US5204877A
Expired / Lapsed
US
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Spread spectrum modulating device
Assignee: Faurecia Clarion Electronics Co Ltd
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Filing: 1992-01-31
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Granted: 1993-04-20
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Expires: 2012-01-31
Abstract
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.
Inventors
- 👤 Mamoru Endo
- 👤 Yoshitaka Uchida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:33
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/02; H04B; H04B1/00; H04B1/69; H04B1/707; H04J; H04J13/00; H04J13/0074
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
107 words
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.
Claim 2
Dependent Claim
107 words
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.
Claim 3
Dependent Claim
25 words
A spread spectrum modulating device according to claim 1 wherein said predetermined addresses are upper digit addresses and said remaining addresses are lower digit addresses.
Claim 4
Dependent Claim
58 words
A spread spectrum modulating device according to claim 1 wherein said counter includes clock generating means and outputs a latch clock signal, when the count value reaches a predetermined value, and further said serial-parallel converting means is provided with a latch circuit, which latches the converted parallel data when said latch clock signal has a predetermined logical state.
Claim 5
Dependent Claim
34 words
A spread spectrum modulating device according to claim 2 wherein a length of said lower digit addresses in said memory is set so as to correspond to one period of a spread spectrum code.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-19 | 1996-10-19 | 1997-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-19 | 2000-10-19 | 2001-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-19 | 2004-10-19 | 2005-04-20 | $7700.00 | Window Closed / Lapsed |