intelligent room calibration ? cirrus logic ? has introduced advanced on- chip calibration software that enablesmass-market and high-end a/v receiver and dvd receiver manufacturers to add substantial value to their product offerings. w ith a simple 60-second setup process C half the time of competing solutions Cconsumers can take advantage of built- in intelligent room calibration (irc) software and experience a highly optimized acoustical experience from their home theater system. embedded into cirrus logic s dual-core audio-optimized digital signal processor(dsp) families, the intelligent room calibration (irc) software enables consumers to easily perfect their surround- sound system set-up. cirrus logics irc technology offers a unique algorithmic formula to perform the in-room acoustical adjustments, yielding improved audio quality compared to other automaticacoustic calibration solutions. in fact, by properly balancing out disruptions such as expansive tiled floors, mirrors, heavy carpeting, drapery and other factors that can hinder listening enjoyment, audio enthusiasts will be able to replicate the rich acoustical environment of venues such as state-of-the-art movie theaters and concert halls. new on-chip software optimizes avr system & speaker response for ideal sound experience ? irc allows manufacturers to deliver an adv an ced, h i-v alue feature at a mass-market price-point ? simple end-user setup delivers a highly o ptim ized a cou s tical experience ? ea sy pr ocess a llows users to complete c alibration in 60 seconds C ha lf the time of competing solutions ? t w o unique software algorithms ? i rc level 1 (speaker set-up software) ? irc level 2 (room equalization software) ? highly accurate sound quality and consistency of results when the calibration pr ocess is repeated ? irc is available as an option in cirrus logic fl a gs h ip audio dsps, the cs49500 and cs49400 ? dsp software is self-calibrating and self- co nfiguri ng Cn o co m plicated programming is required ? irc level 1 features ? pre-co m p ensation of microphone frequency response ? de te ction of speaker presence ? detection of speaker size ? sp eaker polarity detection ? distance measurement between speaker an d m icrophone ? sound pressure level measurement of s p ea k ers ? irc level 2 features ? in c lud es a l l i r c le vel 1 features ? au tomatic room-equalization using 7-ban d pa r am e tric equa l izer ? se lf-calibrating and self-configuring dsp soft w a re Cn o co m p l icated microcontroller programming is required ? se lf-equa l iza tio n coefficie n t generation for all sampling frequencies C32 khz, 44.1 khz, 48 khz, 96 khz www.cirrus.com intelligent room calibration in tell i ge n t room calibration (irc) provides a distinct competitive advantage
cirrus logic, inc. 2901 via fortuna austin tx 78746 usa t 512--51--000 ? 800-8-8-5-16 ?f512-85--49-7 product bulletin 0151-1004-pb-lp 2004 cirrus logic, inc. all rights reserved. product information is subject to change without notice. cirrus logic and leading the digital entertainment revolution are trademarks of cirrus logic, inc. other brand and product names may be trademarks or service marks of their respective owners. the cirrus logic irc technology includes two unique software algorithms: irc level 1 (speaker set-up software) and irc level 2 (room equalization software).these algorithms are available as an option in cirrus logics flagship audio dsps, the cs49500 and cs49400. since cirrus logics irc algorithm is running on only one of the two dsp cores on the cs49500 and cs49400 ics, manufacturers can implement this feature without any system hardware changes and thereby differentiate their home theater products against their competition at similar price points. during the speaker-set up process, (irc level 1), the timing of speaker output tothe consumer s primary listening position is optimized. this is important, since multiple speaker placements are typicallynot equidistant to the consumer s favorite couch or recliner. also, the sound pressure level and bass redirection of each speaker are calibrated during this irc level 1 procedure. the irc level 2 set up is designed as a super-set of the irc level 1, which means that it includes all the features of irc level 1 and additional features including a room equalization coefficient capability which compensates for the linear distortion that may occur in the speaker and room configuration. all irc level 2 procedures are handled by the dsp firmware itself, saving designers the hassle of significant microcontroller programming work that is required by other potential solutions. cirrus logics edge in delivering these robust consumer features is the result of the companys focus on digital entertainment technology, as opposed to the general purpose silicon architectures offered by many competitors. intelligent room calibration the irc setup is easy for consumers the 60-second optimization process is quite simple. after setting up home theater equipment that includes cirrus logic intelligent room calibration software, the consumer will hold a microphone, provided by the equipment manufacturer, in the room location where viewing of home mo vies and listening of hi-fidelity audio takes place. with a push of a button on the remote control, the cirrus logic irc software sends tes t s ig n a l s to t he v arious speakers in the room. the microphone captures the test s ig n a l s and makes any necessary ad ju s tm ents to the av r audio commands regarding the distance between speaker and listening position, loudness, and frequency response of audio signals from each speaker. w he n c irrus logic irc level 2 technology (room equalization) is embedded in the processor, the system can be engaged to adjust audio frequencies from each i n dependent channel, providing the user an ultra-high quality stereo or m ultichannel surround-sound experience. irc performance charts dotted line indicates performance before calibration. solid line indicates performance after calibration. 7-band equalizer characteristics after calibration.
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