Harman Kardon TD262 - Page 6

Dolby noise reduction is an extremely effective method of
reducing background hiss on tapes. The TD262 and TD212
incorporate both Dolby B and Dolby C circuitry. Dolby B
reduces tape hiss by about lOdB. Dolby C is approximately
twice as effective as Dolby B, reduces noise over a wider
frequency band and improves overall high-end tape response.
When pressed, the NR (24) button engages the Dolby B & C
noise reduction systems.
The TYPE (25) switch selects the noise reduction system to be
used for recording or playback.
NR BUTTON TYPE BUTTON
RESULTS COMMENTS
OFF
NO EFFECT NR OFF
• For playback of tapes which have not
been encoded with Dolby B or C NR'.
ON
OUT
DOLBY B
• For playback of tapes recorded with
Dolby B 1 2 .
• During recording, encodes the tape in
Dolby B.
ON
IN DOLBY C • For playback of tapes recorded with
Dolby C 3 .
• During recording, encodes a tape in
Dolby C.
1. A Dolby-encoded tape played back without noise reduction
decoding will sound “bright” due to boosted treble
frequencies.
2. A tape which has not been recorded with Dolby NR, will
sound muffled and “dull” when played back with noise
reduction decoding on.
3. Unsatisfactory sound will result if you attempt to play back
a tape recorded in Dolby C while the TYPE button is set to
Dolby B, and vice verse.
This circuit is an input filter which should only be used when
making cassette recordings of FM broadcasts while employing
Dolby B or C noise reduction. Special inaudible signals that
are part of FM stereo broadcasts can interact with Dolby NR to
cause audible interference and distortion which are noticeable
only during playback after it is too late to correct.
Always set the MPX FILTER (26) button to its ON position when
making Dolby-encoded recordings from FM. The circuit has
no effect during playback.
Press this switch to turn the power to your TD262 / TD 212 on.
Press again to turn the power off.
The Harman Kardon TD262 includes special Dolby HX Pro
circuitry. This is NOT a noise reduction circuit. Nor is it a
“record/playback” system which requires separate encode and
decode circuits. Its putpose is to gain even more high
frequency performance out to tapes you record.
Even though your TD262 may be set to the optimum bias for a
tape (using the BIAS/EQUALIZATION and BIAS FINE
TRIM controls), extremely high treble signal levels can still
cause the bias to momentarily overload, causing audible signal
degradation and distortion. Until Dolby HX Pro was devel¬
oped, the only alternative was to reduce overall input signal
levels, which potentially increases signal-to-noise ratios.
*Dolby noise reduction and HX Pro headroom extension manufactured under license from Dolby
Laboratories Licensing Corporation. HX Pro originated by Bang & Oiufsen.
“DOLBY”, the double-D symbol [ jC 1 and “HX PRO" are trademarks of Dolby Laboratories
Licensing Corporation.
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