Communication system utilizing radiating transmission line
First Claim
1. A radio frequency communication system for communicating audio and video signals fro and to remote mobile stations comprising:
- a radiating transmission line;
a base station coupled to a first end of the radiating transmission line;
a first mobile audio station comprising mobile receiver means for receiving a first audio signal from the transmission line at a first frequency and mobile transmitter means for transmitting a second audio signal to the transmission line at a second frequency;
a mobile video station comprising mobile transmitter means for transmitting video signals to the transmission line at a third frequency;
at least one amplification means wherein each such amplification means is connected to said transmission line at periodic locations for amplifying the audio signals and video signals, said amplification means comprising;
audio amplification means for amplifying said audio signals;
first and second filtering means connected between said audio amplification means and said transmission line for filtering said video signal;
video amplifier means for amplifying said video signal in a direction toward the base station;
third and fourth filtering means connected between said video amplifier means and said transmission line for filtering said first and second audio signals;
wherein said first filtering means, audio amplification means and second filtering means are connected to said transmission line in parallel with said third filtering means, video amplifier means and fourth filtering means;
wherein the base station comprises base receiver means for receiving signals near the second and third frequencies from the transmission line; and
wherein the base station comprises base transmitter means for transmitting signal to the transmission line at the first frequency.
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Accused Products
Abstract
A radio frequency communication system utilizing a radiating transmission line for simultaneously communicating audio and video signals is disclosed. The video signals convey video information and the audio signals convey narrow band computer data or audio information. The communication system also provides several separate channels allowing simultaneous audio communication between a plurality of mobile stations. The communication system is intended to be used in environments where radio waves do not propagate well, such as in underground mines. The communication system comprises at least one amplification unit connected to the radiating transmission line for periodically amplifying the audio and video signals. The amplification units have a separate amplifier for amplifying each of the signals and each amplifier is connected to the transmission line in parallel. The amplifiers utilize transistors operating in the linear region. The amplifiers used to amplify the signal which is being radiated by the transmission line has a limiting circuit to attenuate the signal prior to amplification in order maintain the signal within the linear region of the amplifier.
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Citations
19 Claims
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1. A radio frequency communication system for communicating audio and video signals fro and to remote mobile stations comprising:
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a radiating transmission line; a base station coupled to a first end of the radiating transmission line; a first mobile audio station comprising mobile receiver means for receiving a first audio signal from the transmission line at a first frequency and mobile transmitter means for transmitting a second audio signal to the transmission line at a second frequency; a mobile video station comprising mobile transmitter means for transmitting video signals to the transmission line at a third frequency; at least one amplification means wherein each such amplification means is connected to said transmission line at periodic locations for amplifying the audio signals and video signals, said amplification means comprising; audio amplification means for amplifying said audio signals; first and second filtering means connected between said audio amplification means and said transmission line for filtering said video signal; video amplifier means for amplifying said video signal in a direction toward the base station; third and fourth filtering means connected between said video amplifier means and said transmission line for filtering said first and second audio signals; wherein said first filtering means, audio amplification means and second filtering means are connected to said transmission line in parallel with said third filtering means, video amplifier means and fourth filtering means; wherein the base station comprises base receiver means for receiving signals near the second and third frequencies from the transmission line; and wherein the base station comprises base transmitter means for transmitting signal to the transmission line at the first frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A radio frequency communication system for communicating audio signals between remote mobile audio stations and for communicating video signals from a remote mobile video station to a base station comprising:
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a radiating transmission line having one end coupled to said base station; at least one amplification means connected to the radiating transmission line for amplifying said audio and video signals; wherein each of said mobile audio stations receives audio signals at different frequencies near a first frequency and transmits audio signals at different frequencies near a second frequency; wherein each of said mobile video station transmits video signals at a third frequency; wherein the base station comprises base receiver means for receiving the audio and video signals from the transmission line; and wherein the base station comprises base transmitter means for re-transmitting audio signals received by the base receiving means to the transmission line at the first frequency. - View Dependent Claims (16, 17, 18, 19)
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Specification