JVC TD-V661 Instructions Manual page 9

DDRP (Dynamics Detection Recording Processor) recording
• DDRP recording is performed with suitable JVC CD players
and the recording level adjustment is performed
automatically.
• Since recording level adjustment is performed automatically
for different types of tape (normal, CrOg and metal), the
adjustment of INPUT LEVEL and BALANCE controls are not
required.
• Read the instruction book of your CD player carefully.
DOLBY NR and DOLBY HX PRO
Dolby NR System
To reduce the hiss inherent in tape recording, use the Dolby NR
System when making recordings. When listening to a tape
recorded with the Dolby NR System, set the DOLBY NR switch
to B or C according to the system selected in the recording
mode.
The sound quality will change if the positions of the DOLBY NR
switch are different in recording and playback.
Dolby HX PRO headroom extension
When a source which contains many high-frequency components
is recorded, these high-frequency signals have the same function
as bias and therefore, the effective bias current changes.
This will result in phenomena such as changes in the level of
low-frequency signal and subsequent distortion and reduction of
the high-frequency saturation level.
Dolby HX PRO headroom extension system controls the bias
current so that the effective bias is constant even when there
are fluctuations in the high-frequency components of the input
signal.
This greatly improves the high-frequency saturation level while
reducing the low-frequency signal level variations and distortion.
• The dynamic sound recorded with this system sounds the
same even when the tape is played back in a deck that does
not have Dolby HX PRO.
• This system automatically works when in recording; however,
Dolby HX PRO is not a noise reduction system.
RECORDING LEVEL ADJUSTMENT
It is best to adjust so that the maximum sound level of the source
to be recorded reaches the very limit of the saturation level of the
tape to be used.
• When the recording level is too low, the hiss noise inherent in
the tape will be conspicuous.
• When the recording level is too high, exceeding the saturation
level, the recording will contain cracking noise and will be
distorted.
• Saturation level means:
When the recording input is increased gradually, the output
increases proportionally. However, once it reaches a certain
level, the output cannot increase any further. Moreover, the
output will be distorted if the input is increased beyond this
point. The level at which this occurs is called the tape's
"saturation level".
Saturation level
Input level—^
How to adjust the recording level
® Set to the source mode (record-pause).
@ Adjust the recording level using the INPUT LEVEL control.
dB indicator for level
compensation (criterion)
With Type IV (metal) tape
Because of metal tape's higher saturation level, it is OK that
"+ 6" lights occasionally.
dB- 30 20 15 12 10 8 6 ovu 2Cno 2 4 6 +8 /
L I i l I I I I I I I I I I 1 [ I I I I I I I I 1^
R CZICZI1^ ^1CZI ^11^ ^1 CZD \
With Type I (normal) or Type II (chrome) tape
It is OK that"+ 2" lights occasionally.
dB- 30 20 15 12 10 8
L
cm czD czi □ 1=1 czi [
R czi = =1 czi =1 =1:
6 ovu 2 □□ 0 2 4 6 +8
Digital Peak Indicator
This is a digital display that shows the recording/playback level
and is interlocked with the peak level meter under the control of
the meter microcomputer. A maximum peak level memory
function is provided so that the peak level can be checked after
as well as during recording.
For 0 dB and under:
o
For +8 dB and over; '
Calling up the maximum level and resetting the memory
When the "DIGITAL PEAK CALL" button is pressed once, the
peak level held in memory flickers in the display for approxi
mately 5 seconds. If the CALL button is pressed again while the
peak value is displayed, the previous contents of memory will be
cleared and this newly input maximum level will be held in
memory as the peak level.
In addition, the digital peak function holds the level of whichever
of the left or right channels is the higher and displays it.