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Recording
What Is the Dolby 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.
As shown in Fig. EY , characteristics such
as output level and distortion differ widely
according to the bias (high-frequency)
current.
Fig. BY.
a)
High
b)
Distortion output
c)
315Hz
d) 63kHz
e)
10:kHz
f}
315 Hz distortion
9g)
Bias current
h)
High
i)
Established bias current
tn conventional systems (see Fig. Ell ), the
bias current is susceptible to variations in
certain recording signals which may cause
fluctuations in frequency response,
distortion, or other unwanted
characteristics.
Fig. EY.
a)
High
b)
Output
¢c)
Fluctuation
d)
Frequency
e)
High
With the Dolby HX PRO system, the
effective bias amount added to the bias
current is controfied in millisecond units to
greatly reduce distortion, improving linearity
in high-range response and ensuring high-
intensity recording with minimal distortion
and noise.
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