US4584618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio recorder which can play back a temporal code irrespective of the speed of the magnetic tape
Assignee: Thales SA
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Filing: 1984-10-09
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Granted: 1986-04-22
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Expires: 2004-10-09
Abstract
Abstract An audio tape recorder comprises, over and above the conventional recording and playback heads, two playback heads incorporated in a rotary drum driven by a servo controlled motor operated by a servo control device. The playback heads are connected to a code word decoder of known kind, supplying synchronizing signals to the servo control device. When the absolute tape running speed is nil or smaller than the its nominal speed, the playback heads turn at a relative speed equal to the nominal tape running speed. When the absolute tape running speed is greater than its nominal speed, the rotary drum is stopped and the servo control device operates to provide positional servo control, as a function of the phase of the synchronizing signals supplied by the decoder.
Inventors
- 👤 Michel Tassery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:54
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/53; G11B5/531; G11B5/535; G11B27/00; G11B27/005; G11B27/02; G11B27/022; G11B27/024; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B27/3036; G11B27/3054; G11B27/32; G11B27/322; G11B27/323; G11B2220/00; G11B2220/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
An audio recorder permitting the reading of a temporal code irrespective of the running speed of the tape, this temporal code being recorded on a track separate from the audio track or tracks, comprising: at least one head for reading the temporal code, in contact with the tape and free to turn along a trajectory sweeping a segment of the temporal code track, a servo controlled motor by means of which the reading head may be made to turn, a servo control device controlling the motor so that a displacement of the reading head always occurs with respect to the temporal code track, irrespective of the absolute speed of displacement of the tape, a temporal code decoder connected to the reading head for decoding the temporal code and for supplying servo control signals to the servo control device.
Claim 2
Dependent Claim
138 words
An audio recorder permitting the reading of a temporal code irrespective of the running speed of the tape, this temporal code being recorded on a track separate from the audio track or tracks, comprising: at least one head for reading the temporal code, in contact with the tape and free to turn along a trajectory sweeping a segment of the temporal code track, a servo controlled motor by means of which the reading head may be made to turn, a servo control device controlling the motor so that a displacement of the reading head always occurs with respect to the temporal code track, irrespective of the absolute speed of displacement of the tape, a temporal code decoder connected to the reading head for decoding the temporal code and for supplying servo control signals to the servo control device.
Claim 3
Dependent Claim
103 words
A tape recorder according to claim 1, in which the servo control device maintains a predetermined relative speed between the reading or playback head and the tape, if the absolute running speed of the tape is smaller than its scheduled value, irrespective of the running direction of the tape, and in which the servo control device determines the position of the reading head as a function of the phase of the signal read on the temporal code track, if the absolute running speed of the tape is greater than or equal to its scheduled value, irrespective of the running direction of the tape.
Claim 4
Dependent Claim
78 words
An audio recorder according to claim 1, comprising a plurality of reading heads evenly distributed over the circumference of a rotary drum, driven by a servo controlled motor, and means for guiding the tape keeping the same in contact with the drum over a sufficient surface to assure that at least one reading head is always in contact with the tape, and that there is always at least one complete word of the temporal code on this surface.
Claim 5
Dependent Claim
52 words
An audio recorder according to claim 3, comprising two reading heads situated at the two extremities of a diameter of the rotary drum, these heads being electrically connected in series, and in which the contact surface of the tape on the drum corresponds to at least half the circumference of the latter.
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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |