HA12157NT

HA12155NT/HA12157NT Audio Signal Processor for Cassette Deck (Dolby B/C-type NR with Recording System) ADE-207-115C (Z) 4th Edition June 1997 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. Functions REC equalizer Dolby B/C NR Electronic volume Level Meter × 2 channel × 2 channel × 2 channel × 2 channel 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 HA12155NT/HA12157NT * Dolby is a trademark of Dolby L...