Spread spectrum modulating device
AssigneeClarion Co., Ltd.
InventorsMamoru Endo, Yoshitaka Uchida
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Abstract
In a spread spectrum modulating device according to the present invention transmission data are converted into parallel data by a serial-parallel converting circuit, which are held by a latch circuit and assign upper digit addresses. Lower digit addresses in the memory are assigned by a counter. Parallel data outputted by the memory are converted into analogue signals by a D/A converter, which analogue signals are multiplied by a carrier by a multiplier to obtain a spread spectrum signal. Owing to the construction described above, a simple and small scale construction can be realized for the spread spectrum modulating device.
Claims4
A spread spectrum modulating device comprising:
- a memory for storing and holding a plurality of parallel data sets corresponding to assignments of address and outputting said parallel data sets, responding to assignments of address;
- serial-parallel converting means for converting serial data to be transmitted into parallel data and assigning predetermined addresses among addresses in said memory;
- a counter for assigning remaining addresses among the addresses in said memory by counting clock pulses and outputting a count value thus obtained;
- a D/A converter for D/A converting parallel data outputted by said memory;
- and
- a modulator for modulating a carrier with an analogue signal analogue-converted by said D/A converter.
Dependencies are inferred from the claim text.