Data communication system

Details Data communication system Data communication system

1983-03-29

1984-12-11

Rubinson, Gene Z.

179 2DP, 179 5R, H04M 1100

Patent

active

044880030

ABSTRACT:
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.

REFERENCES:
patent: 3962546 (1976-06-01), Hashimoto
patent: 4009342 (1977-02-01), Fahrenschon et al.
patent: 4321429 (1982-03-01), Takatsuki et al.
IBM Technical Disclosure Bulletin, vol. 21, No. 8, Jan. 1979.
Japan Electrical Communication Society National Conf., vol. 8-1.

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