[ASP Microelectronics Ltd.]

Overview
The AP8111 is a bass enhancement processor based on SRS Labs, Inc.’s patented TruBass technology. TruBass is a revolutionary psychoacoustic bass enhancement technology that provides deep, rich bass to small speakers without the need for a subwoofer or additional extra physical components. Deep bass now becomes possible even through speakers with limitations in driver and cabinet design. TruBass circuitry actively monitors the low-frequency content of an audio signal and optimizes the frequency and amplitude spectrum of the output signal to enhance bass perception. For systems with a subwoofer, TruBass complements and enhances bass performance.
TruBass is therefore most suitable for applications that use small size speakers yet need to deliver the best audio quality or home theatre effect: Mini or Micro Stereo Sound Systems, TV, CD, Boombox, Car Audio, DVD Receiver, Set-Top-Box, and other compact hi-fi systems such as Discman, MD, MP3 player, as well as PCs.

Features
● Operating Voltage 4.75V to 5.25V
● Low Operation Current 10mA typ
● Power down and Bypass mode selection
● Analog switch for mode and gain control
● External adjustment for speaker size setting (small, medium and large)
● Bipolar Technology
● Chip Package 28 pins SOP