US3761646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording and reading device with head movement for compensation of irregularities in tape speed
Assignee: ARG AG
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Filing: 1972-08-14
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Granted: 1973-09-25
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Expires: 1992-08-14
Abstract
Abstract This invention relates to a recording or reading device for electrical signals which are recorded on or read from a record carrier, such as a magnetic tape, which travels past a record and/or read head. The invention is directed to the problem of irregularities in the speed of travel of the record carrier past a record or read head, and provides means for compensating for irregularities in the speed of travel. Such means comprise a pulse generator whose instantaneous frequency is a function of the speed of travel of the record carrier, a master oscillator supplying reference frequency pulses, and a phase comparison device for comparing the two series of pulses and producing a compensating signal. The compensation may be effected by mechanical movement of the record/read head under the control of the output from the phase comparison device, or electronically by a deformation of the time scale of the signals to be recorded or read in order to cause it to conform to instantaneous variations in the speed of the carrier, or by a combination of both of these methods.
Inventors
- 👤 J Beauviala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/584; G11B5/588; G11B15/00; G11B15/18; G11B15/1808; G11B15/46; G11B15/54; G11B20/00; G11B20/00007
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
162 words
A device for recording and/or reading an electric signal evolving in time on a record carrier by means of a record/read head, said device comprising an electric pulse signal generator means whose instantaneous frequency is a function of the instantaneous speed of travel of the said carrier past the head, an oscillator adapted for supplying a variable frequency pulse signal, an integrator means, a phase comparator means for comparing the respective frequencies of the said generator means and the said oscillator and coupled by said integrator means to said oscillator and controlling said oscillator in order to cause the oscillator to supply a signal whose frequency is equal to the average frequency of the instantaneous signals supplied by the said generator means, and further means responsive to said comparator means for adjusting said electric signal according to the comparison of said frequencies and thereby to the speed of said tape, said oscillator generating frequencies corresponding to the means speed of said tape.
Claim 2
Independent Claim
162 words
A device for recording and/or reading an electric signal evolving in time on a record carrier by means of a record/read head, said device comprising an electric pulse signal generator means whose instantaneous frequency is a function of the instantaneous speed of travel of the said carrier past the head, an oscillator adapted for supplying a variable frequency pulse signal, an integrator means, a phase comparator means for comparing the respective frequencies of the said generator means and the said oscillator and coupled by said integrator means to said oscillator and controlling said oscillator in order to cause the oscillator to supply a signal whose frequency is equal to the average frequency of the instantaneous signals supplied by the said generator means, and further means responsive to said comparator means for adjusting said electric signal according to the comparison of said frequencies and thereby to the speed of said tape, said oscillator generating frequencies corresponding to the means speed of said tape.
Claim 3
Dependent Claim
28 words
A device as claimed in claim 1 wherein said head is displaceable, comprising means responsive to said phase comparator means for displacing said head relative to said carrier.
Claim 4
Dependent Claim
64 words
Reading device according to claim 1 wherein said further means comprises storage means controlled by the said phase comparator means and wherein a signal to be read is introduced into the storage means at a frequency corresponding to the frequency of the signal from the generator means and emerges from the storage means at a frequency corresponding to the frequency of the said oscillator.
Claim 5
Dependent Claim
34 words
Reading device according to claim 3 wherein said further means comprises a digital-to-analogue converter on the input side of said storage means and an analogue-to-digital converter on the output side of said storage means.
Claim 6
Dependent Claim
111 words
A device according to claim 1, wherein the said generator means comprises a disc carrying equidistant marks around its periphery and which is driven in rotation by the said record carrier about an axis at right angles to the direction of travel of the carrier, and a converter transforming each of the marks which travel past it into an electric pulse, and wherein the said head is attached to the said converter in order to form therewith a movable assembly which can rotate about the axis of the disc, said device further comprising a motor supplied by the output signal from the phase comparator means, said motor driving said movable assembly.
Claim 7
Dependent Claim
29 words
A device according to claim 5 wherein the motor is a solenoid including a rod system and an adjustable core connected to the said assembly by said rod system.
Claim 8
Dependent Claim
65 words
Recording device according to claim 1 wherein said further means comprises storage means controlled by the said phase comparator means and wherein a signal to be recorded is introduced into the storage means at a frequency corresponding to the frequency of the said oscillator and emerges from the storage means at a frequency corresponding to the frequency of the signal from the said generator means.
Claim 9
Dependent Claim
34 words
Recording device according to claim 7 wherein said further means comprises an analogue-to-digit converter on the input side of said storage means and a digitial-to-analogue converter on the output side of said storage means.
Claim 10
Dependent Claim
113 words
A device according to claim 8, wherein the device regulated by the said shift register includes elements having two stable states each of which comprises first means to receive the said control pulse, second means so that when it receives this control pulse, a digit of a first type causes it to pass from the first state to the second state and so that a digit of second type retains it in the first state and third means enabling when it changes from the first state to the second state to reset the element which precedes it in the direction of movement of the digits, from the second state to the first state.
Claim 11
Dependent Claim
273 words
Recording device according to claim 7 wherein the phase comparator means and the storage means forms a shift register and wherein the signal to be recorded enters the shift register at the frequency of the oscillator and emerges at the frequency of the generator means, said device further comprising a control device comprising n electronic elements having two stable states connected in cascade betwen an input for a first pulse signal and an input for a second pulse signal both moving step-by-step in opposite sense through the said device by successive triggering of the said elements and a regulated device for the circulation of information comprising at least one series of n elements also connected in cascade between an input and an output for information, each of the said elements of the regulated device being controlled by one of the elements of the control device, each of which comprises first means so that a pulse from the signal causes it to change from the first state to the second state or maintains it in the said second state, second means so that a pulse from the second signal causes it to pass from the second state to the first state or maintains it in the said first state, third means enabling, when it changes from the first state to the second state, to reset the element which precedes it in the direction of propagation of the first signal from the second state to the first state and fourth means sending a control pulse to the element associated with the said regulated device when it changes from the first state to the second state.
Claim 12
Dependent Claim
114 words
A device according to claim 10 wherein the device regulated by the said shift register includes elements having two stable states each of which comprises first means to receive the said control pulse, second means so that when it receIves this control pulse, a digit of a first type causes it to pass from the first state to the second state and so that a digit of a second type retains it in the first state and third means enabling when it changes from the first state to the second state to reset the element which precedes it in the direction of movement of the digits, from the second state to the first state.
Claim 13
Dependent Claim
255 words
A device according to claim 10 wherein the phase comparator means and the storage means form a shift register and wherein the signal to be reproduced enters the shift register at the frequency of the generator and emerges at the frequency of the oscillator, said device further comprising a control device comprising n electronic elements having two stable states connected in cascade between an input for a second pulse signal both moving step-by-step in opposite sense through the said device by successive triggering of the said elements and a regulated device for the circulation of information comprising at least one series of n elements also connected in cascade between an input and an output for information, each of the said elements of the regulated device being controlled by one of the elements of the control device, each of which comprises first means so that a pulse from the first signal causes it to change from the first state to the second state or maintains it in the said second state, second means so that a pulse from the second signal causes it to pass from the second state to the first means enabling, when it changes from the first state to the second state, to reset the element which precedes it in the direction of propagation of the first signal from the second state to the first state and fourth means sending a control pulse to the element associated with the said regulated device when it changes from the first state to the second state.
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |