Glossary, Bias calibration, Dolby hx pro system – Sony TC-KA1ESA User Manual

Page 13: Dolby nr inoise reduction) system, Mpx filter, Multi-ams, Recording level calibration, Fet input pb amplifier, Tape counter, Test tones

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Autumatic Selection. The tape deck aulomAticallv iVts

the appropriate equ.'tlization characteristics and bias current

according to the tape type inserted in the deck.

Bias calibration

Adivtstmcntlor optimum recording. You can get belter
Tecordirtg results with minimum distortion and tlM

frequency response by adjusting the bias current to the
appreciate level. Lowering the bias current can boost high-

frequency response, but also cause higher distortion. On the

other hand, raising the bias current con minimize distortion,

but also reduce high-frequency response. To balance both

the bias current and high-frequency response, it is necessary

to adjust the bias current appropriately.

Howet'er, to suit your taste, you can also adjust the bias

current as vou want.

Dolby HX PRO system

DistM’tirm and noise reduction system. The Dolby MX PRO

system reduces distortion and noise in high-frequency

respoase while recording. A tape recorded with this system

brings the some high-quality M>und even when you play the

tape on the other tape decks.

Dolby NR Inoise reduction) system

.Voisv ri\iuctii>n system for eliminating hissing noise. The

Dolby N'R system boosts the liuv-levcl .signals in high

fre^juency during reconting and restores them during T

Tho'e ate 4 types* in the Dolby \R system; A. R, C and S

A-type is for professional use (not available tm this tape

decki, and B. C and S-tvpes are for consumer ctse. S-lype has

the nuiximum noist.' retluction capiibilitv. folttm(*d bv C an*t

MPX filter

Multiplex niter. A Alter for eliminating the ]9-kHz stereo

carrier and the 38-kHz sub-carrier signals that may impair

the Dolby NR system. Usually the tuner has an MPX filter.

If you cannot gel a satisfying result when recording FM

broadcasts with Dolby NR system, your tuner does not have

a hlter or the filter is rtot working. In this case, turn the

DOLBY NR switch countercoickwise to the position you

want (B. C, or S with .MPX FILTER).


Multi-Automatic Music Sensor is a function that locates the

beginning of up to 30 tracks before or after the current track

by detecting a blank spare (of over 4 seconds) between


Recording level calibration

Adjustment for optimum recording. Even when you have

adjusted the recording le\'el correctly, the playing level

might turn out to be low depending on the tape used. By

.idju.«ling the recording level calibration, you can

compensate for the low recording level. When you record

on a tape with the Dolby NR system, this function works

rhore effectively.


FET input PB amplifier

Ibe FI- r input PB amplifier is a l ircuit that is }H*silioned

beuetvn the playing and the op«'rational amplifier.

Unlike conventional amplifier circuits, which requite a low

noise, mi-ilium-quality o|vr.iiionai amplifier of il.s
dinvt link with the playing head, the noise-free .signal that

the I- FI input PR amplifier provid«*s eruibles the* of a
lujUter quality iqs-TAtivMv^l amplifier, .uvl more natural
Nt>undiiig out pot.

Tape counter

A display element that shows the elapsed recording or

playing lime as a digital readout. Since the counter is mu .t

digital ckH-k, the displayed value will differ slightly from

the actual elapsed recording or playing lime. The counter

v.ilue also includi-s the lengtli *U the leader tape.

Test tones

l.^-kHz, t-kHz ami 400-Hz signals produc»\l by the tape
deck when you do the bias and recording level calibration.


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