Abstract: A plug-and-play video transmitting device comprises a converting main machine and a receiver. Wherein the converting main machine includes a first station-selecting control unit, a first control unit, a compressing unit and a first signal receiving and emitting unit; the receiver includes a second signal receiving and emitting unit, a second control unit and a decompressing unit. With these elements, a power line in a socket of a district power supply system carries the television signals and transmits them after they are compressed by the converting main machine; so that a normal television set can synchronically obtain power from a socket of a district power supply system directly through the receiver and decompress the compressed signals. In this way, the effect of convenient assembling and the effect of plug-and-play without arrangement of lines can be obtained.

Abstract: A structure of modem shell with round sound suppression comprises: a box formed by opposite upper and lower half shell bodies, wherein a concave spacing the opening of which is directed outwards is installed thereon, while within the spacing is installed with a line output hole; a covering plate the size of which is enough to cover the opening of the spacing, and a plurality of through holes is installed on the covering surface thereof; and a buckling mechanism is formed by at least two pairs of buckling holes and a pillar; thereby, the spacing is used to locate a trumpet and then is covered by a covering plate so to effectively suppress the round sound generated by the modem.