Telecommunications – Wireless distribution system
Patent
1989-11-02
1991-05-07
Eisenzopf, Reinhard J.
Telecommunications
Wireless distribution system
381 2, 381 3, 381119, H04H 100, H04H 500
Patent
active
050143417
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a master control desk for producing broadcast signals wherein a plurality of analog channel signals are summed and a further channel is added to the sum of the plurality of signals to produce an analog broadcast signal. Such a master control desk is described in (brochures entitled "Studer 900 Professionelle Regietechnik PI 3/82 D/E [Studer 900 Professional Control Technique PI 3/82 D/E] published by Studer International AG, Regensdorf, Switzerland.
For digital broadcast signals as they are intended, for example, for satellite radio broadcasts, it is known (as described in a brochure entitled "Neues Digitalstudio fur den WDR" [Novel Digital Studio for the West German Broadcasting System] published by Siemens AG) to process a plurality of incoming digital channel signals by means of digital function units. The digital channel signals originate either directly from digital audio signal sources such as, for example, CD players or DAT recorders, or they are obtained from analog audio signal sources by analog/digital conversion. Such digital master control desks are connected with structural and financial investments which are a multiple of that for analog control desks and require audio engineers to change their operating philosophy unless they want to take the even more expensive step of translating the customary operating philosophy for analog control desks by means of suitable software. Since the development of a broadcast involves different operating philosophies in each broadcast station, such software would have to be developed specifically for each station which would drive expenditures to a level that could no longer be justified.
SUMMARY OF INVENTION
It is therefore an object of the invention to provide a master control desk which permits, without changing operator philosophy, the generation of an analog broadcast signal as well as a digital broadcast signal, and does not impair the quality of the input signals originating from digital audio signal sources due to their digital/analog conversion and subsequent analog/digital conversion. The above objects are achieved without requiring unjustifiably high technical expenditures.
This is accomplished by a master control desk comprising an analog device and a digital device which respectively produce an analog broadcast signal and a digital broadcast signal. The analog device includes means for receiving and processing a plurality of analog channel signals to produce a sum, analog to digital means for converting the sum of the processed analog channel signals into a digital signal, and analog summing means for summing signals received through its inputs where one input receives the output of the analog processing means and the other input receives an analog signal from the digital device to produce the analog broadcast signal.
The digital device includes means for receiving and processing a plurality of digital channel signals, to produce a sum digital to analog means for converting the sum of the processed digital channel signals into the analog signal which is received by the analog summing means, and digital summing means having two inputs for summing signals received through its inputs where one input receives the output of the digital processing means and the other input receives the digital signal obtained from the conversion of the sum of the analog channel signals to produce the digital broadcast signal so that it has the same modulation content as the analog broadcast signal.
The master control desk according to the invention as, described above, employs a hybrid technology in which the input signals originating from digital audio signal sources are initially summed and a further digital signal corresponding to the sum of the processed analog input signals of the master control desk is added to this digital sum signal. The signal resulting therefrom constitutes the digital broadcast signal. Additionally, in the analog portion of the master control desk according to the invention, a further a
REFERENCES:
patent: 4723285 (1988-02-01), LeRoy et al.
patent: 4787085 (1988-11-01), Suto et al.
patent: 4922536 (1990-05-01), Hoque
Richards et al., "An Experimental All-Digital Studio Mixing Desk", Audio Engineering Society, vol. 30, No. 3, Mar. 1982.
"The Radio and Electronic Engineer", Band 53, Nov. 7/8, Jul./Aug 1983, IERE Cloudon, 6B)-Digital Audo Mixing.
Eisenzopf Reinhard J.
Faile Andrew
Werbung im Sudwestfunk GmbH
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