Multiplex communications – Wide area network – Packet switching
Patent
1996-05-16
1998-06-09
Voeltz, Emanuel Todd
Multiplex communications
Wide area network
Packet switching
370360, G08C 1500
Patent
active
057649170
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a professional system for switching a bidirectional transmission with time multiplexing for high-fidelity audio-analog and audio-digital signals and control and checking signals.
Devices for the transmission of digital signals, particularly audio-digital signals such as those produced and processed in recording studios, radio stages and control rooms for radio or television or concert halls have, in the case of certain uses, also a certain number of problems.
Nowadays, two types of transmission device are used, analog transmission systems and digital transmission systems. Analog transmission systems rely essentially on the principle of electric cabling from wire to wire. In -this case, each of the sources is individually connected to a housing which assembles in a single strand, called a multipair, all the wires from each source. This multipair is connected to a second housing which permits, by derivative cabling, routing and distributing the signals toward the different mixing control rooms. Finally, each control room has its own display panel (called a "patch") which permits it to organize its routing and posting of the signals. The return transmission of mixed or processed signals is effected by the same multipair whose wires will have been reserved for this purpose. Such arrangements have drawbacks by virtue of their weight and a very large volume of cable. Moreover, they require difficult and costly construction because of the high number of connectors and connections and because of the requirement to perform manual operations on the assembly of the network.
A second group of transmission systems is constituted by digital transmission systems. An example of such a system is described in U.S. Pat. No. 5,060,273. This system relies on the principle of digitized signal multiplexing. The sources are generally connected individually to one or several accumulation housings which assemble them in a multipair. This latter is connected to a transmitter housing which converts each signal by the bias of preamplification circuits. These circuits are remotely controlled from a master receiver by a specific connection. The digital signals multiplexed in series are transmitted in light form, through one or several optical fibers, and thus supply several control rooms simultaneously. The digital nature of the signal permits routing it by electronic control and memorizing different configurations. The remote control of the transmitter and the return of the signal in another direction takes place by a second optical fiber connection. Such a transmission device, whilst solving previous problems of analogous devices, namely by reduction of size and weight, nevertheless has other drawbacks such as, in particular, its cost, the fragility of the transmission device resulting from the fragility of the optical fibers and the impossibility of reconfiguring as desired the selected configuration so as to be able to vary the number of sources and the number of distribution channels.
Another device for the transmission of audio-digital signals is described in U.S. Pat. No. 4,922,536. In this device, a bidirectional transmission support sends the frames produced by multiplexing the high-fidelity signals between first end equipment for time switching and transmission of signals, called a transmitter, and second end equipment for time switching and transmission of signals, called a receiver. On the other hand, there is disclosed no processing device for signals in particular by means of signals for controlling and checking the parameters of the high-fidelity signals so as to act in real time on the parameters of said signals.
The object of the present invention is therefore to provide a professional system for switching a bidirectional transmission with time multiplexing for high-fidelity signals and control and checking signals between a transmitter and a receiver, that is simple to use and of low cost, independently of the configurations of the transmitter and receiver.
Another object of the inventi
REFERENCES:
patent: 3795771 (1974-03-01), Gundersen et al.
patent: 4922536 (1990-05-01), Hoque
Royer Christian
Royer Philippe
Innova Son, S.a.r.l.
Peeso Thomas
Todd Voeltz Emanuel
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