Description
HA12141/142NT, HA12170NT, HA12161/162FP are silicon monolithic bipolar IC series providing dual channel Dolby B- and C-type noise reduction* in one chip.

Features
• Low external parts count
• R-C spectrum skewing network using passive component
• External capacitors are E-3 series (small values)
• Several time constant capacitors built into the IC
• Separate REC/PB input and output. Unprocessed signal output available in the encode and decode modes.
• Common PCB pattern is available with HA12134A series (Dolby B NR), because these ICs offer similar pin layout.
• 3 type PB-out level (300 mV, 580 mV, 775 mV)
• 2 type package (DP-30S, FP-28D)
• Wide range of operating supply voltage (7.5 V to 16 V)

Functions
• Dual Dolby B/C-type NR processor
• NR OFF/B/C control switch
• MPX by-pass / Encode / Decode (MPX OFF / REC / PB) control switch
• MPX Filter Drive Circuit