagnetized at regular

intervals. (Head demagnetizers are separately

available from your dealer.)

2 How to Demagnetize the Tape Heads

1. Turn off the power.

2. Turn on the demagnetizer while it is at least 30

cm away from the heads. Bring the demagnetizer

near the heads and slowly move it in small

circles four or five times in front of each head,

making sure you do not touch them.

3. Slowly move the demagnetizer away and turn

it off when it is at least 30 cm away from the

heads.

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Denon DN-780R User Manual Page 12

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