Transmission of FM video signals over various lines
DCFirst Claim
1. A communications apparatus for communicating frequency modulated (FM) video signals through an electrical line having a characteristic impedance, the apparatus comprising:
- a first FM modulator for frequency modulating the video data to produce a frequency modulated carrier signal having a first preselected frequency;
a first transmitter having an output impedance, connected to the first FM modulator, for transmitting the modulated carrier signal; and
a first coupler connected between the electrical line and the first transmitter for matching the output impedance of the first transmitter to the characteristic impedance of the electrical line, wherein the first coupler comprises linear phase means for communicating the modulated carrier signal to the electrical line without significant phase distortion.
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Abstract
An apparatus for electrical line communications using FM video modulation, includes FM video modulation circuits and an impedance matching coupler at each of two or more locations along a pair of lines. The impedance matching couplers provide impedance matching, utilizing an air-core preselected frequency bands, sufficient to allow low-loss transmission of frequency modulated video signals. The coupler further eliminates noise and is matched resistively to the characteristic impedance of the line at the preselected frequency bands. A transmitter, receiver and associated circuits may also be provided at each location along the lines. The FM video modulation circuits, in combination with phase linear coupling techniques, provide for hi-fidelity video transmission over existing electrical lines, such as residential AC power wiring. In addition, a coupler with solid state impedance matching is provided.
179 Citations
45 Claims
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1. A communications apparatus for communicating frequency modulated (FM) video signals through an electrical line having a characteristic impedance, the apparatus comprising:
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a first FM modulator for frequency modulating the video data to produce a frequency modulated carrier signal having a first preselected frequency; a first transmitter having an output impedance, connected to the first FM modulator, for transmitting the modulated carrier signal; and a first coupler connected between the electrical line and the first transmitter for matching the output impedance of the first transmitter to the characteristic impedance of the electrical line, wherein the first coupler comprises linear phase means for communicating the modulated carrier signal to the electrical line without significant phase distortion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A communications apparatus for a vehicle for communicating frequency modulated (FM) video signals through an electrical line of the vehicle, the electrical line for transmitting an electrical current from a first point of the vehicle to a second point of the vehicle for powering a load connected to the electrical line proximate to the second point, the apparatus comprising:
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a modulator for frequency modulating video data to produce a frequency modulated carrier signal having a first preselected frequency; a transmitter having an output impedance, connected to the modulator, for transmitting the modulated carrier signal from the first point to the second point over the electrical line; and a first coupler connected between the electrical line and the transmitter for matching the output impedance of the transmitter to a characteristic impedance of the electrical line, wherein the first coupler comprises linear phase means for communicating the modulated carrier signal to the electrical line without significant phase distortion. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A system for transmitting frequency modulated (FM) video signals over electrical lines, the electrical lines generally provided for delivering electricity to a plurality of electrical outlets, wherein a first video display device is electrically connected to one of the plurality of electrical outlets, the system comprising:
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a first FM transmitter subsystem comprising; a first FM modulator connected to the video display device for receiving video signals therefrom and for frequency modulating the video signals to produce a modulated carrier signal having a first preselected frequency; a first transmitter having an output impedance, connected to the first FM modulator, for transmitting the modulated carrier signal; and a first coupler connected between the electrical line and the first transmitter for matching the output impedance of the first transmitter to a characteristic impedance of the electrical line, wherein the first coupler comprises linear phase means for communicating the modulated carrier signal to the electrical line without significant phase distortion. - View Dependent Claims (28)
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29. A communications apparatus for communicating modulated baseband video signals through an electrical line having a characteristic impedance, the apparatus comprising:
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a first modulator for modulating the baseband video data to produce a modulated carrier signal having a first preselected frequency; and a first transmitter having an output impedance, connected to the first modulator, for transmitting the modulated carrier signal. - View Dependent Claims (30)
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31. A communications apparatus for communicating modulated S-video signals through an electrical line having a characteristic impedance, the apparatus comprising:
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a first modulator for modulating the S-video signals to produce a modulated carrier signal having a first preselected frequency; and a first transmitter having an output impedance, connected to the first modulator, for transmitting the modulated carrier signal.
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32. A communications apparatus for communicating frequency modulated (FM) baseband video signals through an electrical line having a characteristic impedance, the apparatus comprising:
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a first FM modulator for frequency modulating the baseband video data to produce a frequency modulated carrier signal having a first preselected frequency; and a first transmitter having an output impedance, connected to the first FM modulator, for transmitting the modulated carrier signal.
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33. A communications apparatus for communicating frequency modulated (FM) S-video signals through an electrical line having a characteristic impedance, the apparatus comprising:
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a first FM modulator for frequency modulating the S-video signals to produce a frequency modulated carrier signal having a first preselected frequency; and a first transmitter having an output impedance, connected to the first FM modulator, for transmitting the modulated carrier signal.
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34. A communications apparatus for communicating frequency modulated (FM) video signals through an electrical line having a characteristic impedance, the apparatus comprising:
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a first FM modulator for frequency modulating the video data to produce a frequency modulated carrier signal having a first preselected frequency; a first transmitter having an output impedance, connected to the first FM modulator, for transmitting the modulated carrier signal; a first receiver having an input impedance for receiving the modulated carrier signal; a first FM demodulator electrically connected to the first receiver for demodulating the received modulated carrier signal to produce a demodulated carrier signal having a second preselected frequency; and a wireless remote-control (R/C) transmitter for transmitting data signals to the first receiver. - View Dependent Claims (35, 36, 37, 38, 39)
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40. A communications apparatus for communicating MPEG I modulated signals through an electrical line having a characteristic impedance, the apparatus comprising:
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a signal processor for converting video data to MPEG I video data; a first modulator for modulating the MPEG I video data to produce a modulated carrier signal having a first preselected frequency; and a first transmitter having an output impedance, connected to the first modulator, for transmitting the modulated carrier signal. - View Dependent Claims (41)
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42. A communications apparatus for communicating MPEG II modulated signals through an electrical line having a characteristic impedance, the apparatus comprising:
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a signal processor for converting video data to MPEG II video data; a first modulator for modulating the MPEG II video data to produce a modulated carrier signal having a first preselected frequency; and a first transmitter having an output impedance, connected to the first modulator, for transmitting the modulated carrier signal. - View Dependent Claims (43)
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44. A communications apparatus for communicating frequency modulated stereo audio signals through an electrical line, the apparatus comprising:
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a first modulator for modulating the stereo audio signals to produce a modulated carrier signal having a first preselected frequency; and a first transmitter having an output impedance, connected to the first modulator, for transmitting the modulated carrier signal. - View Dependent Claims (45)
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Specification