Description

HA12155NT/HA12157NT is silicon monolithic bipolar IC providing Dolby noise reduction system*, electrical volume system, REC equalizer system and level meter system in one chip.

Features

• Inductor less REC equalizer is adjustable of its characteristics by external resistor

• Rec level is adjustable automatically with electrical volume which is built-in

• 3 type of input selection is available (one is by way of electrical volume)

• Separate input selection SW and REC/PB SW

• Dolby noise reduction with dubbing cassette decks

(Unprocessed signal output available from recording out terminals during PB mode)

• Log-compressed level meter output is range from 0 V to 5 V

(Usable as music search switchable gain of 0 dB and 20 dB respectivily)

• Normal-speed/high-speed (Double), normal/metal/chrome fully electronic control switching built-in

• NR-ON/OFF, Dolby B/C, MPX ON/OFF fully electronic control switching built-in

(Controllable from micro-controller directly)

• Reduction of number of pin by transfered serial data to electronic volume control switching and another

control switching

(Controllable from micro-controller directly)

• Low external parts count