US4425589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Record medium transducing error correction system and method
Assignee: IIT Research Institute
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Filing: 1981-04-23
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Granted: 1984-01-10
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Expires: 2001-04-23
Abstract
Abstract In one exemplary embodiment errors due to tape flutter are overcome by recording along with the analog signal clock pulses having a rate sufficient for sampling of the highest frequency component of the analog signal. Then on playback, the reproduced clock pulses control sampling and storage of samples of the reproduced analog signal. By reading out the samples from storage at a uniform clock rate, the effect of flutter on the reproduced signal is eliminated. In another example the recorded clock rate overcomes tape skew and other mechanical irregularities in recording and reproducing multiplexed analog or digital data.
Inventors
- 👤 Marvin Camras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:19
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/20; G11B20/22; G11B20/225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
A method of recording and reproducing information where the original signal has a high data rate exceeding the capability of a recording and reproducing system that is subject to mechanical variations in its record tape configuration and in its transducer head units, said method comprising: pre-processing the signal in a buffer that receives data words at the high rate so as to store the data words in a succession of registers of the buffer, reading out from the registers of the buffer contemporaneously, and recording the data from the respective registers on respective channels of the record tape at a lower rate within the capability of the recording and reproducing system, together with clocking pulses synchronized with the data on each channel, scanning the recorded channels of the record tape to reproduce the data together with the synchronized clocking pulses, reading the data from each channel into a respective register, clocked by the reproduced clocking pulses, and reading out the original information from the registers in series at the high data rate by means of accurate clock pulses at the corresponding high rate to reconstruct the original signal.
Claim 2
Independent Claim
188 words
A method of recording and reproducing information where the original signal has a high data rate exceeding the capability of a recording and reproducing system that is subject to mechanical variations in its record tape configuration and in its transducer head units, said method comprising: pre-processing the signal in a buffer that receives data words at the high rate so as to store the data words in a succession of registers of the buffer, reading out from the registers of the buffer contemporaneously, and recording the data from the respective registers on respective channels of the record tape at a lower rate within the capability of the recording and reproducing system, together with clocking pulses synchronized with the data on each channel, scanning the recorded channels of the record tape to reproduce the data together with the synchronized clocking pulses, reading the data from each channel into a respective register, clocked by the reproduced clocking pulses, and reading out the original information from the registers in series at the high data rate by means of accurate clock pulses at the corresponding high rate to reconstruct the original signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |