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Home Television Multi-channel-infrared-cableless-communication-system

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 Multi-channel infrared cableless communication system

Details
Inventors: Austin, Lawrence C.;
Assignee: Corporation of the President of the Church of Jesus Christ of Latter-Day (Salt Lake City, UT)
Primary Examiner: Orsino; Joseph A.
Assistant Examiner: van Beek; L.
Attorney, Agent or Firm:

A system for simultaneously transmitting a plurality of audio signals into a transmission space from at least one transmission point to one or more reception points. The plurality of audio signals is inputted to an encoder. The encoder time-division multiplexes and samples the audio signals to generate an encoded pulse amplitude modulated signal. The encoded pulse amplitude modulated signal is converted into a corresponding encoded pulse position modulated signal. A sync pulse is then added to the encoded pulse position modulated signal to form an encoded composite signal. The encoded composite signal is broadcast into the transmission space as an optical signal, preferably in the infrared portion of the spectrum. The optical signal is received by at least one receiver located in the transmission space. Each of the receivers receives the optical signal and generates a received pulse position modulated signal. A portion of the pulse position modulated signal which contains a selected one of the plurality of audio signals is converted into a pulse amplitude modulated signal. The pulse amplitude modulated signal is then converted into a corresponding audio signal which is presented to a user. Preferably each receiver is completely portable and may be carried about by the user. The user preferably hears the selected audio signal by way of headphones included with the receiver. One particular application of the disclosed system is where verbal translation of a speaker's words must simultaneously occur in several languages and all of those translations are conveyed to listeners who individually select one of the translations to listen to.

DETAILED DESCRIPTION In view of the present state of the art, it is a primary object of the present invention to provide a system for cablelessly communicating a plurality of audio channels from a transmitter to one or more receivers located within a transmission space.
It is another object of the present invention to provide a multi-channel cableless communication system which utilizes an optical signal between a transmitter and receiver and which maintains cross-talk between different audio channels at a minimum.
A further object of the present invention is to provide a multi-channel infrared cableless communication system and method wherein many low cost digital electronic components may be used as opposed to analog circuit components.
Yet another object of the present invention is to provide an infrared cableless communication system wherein a large number of audio signals may be simultaneously broadcast.
It is still another object of the present invention is to provide a multi-channel infrared cableless communication system which is portable and requires little or no maintenance.
A still further object of the present invention is to provide a multi-channel infrared cableless communication system wherein a high power infrared optical signal may be transmitted using low cost, easily obtainable optical devices.
Additional objects and advantages will be apparent from the description which follows or they may be learned by the practice of the invention.
Consistent with the foregoing objects, the present invention provides a multi-channel infrared communication system which allows a plurality of audio signals to be broadcast from a transmission point to one or more receivers which may be located anywhere within the optical range of the transmitter, i.
e.
, the transmission space.
The system of the present invention may be broadly divided into three major functional components: an encoder; a transmitter; and, at least one portable receiver.
The present invention includes means for inputting a plurality of independent audio signals into the encoder


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