Description

The HA12226F/HA12227F are silicon monolithic bipolar IC providing Dolby noise reduction system*1, music sensor system, REC equalizer system and each electronic control switch in one chip.

Features

? REC equalizer is very small number of external parts and have 4 types of frequency characteristics built-in.

? 2 types of input for PB, 1 type of input for REC.

? 70μ - PB equalizer changing system built-in.

? Dolby NR*2 with dubbing double cassette decks. Unprocessed signal output available from recording out terminals during PB mode.

? Provide stable music sensor system, available to design music sensing time and level.

? Controllable from direct micro-computer output.

? Bias oscillator control switch built-in.

? NR ON / OFF and REC / PB fully electronic control switching built-in.

? Normal-speed / high-speed, Normal / Crom and PB equalizer fully electronic control switching built-in.

? Available to reduce substrate-area because of high integration and small external parts.

Functions

? Dolby B-NR*2 × 2 channel

? REC equalizer × 2 channel

? Music sensor × 1 channel

? Pass amp. × 2 channel

? Each electronic control switch to change REC equalizer, bias, etc.