Patent EP0622920A1 successfully refreshed from Google Patents.
EP0622920A1
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EP
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Spread spectrum receiving apparatus
Assignee: Canon Inc
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Filing: 1994-04-29
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Granted: —
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Expires: 2014-04-29
Abstract
Abstract A spread spectrum receiving apparatus comprises: a reproducing circuit (25) to reproduce a carrier signal from a reception signal and a diffusion code; a demodulation circuit (26) to demodulate the reception signal into a base band signal on the basis of the carrier signal reproduced by the reproducing circuit; and a judgment circuit to judge the reception data from the base band signal from the demodulation circuit. The reproducing circuit (25) has an operation circuit to arithmetically operate the reception signal and the diffusion code (24) and a detection circuit to detect a difference between the phases of an output of the operation circuit and an output of an oscillator. The oscillator oscillates at a carrier frequency in accordance with a phase difference detected by the detecting circuit.
Inventors
- 👤 Ichiro Kato
- 👤 Katsuo Saito
- 👤 Toshihiko Myojo
- 👤 Norihiro Mochizuki
- 👤 Hidetada Nago
- 👤 Tetsuo Kanda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 06:46
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/70712
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
61 words
A spread spectrum receiving apparatus comprising: reproducing means for reproducing a carrier signal from a reception signal and a diffusion code; demodulating means for demodulating the reception signal to a base band signal on the basis of the carrier signal reproduced by said reproducing means; and judging means for judging reception data from the base band signal from said demodulating means.
Claim 2
Dependent Claim
65 words
An apparatus according to claim 1, wherein said reproducing means has operating means for arithmetically operating the reception signal and the diffusion code and detecting means for detecting a difference between phases of an output of said operating means and an output of oscillating means, and said oscillating means oscillates at a carrier frequency in accordance with the phase difference detected by said detecting means.
Claim 3
Dependent Claim
111 words
An apparatus according to claim 1, wherein said reproducing means has: first operating means for arithmetically operating the reception signal and the diffusion code; phase shift means for shifting an output of oscillating means by 90°; second operating means for arithmetically operating the output of said oscillating means and an output of said first operating means; third operating means for arithmetically operating an output of said phase shift means and the output of said first operating means; and fourth operating means for arithmetically operating outputs of said second and third operating means, and said oscillating means oscillates at a carrier frequency in accordance with an output of said fourth operating means.
Claim 4
Dependent Claim
66 words
An apparatus according to claim 1, further comprising generating means for generating a plurality of diffusion codes, and wherein said reproducing means reproduces the carrier signal in accordance with one diffusion code generated by said generating means, and said judging means judges a plurality of reception data from said base band signal on the basis of a plurality of diffusion codes generated by said generating means.
Claim 5
Dependent Claim
35 words
An apparatus according to claim 4, wherein said reproducing means reproduces the carrier signal in accordance with a diffusion code which is used only for carrier signal reproduction and was generated by said generating means.
Claim 6
Dependent Claim
121 words
An apparatus according to claim 1, wherein said judging means has: converting means for converting the base band signal from said demodulating means into the digital signal synchronously with a code clock of said diffusion code; first operating means for arithmetically operating said digital signal and said diffusion code; second operating means for product summing an output of said first operating means synchronously with a code clock of said diffusion code; judging means for judging the reception data on the basis of an output of said second operating means; and output means for outputting data indicative of a reliability of the reception data which was judged by said judging means on the basis of an output of said second operating means.
Claim 7
Dependent Claim
92 words
A spread spectrum receiving apparatus comprising: generating means for generating a plurality of diffusion codes; reproducing means for reproducing a carrier signal from a reception signal and the diffusion codes generated by said generating means; demodulating means for demodulating the reception signal into a base band signal on the basis of the carrier signal reproduced by said reproducing means; and judging means for judging a plurality of reception data from the base band signal from said demodulating means on the basis of said plurality of diffusion codes generated by said generating means.
Claim 8
Dependent Claim
65 words
An apparatus according to claim 7, wherein said reproducing means has operating means for arithmetically operating the reception signal and the diffusion code and detecting means for detecting a difference between phases of an output of said operating means and an output of oscillating means, and said oscillating means oscillates at a carrier frequency in accordance with the phase difference detected by said detecting means.
Claim 9
Dependent Claim
111 words
An apparatus according to claim 7, wherein said reproducing means has: first operating means for arithmetically operating the reception signal and the diffusion code; phase shift means for shifting an output of oscillating means by 90°; second operating means for arithmetically operating the output of said oscillating means and an output of said first operating means; third operating means for arithmetically operating an output of said phase shift means and the output of said first operating means; and fourth operating means for arithmetically operating outputs of said second and third operating means, and said oscillating means oscillates at a carrier frequency in accordance with an output of said fourth operating means.
Claim 10
Dependent Claim
35 words
An apparatus according to claim 7, wherein said reproducing means reproduces the carrier signal in accordance with a diffusion code which is used only for carrier signal reproduction and was generated by said generating means.
Claim 11
Dependent Claim
21 words
An apparatus according to claim 7, wherein said judging means judges a plurality of reception data which were code division multiplexed.
Claim 12
Dependent Claim
133 words
An apparatus according to claim 7, wherein said judging means has: converting means for converting the base band signal from said demodulating means into the digital signal synchronously with a code clock of said diffusion code; a plurality of first operating means for arithmetically operating said digital signal and said plurality of diffusion codes; a plurality of second operating means for product summing outputs of said plurality of first operating means synchronously with the code clock of said diffusion code; judging means for judging a plurality of reception data on the basis of outputs of said plurality of second operating means; and output means for outputting data indicative of reliabilities of said plurality of reception data judged by said judging means on the basis of outputs of said plurality of second operating means.
Claim 13
Dependent Claim
90 words
A spread spectrum communicating apparatus comprising: generating means for generating a plurality of diffusion codes; and communicating means for communicating in accordance with a plurality of diffusion codes generated by said generating means, and wherein said communicating means communicates in accordance with a code for synchronization which was in accordance with a code for synchronization which was generated by said generating means in order to establish a code synchronization and communicates in accordance with said plurality of diffusion codes generated by said generating means after the code synchronization was established.
Claim 14
Dependent Claim
28 words
An apparatus according to claim 13, wherein said communicating means diffuses or inversely diffuses a plurality of data in parallel in accordance with said plurality of diffusion codes.
Claim 15
Dependent Claim
48 words
An apparatus according to claim 13, further comprising timer means for measuring a time which is required to execute the communication for establishment of the code synchronization, and wherein said communicating means communicates in accordance with said plurality of diffusion codes on the basis of said timer means.
Claim 16
Dependent Claim
80 words
An apparatus according to claim 13, further comprising: correlating means for obtaining a correlation of the reception signal and said code for synchronization; mask means for masking portions out of a predetermined range from a normalization position of the peak of said correlating means in accordance with a code period of said code for synchronization; and control means for controlling said generating means in accordance with a correlation output of said correlating means which was masked by said mask means.
Claim 17
Dependent Claim
42 words
An apparatus according to claim 16, further comprising means for outputting a pseudo peak output in the case where no output peak is derived from said correlating means in the portions out of the range which were masked by said masking means.
References Cited (Backward Citations)
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