Patent US3283063A successfully refreshed from Google Patents.
US3283063A
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Automatic equalizer system
Assignee: Fujitsu Ltd
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Filing: 1963-04-10
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Granted: 1966-11-01
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Expires: 1983-04-10
Abstract
No abstract record available.
Inventors
- 👤 Kawashima Masao
- 👤 Higeta Tsukumo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:58
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/142
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
246 words
A SYSTEM, COMPRISING SIGNAL TRANSMITTING MEANS INCLUDING MEANS FOR PRODUCING A MAIN SIGNAL; FIRST PILOT WAVEFORM GENERATING MEANS FOR PRODUCING A PILOT WAVEFORM OUTSIDE THE TIME AND WAVEFORM OF SAID MAIN SIGNAL; AND TRANSMITTING MEANS FOR TRANSMITTING SAID PILOT WAVEFROM TOGETHER WITH SAID MAIN SIGNAL THROUGH A TRANSMITTING MEDIUM; AND WAVEFROM EQUALIZING RECEIVER MEANS FROM SAID TRANSMITTING MEANS, SAID WAVEFROM EQUALIZING RECEIVER MEANS COMPRISING DELAY MEANS, A PLURALITY OF INTERMEDIATE TAPS ON SAID DELAY MEANS, A MAIN TAP ON SAID DELAY MEANS, AN OUTPUT LINE, ADJUSTABLE LOW-FREQUENCY EQUALIZER MEANS CONNECTING THE MAIN TAP OF SAID DELAY MEANS TO SAID OUTPUT LINE, A PLURALITY OF ADJUSTER MEANS CONNECTING CORRESPONDING ONES OF SAID INTERMEDIATE TAPS TO SAID OUTPUT LINE, SECOND PILOT WAVEFROM GENERATING MEANS SYNCHRONIZED WITH THE PILOT WAVEFROM PRODUCED BY SAID FIRST PILOT WAVEFROM GENERATING MEANS FOR PRODUCING AN OUTPUT PILOT WAVEFROM CORRESPONDING TO THE TRANSMITTED PILOT WAVEFROM PRODUCED BY SAID FIRST PILOT WAVEFROM GENERATING MEANS COMPARATOR MEANS HAVING AN INPUT CONNECTED TO SAID OUTPUT LINE AND AN INPUT CONNECTED TO SAID SECOND PILOT WAVEFROM GENERATING MEANS FOR COMPARING THE OUTPUT WAVEFORM OF SAID WAVEFORM EQUALIZING MEANS WITH THE OUTPUT WAVEFROM OF SAID SECOND PILOT WAVEFROM GENERATING MEANS AND FOR PRODUCING AN ERROR SIGNAL CORRESPONDING TO THE DIFFERENCE BETWEEN SAID INPUTS, AND CORRECTION MEANS RESPONSIVE TO THE ERROR SIGNAL OF SAID COMPARATOR MEANS AND COUPLED BETWEEN SAID COMPARATOR MEANS AND SAID ADJUSTING MEANS AND SAID LOW-FREQUENCY EQUALIZER FOR ADJUSTING SAID ADJUSTING MEANS AND SAID LOW FREQUENCY EQUALIZER.
Claim 2
Independent Claim
246 words
A SYSTEM, COMPRISING SIGNAL TRANSMITTING MEANS INCLUDING MEANS FOR PRODUCING A MAIN SIGNAL; FIRST PILOT WAVEFORM GENERATING MEANS FOR PRODUCING A PILOT WAVEFORM OUTSIDE THE TIME AND WAVEFORM OF SAID MAIN SIGNAL; AND TRANSMITTING MEANS FOR TRANSMITTING SAID PILOT WAVEFROM TOGETHER WITH SAID MAIN SIGNAL THROUGH A TRANSMITTING MEDIUM; AND WAVEFROM EQUALIZING RECEIVER MEANS FROM SAID TRANSMITTING MEANS, SAID WAVEFROM EQUALIZING RECEIVER MEANS COMPRISING DELAY MEANS, A PLURALITY OF INTERMEDIATE TAPS ON SAID DELAY MEANS, A MAIN TAP ON SAID DELAY MEANS, AN OUTPUT LINE, ADJUSTABLE LOW-FREQUENCY EQUALIZER MEANS CONNECTING THE MAIN TAP OF SAID DELAY MEANS TO SAID OUTPUT LINE, A PLURALITY OF ADJUSTER MEANS CONNECTING CORRESPONDING ONES OF SAID INTERMEDIATE TAPS TO SAID OUTPUT LINE, SECOND PILOT WAVEFROM GENERATING MEANS SYNCHRONIZED WITH THE PILOT WAVEFROM PRODUCED BY SAID FIRST PILOT WAVEFROM GENERATING MEANS FOR PRODUCING AN OUTPUT PILOT WAVEFROM CORRESPONDING TO THE TRANSMITTED PILOT WAVEFROM PRODUCED BY SAID FIRST PILOT WAVEFROM GENERATING MEANS COMPARATOR MEANS HAVING AN INPUT CONNECTED TO SAID OUTPUT LINE AND AN INPUT CONNECTED TO SAID SECOND PILOT WAVEFROM GENERATING MEANS FOR COMPARING THE OUTPUT WAVEFORM OF SAID WAVEFORM EQUALIZING MEANS WITH THE OUTPUT WAVEFROM OF SAID SECOND PILOT WAVEFROM GENERATING MEANS AND FOR PRODUCING AN ERROR SIGNAL CORRESPONDING TO THE DIFFERENCE BETWEEN SAID INPUTS, AND CORRECTION MEANS RESPONSIVE TO THE ERROR SIGNAL OF SAID COMPARATOR MEANS AND COUPLED BETWEEN SAID COMPARATOR MEANS AND SAID ADJUSTING MEANS AND SAID LOW-FREQUENCY EQUALIZER FOR ADJUSTING SAID ADJUSTING MEANS AND SAID LOW FREQUENCY EQUALIZER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |