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. 1 preliminary technical data a circle surround 5-channel soundfield generator ssm2005 features generates true 5-channel soundfield no pre-encoding requiredonly 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 requirednatural ambiance preserved 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 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 signal to be encoded, as it uses the ambiance and directional in- formation already present in the original media to generate the multidimensional effects. circle surround does not add any ar- *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. rev. 0 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. circle surround system block diagram output matrix vcss & switching steering signal generator reference generator l h r h l l r l f b crossover l in r in l f r f c l r l r r l l+r l? input matrix control logic v ss v dd v cc stereo/ surround center phantom rear steering wide/normal time constants (dotted box = external to ic) ssm2005 noise source and sequencer obsolete
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