US4620239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrieval signal recording apparatus for magnetic tape recording/reproducing apparatus
Assignee: Hitachi Ltd
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Filing: 1984-03-14
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Granted: 1986-10-28
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Expires: 2004-03-14
Abstract
Abstract A retrieval signal recording apparatus for magnetic recording/reproducing apparatus wherein when an information signal is recorded on a magnetic tape, a retrieval signal different from the information signal is recorded at the beginning of the recorded information signal so that the magnetic tape is stopped or made in the reproducing mode just when the retrieval signal is picked up from the tape under a high tape speed. In the retrieval signal recording apparatus, the retrieval signal is recorded for a certain time only at the beginning of recording the signal or at both the beginning and end of the recorded signal, and the recording time of the retrieval signal is changed in accordance with the switching of a plurality of tape speeds such that the length of the retrieval signal recorded on the magnetic tape is made substantially constant even if the tape speed is different.
Inventors
- 👤 Fumiaki Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:23
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3018
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
170 words
A retrieval signal recording apparatus for magnetic tape recording/reproducing apparatus capable of switching a plurality of different tape speeds, comprising: means for generating a retrieval signal and recording it on a magnetic tape; and means for controlling said recording means at least at the beginning of recording an information signal on said magnetic tape to change to recording time of said retrieval signal in response to the switching of the tape speeds so that the length of the retrieval signal recorded on the magnetic tape is substantially constant even if a different tape speed is selected, said means for controlling recording means including gate means for allowing said retrieval signal to pass therethrough, and means for generating a gate control signal the duration of which is changed in association with the tape speed switching means of the magnetic tape recording/reproducing apparatus and which is used to open said gate means, in response to a signal for making the magnetic tape recording/reproducing apparatus in the mode of recording the information signal.
Claim 2
Dependent Claim
170 words
A retrieval signal recording apparatus for magnetic tape recording/reproducing apparatus capable of switching a plurality of different tape speeds, comprising: means for generating a retrieval signal and recording it on a magnetic tape; and means for controlling said recording means at least at the beginning of recording an information signal on said magnetic tape to change to recording time of said retrieval signal in response to the switching of the tape speeds so that the length of the retrieval signal recorded on the magnetic tape is substantially constant even if a different tape speed is selected, said means for controlling recording means including gate means for allowing said retrieval signal to pass therethrough, and means for generating a gate control signal the duration of which is changed in association with the tape speed switching means of the magnetic tape recording/reproducing apparatus and which is used to open said gate means, in response to a signal for making the magnetic tape recording/reproducing apparatus in the mode of recording the information signal.
Claim 3
Dependent Claim
46 words
A retrieval signal recording apparatus according to claim 1, wherein said recording means for retrieval signal has a magnetic head for erasing the substantially entire width of the magnetic tape, to which head a controlled retrieval signal is applied to be added on a bias signal.
Claim 4
Dependent Claim
35 words
A retrieval signal recording apparatus according to claim 1, wherein said recording means for retrieval signal has a magnetic head to which the controlled retrieval signal is applied to be added on a bias signal.
Claim 5
Dependent Claim
40 words
A retrieval signal recording apparatus according to claim 1, wherein said gate control signal generating means includes a monostable multivibrator having time constant circuits in which the capacitance values are switched in association with the switching of the tape speeds.
Claim 6
Dependent Claim
34 words
A retrieval signal recording apparatus according to claim 4, wherein said recording means for retrieval signal has a magnetic head to which the controlled retrieval signal is applied to be added on bias signal.
Claim 7
Dependent Claim
46 words
A retrieval signal recording apparatus according to claim 4, wherein said recording means for retrieval signal has a magnetic head for erasing the substantially entire width of the magnetic tape, to which head a controlled retrieval signal is applied to be added on a bias signal.
Claim 8
Dependent Claim
26 words
A retrieval signal recording apparatus according to claim 1, wherein said gate control signal generating means includes a monostable multivibrator capable of switching time constant circuits.
Claim 9
Dependent Claim
35 words
A retrieval signal recording apparatus according to claim 7 wherein said recording means for retrieval signal has a magnetic head to which the controlled retrieval signal is applied to be added on a bias signal.
Claim 10
Dependent Claim
46 words
A retrieval signal recording apparatus according to claim 7, wherein said recording means for retrieval signal has a magnetic head for erasing the substantially entire width of the magnetic tape, to which head a controlled retrieval signal is applied to be added on a bias signal.
Claim 11
Dependent Claim
184 words
A retrieval signal recording apparatus for magnetic tape recording/reproducing apparatus capable of switching a plurality of different tape speeds, comprising: means for generating a retrieval signal and recording it on a magnetic tape; and means for controlling said recording means at lest at the beginning of recording an information signal on said magnetic tape to change the recording time of said retrieval signal in response to the switching of the tape speeds so that the length of the retrieval signal recorded on the magnetic tape is substantially constant even if a different tape speed is selected, said means for controlling said recording means including gate means for allowing said retrieval signal to pass therethrough, and means for generating a gate control signal the duration of which is changed in association with the tape speed switching means of the magnetic tape recording/reproducing apparatus and which is used to open said gate means, in response to a signal for making the magnetic tape recording/reproducing apparatus in the mode of recording the information signal at the beginning of recording and at the end of the recording mode.
Claim 12
Dependent Claim
184 words
A retrieval signal recording apparatus for magnetic tape recording/reproducing apparatus capable of switching a plurality of different tape speeds, comprising: means for generating a retrieval signal and recording it on a magnetic tape; and means for controlling said recording means at lest at the beginning of recording an information signal on said magnetic tape to change the recording time of said retrieval signal in response to the switching of the tape speeds so that the length of the retrieval signal recorded on the magnetic tape is substantially constant even if a different tape speed is selected, said means for controlling said recording means including gate means for allowing said retrieval signal to pass therethrough, and means for generating a gate control signal the duration of which is changed in association with the tape speed switching means of the magnetic tape recording/reproducing apparatus and which is used to open said gate means, in response to a signal for making the magnetic tape recording/reproducing apparatus in the mode of recording the information signal at the beginning of recording and at the end of the recording mode.
Claim 13
Dependent Claim
46 words
A retrieval signal recording apparatus according to claim 10, wherein said recording means for retrieval signal has a magnetic head for erasing the substantially entire width of the magnetic tape, to which head a controlled retrieval signal is applied to be added on a bias signal.
Claim 14
Dependent Claim
35 words
A retrieval signal recording apparatus according to claim 10, wherein said recording means for retrieval signal has a magnetic head to which the controlled retrieval signal is applied to be added on a bias signal.
Claim 15
Dependent Claim
69 words
A retrieval signal recording apparatus according to claim 10, wherein said gate control signal generating means includes: an exclusive logic sum circuit having one input terminal to which the signal for making the magnetic tape recording/ reproducing apparatus in the recording mode is applied directly, and the other input terminal to which said signal is applied through a time constant circuit the time constant of which can be switched.
Claim 16
Dependent Claim
46 words
A retrieval signal recording apparatus according to claim 13, wherein said recording means for retrieval signal has a magnetic head for erasing the substantially entire width of the magnetic tape, to which head a controlled retrieval signal is applied to be added on a bias signal.
Claim 17
Dependent Claim
35 words
A retrieval signal recording apparatus according to claim 13, wherein said recording means for retrieval signal has a magnetic head to which the controlled retrieval signal is applied to be added on a bias signal.
Claim 18
Dependent Claim
42 words
A retrieval signal recording apparatus according to claim 13, wherein said time constant circuit includes capacitor means the capacitance value of which is changeable in association with the switching of the tape speeds of the magnetic tape recording/reproducing apparatus, and a resistor.
Claim 19
Dependent Claim
35 words
A retrieval signal recording apparatus according to claim 16, wherein said recording means for retrieval signal has a magnetic head to which the controlled retrieval signal is applied to be added on a bias signal.
Claim 20
Dependent Claim
46 words
A retrieval signal recording apparatus according to claim 16, wherein said recording means for retrieval signal has a magnetic head for erasing the substantially entire width of the magnetic tape, to which head a controlled retrieval signal is applied to be added on a bias signal.
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) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |