Tascam 130 - Manual (Page 9)

DOLBY HX PRO Specifications
Dolby HX Pro is an "active bias" technique
that can improve the quality of audio tape
recordings. High-level high frequencies can
be
recorded more accurately, without
sacrificing signal-to-noise ratio, while such
side effects of tape saturation as distortion
are reduced.
What Is Bias?
Bias is a very high-frequency signal generat­
ed within a tape deck and recorded on the
tape simultaneously with the program
material. This inaudible signal allows a low
noise, low distortion recording and flat
frequency response. Different magnetic tape
formulations
require different amounts
of bias for optimum performance. If the
bias
level is too high, high-frequency
Maximum Output Level (MOL) decreases.
The Problem of Self-Bias
Unfortunately, bias level is often influenced
by the signal being recorded. The high fre­
quencies contained in some music act as
bias. This unpredictable source of bias is
added to the existing bias, resulting in a loss
of high-frequency response. As the high-
frequency content of the signal increases.
the ability of the recorder to record high
frequencies (MOL) decreases. This pheno­
menon is called self-biasing.
The Dolby HX Pro Solution
The Dolby HX Pro monitors the high-
frequency content of the program material
and adjusts the recorder bias oscillator to
maintain a constant total bias level. The
result is improved high-frequency response
and lower distortion. Depending on the type
of tape, the improvement in headroom can
be 6 dB or more.
The Benefits
With Dolby HX Pro, it is easier to make
more accurate recordings of tbe kind of
music which contains high-level high fre­
quencies. The improvement is similar to
that of high-performance tape over conven­
tional tape, so regardless of the type of
tape used, the results will sound better.
Most important of all, Dolby HX Pro
requires no decoding process. Once the
tape is recorded with it, the improvements
will be realized when playing the tape back
on any machine.
20Hz 50 100 200 500 1 k 2 5 10 20k
Example of improved frequency response using Dolby HX Pro function
Track System 4-Track, 2-Channel Stereo
Heads 3: 1 Erase, 1 Record and 1
Playback (Combination)
Type of Tape Cassette tape C-60 and C-90
(Philips type)
Tape Speed 4.8 cm/sec. (1-7/8 ips)
Motors 2: 1 DC Servo motor
(for capstan drive)
1 DC motor
(for reel drive)
Wow and Flutter
0.045 % (W. RMS)
Frequency Response (Overall) -20 dB
15 - 21,000 Hz ±3 dB Metal Tape
15 - 20,000 Hz ±3dBCrO, Tape
15 - 18,000 Hz ±3 dB Normal Tape
Signal-to-Noise Ratio (Overall)
60 dB (NR OFF, 3% THD Level,
Weighted)
70 dB (Dolby B In, over 5 kHz)
80 dB (Dolby C In, over 1 kHz)
Fast Winding Time Approximately 90
seconds for C-60
Inputs Line; 97 mV, 50k ohms
Outputs Line; 0.58 V for load impedance
of 50k ohms or more
Headphones; 1 mW/8-ohm load
Power Requirements 120/230 V
AC, 50 - 60 Hz (General export
models)
120 VAC, 60 Hz (U.S.A./Cariada)
230 V AC, 50 Hz (Europe)
240 V AC, 50 Hz (Australia)
Power Consumption 15 W
Dimensions (W x H x D)
483X140 X 289 mm
(19"X 5-1/2" X 11-3/8")
Weight 4.5 kg (9.94 lbs.)
Standard Accessories
Rack mounting screw kit
• Specifications were determined using metal
tape except as noted.
• Improvements may result in specifications
or features changing without notice.
• Photos and illustrations may differ slightly
from production models.
Since this unit incorporates micro­
computers, it may not operate correctly
because of external noise, etc. In such a
case, confirm that the TIMER switch is in
the OFF position, then switch off the
power once for approx, one minute
before restarting operation from the
beginning.
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