Patent US2115280A successfully refreshed from Google Patents.
Patent US4286294A successfully refreshed from Google Patents.
US4286294A
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Recording/reproducing system
Assignee: Kokusai Gijutsu Kaihatsu Co Ltd
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Filing: 1978-11-29
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Granted: 1981-08-25
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Expires: 1998-11-29
Abstract
Abstract In the case that an analog signal is recorded or reproduced by using a sensor and recording medium relatively moving against the sensor, a sampling signal is generated which is adapted to have a frequency thereof deviated dependently upon an amount of wow and flutter caused by fluctuations in the speed of the relative motion therebetween. A reproduced signal is sampled by means of the sampling signal and, a sampled signal is stored in a memory. After this, a stored contents in the memory are read out by using a reading signal with a predetermined frequency, thereby to remove from the reproduced signal varying frequency components caused by the wow and flutter.
Inventors
- 👤 Shunsaku Nakauchi
- 👤 Fumio Watase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:44
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3018; G11B20/00; G11B20/22; G11B20/225; G11B23/00; G11B23/0007; G11B2220/00; G11B2220/20; G11B2220/90; G11B2220/91; G11B2220/913
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A method for reproducing a signal of the type containing an analog signal and a reference signal superposed thereon from a recording medium which moves relative to a sensor, comprising the steps of: sampling said analog signal from said sensor to produce samples at a first rate determined by said reference signal from said sensor; storing said samples in a memory at said first rate; reading out said samples from said memory at a fixed predetermined frequency; converting said samples read out from said memory into a continuous analog signal; monitoring the number of said samples contained in said memory; and controlling the speed of motion of said recording medium relative to said sensor in a manner effective to maintain said number of samples contained in said memory at a predetermined amount.
Claim 2
Independent Claim
132 words
A method for reproducing a signal of the type containing an analog signal and a reference signal superposed thereon from a recording medium which moves relative to a sensor, comprising the steps of: sampling said analog signal from said sensor to produce samples at a first rate determined by said reference signal from said sensor; storing said samples in a memory at said first rate; reading out said samples from said memory at a fixed predetermined frequency; converting said samples read out from said memory into a continuous analog signal; monitoring the number of said samples contained in said memory; and controlling the speed of motion of said recording medium relative to said sensor in a manner effective to maintain said number of samples contained in said memory at a predetermined amount.
Claim 3
Dependent Claim
31 words
A method according to claim 1 further comprising delaying the start of the step of reading out until the number of said samples contained in said memory reaches said predetermined amount.
Claim 4
Independent Claim
130 words
A method for discontinuously recording a continuous signal of the type containing an analog signal and a reference signal having a first fixed frequency superposed thereon on a recording medium which moves relative to a recording device, comprising: sampling said continuous signal at a second frequency to produce discrete samples thereof; said second frequency being at least twice said first frequency; storing said discrete samples in a memory; reading out said discrete samples in a first period at a third frequency substantially higher than said second frequency; halting said reading out between an end of a preceding first period and a beginning of a following first period; converting said discrete samples into a second signal occurring discontinuously; and recording said second signal by said recording device on said recording medium.
Claim 5
Independent Claim
130 words
A method for discontinuously recording a continuous signal of the type containing an analog signal and a reference signal having a first fixed frequency superposed thereon on a recording medium which moves relative to a recording device, comprising: sampling said continuous signal at a second frequency to produce discrete samples thereof; said second frequency being at least twice said first frequency; storing said discrete samples in a memory; reading out said discrete samples in a first period at a third frequency substantially higher than said second frequency; halting said reading out between an end of a preceding first period and a beginning of a following first period; converting said discrete samples into a second signal occurring discontinuously; and recording said second signal by said recording device on said recording medium.
Claim 6
Dependent Claim
81 words
A method according to claim 3 wherein said recording medium includes a sheet-type recording medium and the step of recording includes producing a first relative motion of said recording medium and said recording device to define a recording track on said sheet-like recording medium during said first period and producing a second relative motion of said recording medium and said recording device to move to a beginning of a next recording track on said sheet-like recording medium during said second period.
Claim 7
Independent Claim
132 words
A method for reproducing a continuous signal which has been discontinuously recorded during a plurality of first periods separated by second periods on a recording medium which moves with respect to a sensor, said continuous signal containing an analog signal having a reference signal superposed thereon, comprising the steps of: sampling the discontinuously recorded signal at a first frequency to produce discrete samples; said first frequency being related to said reference signal reproduced by said sensor; storing said discrete samples in a memory; reading out said samples from said memory at a fixed predetermined second frequency; said second frequency being related to said first frequency such that said samples read out from said memory do not contain gaps; and converting said samples read out from said memory into a converted continuous signal.
Claim 8
Independent Claim
132 words
A method for reproducing a continuous signal which has been discontinuously recorded during a plurality of first periods separated by second periods on a recording medium which moves with respect to a sensor, said continuous signal containing an analog signal having a reference signal superposed thereon, comprising the steps of: sampling the discontinuously recorded signal at a first frequency to produce discrete samples; said first frequency being related to said reference signal reproduced by said sensor; storing said discrete samples in a memory; reading out said samples from said memory at a fixed predetermined second frequency; said second frequency being related to said first frequency such that said samples read out from said memory do not contain gaps; and converting said samples read out from said memory into a converted continuous signal.
References Cited (Backward Citations)
US3253237A
Cited
US3347997A
Cited
US3815035A
Cited
US3975761A
Cited
US3975240A
Cited
US4054921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |