Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-04-08
1988-10-11
Adams, Russell E.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358181, H04N 576
Patent
active
047775033
DESCRIPTION:
BRIEF SUMMARY
Audiovisual equipment with different types of audiovisual-connection sockets is known from the field of entertainment electronics. Problems occur when pieces of equipment, one having (the older) DIN No. 45 582 connection sockets and another having DIN EN No. 50049 (the European standard) for instance, are to be employed together. Equipment of this type includes videodisk players, mixers, video-production equipment, television sets, monitors, and videorecorders.
Existing connection cables have made it possible to establish connections in only one direction at a time. Specifically, only a Type I cable can be used for example to connect a television set with a DIN socket to a videorecorder with a European Standard (SCART) socket and only a Type II cable to connect a television set with a European Standard socket to a videorecorder with a DIN socket. Since European Standard sockets have separate inputs and outputs for video and audio signals (the latter involving audio-right and audio-left channels), whereas the "older" DIN sockets always has to be switched over in accordance with the signal direction. This switching is carried out by means of a signal-path selector with a relay.
A device of universal application is known from German Pat. No. 3 140 814. The object of that invention is to eliminate the necessity of additional operations like unplugging and replugging connecting lines or manually switching a path selector when pieces of audiovisual equipment having different types of connection sockets are operated in conjunction. The electronics detector circuit described and claimed therein is said to be capable of determining from the presence and type of audio or video signals being supplied which on-line audiovisual equipmet on line is emitting and which is to receive the signals, and of accordingly releasing a switching command to the switchover circuit, which then automatically connects the output lines of the emitting equipment to the input lines of the receiving equipment.
That device, however, cannot be manufactured at a market-worthy price with the means presently available.
The object of the present invention is to provide an audio-video adapter of the type initially described that will allow operations in both directions between two pieces of audiovisual equipment, and especially between two videorecorders when a videotape is being copied, that have connection sockets of different standards. This object is attained in accordance with the invention by claim 1.
Further details are obtained from the dependent claims as well as the description of a preferred embodiment. The invention will hereinafter be described with reference to the drawings.
FIG. 1 is a simplified block diagram of the adapter and
FIG. 2 illustrates one embodiment of the invention by way of example, wherein the selector, the logic circuit, and the switchover device it activates are all accommodated in one housing.
FIG. 1 illustrates, one on the right and one on the left, two pieces of audiovisual equipment, each a videorecorder VR with a television receiver TV, that are to be connected. They have different types of connection sockets, the one on the left a European Standard (SCART) and the one on the right a DIN. The SCART socket has separate input E and output A contacts for audio right, audio left, and video. The DIN socket, however, has joint input-output E/A contacts for audio right, audio left, and video. The arrows indicate the directions that the input and output signals travel in. A logic circuit 40 is positioned between the respective switchover-voltage socket connections. Turning on a path selector PS, which controls the direction that the signals travel in, activates logic circuit 40, which triggers a switchover device 39 through output LS in such a way that all three switches shift from the output to the input contacts. This enables the piece of audiovisual equipment on the right, with the DIN socket, to play through the piece on the left, the videorecorder to play over the television set for example. Logic circuit 40 auto
REFERENCES:
patent: 4271403 (1981-06-01), Severson et al.
Adams Russell E.
Deutsche Thomson-Brandt GmbH
Fogiel Max
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