Patent US4174079A successfully refreshed from Google Patents.
US4174079A
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Method of detecting tape transport condition
Assignee: SHIN-SHIRASUNA ELECTRIC CORP
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Filing: 1977-02-22
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Granted: 1979-11-13
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Expires: 1997-02-22
Abstract
Abstract A method of detecting tape transport condition, wherein a signal is derived from detector means provided in association with at least one of a pair of spindle reels of a tape recorder to detect the rate of revolution of said spindle, said signal having a frequency proportional to the rate of revolution of said spindle. The signal derived from the detector means is applied to a phase-locked loop, and it is also applied to a synchronism detecting circuit, together with a signal derived from a voltage-controlled oscillator contained in said phase-locked loop. Thus, detection is made with respect to whether or not these two signals agree in frequency with each other.
Inventors
- 👤 Kiyoshi Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:32
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/05; G11B15/093; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/911
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
A method of detecting tape transport condition, which comprises deriving a signal from detector means provided in association with at least one of a pair of reel spindles to detect the rate of revolution of said reel spindle, said signal having a frequency proportional to said rate of revolution, applying said signal to a phase-locked loop having a lock range which is previously set so as to cover the rotational speed range of said reel spindle as the tape is being transported at a predetermined steady speed, applying to a synchronism detecting circuit said signal derived from said detector means and a signal derived from a voltage-controlled oscillator contained in said phase-locked loop, and detecting whether or not said two signals agree in frequency with each other.
Claim 2
Independent Claim
127 words
A method of detecting tape transport condition, which comprises deriving a signal from detector means provided in association with at least one of a pair of reel spindles to detect the rate of revolution of said reel spindle, said signal having a frequency proportional to said rate of revolution, applying said signal to a phase-locked loop having a lock range which is previously set so as to cover the rotational speed range of said reel spindle as the tape is being transported at a predetermined steady speed, applying to a synchronism detecting circuit said signal derived from said detector means and a signal derived from a voltage-controlled oscillator contained in said phase-locked loop, and detecting whether or not said two signals agree in frequency with each other.
Claim 3
Dependent Claim
21 words
A method according to claim 1, wherein said detector means is associated with the take-up reel spindle of a tape recorder.
Claim 4
Dependent Claim
21 words
A method according to claim 1, wherein said detector means is associated with the supply reel spindle of a tape recorder.
Claim 5
Dependent Claim
28 words
A method according to claim 1, wherein use is made two detector means provided in association with the take-up and supply reel spindles of a tape recorder respectively.
References Cited (Backward Citations)
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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) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |