AbouttheDolbynoise-reduction
recording/
playback
system
The Dolby noise-reductionsystem is a system designed to
effectively
reducethe annoyinghigh-frequency
"hissing" noise
typically
heard from tapes if this system is not used. During
recording,the system functionsto increase the level of the
high{requency
part
of thesound,andthen,during
playback,
that
same
portion
isweakenedandreturnedtotheprevious
level.This
unit includestwo types of Dolby noise-reduction
systems,
the
DolbyB NR-typeand C NR{ype, and DolbyHX PRO headroom
extensionsystem.
f Dolby B-typenoise-reductionsystem
Noiseis reducedto about one-third.
Use
thissystem
when
playing
back
tapesrecordedbytheDolbyB
noise-reductionsystem,such as prerecorded
musictapes,etc.
I DolbyC-typenoise-reductionsystem
Noise
is reducedto aboutone-tenth.
Use
thissystemfortherecordingand
playback
ofsoundsources
thathavea
wide
dynamic
range
and
good
tone
quality,
suchas
FM
broadcastsof liveperformances,
etc.,and
forplaying
backsuch
tapes.
t Dolby HX PROheadroomextensionsystem
Byfunctioning
to improve
themaximum
output
level
of thetape's
high{requencyrange,this systempermitsrecordings
without
a
dropof the level
of the soundsource's
high{requencyrange.In
addition,by usingthe systemin parallel
with this unit'snoise-
reduction
system,
recording
andplayback
witha greatly
extended
dynamic
rangeis possible.
Dolby noise reductionand HX P.roheadroom
extension
manufactured under license from Dolby Laboratories
LicensingCorporation.HX Pro originatedby Bang &
Olufsen.
"DOLBY", the double-D
symbol D0 and "HX PRO" are
trademarksof Dolby Laboratories
LicensingCorporation.
Thecounter-modebutton
canbe oressed
to selecteitherof the
counter-display
modes
(see
below):
thetape-counterdisplayorthe
linear-counler
display.
(Note
thatthe linear-counterdisplay
appearswhenthe unitis
turnedON.)
Whenthe counter-resetbutton
is pressed,
"0000"is reset,
regardlessof thesettingof thecounter-modebutton.
I Tape-counterdisplay: This
displayshows
theamount
of tape movementas a series
of consecutive
numbers.
The
displaychangesalternate-
lyeachtimethecounter-mode
buttonis oressed.
I Linear-counterdisplay:This
displayshowsthe
amount
oftapemovement
as
express-
ed minutes
and
seconds.
Minutes Seconds
oThe linear-counter
displayis particularly
convenientwhen you
want
to knowhowmuchtimeisremainingfora tunenow
playing
or you want to know how much recording
time is remaining.
Notesl
.The counterreading
willreturnto "0000"whentheunitisturned
OFF.
oThe linearcounterof this unit does not functionas a clock.
Dependingon the lengthof the tape used,the diameterof the
cassette'shubs,etc.,there
may
bea ditferencebetween
thetime
displayed by the counter and the actual recordingor playback
time.
<Difference
when an ordinarytape is played
on one side
from beginningto end>
Cassettetype Approx.
diflerence
C46
(large
hub),C60,
c90 -30-+30 seconds
C46
(small
hub) +2or3minutes
oThelinear
counter
willdisplaya minus
readingifthe counteris
resetto "0000" and the taDeis then rewound.
Examole:
"-00.01" (linear
counter) Counter
reset:"0000"
Tape
r, -J -t
LI L '_
flt
I I I, C
_, I
I
Rewind
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