Patent US3569618A successfully refreshed from Google Patents.
US3569618A
Expired / Lapsed
US
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Switching device for magnetic recording/reproducing apparatus
Assignee: NEC Corp
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Filing: 1967-10-31
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Granted: 1971-03-09
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Expires: 1987-10-31
Abstract
Abstract The disclosure broadly teaches a switching device for rotary recording/reproducing systems preferably of the magnetic tape variety wherein signals picked up by the multiple rotating heads are composed by switching means into a continuous composite signal. Conventional switching apparatus of the alternating black-white ring and accompanying photocell reading assembly is employed for initially composing signals from selected heads into a partial composite signal. The partial composite signals are then composed into a final continuous composite signal by use of wave envelope detecting means for detecting the envelope of any one of the signals reproduced by the read heads and forming shaped pulses or combining the initially composed signals into a final composite continuous signal in a very high precision manner.
Inventors
- 👤 Harunobu Nakamura
- 👤 Masao Inaba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:34
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/12; G11B15/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
Switching means for use in television signal recording and/or reproducing systems having a rotary-type head assembly comprised of plural read heads for reading patterns on a moving tape to reproduce television signals representative of said patterns; said switching means comprising: first means receiving reproduced television signals from one of said read heads for removing those components whose levels are less than a predetermined level; means for envelope-detecting the output signal of said removing means and means coupled thereto for producing a first switching signal; first switching means for combining the reproduced television signals generated by said read heads; and said first switching means being controlled by said first switching signals to accurately combine said reproduced television signals in accordance with their proper relationship.
Claim 2
Dependent Claim
123 words
Switching means for use in television signal recording and/or reproducing systems having a rotary-type head assembly comprised of plural read heads for reading patterns on a moving tape to reproduce television signals representative of said patterns; said switching means comprising: first means receiving reproduced television signals from one of said read heads for removing those components whose levels are less than a predetermined level; means for envelope-detecting the output signal of said removing means and means coupled thereto for producing a first switching signal; first switching means for combining the reproduced television signals generated by said read heads; and said first switching means being controlled by said first switching signals to accurately combine said reproduced television signals in accordance with their proper relationship.
Claim 3
Dependent Claim
95 words
The switching means of claim 1 further comprising: means controlled by said rotary head assembly for generating switching signals; a plurality of second switching means for combining selected ones of said reproduced signals, said plurality of second switching means being controlled by said second switching signals to combine selected portions of the reproduced signals applied thereto; and said first switching means receiving the combined signals from said plurality of second switching means and being controlled by said first switching signals to combine selected portions of the initially combined signals to form a composite continuous signal.
Claim 4
Dependent Claim
56 words
The switching means of claim 2 further comprising delay means coupled between said switching signal means and at least one of said plurality of second switching means for delaying said second switching pulses by an amount sufficient to cause proper switching of the reproduced signals applied to the second switching means coupled to said delay means.
Claim 5
Dependent Claim
43 words
The switching means of claim 2 Wherein: said switching signal generating means is comprised of a ring provided for rotation with said rotary head assembly comprised of alternating sectors of contrasting brightness; photosensitive means cooperating with said ring for generating said switching signals.
Claim 6
Dependent Claim
40 words
The switching means of claim 2 further comprising means receiving said first and second switching signals and being coupled to said first switching means for suppressing selected portions of said first switching signal under control of said second switching signal.
Claim 7
Dependent Claim
27 words
The switching means of claim 5 further comprising delay means coupled to said suppressing means for delaying output signals from said suppressing means by a predetermined amount.
Claim 8
Dependent Claim
113 words
The switching means of claim 6 further comprising means coupled between said first switching means and said delay means for generating first switching pulses to be applied to said first switching circuit means: means coupled to the output of said first switching means for demodulating said composite continuous signal; means coupled to said demodulating means for generating horizontal synchronizing signals; said means for generating said switching signals being further coupled to the output of said horizontal synchronizing pulse signal generating means for precisely controlling the final switching pulses to be in synchronism with said horizontal synchronizing pulses and to be in proper phase relationship with said reproduced signals derived from said read heads.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |