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.