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ASP

AP8111

PRELIMINARY

TruBass Audio Enhancement Processor

1 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.

2 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

The TruBass technology rights in the AP8111 are owned by SRS Labs, a United States. Corporation and licensed to ASP

Microelectronics Ltd. TruBass is protected under US and foreign patents issues and/or pending. TruBass and the

symbol

are trademarks of SRS Labs, Inc. in the United State and selected foreign countries. Neither the purchase of the AP8111, nor the

corresponding sale of audio enhancement equipment conveys the right to sell commercialized recordings made with any SRS

technology. SRS Labs requires all set makers to comply with all rules and regulations as outlined in the SRS Trademark Usage

Manual separately provided.

For further information, please contact:

SRS Labs, Inc.

2909 Daimler Street, Santa Ana, CA 92705 USA

Tel: 949-442-1070

Fax: 949-852-1099

http://www.srslabs.com

[CAUTION]

The information in this publication is believed

to be accurate in all respects at the time of

publication but is subject to change without

notice. ASP Microelectronics Ltd. assumes no

responsibility for errors and omissions, and

disclaims responsibility for any consequences

resulting from the use of information included

herein. Additionally, ASP Microelectronics Ltd.

assumes no responsibility for the functioning of

undocumented features or parameters.

ASP Microelectronics Ltd.

Unit 218, 2/F., Tech Centre,

72 Tat Chee Ave., Kowloon Tong, Hong Kong

Tel:(852) 2797 3288

Fax: (852) 2797 3112

http://www.asp.com.hk

Revision 2.4

15 April., 2002

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