SSM2005_15 Datasheet, PDF (1/1 Pages) Analog Devices – Circle Surround 5-Channel Soundfield Generator

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Circle Surround 5-Channel
Soundfield Generator
SSM2005
FEATURES
CIRCLE SURROUND SYSTEM BLOCK DIAGRAM
Generates True 5-Channel Soundfield
No Pre-Encoding Required—Only Stereo L and R
Excellent Surround Image At All Positions
Superior Sound in Automobiles
Distinct Left Rear vs. Right Rear, Full Bass Response
No Delay Required—Natural Ambiance Preserved
L
L_{I N}
R
INPUT _L+R
R_{I N}
MATRIX
L–R
L_F
OUTPUT
MATRIX
R_F
VCSs
C
& SWITCHING
L_R
CROSSOVER
L_R
OBSOLETE 4 or 5 Speaker Operation
Full Bandwidth on All Channels
Optimized for Music Reproduction
Superior Decoding of Dolby* Surround Material
Excellent Decoding of "Pre-Encoded" Sources
Usable in Home Theater and Video Games
+7 V to +20 V Operation
GENERAL DESCRIPTION
The SSM2005 Circle Surround^† 5-Channel Soundfield Genera-
tor produces a true 5-channel surround soundfield using only
standard unencoded left/right stereo sources. Left front, right
front, center, and differentiated left and right rear channels are
generated providing a realistic ambiance effect with either 4 or 5
speaker configurations. Unlike previous designs, Circle Sur-
round is optimized for music reproduction with full bandwidth
on all channels and proper separation of the front channels. The
differentiated rear channels provide excellent imaging, especially
TIME
CONSTANTS
L_H
R_H
L_L
STEERING
SIGNAL
R_L
GENERATOR
F
B
SSM2005
STEREO/ _CONTROL
SURROUND
LOGIC
V_SS
V_DD
V_CC
REFERENCE
GENERATOR
REAR
STEERING
WIDE/NORMAL
(DOTTED BOX = EXTERNAL TO IC)
CENTER
PHANTOM
NOISE
SOURCE AND
SEQUENCER
in automotive applications. Listener position is not critical; well-
balanced sound is obtained anywhere within the soundfield.
The Circle Surround process does not require the audio
Y _{signal to be encoded, as it uses the ambiance and directional in-}
AR ^{formation already present in the original media to generate the}
PRTEELCIMHDINNAITCAAL ^{multidimensional effects. Circle Surround does not add any ar-}
tificial ambiance or reverberation, nor does it require any delay
generators. The fully differentiated rear channels provide rear
stereo separation for enhanced spacial perception while main-
taining full bass response, especially important in automotive
applications.
*Dolby is a registered trademark of Dolby Laboratories, Inc.
†Circle Surround is a registered trademark of Rocktron Corporation and
is protected by patents granted and applied for.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Analog Devices assumes no obligation regarding future manufacture unless otherwise agreed to in writing.
To obtain the most recent version or complete data sheet, call our fax retrieval system at 1-800-446-6212 or visit our World Wide Web site at http://www.analog.com.
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