DOCSLIB.ORG

Orban FMX Brochure

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Orban FMX Brochure www.SteamPoweredRadio.Com July 10, 1986 Dear Broadcaster: Thank you very much for your interest in OPTIMOD-FMX. Enclosed is a package of information from both Orban and CBS. I ' m sure you will find it interesting. In our articles, we explain why the Orban OPTIMOD- FMX will be substantially different and better than units offering only the CBS "developmental" design. Until IC chips become available, FMX receivers will be very scarce. The latest information from CBS is that the first chips will roll off the line during the summer of 1987 , permitting receivers to be available just prior to Christmas 1987 . Orban expects to begin accepting orders for OPTIMOD- FMX in the Fall, with deliveries beginning late i n the year. As we have more information available, we will s end it to you. If you have any additional questions, feel free to call me on our toll- free number: 800- 227- 4498. Thank you for your confidence in OPTIMOD- FMX . Best regards , Howard Mullinack Marketing and Sales Manager Br oadcast Products www.SteamPoweredRadio.Com Orban Associates Inc. 645 Bryant Street San Francisco, CA 94107-1693 Main: (415) 957-1063 (Sales): (415) 957-1067 Telex: 17-1480 Cable: ORBANAUDIO Highlights D Increases stereo coverage area-to almost The Model 8150A OPTIMOD-FMX is a complete, that of the mono coverage area- self-contained stereo generator. It combines a newly­ for receivers equipped with FMX designed ultra-high-performance stereo encoder with the Orban FMX compander and subcarrier generator, decoders. including remote control facilities and an integral power D Fully compatible with non-FMX equipped supply. receivers. It installs directly below OPTIMOD-FM Models 8000A, 8100A, and 8100A/1, and can work with the □ Orban's proprietary program-dependent Studio Chassis and/ or XT Six-Band Limiter. Your FMX control circuitry achieves optimum current OPTIMOD can be easily adapted for FMX. Just noise reduction without danger of add an easy-to-install interface connector. And OPTIMOD-FMX can be used with nearly any audio overmodulation. processor that offers a peak-controlled output signal □ Works with OPTIMOD-FM of any tightly bandlimited to 15kHz and has output vintage, and some other audio attenuators. processors. As development and on-air testing continues, O rban will release further progress information. D Projected delivery: Late Fall 1986. o,ban Orban Associates Inc. 645 Bryant Street, San Francisco, CA 94107 (800) 227-4498 or (415) 957-1067 Telex 17-1480 OPTIMOD" is• registtred trademark of Orban Assoclatts Inc. FMX t M. is a registfftd trademark of CBS. Inc. ORBAN OPTIMOD-FMX 800038-000-02www.Stea 5186mPoweredRadio.Com ORBAN TECHNICAL NOTES ON FMX - #1 by Howard Mullinack FMX improves stereo coverage The advantages of FMX become less and less apparent as more processing ls FM stereo reception suffers Crom slgnlficanlly increased noise as compared used to load the composite more and more heavily. If the composite always to mono reception-typically 23 to 26dB. This noise Increase restricts the looks like It has been shaved with a buzzsaw, there won't be any room for coverage area of acceptable stereo reception to approxlmately one-fourth the the added subcarrier. The FMX compressor will stay In its "reentrant mode" coverage area of acceptable mono reception. FMX was developed by CBS much of the time, and little or no noise reduction will be avalJable (except Technology Center and the National Association of Broadcasters in an attempt possibly when the announcer pauses for air). Of course, with high modula­ to solve this problem. tion levels, the noise will be somewhat less apparent. Stations equlpped with FMX can increase their stereo coverage area-up to OPTIMOD-FMX-our approach about that of their mono coverage area-for lbose receivers equipped wilb It's dear that the design of a " real-world" FMX compressor ls quite a com­ P!tfX decoders. Yet FMX broadcasts are completely compatible with non-FMX plex endeavor. FMX encoders will be highly differentiated according to the receivers, which will continue to receive stereo or mono normally. skllls of the various manufacturers. How FMX works At Orban, four goals FMX ls a compandlng system: The L-R audio (which ls the source of the were foremost In the noise increase in stereo) is compressed before transmlsslon and expanded at design of the OmMOD­ the receiver. FMX Stereo Generator: (1 ) OPTIMOD-FMX : To assure compatabiUty with existing radios, the L-R stereo subcarrier Is It cannot produce over­ transmltted at 38kHz in the normal manner. In addition, a second L-R subcar­ modulatlon; (2) the on-alr AN INTRODUCTION rier (the FMX subcarrier) is transmltted at the same frequency In quadrature sound must not suffer from audible loss of (90° out of phase) with the original subcarrler. The FMX subcarrler Is com­ pressed, and Includes a JOHz pilot tone. loudness; (3) compression characteristics that produce audible processing artifacts will not be accept­ In the FMX-equlpped receiver, both the "original L-R" and "FMX" subcar­ able; and (4) the design must not degrade SCA performance. riers are detected. The receiver sums the "original L-R" and " FMX" signal, and then expands the audio on this sum to match the dynamlcs of the Real-world on-alr testing "original L-R" audio. Since the receiver uses the "original L-R" as a ref­ So far, FMX has been on-air tested by CBS at only a few "public" stations erence, it can accurately reconstruct the FMX signal without the FMX using very conservative processing. We feel that If FMX ls to be successful, it generator's having to maintain precisely defined compression characteristics. must work with all types of formats and processing preferences, with various This Is called " adaptive expansion": the expander adapts to match a wide exciters and STI.s, and on stations with and without SCA. It must not variety of compression characteristics. significantly increase the deleterious effects of multipath. The noise reduction Is achieved when the FMX L-R audio Is expanded: low If FMX encoders are released prematurely, without thorough research of level signals, and the noise, are reduced in level. Typically, up to 20dB of potential drawbacks and extensive on-air testing to assure that those draw­ noise reduction can be achieved. backs are overcome, FMX will be doomed to failure. First impressions are lasting impressions. We are now beginning our own series of extensive on-air FMX compression characteristics vs. "real-world" radio tests. CBS, In their design of FMX, Introduced a "developmental" compressor to permlt initial field trials and to prove the basic FMX principles. But the com­ Availability of FMX receivers pression characteristics of this " developmental" compressor are not ap­ IC manufacturers are just starting development of FMX decoder chips, so plicable to many stations. Fortunately, " adaptive expansion" allows Orban to receivers for the mass market will not be available before mld-1987. Two optimlze the compressor characteristics of FMX while maintaining full high-end hl-fi manufacturers, NAO and Apt, expect to have a limlted supply of recovery of the original signal on standard and FMX-equipped receivers. receivers available later this year, with FMX implemented using discrete circuitry. The first area of concern In the design of the OPTIMOD-FMX compressor is ovemwduJaffon. Under certain sound field conditions, the CBS Availability of OPTIMOD-FMX "developmental" compressor can create continuous overmodulation-not Orban may be first to market, but only If we have a finely tuned product just overshoots-of up to 26 % . that will satisfy the needs of our customers. The necessary design and field testing must be done carefulJy, and wllJ take some time. Another factor ls loudness and audio processing. The FMX system adds an additional subcarrier (and additional modulation) 10 the composite signal. Normally, modulation must be reduced to accommodate an additional subcar­ rier. The CBS " developmental" compressor has a reentrant characteristic: As the level of the "original L--R" subcarrler increases toward 100 % modula­ tion, the level of the " nlX" subcarrier decreases. With full modulation of the • OfTIJIOO Is ■ r,gblttl'd lrtdetrwll of Orlwl Assodsl,s Inc. 00 Is ■ r,gtsleml 1..itmvt ol CBS In(, "original" L-R subcarrler, the "FMX" subcarrler actually disappears, with all Orban Associates Inc., 645 Bryant Street, San Francisco, CA 94107 of the benefits of f/llX disappearing with lt. (800) 227-4498 or (415) 957-1067 Telex 17-1480 o,ban 920008-000-01 5186 www.SteamPoweredRadio.Com ORBAN TECHNICAL NOTES ON FMX - #2 by Robert Orban FMX111 ls an FM stereo compandiog system which offers up to 20dB noise reduc­ ponents. OPTIMOD-FMX Is designed to plug directly Into an OPTIMOD-FM of any tion In stereo mode, yet Is compatible with exlstlng receivers. Developed jointly by vintage (Including the old 8000A) and to operate without further adjustment Emil Torick of CBS Technology and Tom Keller or NAB, It promises the first funda­ OPTIMOD-FMX can also mental Improvement In FM stereo technology since the system was approved almost be used with nearly any 25 years ago. audio processor equipped Nevertheless, to assure the success of FMX In the mass market, there are a with output attenuator con­ number of potential pitfalls which must be addressed. Some of these Include over­ trols, and with a peak­ modulation control, noise modulation effects, multipath distortion, system perfor­ controlled output signal mance In the automotive environment, and the effects of audio processing. Orban is that Is tightly bandlimlted taking all of these Imo account In the development of our FMX generator. to 15kHz. (Older FM peak Thanks to the novel concept or "adaptive expansion" In th.e receiver, an FMX llmlters manufactured by receiver can adapt to a wide variety of transmission compression characteristics.
Load more

Recommended publications
  • Fmx480 Digiplexer User's Manual
    FMX480 DIGIPLEXER USER’S MANUAL Date: 08/07 Navigator ® and AUDEMAT-AZTEC ® are registered trademarks of AUDEMAT-AZTEC Company. Audemat-Aztec SA – Audemat-Aztec INC WEB: www.audemat-aztec.com - e-mail: [email protected] Page 1 CONTENTS 1. INTRODUCTION............................................................................................................................................. 6 1.1 GENERAL INFORMATION ............................................................................................................................ 6 1.1.1 About Audemat-Aztec............................................................................................................................. 6 1.1.2 About RDS.............................................................................................................................................. 6 1.1.3 About FMX 480...................................................................................................................................... 6 1.2 BEFORE STARTING.......................................................................................................................................... 7 2. PRODUCT PRESENTATION ........................................................................................................................ 8 2.1 LIST OF INCLUDED ACCESSORIES ............................................................................................................... 8 2.2 GENERAL SPECIFICATIONS OF THE FMX480.............................................................................................
    [Show full text]
  • A Theoretical and Experimental Study of Noise and Distortion in the Reception of Fm Signals
    A THEORETICAL AND EXPERIMENTAL STUDY OF NOISE AND DISTORTION IN THE RECEPTION OF FM SIGNALS Dr. Amar G. Bose Dr. William R. Short Professor of Electrical Engineering Research Staff, and Computer Science, M.I.T. Bose Corporation Presented at M.I.T. Jan. 25, 1989 Copyright ® 1989 Massachusetts Institute of Technology, Cambridge, MA 02139. Abstract A mathematical model is developed that can be used to analyze the effects of multipath on any modulation of an FM carrier. The predictions of this model are verified by simulation and by actual field testing. The model is used to analyze the existing FM stereo system and the proposed FMX system. The analysis, confirmed by field tests in over 15,000 locations, shows that FMX transmission significantly degrades reception on existing FM stereo receivers and that FMX receivers are inferior to FM stereo receivers for receiving FMX transmissions. i Table of Contents 1.0 Introduction 1 2.0 Objectives 1 3.0 The Multipath Model 1 3.1 Derivation of Error Due to Multipath 2 3.2 Observations from Examination of the Frequency Error 6 3.3 The Generation of Quadrature Modulation Signals by Multipath 8 3.4 Effects of Multipath on Phasing Errors in the Decoding of the 38 kHz Subcarrier 9 4.0 Quantitative Examination of Multipath-generated Errors in the Time and Frequency Domains 11 4.1 Review of FM Stereo and FMX 11 4.2 Multipath 14 4.3 Review of Effects Due to Multipath 16 4.4 Review of Factors Affecting Multipath 17 4.5 Multipath and FMX 19 4.6 Over the Air Experiments 26 4.7 Analysis of Data 37 5.0 Summary 44 6.0 References 45 i1 Acknowledgements The authors wish to acknowledge the following people who have contributed to this study through either discussions, experimental work, or preparation of the final doc- ument.
    [Show full text]
  • Audio Engineering & Production
    Audio Engineering & Production FMX Broadcasting without overmodulation," Orban explains. The Optimod FMX generator is a standalonestereo generator with an FMX compressor that is designed to plug directly into Orban's FM processing and is opti- mized for the Optimod-FM 8100 and older 8000 models. But Orban says it can also be interfaced to other manufacturers' processing as long as there's an effective low- pass filter and peak limiting. Orban is continuing to test the system to see how it works in the presence of processing and to de- termine any multipath problems that might exist. A product will be available late this year or early Figure 4: "A" is the normal stereo subcarrier, "B" is the same L- R information next year, with pricing in the with the 20 dB FMX gain and flattop compression characteristic. Subtracting "A" $3000 range. from "B" results in "C," which modulates the FMX subcarrier in the CBS design. Aphex is also interested in mar- Inovonics' feedforward pulse -width modulation results in "D," a softer com- keting an FMX product. The com- pression curve. pany was contemplating entering pressed FMX signal is 20 dB, but itable FMX thatwillhave the FM stereo generator field and will be up to individual manufac-selectable preemphasis and 15 decided after researching the mar- turers to determine the time con- kHz low-pass filters to be compati- ket that any new offering should stants of the compression and theble with other manufacturers' pro- be prepared for the future by final shape of the re-entrant char-cessing. CRL anticipates that an incorporating the FMX system.
    [Show full text]
  • Fmx480 Digiplexer User's Manual
    FMX480 DIGIPLEXER USER’S MANUAL Date: 08/07 Navigator ® and AUDEMAT-AZTEC ® are registered trademarks of AUDEMAT-AZTEC Company. Audemat-Aztec SA – Audemat-Aztec INC WEB: www.audemat-aztec.com - e-mail: [email protected] Page 1 CONTENTS 1. INTRODUCTION............................................................................................................................................. 6 1.1 GENERAL INFORMATION ............................................................................................................................ 6 1.1.1 About Audemat-Aztec............................................................................................................................. 6 1.1.2 About RDS.............................................................................................................................................. 6 1.1.3 About FMX 480...................................................................................................................................... 6 1.2 BEFORE STARTING.......................................................................................................................................... 7 2. PRODUCT PRESENTATION ........................................................................................................................ 8 2.1 LIST OF INCLUDED ACCESSORIES ............................................................................................................... 8 2.2 GENERAL SPECIFICATIONS OF THE FMX480.............................................................................................
    [Show full text]
  • Transmission
    H04B TRANSMISSION (transmission systems for measured values, control or similar signals G08C; coding, decoding, code conversion, in general H03M; broadcast communication H04H; multiplex systems H04J; secret communication H04K; transmission of digital information H04L; wireless communication networks H04W) Definition statement This subclass/group covers: The transmission of information carrying signals, the transmission being independent of the nature of the information. Monitoring and testing arrangements and the suppression and limitation of noise and interference. The user is referred to the IPC definitions of individual main groups of subclass H04B: Transmission systems characterised by the waveband used for transmission: Radio waves - see definition for main group H04B 7/00. Light, infrared waves or corpuscular radiation - see definition for main group H04B 10/00. Ultrasonic, sonic or infrasonic waves - see definition for main group H04B 11/00. Transmission systems characterised by the medium used for transmission: Conductors - see definition for main group H04B 3/00. Free-space propagation - see definition for main groups H04B 5/00 H04B 7/00 H04B 10/00 H04B 11/00. Earth, water or body - see definition for main group H04B 13/00. Transmission systems characterised by the carrier modulation used for transmission: Pulse modulation - see definition for main group H04B 14/00. Relationship between large subject matter areas If the transmission systems are specially adapted for particular applications classification is also made in subclasses
    [Show full text]
  • Broadcasting Surround Sound Audio Over IBOC Digital Radio – Issues and Resources for FM Broadcasters January 10, 2007
    NRSC REPORT NATIONAL RADIO SYSTEMS COMMITTEE NRSC-R207 Broadcasting Surround Sound Audio Over IBOC Digital Radio – Issues and Resources for FM Broadcasters January 10, 2007 NAB: 1771 N Street, N.W. CEA: 1919 South Eads Street Washington, DC 20036 Arlington, VA 22202 Tel: (202) 429-5356 Fax: (202) 775-4981 Tel: (703) 907-7660 Fax: (703) 907-8113 Co-sponsored by the Consumer Electronics Association and the National Association of Broadcasters http://www.nrscstandards.org NRSC-R207 NOTICE NRSC Standards, Guidelines, Reports and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Guidelines, Reports and other technical publications shall not in any respect preclude any member or nonmember of the Consumer Electronics Association (CEA) or the National Association of Broadcasters (NAB) from manufacturing or selling products not conforming to such Standards, Guidelines, Reports and other technical publications, nor shall the existence of such Standards, Guidelines, Reports and other technical publications preclude their voluntary use by those other than CEA or NAB members, whether to be used either domestically or internationally. Standards, Guidelines, Reports and other technical publications are adopted by the NRSC in accordance with the NRSC patent policy. By such action, CEA and NAB do not assume any liability to any patent owner, nor do they assume any obligation whatever to parties adopting the Standard, Guideline, Report or other technical publication. This Guideline does not purport to address all safety problems associated with its use or all applicable regulatory requirements.
    [Show full text]
  • Communication Count Maht That
    COMMUNICATIONUS009877132B2 COUNT MAHT THAT THE (12 ) United States Patent ( 10 ) Patent No. : US 9 , 877 , 132 B2 Engdegard et al. ( 45 ) Date of Patent: * Jan . 23 , 2018 ( 54 ) AUDIO SIGNAL OF AN FM STEREO RADIO ( 58 ) Field of Classification Search RECEIVER BY USING PARAMETRIC CPC .. HO4S 1 / 00 ; H04S 1 /007 ; H04S 3 /00 ; H04S STEREO 5 /00 ; H04S 2420 / 03 ; H04H 40 / 45 ; HO4H 40 /72 ; H04H 40 /81 ; G1OL 19 /008 (71 ) Applicant: DOLBY INTERNATIONAL AB , (Continued ) Amsterdam Zuidoost (NL ) References Cited (72 ) Inventors : Jonas Engdegard , Stockholm ( SE ) ; ( 56 ) Heiko Purnhagen , Sundbyberg ( SE ) ; U . S . PATENT DOCUMENTS Karl Jonas Roeden , Solna ( SE ) 3 , 823 , 268 A 7 / 1974 Modafferi S(73 ) Assignee : Dolby International AB , Amsterdam 4 ,390 ,749 A 6 / 1983 Pearson (NL ) (Continued ) ( * ) Notice : Subject to any disclaimer, the term of this FOREIGN PATENT DOCUMENTS patent is extended or adjusted under 35 CN 1748247 A 3 /2006 U . S . C . 154 (b ) by 494 days . CN 1758337 A 4 / 2006 . This patent is subject to a terminal dis (Continued ) claimer. OTHER PUBLICATIONS (21 ) Appl . No. : 14 /555 ,568 Schuijers , E . et al. “ Low Complexity Parametric Stereo Coding” ' (22 ) Filed : Nov. 26 , 2014 AES 116th Convention ; May 8 - 11 , 2004 , Berlin , Germany. 11 pages . (65 ) Prior Publication Data (Continued ) US 2015 /0086022 A1 Mar . 26 , 2015 Primary Examiner — Davetta W Goins Assistant Examiner — Daniel Sellers Related U . S . Application Data (74 ) Attorney , Agent, or Firm — Brian Cash ; Steinfl & (63 ) Continuation of application No . 13 /394 ,799 , filed as Bruno , LLP application No. PCT /EP2010 / 005481 on Sep .
    [Show full text]
  • Cpc Cooperative Patent Classification
    H04B CPC COOPERATIVE PATENT CLASSIFICATION H ELECTRICITY (NOTE omitted) H04 ELECTRIC COMMUNICATION TECHNIQUE (NOTE omitted) H04B TRANSMISSION NOTE This subclass covers the transmission of information-carrying signals, the transmission being independent of the nature of the information, and includes monitoring and testing arrangements and the suppression and limitation of noise and interference. WARNING In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme. 1/00 Details of transmission systems, not covered by 1/0035 . {Channel filtering, i.e. selecting a frequency a single one of groups H04B 3/00 - H04B 13/00; channel within a software radio system Details of transmission systems not characterised (multiplexing of multicarrier modulation by the medium used for transmission signals being represented by different frequencies H04L 5/06; multiplexing of NOTE multicarrier modulation signals H04L 5/023)} In this group, group H04B 1/0003 takes 1/0039 . {using DSP [Digital Signal Processor] precedence over groups H04B 1/005 - H04B 1/76 quadrature modulation and demodulation} 1/0042 . {Digital filtering (H04B 1/0035 takes 1/0003 . {Software-defined radio [SDR] systems, i.e. precedence; digital filters per se H03H 17/00)} systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, 1/0046 . {Decimation, i.e. data rate reduction are implented using software, e.g. by involving an techniques} AD or DA conversion stage such that at least part 1/005 . {adapting radio receivers, transmitters of the signal processing is performed in the digital andtransceivers for operation on two or more bands, domain (digital baseband systems H04L 25/00; i.e.
    [Show full text]
  • EERING MAGAZINE Recording, Broadcast and Sound Contracting
    EERING MAGAZINE recording, broadcast and sound contracting fields ■ring 2 to 8 trk: The Smaller Recording Studio as: Signal Processing Equipment * t a J 5Y Jc ^ j^POLK ST J^URG n i » ^ Its time to seize power. 7/ ! Tascam's Studio 8 puts all the power of a professional recording facility into an 8-track production system that's as easy to handle as your own instrument. Forget bewildering patch bay jungles. The fully assign- able 8 buss mixer sends your signals anywhere you want them with the flick of a switch. Forget open reel headaches. The unique Load feature loads the tape, senses the end automatically and never lets it run off the reel. And because Studio 8 uses 1/4" tape, you'll never be stuck trying to find someone's rare proorietary tape format. Forget video hassles. The "One Plug" SMPTE/EBU interface gives you easy synchronizer or editor connections. But there's something more. Something that's greater than the sum of the features. Startling sound. No other system has Tascam heads. Which means that no other system has the impact and clarity that come from Tascam's thirty years of recording experience. Quality production is what you do. Do it whh a major recording studio. Take control of a Tascam Studio 8. TASCAM © 1987 TEAC Corporation of America, 7733 Telegraph Road, Montebello, CA 9D640. 213/726-0303. Circle 12 on Reader Service Card JULY\AUGUST 1987 VOLUME 21 NO.4 MEAT AND POTATOES 24 Corey Davidson Editor/Publisher Larry Zide HANDS ON: THE SHURE WIRELESS MICROPHONE 44 Associate Publisher Elaine Zide SYSTEMS Drew Daniels Editorial Assistant Carol A.
    [Show full text]