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US3688039A
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Digital signal reception system
Assignee: NEC Corp
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Filing: 1970-08-03
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Granted: 1972-08-29
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Expires: 1990-08-03
Abstract
Abstract A digital system reception signal comprises an error detection circuit for detecting an error code contained in the transmitted coded signal. Upon the detection of the error code, the received composite digital signal of the repetition period or scanning line replaces the stored coded signal of the previous repetition period.
Inventors
- 👤 Tatsuo Ishiguro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:18
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/90; H04L; H04L1/00; H04L1/004; H04N7/00; H04N7/24; H04N7/52; H04N7/54; H04N7/56
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
219 words
A digital signal reception system comprising means for receiving a composite code signal having a plurality of succeeding repetition periods and including within each of said repetition periods an information code signal obtained by encoding an analog information signal within the corresponding one of said repetition periods, and an error detection code for detecting the code error caused in a transmission system coupled to said reception system; said information code signal within one of said repetition periods having a high correlation with the information code signal within the preceding one of said repetition periods; means for detecting the code error in said composite code signal; first storing means for storing a part of said composite code signal which corresponds to the code signal within at least one of said repetition periods; second storing means coupled to said first storing means for storing the output code signal of said first storing means during at least one of said repetition periods; means for reading out, every time the code error is detected, the output code signal having no code error from said second storing means; means for reading out the output code signal from said first storing means when no code error is detected; and means for converting the output code signal of said reAding out means into an analog signal.
Claim 2
Dependent Claim
219 words
A digital signal reception system comprising means for receiving a composite code signal having a plurality of succeeding repetition periods and including within each of said repetition periods an information code signal obtained by encoding an analog information signal within the corresponding one of said repetition periods, and an error detection code for detecting the code error caused in a transmission system coupled to said reception system; said information code signal within one of said repetition periods having a high correlation with the information code signal within the preceding one of said repetition periods; means for detecting the code error in said composite code signal; first storing means for storing a part of said composite code signal which corresponds to the code signal within at least one of said repetition periods; second storing means coupled to said first storing means for storing the output code signal of said first storing means during at least one of said repetition periods; means for reading out, every time the code error is detected, the output code signal having no code error from said second storing means; means for reading out the output code signal from said first storing means when no code error is detected; and means for converting the output code signal of said reAding out means into an analog signal.
Claim 3
Dependent Claim
31 words
The digital signal reception system of claim 1, further comprising means for shifting the contents of said first storing means to said second storing means when no code error is detected.
Claim 4
Dependent Claim
36 words
The digital signal reception system of claim 1, in which said read out means further comprises gating means coupled to the outputs of said first and second storing means and to said code error detecting means.
Claim 5
Dependent Claim
49 words
The digital signal reception system of claim 3, in which said first and second storing means respectively comprises first and second shift registers, said readout means further comprising means for transferring the contents of said second shift register to said gating means upon the detection of said code error.
Claim 6
Dependent Claim
28 words
The digital reception system of claim 4, further comprising second gating means operatively interposed between said first and second shift registers and coupled to said first-mentioned gating means.
Claim 7
Dependent Claim
35 words
The digital reception system of claim 4, in which the number of stages in each of said first and second shift registers is equal to the number of bits in each of said repetition periods.
References Cited (Backward Citations)
US3372376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |