OVERVIEW
The QS7785PF/CF is an audio processor IC that generates 2, 4, 5-channel stereo surround signals from 2-channel stereo or mono sources using QSurround™ technology developed and licensed by QSound Labs, Inc.
It can create 2-channel left and right surround effect signal for front speakers, and a rich enhanced surround signal using front speakers and surround speakers for 4-channel output. It also features a center signal output for clear listening of vocal and speech signals.

FEATURES
■ Surround signal output for 2-channel front speakers
■ Surround signal output for 4-channel front + sur round speakers
■ Center speaker output for voice signals
■ Parallel and 2 serial interfaces for mode control supported
   • QS7785CF: I2C bus 2-wire serial interface (Data and Clock)
   • QS7785PF: 3-wire serial interface (Data, Clock and Strobe)
■ 5 to 13V analog supply
■ 4.5 to 5.5V digital supply
■ 48-pin QFP package

APPLICATIONS
■ TV, radio and VCRs
■ Car audio
■ Multimedia products