US3585314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Facility for compensating cross-talk in multitrack magnetic heads
Assignee: Staar SA
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Filing: 1968-10-09
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Granted: 1971-06-15
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Expires: 1988-10-09
Abstract
Abstract A magnetic tape reading facility for compensating crosstalk between tracks including a switch arrangement for selectively coupling impedances to the reading heads and coils to generate voltages equal and opposite to the crosstalk voltages.
Inventors
- 👤 Tadeusz Korn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:58
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/008; G11B5/00813; G11B5/00817; G11B27/00; G11B27/10; G11B27/102; G11B27/107; G11B5/00821; G11B5/00826; G11B5/0083; G11B5/02; G11B5/48; G11B5/49; G11B5/4969; G11B5/4992
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
191 words
A facility providing for compensating of crosstalk and comprising multitrack magnetic heads, circuits including reader coils operatively associated with said heads, said coils and associated heads constituting respective readers, and means for generating a compensation voltage in the circuit of each reader coil, one of the heads being selectively an active head to read a signal from an adjacent track, the compensating voltage being equal in amplitude but opposite in phase to a crosstalk voltage induced in the coil associated with the active head by stray magnetic flux from an adjacent inactive head, said means including an impedance common to said coils and a load impedance for each respective coil selectively associated with said adjacent inactive head, each said coil including a pair of terminals, one of the terminals of the coil of the adjacent active head being adapted for connection to a signal supply source, the other terminal of the latter said coil and one terminal of the coil associated with the adjacent inactive head being connected across said common impedance and the other terminal of the coil associated with the adjacent inactive head being connected across said load impedance.
Claim 2
Dependent Claim
191 words
A facility providing for compensating of crosstalk and comprising multitrack magnetic heads, circuits including reader coils operatively associated with said heads, said coils and associated heads constituting respective readers, and means for generating a compensation voltage in the circuit of each reader coil, one of the heads being selectively an active head to read a signal from an adjacent track, the compensating voltage being equal in amplitude but opposite in phase to a crosstalk voltage induced in the coil associated with the active head by stray magnetic flux from an adjacent inactive head, said means including an impedance common to said coils and a load impedance for each respective coil selectively associated with said adjacent inactive head, each said coil including a pair of terminals, one of the terminals of the coil of the adjacent active head being adapted for connection to a signal supply source, the other terminal of the latter said coil and one terminal of the coil associated with the adjacent inactive head being connected across said common impedance and the other terminal of the coil associated with the adjacent inactive head being connected across said load impedance.
Claim 3
Dependent Claim
52 words
A facility according to claim 1 comprising selection means which selectively disconnects the readers of the tracks, and switches coupled with the selection means to connect load impedances across the disconnected readers, the load impedances having values corresponding to the magnetic coupling coefficient between each crosstalk generating reader and the active reader.
Claim 4
Dependent Claim
97 words
A facility according to claim 2, wherein the selection means includes switches whereby when readout is selected from a number of tracks read by a multitrack head between whose rEaders there is a stray magnetic coupling of various values 1k and k''), and when the readout is selected by one said switch, other of the switches connect the disconnected terminal to the common impedance of the coil of each of the adjacent readers and are coupled with a load impedance Z10 or Z10) which corresponds to the coupling coefficient between the reader selected and each adjacent reader.
Claim 5
Dependent Claim
67 words
A facility according to claim 1 wherein the common impedance has a value with respect to that of the load impedance, allowing for the internal impedance (Zi) of the crosstalk voltage generating reader coil and the stray magnetic coupling coefficient between the active and adjacent readers, such that the voltage generated across the common impedance is equal in amplitude and opposite in phase to the crosstalk voltage.
Claim 6
Dependent Claim
62 words
A facility according to claim 4, wherein the ratio between the values of the impedances is expressed by the formula: Z9 k (Zi+ Z10) (1-k) in which: K is the stray magnetic coupling coefficient between the active and adjacent readers, Z1 is the internal impedance of the stray flux-generating reader coil, Z9 is the common impedance, and Z10 is the load impedance.
Claim 7
Dependent Claim
29 words
A facility according to claim 5, wherein the common impedance is a resistance and the load impedance includes a resistance and a capacitor parallel to the latter said resistance.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |