Abstract: According to one embodiment, a planar antenna device includes a support portion, a first plate-shaped movable portion, a second plate-shaped movable portion, a third plate-shaped movable portion, and a pair of plate-shaped antenna units. The support portion is formed to have a plate shape. The first plate-shaped movable portion is supported by the support portion and is rotatable around a first axial line. The second plate-shaped movable portion is supported by the first plate-shaped movable portion and is rotatable around a second axial line. The third plate-shaped movable portion is supported by the second plate-shaped movable portion and is rotatable around a third axial line. The pair of plate-shaped antenna units is turnably supported by the third plate-shaped movable portion and is switchable between a closed state and an open state.

Abstract: According to one embodiment, a planar antenna device includes a support portion, a first plate-shaped movable portion, a second plate-shaped movable portion, a third plate-shaped movable portion, and a pair of plate-shaped antenna units. The support portion is formed to have a plate shape. The first plate-shaped movable portion is supported by the support portion and is rotatable around a first axial line. The second plate-shaped movable portion is supported by the first plate-shaped movable portion and is rotatable around a second axial line. The third plate-shaped movable portion is supported by the second plate-shaped movable portion and is rotatable around a third axial line. The pair of plate-shaped antenna units is turnably supported by the third plate-shaped movable portion and is switchable between a closed state and an open state.

Abstract: A communications system adaptive echo canceller integrally contains a test far-end talker signal generator, an echo signal generator for generating an echo signal with a simulated echo path, a residual echo detector for detecting a residual echo based on the output of a subtracter, and a switching unit for switching an input and output signal of the echo canceller into an echo canceller test mode. Further, it provides a bypassing unit for, in a test mode, separating a call/talk connected to the echo cancellers from the echo cancellers and forming a bypass path between trunk circuits and a transmission circuit. The bypassing unit results in being able to realize a test for the echo canceller while a talk is alive.