System and method for switching signals over twisted-pair wires
a switching signal and wire technology, applied in the field of system and method for switching signals over twisted wires, can solve the problems of signal degradation problems, noise to be added to signals, and the inability to provide any method to alleviate signal degradation problems, so as to prevent the degradation of any noise added by the switching matrix
Inactive Publication Date: 2004-03-11
SHAH PRASANNA M +2
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- Application Information
AI Technical Summary
Benefits of technology
Enables high-quality audio / video signal transmission over long distances with remote control capabilities, allowing multiple devices to access a wide range of sources without the need for extensive cabling, while maintaining signal integrity and simplifying installation and expansion.
Problems solved by technology
The first problem is that most television sets have a limited number of auxiliary audio / video inputs available.
Although there are many different types of external switching equipment commercially available, they do not provide any method to alleviate the signal degradation problems discussed next.
In addition, these types of external switching equipment can allow noise to be added to the signals because they are directly switching the baseband signals.
The second problem occurs when a television set is located in a different room than the main home entertainment system.
Other signals, such as the high quality audio and video outputs of a digital satellite receiver system are not easily routed or extended from one room to another because the signals degrade after a short distance.
All presently employed methods, such as baseband signals over coaxial cables or channel modulators which send radio-frequency signals over coaxial cables, suffer from signal degradation and loss of audio and video quality.
A third problem also occurs when a television set is located in a different room than the main home entertainment system, and that is allowing for all the different audio and video sources to be fully accessible in the remote location.
This solution is usually impractical to consider due to the following problems: It is usually impractical or undesirable to install such a large number of cables within the wall.
Many signals cannot be extended in such a manner due to the signal degradation problems discussed above.
And also, it is difficult to add equipment to such a system due to the difficulty of running additional cabling through the walls to accommodate the additional signals.
The fourth problem occurs when the user is in a listening or viewing area which is located remotely from the source equipment.
Because most audio / video source equipment in use is controlled by infrared remotes, and infrared signals do not penetrate walls, this poses a problem when a user is in another room or some other location beyond the range of an infrared remote, since the user would not be able to control the source equipment from the remote location.
These units have several drawbacks including difficulty in operating with a multiplicity of transmitters and receivers.
Other types of systems send commands over cables to control the source equipment, but these control systems are not part of a switching system for switching audio / video signals.
In summary, known prior efforts for providing a plurality of audio and video signals has not provided for a mechanism such that the audio and video signals may be sent over a significant distance using a low-cost medium such as twisted-pair wires, and sent without any appreciable degradation in the signal quality.
Furthermore, known prior efforts to provide audio and video signals to be routed from audio and video sources has not provided remote control signals so that the sources can be easily controlled from a remote location.
Method used
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[0038] The following description is presented to enable one of ordinary skill in the art to make and use the invention and is provided in the context of a patent application and its requirements. Various modifications to the preferred embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments.
[0039] FIG. 1 shows a block diagram of the crosspoint matrix switching system 9 in accordance with the present invention.
[0040] The concept of a crosspoint switching matrix is well known having been used for many years in many different applications. For example, U.S. Pat. No. 5,481,125 in the name of Harris, 1996, describes a particular type of crosspoint switching matrix implemented by a CMOS integrated circuit. Although a crosspoint switching matrix is an essential element of the invention described herein, a crosspoint switching matrix by itself will not solve the aforementioned problems, nor will it provide for all ...
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A method and system for switching signals over conductors is disclosed. The method and system comprises a plurality of encoders for receiving signals from a plurality of sources. The system further comprises a crosspoint switching matrix means for receiving encoded signals from the plurality of encoders and for providing decoded signals to a plurality of receivers. The crosspoint switching matrix means in a preferred embodiment includes a control system for controlling multiple remote receivers.
Description
[0001] The present invention relates generally to the switching of signals and more particularly to switching a plurality of audio, video and data signals which are carried over twisted-pair wires.[0002] Modern home entertainment systems have available a plethora of electronic systems for reception or playback of audio and video programs. Examples include compact disc players, video cassette recorders, video laser disc players, digital satellite receivers and similar systems. In a typical installation these audio / video sources are located together along with the television set and stereo system, and the audio / video sources are directly connected to the television and stereo system.[0003] There are four problems that typically occur. The first problem is that most television sets have a limited number of auxiliary audio / video inputs available. If the entertainment system is comprised of more audio / video sources than the television can accept, then some sort of external switching equi...
Claims
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IPC IPC(8): H04N7/10H04N21/436H04N21/4363
CPCH04N7/104H04N7/106H04N21/43632H04N21/43615H04N7/108
InventorSHAH, PRASANNA M.TABER, ROBERT L.KNIESS, HERBERT J.
OwnerSHAH PRASANNA M