Tuner and splitter-modulator circuit having a common quartz crystal
First Claim
1. A circuit arrangement for an RF processing stage of a video recorder comprising:
- a tuner and a splitter-modulator where the splitter-modulator comprises a splitter and a modulator, the splitter having 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 supplying an RF output signal from the modulator, the tuner being adapted to demodulate the RF input signal and the modulator being adapted to convert a baseband signal into the RF output signal to be supplied by said modulator, and means for generating reference oscillations for the tuner and the splitter-modulator, said generating means having only one quartz crystal which is common to the tuner and the splitter-modulator.
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0 Petitions
Accused Products
Abstract
A circuit arrangement comprising a tuner and a splitter-modulator, the latter made up of a splitter and a modulator, the splitter having an RF signal input for receiving an RF input signal, an RF signal output for supplying an RF output signal, and a first line for applying the RF input signal to the tuner. A second line is provided for supplying 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 the modulator. Devices for generating reference oscillations for the tuner and the splitter-modulator have one quartz crystal which is common to the tuner and the splitter-modulator. This results in a reduction in the number of components, particularly for generating the oscillations.
11 Citations
8 Claims
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1. A circuit arrangement for an RF processing stage of a video recorder comprising:
- a tuner and a splitter-modulator where the splitter-modulator comprises a splitter and a modulator, the splitter having 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 supplying an RF output signal from the modulator, the tuner being adapted to demodulate the RF input signal and the modulator being adapted to convert a baseband signal into the RF output signal to be supplied by said modulator, and means for generating reference oscillations for the tuner and the splitter-modulator, said generating means having only one quartz crystal which is common to the tuner and the splitter-modulator.
- View Dependent Claims (2)
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3. In a video recorder, an RF signal processing apparatus comprising:
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an input terminal for receiving an RF input signal, a signal splitter having an input coupled to said input terminal and an output for supplying the RF output signal, a tuner circuit having an input coupled to the output of the signal splitter, means for demodulating the RF signal, and an output coupled to an I.F. output terminal, a modulator which converts a baseband signal into an RF output signal, means coupled to the tuner and to the modulator for generating reference frequency oscillations for the tuner and modulator and which includes a single quartz crystal which is common to the tuner and to the modulator, and means for coupling an output of the modulator to an RF output terminal. - View Dependent Claims (4, 5, 6, 7, 8)
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Specification