H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/3
H04M 11/06 (2006.01) G08B 25/01 (2006.01) H04M 11/04 (2006.01)
Patent
CA 1200029
ABSTRACT OF THE DISCLOSURE A communication system includes a device connected to a line through a hybrid coil and performing the transmission/reception of data and voice from and/to an opposite device. A switching relay of a voice transmission/voice reception in the device is controlled by a control data from the opposite device. The control data is sent out a plurality of times and after detection in a data detecting portion, a continuous transmission check is made in a continuous transmission checking portion. In the device, a connection of data detecting portion and the line and a connection of a microphone and the line are alternately disconnected by a relay, so that a detection of data is made only when the transmission of voice is interrupted. The disconnecting relay is driven in response to a pulse of a predetermined duty ratio. If and when the first data is detected in the data detecting portion, a monostable multivibrator is triggered so that the disconnecting relay is maintained in condition that the detecting portion and the line are connected in response to the triggered output.
424867
G. Ronald Bell & Associates
Mitsubishi Denki Kabushiki Kaisha
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