US4297729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encoding and decoding of digital recordings
Assignee: QED Intellectual Property Ltd
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Filing: 1978-11-20
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Granted: 1981-10-27
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Expires: 1998-11-20
Abstract
Abstract In television games programs may be stored on tape, disc or similar to change a basic games unit to different games or other entertainment or instruction. The data is transferred from the recording medium to a processor and clocked in at a suitable rate. The invention provides generation of clock pulses using two counters. The arrangement generates clock pulses at a predetermined position of data 1's but for 0's it generates clock pulses a predetermined interval after the preceding pulse. An arrangement is provided recording staggered data on two tracks of a tape to counter drop outs and a watermark code is provided to guard against use of unauthorized programs.
Inventors
- 👤 James H. Steynor
- 👤 Frederick Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:59
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1407; G11B20/1419
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
An arrangement for generating controlled clock pulses synchronized to a signal comprising a sequence of `1`s, each indicated by the presence of a signal pulse and `0`s each indicated by the absence of a signal pulse, so that in a sequence of consecutive `0`s no signal pulses are present, the arrangement including a first counter receiving the said signal and arranged to count for a first predetermined period from a predetermined point in relation to each `1` of said signal and to provide a controlled clock pulse synchronized to said signal at the termination of the first period, a second counter arranged to count for a second and longer predetermined period from a preceding controlled clock pulse or until reset prior to the termination of said period and, if not reset, to provide at the termination of said second period a further controlled clock pulse and means for resetting the second counter on reception of a further `1` at the first counter.
Claim 2
Dependent Claim
162 words
An arrangement for generating controlled clock pulses synchronized to a signal comprising a sequence of `1`s, each indicated by the presence of a signal pulse and `0`s each indicated by the absence of a signal pulse, so that in a sequence of consecutive `0`s no signal pulses are present, the arrangement including a first counter receiving the said signal and arranged to count for a first predetermined period from a predetermined point in relation to each `1` of said signal and to provide a controlled clock pulse synchronized to said signal at the termination of the first period, a second counter arranged to count for a second and longer predetermined period from a preceding controlled clock pulse or until reset prior to the termination of said period and, if not reset, to provide at the termination of said second period a further controlled clock pulse and means for resetting the second counter on reception of a further `1` at the first counter.
Claim 3
Dependent Claim
30 words
An arrangement according to claim 1 including a generator of master clock pulses, the first and second predetermined periods being determined by respective predetermined counts of the master clock pulses.
Claim 4
Dependent Claim
29 words
An arrangement according to claim 2 in which the master clock pulses are generated at a rate which is a multiple of the expected bit rate of said signal.
Claim 5
Dependent Claim
23 words
An arrangement according to claim 3 in which the master clock pulse rate is sixteen times the expected bit rate of said signal.
Claim 6
Dependent Claim
35 words
An arrangement according to claim 1 in which the controlled clock pulses provided in response to `1`s' of said signal are arranged to have trailing edges coinciding with the trailing edge of the respective `1`.
Claim 7
Dependent Claim
19 words
An arrangement according to claim 1 in which the said predetermined point is the leading edge of said `1`.
Claim 8
Dependent Claim
23 words
An arrangement according to claim 1 in which the said predetermined point is the cross-over of the differentiated leading edge of said `1`.
Claim 9
Dependent Claim
23 words
An arrangement according to claim 1 in which the second counter is reset by the first counter on receipt of a `1` thereby.
Claim 10
Dependent Claim
32 words
An arrangement according to claim 1 in which the signal is provided as data coded by a biassed discrete code in which `1`s' and `0`s' representing data are separated by further `0`s'.
Claim 11
Independent Claim
35 words
A system for replaying recorded data and operating in the said data in response to controlled clock pulses, including an arrangement according to any one of claims 1-9 arranged to generate the controlled clock pulses.
Claim 12
Dependent Claim
12 words
A television game system including a replay system according to claim 10.
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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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |