OVERVIEW
The QS7777PF/CF is an audio processor IC which implements the QSurround™ technology developed and licensed by QSound Labs, Inc. It processes Dolby Digital (AC-3) and Dolby Surround audio signals to produce enhanced virtual 3D sounds, even for 2-speaker systems. It can generate 2, 3, 4, and 5-channel speaker configurations, all with enhanced surround signal outputs.

FEATURES
■ Enhanced surround signal from Dolby Digital (AC-3) and Dolby Surround (ProLogic) input signals
■ 2-step adjustable sound enhancement
■ Supported speaker configurations
• Dolby Digital (AC-3) 6-channel signals to 2, 3, 4, 5-channel speaker QSurround signal configurations
• Dolby Surround (ProLogic) 4-channel signals to 2, 3, 4-channel speaker QSurround signal configurations
■ Monaural to virtual stereo conversion
■ Parallel and 2 serial interface control modes selectable
• QS7777CF: I2C bus 2-wire serial interface1
• QS7777PF: 3-wire serial interface (Data, Clock,
Strobe)
■ 5 to 13V analog supply
■ 4.5 to 5.5V digital supply
■ 48-pin QFP package

APPLICATIONS
■ DVD and laser disk players
■ TV and AV equipment
■ Multimedia products (including sound cards)
■ Car audio