Sony TC-K890ES - To Protect & Recopding; What Is the Dolby HX PRO System

SSeS
To protect a recording on side A or B
Break out the respective tab.
Side A
To recover a cassette for recording
Cover the respective slot with tape.
When using Type Il (CrO2) or Type IV (metal) cassettes
Be careful not to cover the detector slots which are
necessary for automatic tape detection.
Type IV (metal)
Type Il (CrO2)
Detector slots Detector slots
Cassette care
¢ Avoid touching the tape surface of a cassette to prevent
contamination of the heads by dirt, dust, or oil on the skin.
¢ Keep cassettes away from equipment with magnets, such
as speakers and amplifiers, as erasure or distortion on the
recorded tape could occur.
¢ Do not expose cassettes to direct sunlight, extremely cold
temperatures or moisture.
Note on cassettes longer than 90 minutes
The use of cassettes longer than 90 minutes is not
recommended except for long continuous playback.
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 below, characteristics such as output level and
distortion differ widely according to the bias (high-frequency)
current.
315 Hz
|
Distortion
output
6.3 kHz
oe.
\
i * 10 kHz
31g Hz distortion
Bias current ——* High
- Established bias current
In conventional systems (see diagram below), the bias
current is susceptible to variations in certain recording
signals which may cause fluctuations in frequency response,
distortion, or other unwanted characteristics.
High
{ ~ 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.
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