Spread spectrum modulating device
First Claim
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1. 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.
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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.
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4 Claims
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1. A spread spectrum modulating device comprising:
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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. - View Dependent Claims (2, 3, 4)
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Specification
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Current AssigneeClarion Co., Ltd. (Faurecia SA)
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Original AssigneeClarion Co., Ltd. (Faurecia SA)
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InventorsUchida, Yoshitaka, Endo, Mamoru
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Primary Examiner(s)Barron, Jr., Gilberto
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Application NumberUS07/829,731Time in Patent Office445 DaysField of Search375/1US Class Current375/130CPC Class CodesH04B 1/707 using direct sequence modul...H04J 13/0074 Code shifting or hoppingH04L 5/02 Channels characterised by t...
