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4 Adjust BIAS until both meters indicate equal
playback levels.
A high reading on the
upper meter indicates
a low bias current.
A low reading on the
upper meter indicates
a high bias current.
An equal reading on both meters indicates the
optimum bias current condition.
5 Adjust REC LEVEL for calibration until both
meters reach the recommended level.
REC LEVEL
Recommended level
The bias current is now adjusted to the optimum
ievel and the tape sensitivity compensation has
been set. Press MI, then press CALIBRATION
to turn the calibration function off (the display
returns to normal). Rewind the tape and start the
actual recording.
What Is
Iby HX PRO System?
The Dolby HX PRO system provides improved linearity in
high-range frequency response during recording. Tapes
recorded with this system retain the same high quality even
when played back on other tape decks.
High
|
315 Hz
6.3 KHz
Distortion
output
|
\ 40 kHz
Nal
315 Hz distortion
| Bias current ——*
High
Established bias current
As shown above, characteristics such as output level and
distortion differ widely according to the bias (high-frequency)
current.
In conventional systems, the bias current is susceptible to
variations in certain recording signals (see diagram below)
which may cause fluctuations in frequency response,
distortion, or other unwanted characteristics.
High
t
Fluctuation
Output
Frequency
——*
High
With the Dolby HX PRO system, the effective bias amount
added to the bias current is controlled in millisecond units to
greatly reduce distortion, improving linearity in high-range
response and ensuring high-intensity recording with minimal
distortion and noise.
15
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