Transceiver controlled by absence/presence of input signal

Details Transceiver controlled by absence/presence of input signal Transceiver controlled by absence/presence of input signal

1994-04-13

1996-06-04

Faile, Andrew I.

Telecommunications

Transmitter and receiver at separate stations

455 83, 455 88, 370 29, H04B 154, H04J 306, H04J 318

Patent

active

055242740

ABSTRACT:
A transceiver having a transmitting unit and a receiving unit for performing substantially simultaneous communication with another transceiver in both directions by using a single frequency carrier. The transceiver includes a unit for generating a synchronizing signal for alternately switching between a transmission time period and a reception time period of the transceiver at a predetermined period, a signal processing unit for converting an input signal into a compressed signal by compressing a time axis of the input signal by a predetermined ratio, and affixing the synchronizing signal to the compressed signal, a unit for supplying the compressed signal with the synchronizing signal to the transmitting unit during the transmission time period, and a unit for reproducing an original signal from a signal transmitted from the other transceiver and received by the receiving unit during the reception time period, by expanding a time axis of the signal by a predetermined ratio. The transceiver further includes a signal detecting unit for detecting an absence/presence of the input signal and generating an output signal corresponding the absence/presence, and a control unit for controlling the operation of the signal processing unit in accordance with the output signal of the signal detecting unit. The control unit controls operation of the signal processing unit to transmit only a signal related to the synchronizing signal to the other transceiver, when the signal detecting unit generates the output signal representing an absence of the input signal for a predetermined time period.

REFERENCES:
patent: 5327461 (1994-07-01), Kushige
patent: 5335363 (1994-10-01), Takahashi et al.
"Simultaneous Transmitting and Receiving Method Mobile Radio Using Only One Frequency Channel" IEICE Spring Conference Mar. 24, 1992; p. 336.

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