US3938183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape signature signal injection device
Assignee: United States Department of the Navy
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Filing: 1974-10-03
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Granted: 1976-02-10
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Expires: 1994-10-03
Abstract
Abstract An apparatus for injecting a signature signal on a magnetic tape comprising signature signal generator connected to a switching system. The switching system connects the signature signal to the recorder inputs while disconnecting the normal recorder inputs. A timer is located in the switching system to permit the injection of the signature signal for a specific time period.
Inventors
- 👤 Donald R. Hust
- 👤 Emory D. Heberling, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:31
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1816; G11B20/182; G11B20/12; G11B20/1201
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
119 words
An apparatus for injecting a signature signal onto a magnetic tape comprising: a. means for generating a signature signal having an output upon which said signature signal appears; b. a plurality of magnetic tape recorder channel input lines one each connected between one pair each of a plurality of first and second recorder inputs; c. switching means for connecting said signature signal generating means output to one one of said plurality of second recorder inputs and disconnecting said plurality of channel input lines from said plurality of second recorder inputs; and d. timing means communicating with said switching means for allowing said switching means to inject said signature signal and disconnect said channel inputs for a specific time period.
Claim 2
Independent Claim
119 words
An apparatus for injecting a signature signal onto a magnetic tape comprising: a. means for generating a signature signal having an output upon which said signature signal appears; b. a plurality of magnetic tape recorder channel input lines one each connected between one pair each of a plurality of first and second recorder inputs; c. switching means for connecting said signature signal generating means output to one one of said plurality of second recorder inputs and disconnecting said plurality of channel input lines from said plurality of second recorder inputs; and d. timing means communicating with said switching means for allowing said switching means to inject said signature signal and disconnect said channel inputs for a specific time period.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 wherein the duration of said specific time period is thirty seconds.
Claim 4
Dependent Claim
117 words
The apparatus of claim 1 wherein said switching means further comprises: a. a first solenoid switch being connected to said timing means, said first solenoid switch being closed during said specific time period of said timing means; b. a second solenoid switch being connected to said first solenoid switch for connecting said signature signal generating means output to each one of said plurality of second recorder inputs when closed, said second solenoid switch being closed when said first solenoid switch is closed; c. a third solenoid switch being connected to said first solenoid switch for disconnecting said plurality of channel input lines from said plurality of second recorder inputs when closed, said third solenoid switch being closed.
Claim 5
Dependent Claim
35 words
The apparatus of claim 1 wherein said switching means further includes a visual and an aural indicator communicating with said timing means, said indicators being actuated during the entire duration of said specific time period.
Claim 6
Dependent Claim
29 words
The apparatus of claim 1 wherein said switching means further includes interrupt means connected to said timing means for terminating said specific time period prior to its normal duration.
Claim 7
Dependent Claim
16 words
The apparatus of claim 1 wherein the duration of said specific time period is thirty seconds.
Claim 8
Dependent Claim
49 words
The apparatus of claim 1 wherein said signature signal includes a sweep signal maintaining a constant amplitude over a swept frequency range of from four-hundred Hertz through two megaHertz, said signature signal containing frequency markers at 621/2 kiloHertz, 125 kiloHertz, 250 kiloHertz, 500 kiloHertz, 1000 kiloHertz, and 2000 kiloHertz.
Claim 9
Dependent Claim
35 words
The apparatus of claim 1 wherein said switching means further includes a visual and an aural indicator communicating with said timing means, said indicator being actuated during the entire duration of said specific time period.
Claim 10
Dependent Claim
29 words
The apparatus of claim 1 wherein said switching means further includes interrupt means connected to said timing means for terminating said specific time period prior to its normal duration.
Claim 11
Dependent Claim
50 words
The apparatus of claim 1 wherein said signature signal includes a sweep signal maintaining at a constant amplitude over a swept frequency range of from four-hundred Hertz through two megaHertz, said signature signal containing frequency markers at 621/2 kiloHertz, 125 kiloHertz, 250 kiloHertz, 500 kiloHertz, 1,000 kiloHertz, and 2,000 kiloHertz.
Claim 12
Independent Claim
128 words
An apparatus for injecting a signature signal onto a magnetic tape comprising: a. means for generating a signature signal and a synchronization signal having a first output upon which said signature signal appears and a second output upon which said synchronization signal appears; b. a plurality of magnetic tape recorder channel lines one each connected between one pair each of a plurality of first and second recorder inputs; c. switching means for connecting said first output of said signature and synchronization signal generating means to all but one of said plurality of second recorder inputs, connecting said second output of said signature and snychronization signal generating means to said remaining second recorder input and disconnecting said plurality of recorder channel lines from said plurality of second recorder inputs.
Claim 13
Independent Claim
128 words
An apparatus for injecting a signature signal onto a magnetic tape comprising: a. means for generating a signature signal and a synchronization signal having a first output upon which said signature signal appears and a second output upon which said synchronization signal appears; b. a plurality of magnetic tape recorder channel lines one each connected between one pair each of a plurality of first and second recorder inputs; c. switching means for connecting said first output of said signature and synchronization signal generating means to all but one of said plurality of second recorder inputs, connecting said second output of said signature and snychronization signal generating means to said remaining second recorder input and disconnecting said plurality of recorder channel lines from said plurality of second recorder inputs.
Claim 14
Dependent Claim
39 words
The apparatus of claim 11 wherein said switching means further includes timing means for permiting said switching means to connect said signature and synchronization signal generating means outputs and disconnect said channel input lines for a specific time period.
Claim 15
Dependent Claim
123 words
The apparatus of claim 12 wherein said switching means further comprises: a. a first solenoid switch being connected to said timing means, said first solenoid switch being closed during said specific time period of said timing means; b. a second solenoid switch being connected to said first solenoid switch for connecting said signature and synchronization signal generating means output to said plurality of second recorder inputs when closed, said second solenoid switch being closed when said first solenoid switch is closed; c. a third solenoid switch being connected to said first solenoid switch for disconnecting said plurality of channel input lines from said plurality of second recorder inputs when closed, said third solenoid switch being closed when said first solenoid switch is closed.
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) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |