Patent US3688286A successfully refreshed from Google Patents.
US3688286A
Expired / Lapsed
US
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Digital data recording and reproducing system
Assignee: Novar Corp
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Filing: 1970-04-06
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Granted: 1972-08-29
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Expires: 1990-04-06
Abstract
Abstract A digital data recording system for recording digital information on a recording medium with each record separated by an inter-record gap and the characters within each record separated by an inter-character gap and a reproducing system for reproducing the data which includes an inter-character detector which detects the inter-character gap and destroys the recovered character if at the time of occurrence of such gap the complete character has not been reproduced and the inter-record gap detector which stops reproduction at the completion of each record.
Inventors
- 👤 William C Bennett
- 👤 David C Condon
- 👤 Rodney O Brink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:02
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/12; G11B20/1201; G11B20/1202; G11B20/1205
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
A digital data system including a tranSducer adapted to receive digital data and apply it to a recording medium to record the digital data on the recording medium comprising means for generating clocking signals at a reference frequency, means for receiving said signals and providing first and second signals each having half the reference frequency and being out of phase, a logic means for receiving said two signals and controlling application of signal to said transducer, said logic means providing a transition at the beginning of each bit time of a data character occuring at said first interval and providing a signal representative of the data only during the second half of each bit time, a shift register for storing digital information, and means for applying said second signal to said shift register whereby the data is transferred bit by bit to said logic means which processes the information and applies the signal to said transducer.
Claim 2
Dependent Claim
156 words
A digital data system including a tranSducer adapted to receive digital data and apply it to a recording medium to record the digital data on the recording medium comprising means for generating clocking signals at a reference frequency, means for receiving said signals and providing first and second signals each having half the reference frequency and being out of phase, a logic means for receiving said two signals and controlling application of signal to said transducer, said logic means providing a transition at the beginning of each bit time of a data character occuring at said first interval and providing a signal representative of the data only during the second half of each bit time, a shift register for storing digital information, and means for applying said second signal to said shift register whereby the data is transferred bit by bit to said logic means which processes the information and applies the signal to said transducer.
Claim 3
Dependent Claim
27 words
A system as in claim 1 wherein said logic means provides a signal representative of a zero during at least two bit times following each data character.
Claim 4
Dependent Claim
160 words
A digital data system including a transducer adapted to receive digital data and apply it to a recording medium to record the digital data on the recording medium comprising means for generating clocking signals at a reference frequency, means for receiving said signals and providing first and second signals each having half the reference frequency and being out of phase, a logic means for receiving said two signals and controlling application of signal to said transducer, a shift register for storing digital information, means for applying said second signal to said shift register whereby the data transferred bit by bit to said logic means which processes the information and applies the signal to said transducer, a storage means for receiving data serially from associated apparatus and temporarily storing same, and means for transferring the data to said shift register when a character has been transferred to said logic means, said transfer means being operated in response to a predetermined count.
Claim 5
Dependent Claim
160 words
A digital data system including a transducer adapted to receive digital data and apply it to a recording medium to record the digital data on the recording medium comprising means for generating clocking signals at a reference frequency, means for receiving said signals and providing first and second signals each having half the reference frequency and being out of phase, a logic means for receiving said two signals and controlling application of signal to said transducer, a shift register for storing digital information, means for applying said second signal to said shift register whereby the data transferred bit by bit to said logic means which processes the information and applies the signal to said transducer, a storage means for receiving data serially from associated apparatus and temporarily storing same, and means for transferring the data to said shift register when a character has been transferred to said logic means, said transfer means being operated in response to a predetermined count.
Claim 6
Independent Claim
132 words
A system for reproducing digital data of the type which includes multi-bit characters separated by inter-character gaps of a predetermined length from a recording medium, said recorded data including a transition at the beginning of each bit and the data in the second half only of each bit including a transducer cooperating with said medium and providing an output pulse when the recorded data has a transition, a peak detector for detecting peaks in said pulse, a flip-flop for providing output signals whose level changes each time a negative or positive peak is sensed, a shift register for receiving said output signal and means for shifting said register during the last half of each bit time in timed relationship with said output pulses to transfer the reproduced data into said shift register.
Claim 7
Independent Claim
132 words
A system for reproducing digital data of the type which includes multi-bit characters separated by inter-character gaps of a predetermined length from a recording medium, said recorded data including a transition at the beginning of each bit and the data in the second half only of each bit including a transducer cooperating with said medium and providing an output pulse when the recorded data has a transition, a peak detector for detecting peaks in said pulse, a flip-flop for providing output signals whose level changes each time a negative or positive peak is sensed, a shift register for receiving said output signal and means for shifting said register during the last half of each bit time in timed relationship with said output pulses to transfer the reproduced data into said shift register.
Claim 8
Dependent Claim
25 words
A system as in claim 4 in which said means for shifting said register comprises means forming a signal at each three quarter bit time.
Claim 9
Dependent Claim
25 words
A system as in claim 4 including an output buffer register and means for transferring the data in said shift register during an inter-character gap.
Claim 10
Dependent Claim
22 words
A system as in claim 6 including means for inhibiting the transfer of data if a complete character has not been reproduced.
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) | 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 |