Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Patent
1996-10-17
1999-02-02
Le, Thanh Cong
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
4551871, 4551891, 455315, H04B 148
Patent
active
058677712
ABSTRACT:
A circuit arrangement includes a tuner and a splitter-modulator having a splitter and a modulator. The splitter includes an RF signal input for receiving an RF input signal, an RF signal output for supplying an RF output signal, a first line for applying the RF input signal to the tuner and a second line for receiving an RF output signal from the modulator. The tuner is adapted to demodulate the RF input signal, and the modulator is adapted to convert a baseband signal into the RF output signal to be supplied by said modulator. The circuit arrangement further includes devices for generating reference oscillations for the tuner and the splitter-modulator, these devices having at least one quartz crystal which is common for the tuner and the splitter-modulator, and a phase-locked loop which is common for the tuner and the splitter-modulator. A possibly compact construction by using a minimal number of components at low manufacturing costs is achieved in that the tuner includes at least one signal-processing branch for frequency-selective reception, amplification and/or frequency conversion of the RF signals of each frequency band, and the devices for generating reference oscillations (oscillation generator) include a separate oscillator stage for each signal-processing branch, one of these oscillator stages also being used for generating the reference oscillation for the splitter-modulator.
REFERENCES:
patent: 4379271 (1983-04-01), Lehmann
patent: 5640688 (1997-06-01), Ruitenburg
patent: 5722053 (1998-02-01), Kornfeld et al.
New High Density Multistandard RF-Concept For VCR G.M. Maier, B. Fischer, A. Selz, J. Lance, T.F. Tey Thomson Consumer Electronics R&D Labs Germany/Singapore.
Cong Le Thanh
Goodman Edward W.
U.S. Philips Corporation
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