Patent US3863265A successfully refreshed from Google Patents.
US3863265A
Expired / Lapsed
US
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Method and apparatus for inserting data records on magnetic tape
Assignee: Nortel Networks Inc
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Filing: 1973-02-09
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Granted: 1975-01-28
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Expires: 1993-02-09
Abstract
Abstract A threshold detector is coupled to a ''''write'''' head in a recording apparatus to detect the leading edge of the first transition of previously recorded data and provide a control signal therefrom. A control circuit coupled to the threshold detector switches the recording apparatus to the ''''write'''' or recording mode of operation immediately upon the detection of the predetermined threshold voltage from the write head so that the same head then immediately switches its operation and operates to record new data information directly and accurately over the previously recorded data. By utilizing this method, new records can automatically be inserted accurately in a particular segment of a previously recorded tape, such as in a recording format for digital information which employs segments of recorded information as discreet records, with an inter-record gap between each record, with each record including a preamble immediately followed by the data information.
Inventors
- 👤 Marlin K Klumpp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:46
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/02; G11B27/031; G11B27/036; G11B27/032
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
99 words
A method of demonstrating the presence of a predetermined recording condition on a recording medium, comprising the steps of: sensing the recording medium to detect the presence of said recording condition and producing signals having a level representative of such condition when the same is detected; providing a reference signal having a level representative of the predetermined signal condition desired to be indicated; comparing the level of the sensed signals with that of the reference signal; and generating a control signal when the level of the sensed signal bears a predetermined relationship to the level of the reference signal.
Claim 2
Independent Claim
99 words
A method of demonstrating the presence of a predetermined recording condition on a recording medium, comprising the steps of: sensing the recording medium to detect the presence of said recording condition and producing signals having a level representative of such condition when the same is detected; providing a reference signal having a level representative of the predetermined signal condition desired to be indicated; comparing the level of the sensed signals with that of the reference signal; and generating a control signal when the level of the sensed signal bears a predetermined relationship to the level of the reference signal.
Claim 3
Independent Claim
97 words
A method of inserting data on a recording media in place of data previously recorded thereon in a format which includes a preamble immediately followed by the data record, comprising the steps of: transporting the recording media past a detecting head to produce signals; monitoring the signals from said head as the recorded media is transported thereby; detecting a predetermined signal condition from the leading edge of the preamble of previously recorded information during said monitoring step; and initiating the recording of new information on the media in response to the detection of said predetermined signal condition.
Claim 4
Independent Claim
97 words
A method of inserting data on a recording media in place of data previously recorded thereon in a format which includes a preamble immediately followed by the data record, comprising the steps of: transporting the recording media past a detecting head to produce signals; monitoring the signals from said head as the recorded media is transported thereby; detecting a predetermined signal condition from the leading edge of the preamble of previously recorded information during said monitoring step; and initiating the recording of new information on the media in response to the detection of said predetermined signal condition.
Claim 5
Dependent Claim
120 words
In a tape recording-playback system including a tape transport for waving tape adjacent a recording head, wherein the tape includes segments with recorded signals and non-recorded gaps of tape separating the recorded segments, a method of controlling the recording of new signals over a prerecorded tape segment comprising: detecting prerecorded signals as a segment of tape carrying such signals reaches the recording head; comparing the leading portion of the detected prerecorded signals with a reference; generating a control signal responsive to the coincidence of the compared signal and reference; and applying new information signals from a source of such signals to the recording head in response to said control signal to record the new information signals over the previously-recorded signals.
Claim 6
Dependent Claim
120 words
In a tape recording-playback system including a tape transport for waving tape adjacent a recording head, wherein the tape includes segments with recorded signals and non-recorded gaps of tape separating the recorded segments, a method of controlling the recording of new signals over a prerecorded tape segment comprising: detecting prerecorded signals as a segment of tape carrying such signals reaches the recording head; comparing the leading portion of the detected prerecorded signals with a reference; generating a control signal responsive to the coincidence of the compared signal and reference; and applying new information signals from a source of such signals to the recording head in response to said control signal to record the new information signals over the previously-recorded signals.
Claim 7
Dependent Claim
142 words
In a tape recording apparatus, circuit means responsive to recorded information on a tape replayed on said apparatus to control the recording of new information on said tape in predetermined relationship to the previously recorded information, said circuit comprising: a tape head for detecting recorded information on the tape as it is transported adjacent said head; an amplifier coupled to said head for providing output signals representative of information recorded on the tape; a detector circuit coupled to said amplifier for detecting a predetermined signal and providing an output signal in response thereto; and control means coupled to said detector and adapted to be coupled to a source of information to be recorded, said control means responsive to said output signals from said detector to supply signals from said source to said tape head for recording when said predetermined signal is detected.
Claim 8
Dependent Claim
142 words
In a tape recording apparatus, circuit means responsive to recorded information on a tape replayed on said apparatus to control the recording of new information on said tape in predetermined relationship to the previously recorded information, said circuit comprising: a tape head for detecting recorded information on the tape as it is transported adjacent said head; an amplifier coupled to said head for providing output signals representative of information recorded on the tape; a detector circuit coupled to said amplifier for detecting a predetermined signal and providing an output signal in response thereto; and control means coupled to said detector and adapted to be coupled to a source of information to be recorded, said control means responsive to said output signals from said detector to supply signals from said source to said tape head for recording when said predetermined signal is detected.
Claim 9
Dependent Claim
26 words
The circuit as defined in claim 4 wherein said detector circuit comprises a threshold detector for detecting a predetermined level of the signals from said amplifier.
Claim 10
Dependent Claim
72 words
The circuit as defined in claim 5 wherein said threshold detector comprises a comparator and a source of reference voltage, said comparator having one input terminal coupled to said amplifier and a second input terminal coupled to said source of reference voltage, said comparator further incluDing an output terminal for providing a control signal thereto upon the coincidence of the signal voltage from said amplifier and the reference voltage from said source.
Claim 11
Dependent Claim
203 words
A tape recording-playback apparatus including a tape transport for moving tape lengthwise across a recording head, said tape including segments having information recorded therein with non-recorded gaps of tape separating such segments, a circuit for controlling the recording of new information from a source of such information over a prerecorded tape segment, comprising: amplifying means coupled to the recording head to amplify signals produced thereby as a segment of said tape is moved past said head and is sensed thereby; detection means coupled to said amplifier for detecting a predetermined amplitude of the leading signal sensed from a segment of prerecorded information and for providing a control signal responsive to the detection thereof; selective coupling means adapted to receive signals from a source of signals representing information to be recorded, and to selectively couple such signals to the recording head; and control means coupled to said detection means and to said selective coupling means and responsive to the control signal provided by said detection means when said predetermined amplitude signal is detected to actuate said selective coupling means to couple the information signals from said source thereof to the recording head, whereby such signals are recorded over the segment of previously recorded signals.
Claim 12
Dependent Claim
203 words
A tape recording-playback apparatus including a tape transport for moving tape lengthwise across a recording head, said tape including segments having information recorded therein with non-recorded gaps of tape separating such segments, a circuit for controlling the recording of new information from a source of such information over a prerecorded tape segment, comprising: amplifying means coupled to the recording head to amplify signals produced thereby as a segment of said tape is moved past said head and is sensed thereby; detection means coupled to said amplifier for detecting a predetermined amplitude of the leading signal sensed from a segment of prerecorded information and for providing a control signal responsive to the detection thereof; selective coupling means adapted to receive signals from a source of signals representing information to be recorded, and to selectively couple such signals to the recording head; and control means coupled to said detection means and to said selective coupling means and responsive to the control signal provided by said detection means when said predetermined amplitude signal is detected to actuate said selective coupling means to couple the information signals from said source thereof to the recording head, whereby such signals are recorded over the segment of previously recorded signals.
Claim 13
Dependent Claim
72 words
The system as defined in claim 7 wherein said detection means comprises a comparator and a source of reference voltage, said comparator having one input terminal coupled to said amplifier and a second input terminal coupled to said source of reference voltage, said comparator further including an output terminal for providing a control signal thereto upon the coincidence of the signal voltage from said amplifier and the reference voltage from said source.
Claim 14
Dependent Claim
91 words
The system as defined in claim 7 wherein said selective coupling means comprises a second amplifier and a gate circuit, said second amplifier having an output terminal coupled to the recording head and an input terminal coupled to said gate circuit, said gate circuit having an input terminal adapted to be coupled to a source of signals to be recorded and a control terminal coupled to said control means, said gate circuit actuated by an enabling signal from said control means to couple signals to be recorded to said second amplifier.
Claim 15
Independent Claim
120 words
A method of positioning magnetically recorded information upon a recording media having previously-recorded transitions thereon, comprising the steps; moving the media relative to a magnetic head means capable of producing electrical signals in response to recorded magnetic transitions, so as to cause a given one of said previously-recorded transitions to approach said head means; monitoring the signals produced by said head means as said one transition approaches and comes into registry with the head means; using a predetermined characteristic of the parting of said signal representing media at least slightly down-stream of the main part of said one transition as a switching signal to position the point on said media where information is subsequently recorded, relative to said one transition.
Claim 16
Independent Claim
120 words
A method of positioning magnetically recorded information upon a recording media having previously-recorded transitions thereon, comprising the steps; moving the media relative to a magnetic head means capable of producing electrical signals in response to recorded magnetic transitions, so as to cause a given one of said previously-recorded transitions to approach said head means; monitoring the signals produced by said head means as said one transition approaches and comes into registry with the head means; using a predetermined characteristic of the parting of said signal representing media at least slightly down-stream of the main part of said one transition as a switching signal to position the point on said media where information is subsequently recorded, relative to said one transition.
Claim 17
Dependent Claim
41 words
The method as recited in claim 10, wherein said magnetic head means is used as the recording head which makes said subsequent recording of information, in addition to being used to produce said signals in response to previously, recorded magnetic transitions.
Claim 18
Dependent Claim
16 words
The method as recited in claim 10 as used with magnetic recording tape as said media.
Claim 19
Dependent Claim
53 words
The method as recited in claim 10, wherein said switching signal is used to position said media such that said point where information is subsequently recorded is the same point where at least part of said one transition is recorded, said subsequent recording thus occurring over at least said paRt of said transition.
Claim 20
Dependent Claim
123 words
Means for positioning the place on a magnetic recording media where information is subsequently recorded, relative to previously-recorded magnetic transitions, comprising: transducing means for producing electrical signals in response to proximal movement of magnetic recording media having magnetic transitions recorded thereon, and as a given such transition approaches said means during such movement; drive means for effecting such movement of said media; and monitoring means for receiving said electrical signals produced during such movement and for enabling a recording means in response to a predetermined characteristic of said signals representing the portion of said media located at least slightly downstream of said given transition, such, that said recording means records information on said media at a predetermined point relative to said given transition.
Claim 21
Dependent Claim
123 words
Means for positioning the place on a magnetic recording media where information is subsequently recorded, relative to previously-recorded magnetic transitions, comprising: transducing means for producing electrical signals in response to proximal movement of magnetic recording media having magnetic transitions recorded thereon, and as a given such transition approaches said means during such movement; drive means for effecting such movement of said media; and monitoring means for receiving said electrical signals produced during such movement and for enabling a recording means in response to a predetermined characteristic of said signals representing the portion of said media located at least slightly downstream of said given transition, such, that said recording means records information on said media at a predetermined point relative to said given transition.
Claim 22
Independent Claim
98 words
A method of making changes in a magnetic recording, by use of recording apparatus having a write head or gap for recording purposes and a read head or gap for reproducing purposes, comprising: using said write head or gap in part as a reading device, to produce electrical signals in response to proximal movement of said recording with respect to said write head or gap and using at least a portion of said electrical signals to cause switching of said write head or gap to a write mode of operation in response to predetermined conditions of said signals.
Claim 23
Independent Claim
98 words
A method of making changes in a magnetic recording, by use of recording apparatus having a write head or gap for recording purposes and a read head or gap for reproducing purposes, comprising: using said write head or gap in part as a reading device, to produce electrical signals in response to proximal movement of said recording with respect to said write head or gap and using at least a portion of said electrical signals to cause switching of said write head or gap to a write mode of operation in response to predetermined conditions of said signals.
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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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |