US3737896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for recovery of recorded bit information on a magnetic recording medium
Assignee: Diablo Systems Inc
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Filing: 1971-10-27
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Granted: 1973-06-05
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Expires: 1991-10-27
Abstract
Abstract Apparatus for the recovery of recorded data bits from a magnetic recording medium where the data has been recorded by the frequency encoding or phase encoding method. Improved noise immunity and timing margins are provided by integrating the differentiated signal and summing the differentiated signal with the integrated signal to thus provide an improved playback waveform which is processed by a gating system which discriminates between clock pulses and data pulses.
Inventors
- 👤 A Gabor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:15
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1407; G11B20/1419
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
Apparatus for the recovery of recorded data bits from a magnetic recording medium in which the data has been recorded by a frequency encoding or phase encoding method where data pulses occur in the center of the memory cells and clock pulses occur at cell boundaries said apparatus comprising: means for receiving a playback signal having data and clock information corresponding to said data and clock pulses; means for differentiating said playback signal; means for summing said playback signal with said differentiated signal to shift the relative location of said data information with respect to said clock information; and means for processing said summed signals to separate said data information from said clock information.
Claim 2
Dependent Claim
114 words
Apparatus for the recovery of recorded data bits from a magnetic recording medium in which the data has been recorded by a frequency encoding or phase encoding method where data pulses occur in the center of the memory cells and clock pulses occur at cell boundaries said apparatus comprising: means for receiving a playback signal having data and clock information corresponding to said data and clock pulses; means for differentiating said playback signal; means for summing said playback signal with said differentiated signal to shift the relative location of said data information with respect to said clock information; and means for processing said summed signals to separate said data information from said clock information.
Claim 3
Dependent Claim
23 words
Apparatus as in claim 1 where said differentiating means includes a resistor-capacitor section and said summing means includes attenuating means shunting said capacitor.
Claim 4
Dependent Claim
17 words
Apparatus as in claim 1 where said attenuating means includes a resistor in series with a capacitor.
Claim 5
Dependent Claim
114 words
Apparatus for the recoveRy of recorded data bits from a magnetic recording medium in which the data has been recorded by a frequency encoding or phase encoding method where data pulses occur in the center of the memory cells and clock pulses occur at cell boundaries said apparatus comprising: means for receiving a playback signal having data and clock information corresponding to said data and clock pulses; means for differentiating said playback signal; means for summing said differentiated signal with said integrated signal to shift the relative location of said data information with respect to said clock information; and means for processing said summed signals to separate said data information from said clock information.
Claim 6
Dependent Claim
114 words
Apparatus for the recoveRy of recorded data bits from a magnetic recording medium in which the data has been recorded by a frequency encoding or phase encoding method where data pulses occur in the center of the memory cells and clock pulses occur at cell boundaries said apparatus comprising: means for receiving a playback signal having data and clock information corresponding to said data and clock pulses; means for differentiating said playback signal; means for summing said differentiated signal with said integrated signal to shift the relative location of said data information with respect to said clock information; and means for processing said summed signals to separate said data information from said clock information.
References Cited (Backward Citations)
US3252098A
Cited
US3387221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |