Description
The CXA1878Q is a bipolar IC with a built-in Dolby B-C type noise reduction system (NR), Dolby S type select switch, recording/playback equalizer, electronic volume, and bias control circuit.
Use of this IC in combination with two CXA1417S/Q completes a Dolby B-C-S type NR stereo system.

Features
• Dolby B-C type NR
• Built-in filter required for recording/playback equalizer amplifiers
• Recording mute function (requiring only an external time constant circuit to implement soft mute)
• Fade in/out DC controllable
• NORM/CrO2/METAL tape mode switching function
• NORM/HIGH tape speed switching function
• DC controllable for recording level calibration (approximately ±6dB variable)
• DC controllable for high frequency equalizer amplifier gain (approximately ±4dB variable)
• Playback deck A/B select switch
• Recording volume control
• Bias control circuit
• Meter circuit

Applications
    Recording/playback equalizer amplifier for stereo analog cassette decks (Applicable to ALPS ELECTRIC CO., LTD. HADKH55 series heads)