Apparatus and method for transmitting digital data over various communication media
First Claim
1. A system for distributing signals over a vehicle power distribution system and for communicating between the vehicle and a remote station, the system comprising:
- a first modem connected to the vehicle power distribution system, said first modem being configured to;
(1) receive and modulate a carrier signal by at least one of a first source of video, a first sensor, a first computer, and a first telephone and provide a first modulated signal to the vehicle power distribution system, and (2) receive, second, third and fourth modulated signals from the vehicle power distribution system, demodulate the second, third and fourth modulated signals and provide a demodulated signal to at least one of a first video display, the first computer, and the first telephone;
a second modem connected to the vehicle power distribution system, said second modem being configured to;
(1) receive and modulate a carrier signal by at least one of a second source of video, a second sensor, a second computer, and a second telephone and provide a second modulated signal to the vehicle power distribution system, and (2) receive the first, third and fourth modulated signals from the vehicle power distribution system, demodulate the first, third and fourth modulated signals and provide a demodulated signal to at least one of a second video display, the second computer, and the second telephone; and
a third modem connected to the vehicle power distribution system, said third modem being configured to;
(1) receive the first modulated signal and the second modulated signal from the vehicle power distribution system, demodulate the first and second modulated signals and (a) provide the demodulated signals to at least one of a monitor, and a computer and (b) remodulate the demodulated first modulated signal and the demodulated second modulated signal and transmit the remodulated signals to the remote station, and (2) receive a modulated signal from the remote station, demodulate the signal from the remote station and provide the demodulated signal to at least one of a third video display, a third computer, and a third telephone and remodulate the third modulated signal and provide a third modulated signal to the vehicle power distribution system, and (3) receive and modulate signals from at least one of a third source of video, the third computer, and the third telephone and provide a fourth modulated signal to at least one of the vehicle power distribution system and the remote station.
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0 Petitions
Accused Products
Abstract
A system is described for transmitting video signals over various communication media using digital signal processing techniques. An embodiment of the system uses an orthogonal frequency division multiplexing (OFDM) modulation process that enables high-speed data communications of Ethernet and/or MPEG or JPEG or H264 compressed or uncompressed digital video. A second embodiment frequency modulates the OFDM modulated signal (FM-OFDM). The first and second embodiments are implemented with a transmit Ethernet interface, an MPEG or JPEG or H264 compressed or uncompressed digital video capture device, and a modem including a modulator and demodulator that provides communication with several other modem devices along communication media such as power lines, wireless (air), cable, or twisted pairs.
83 Citations
43 Claims
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1. A system for distributing signals over a vehicle power distribution system and for communicating between the vehicle and a remote station, the system comprising:
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a first modem connected to the vehicle power distribution system, said first modem being configured to;
(1) receive and modulate a carrier signal by at least one of a first source of video, a first sensor, a first computer, and a first telephone and provide a first modulated signal to the vehicle power distribution system, and (2) receive, second, third and fourth modulated signals from the vehicle power distribution system, demodulate the second, third and fourth modulated signals and provide a demodulated signal to at least one of a first video display, the first computer, and the first telephone;
a second modem connected to the vehicle power distribution system, said second modem being configured to;
(1) receive and modulate a carrier signal by at least one of a second source of video, a second sensor, a second computer, and a second telephone and provide a second modulated signal to the vehicle power distribution system, and (2) receive the first, third and fourth modulated signals from the vehicle power distribution system, demodulate the first, third and fourth modulated signals and provide a demodulated signal to at least one of a second video display, the second computer, and the second telephone; and
a third modem connected to the vehicle power distribution system, said third modem being configured to;
(1) receive the first modulated signal and the second modulated signal from the vehicle power distribution system, demodulate the first and second modulated signals and (a) provide the demodulated signals to at least one of a monitor, and a computer and (b) remodulate the demodulated first modulated signal and the demodulated second modulated signal and transmit the remodulated signals to the remote station, and (2) receive a modulated signal from the remote station, demodulate the signal from the remote station and provide the demodulated signal to at least one of a third video display, a third computer, and a third telephone and remodulate the third modulated signal and provide a third modulated signal to the vehicle power distribution system, and (3) receive and modulate signals from at least one of a third source of video, the third computer, and the third telephone and provide a fourth modulated signal to at least one of the vehicle power distribution system and the remote station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A monitoring system for twenty four hour monitoring of a parking lot, in which monitoring signals are transmitted though a lighting power system of the parking lot, the monitoring system comprising:
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a master modem configured to receive a plurality of modulated signals from the lighting power system of the parking lot, and provide a plurality of demodulated signals to a recording device, and a plurality of slave modems, each of which is configured to receive a video signal from a camera, modulate the video signal and provide the modulated signal to the lighting power system, wherein each of the slave modems and each of the cameras receive operating power from the lighting power system, wherein the lighting power is available for only a portion of each twenty four hour period, and wherein each slave modem and each camera includes means for operating when the lighting power is not available. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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26. A security monitoring system which utilizes a line power within a structure for transmission of signals between the components thereof, comprising:
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a master modem configured to receive a plurality of modulated signals from the power line, to provide a demodulated signal for transmission over the Internet and to receive commands from the Internet, and a plurality of slave modems, each of which is configured to receive a video signal from a camera, modulate the video signal and provide the modulated signal to the power line, wherein the video signal from any one of the cameras may be selected for transmission over the Internet by the reception of an appropriate one of the commands. - View Dependent Claims (27, 28, 29)
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30. A system for transmitting a video signal over an electrical power line connected to a plurality of premises comprising:
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a first modem, the output of which is connected to the power line, said modem receiving the video signal from a source and providing a modulated signal to the power line;
a second modem, the input of which is connected to the power line, said modem demodulating the modulated signal, and a display device connected to the output of said second modem, wherein the video signal is transmitted from the source to said first modem via the Internet. - View Dependent Claims (31, 32)
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33. A system for transmitting a video signal over an electrical power line connected to a plurality of premises comprising:
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a first modem, the output of which is connected to the power line, said modem receiving the video signal from a source and providing a modulated signal to the power line;
a second modem, the input of which is connected to the power line and the output of which is connected to the Internet at a first access point, said second modem demodulating the modulated signal, and a display device connected to the Internet at a second access point for displaying the video signal. - View Dependent Claims (34)
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35. A system for transmitting a cable television signal over an electrical power line connected to a plurality of premises comprising:
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a first modem for receiving the cable television signal, the output of said first modem being connected to the power line;
a second modem, the input of said second modem being connected to the power line for receiving the cable television signal, and a display device connected to the output of said second modem, wherein orthogonal frequency division modulation or frequency modulation-orthogonal frequency division modulation is used for transmitting the cable television signal over the power line.
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36. A system for transmitting a communication signal between power lines comprising:
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a transmitter which outputs an OFDM or an FM-OFDM signal at a radio frequency greater than 200 MHz;
a first power line which receives the OFDM or the FM-OFDM signal from the transmitter and radiates the OFDM or the FM-OFDM signal from a conductor of the first power line;
a second power line which wirelessly receives, by a conductor of the second power line, the OFDM or the FM-OFDM signal radiated from the first power line, and a receiver connected to the second power line which receives the OFDM or the FM-OFDM signal from the second power line.
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37. A system for transmitting and receiving a communication signal using a conductor of a power line comprising:
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a first transmitter/receiver connected to the power line, said first transmitter/receiver configured to output a first OFDM or FM-OFDM signal to the power line and receive a second OFDM or FM-OFDM signal from the power line, the power line having a conductor adapted to radiate the first OFDM or FM-OFDM signal received from the first transmitter and to wirelessly receive the second OFDM or FM-OFDM signal; and
a second transmitter/receiver configured to wirelessly transmit the second OFDM or FM-OFDM signal to the power line and to wirelessly receive the first OFDM or FM-OFDM from the power line. - View Dependent Claims (38, 39, 40, 41)
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42. A system for communicating over a power line comprising:
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a master modem connected to the power line and adapted to transmit a plurality of OFDM or FM-OFDM signals over the power line, each of which is transmitted within one of N distinct transmit frequency bands and to receive a plurality of OFDM or FM-OFDM signals from the power line, each of which is received on one of N distinct receive frequency bands, pairs of the transmit and receive frequency bands corresponding to operating frequencies of a sub-network;
a plurality of slave modems connected to the power line, each which being configured to operate in one of the N sub-networks and adapted to receive the OFDM or FM-OFDM signal from the master modem in a corresponding transmit frequency band and to transmit an OFDM or FM-OFDM signal to the master modem in a corresponding receive frequency band, wherein the slave modems in each sub-network transmit a time division multiplexed signal. - View Dependent Claims (43)
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Specification