Description
HA12228F/HA12229F are silicon monolithic bipolar IC providing Dolby noise reduction system*, music sensor, PB equalizer system in one chip.

FEATUREs
• Different type of PB equalizer characteristics selection (120 µs/70 µs) is available with fully electronic control switching built-in.
• Easy interface with the PB head. (The PB-EQ resistance self-containing)
• Changeable to Forward, Reverse-mode for PB head with fully electronic control switching built-in.
• Available to change music sensing level by external resistor.
• Available to change response of music sensor by external capacitor.
• Music sensing level, built-in switch to change a band (MSGV).
• NR ON/OFF fully electronic control switching built-in. (Only HA12228F)
• Line mute control switching built-in.
• Available to connect direct with MPU.
• These ICs are strong for a cellular phone noise.

Functions
• PB equalizer × 2 channel
• Music sensor × 1 channel
• Dolby B-NR (Only HA12228F) × 2 channel
• Line mute SW × 2 channel