| 摘要 |
An apparatus for electrical line communications using FM video modulation, includes FM video modulation circuits (58, 66) and an impedance matching coupler (52, 68) at each of two or more locations along a pair of lines. The impedance matching couplers (52, 68) provide impedance matching, utilizing an air-core preselected frequency band, sufficient to allow low-loss transmission of frequency modulated video signals. The couplers (52, 68) further eliminate noise and are matched resistively to the characteristic impedance of the line at the preselected frequency bands. A transmitter (54), receiver (56) 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 (52) with solid state impedance matching is provided.
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