Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1994-07-25
1996-12-10
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
With control signal
455 382, 455 45, 455 93, 455142, 375216, H04B 100
Patent
active
055840515
DESCRIPTION:
BRIEF SUMMARY
There are VHF-FM and/or AM radio receivers with which, in a known way, an analog VHF-FM and/or AM radio signal is received and processed, and the corresponding audio and/or video signals reproduced in a suitable manner. Such radio (broadcast) receivers--hereinafter also designated as analog radio receivers--are available in various configurations as audio and/or video broadcast receivers with and without a recording unit. Not only radio broadcasts but also the conventional sound transmission of television broadcasting is realized using frequency modulation (FM).
From the research report BBC RD 1982/2 of the British Broadcasting Corporation "L.F. Radio Data: Specification of the BBC experimental transmissions 1982", August 1982, "Specifications of the Radio Data System RDS for VHF-FM sound broadcasting", EBU, Document Tech. 3244-E (March 1984), a method for transmitting auxiliary information--called radio data system, RDS for short, (=DIN EN 50067)--exclusively for VHF-FM and/or AM radio broadcasts is known with which, on the transmitter side, a subcarrier and/or the AM radio signal carrier is modulated with an auxiliary information or identification signal and in which, on the receiver side, the subcarrier or, respectively, the AM radio signal carrier is demodulated with regard to the auxiliary information signal, and the decoded auxiliary information obtained is used for tuning and/or reproduction purposes in a VHF-FM and/or AM radio receiver.
Recently, radio broadcast systems and associated transmission and receiver devices as well as parts thereof have been developed with which, in addition to VHF-FM and/or AM and PAL as well, non-compatible radio signals (DAB, DSR, MAC) can be transmitted in digitally coded form, received, processed and reproduced in a suitable manner. While with DSR (=digital satellite radio) the transmission of the digitally coded audio broadcast signals is realized via satellite and/or cable transmission paths in the 12 GHz and/or 118 MHz range, with DAB (=Digital Audio Broadcasting) besides the satellite transmission, above all the terrestrial transmission in the VHF range is provided in a digitally operated common-frequency network, whereby the information of, for example, six stereo stations (stations) is transmitted interlaced with each other distributed over a total of 1536 carrier frequencies (multiple "digital" frequencies) of a 1.5 MHz multiplex signal. DAB, like DSR too, permits a high quality reproduction of the audio signal in CD quality.
Digital radio broadcasting via radio satellites and/or cable routes has been available since 1986 in the Federal Republic of Germany and is known, for example, from the brochure "Digitaler Horfunk uber Rundfunksatelliten" (Digital radio via broadcasting satellites), an information brochure of the Bundesminister fur Forschung und Technologie (Federal Minister for Research and Technology), 1982. The DSR devices realized up to now are, however, only capable of receiving and processing digitalized radio broadcast signals. The alternative reception of analog radio broadcast signals on the conventional wavebands VHF, MW, SW and LW is neither possible nor planned owing to the non-compatibility between analog and digitalized radio signals.
Furthermore, within the scope of the European research project EUREKA 147-DAB, a digital audio radio broadcast transmission system DAB is being developed as a successor to the present VHF broadcasts. The basic principles of DAB are described in the magazine "Funkschau", issue 8, 1990, "Funkschau Spezial" section, pages 9 through 18. Here, the only requirement (page 16) is that with a DAB automobile radio, the reception of the classic wavebands should be possible as has been the case up to now.
In the following DAB will be used as the general term for broadcasting techniques or systems in the audio and/or video sectors in which the sound and/or video signals as well are transmitted (at least in part) in digitally coded form. VHF-FM and/or AM radio broadcasting will be used in the following as the general term f
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RTM Rundfunktechnische Mitteilungen, vol. 35, No. 2, Apr. 3, 1991, Norderstedt, Germany, pp. 45-66, Von Georg Plenge "Dab-Ein Neues Horrundfunksystem Stand Der Entwicklung Und \Wege Zu Seiner Einfuhrung".
Eisenzopf Reinhard J.
Emanuel Peter M.
Nguyen Lee
Thomson Consumer Electronics Sales GmbH
Tripoli Joseph S.
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