Specifications

PRODUCT PREVIEW
THX-M
THX Module
Project 779
Promotional Highlights
• Converts DOLBY PRO-LOGIC audio in the C39 and
MX130 to HOME THX AUDIO
• Contains Re-equalization Filters for Left Front,
Center, Right Front, and Surround Channels
• Digital Signal Processing for Decorrelation of the
Surround Channels
• Bypass Switching
• Plug In Module
The second type is for the Surround Channels. As
sounds pan off the screen into the Surround Channels
the timbre changes because the response of the human
ear is different for frontal and side fields. Also, the
various elements of the surround decoder cause
differences in response. The surround equalizer
compensates for all these differences.
DSP DECORRELATION
After passing through the re-equalization filters, the
surround audio is fed to a 16 bit A to D converter. Then
it is split into two channels by means of a decorrelation
process done by the ADSP2105 digital signal processor.
Two 16 bit D to A converters bring the signals back to
analog audio.
BYPASS SWITCHING
FET analog switches are used to switch the THX-M
out of the signal path in other modes of operation.
PLUG IN MODULE
The printed circuit board has 5 connectors that mate
with cables already provided in the C39 and MX130.
It mounts on spacers and replaces a small JUMPER PCB.
HOME THX AUDIO SYSTEM
The HOME THX AUDIO SYSTEM is a licensing
program of LucasArts Entertainment Company, which
defines new technologies and quality standards for
accuracy in home theaters.
Features and Benefits
C39 AND MX 130 CONVERSION
The ThX-M printed circuit board module converts
DOLBY PRO-LOGIC audio to the HOME THX AUDIO
SYSTEM.
RE-EQUALIZATION
Two types of re-equalization are required for HOME
THX.
The first is for the Left Front, Center and Right Front
channels. These three equalizers, all identical, are
designed to compensate from the acoustical differences
between the monitoring environment standards specified
by the Motion Picture Industry and a home audio
system.
Issued by Engineering Department:
December 31, 1992
Manufactured under license from Dolby Laboratories
Licensing Corporation. Additionally licensed under one
or more of the following patents: U.S. number
3,959,590: Canadian numbers 1,004,603 and
1,037,877. "Dolby", "Pro Logic" and the double-D
symbol are trademarks of Dolby Laboratories Licensing
Corporation.
Manufactured under license from Lucas Arts Entertain-
ment Company. Additionally licensed under the
following patent: U.S. number 5,043,970. Foreign
patents pending. Lucasfilm THX Audio and Home ThX
Cinema are trademarks of LucasArts Entertainment
Company. Lucasfilm is a trademark of Lucasfilm Ltd.
MClNTOSH LABORATORY INC., 2 CHAMBERS STREET, BlNGHAMTON, NEW YORK 13903