Transmitter-receiver

Details Transmitter-receiver Transmitter-receiver

1992-02-21

1994-05-03

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

455 86, 455257, H04B 156

Patent

active

053094298

ABSTRACT:
A TDD type transmitter-receiver capable of dividing one channel into a transmission slot and a reception slot with respect to time and performing time-divided transmission and reception of data during such slots respectively. The transmitter-receiver includes a transmitting circuit having the capacity to generate a carrier signal; a receiving circuit having an oscillator to generate an oscillation signal for converting a received signal into a predetermined intermediate frequency signal, and a mixer to mix the received signal with the oscillation signal; a signal line for supplying a leakage signal in the transmitting circuit to the receiving circuit; a frequency discriminator for converting into a voltage the frequency of the intermediate frequency signal obtained from the receiving circuit; a device for storing the voltage therein; and circuitry for controlling the oscillation frequency of the oscillator in accordance with the voltage. Since the frequency oscillation is controlled in conformity with the reference voltage, an exact AFC action can be executed under any environmental conditions.

REFERENCES:
patent: 3916412 (1975-10-01), Amoroso, Jr.
patent: 4325140 (1982-04-01), Stitzer
patent: 4903257 (1990-02-01), Takada et al.
patent: 5123008 (1992-06-01), Beesley

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