Patent US3307586A successfully refreshed from Google Patents.
Patent US3174100A successfully refreshed from Google Patents.
Patent US3573779A successfully refreshed from Google Patents.
US3573779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Record-level indicator
Assignee: United States Department of the Navy
•
Filing: 1968-03-19
•
Granted: 1971-04-06
•
Expires: 1988-03-19
Abstract
Abstract A device for monitoring input levels to a tape recorder having two channels fed by a common input. At a preset peak input level in each channel, an indicator light is triggered. The triggering is accomplished by direct-coupling a voltage amplifier to a Schmitt trigger. When recording, at the proper input level, one channel is adjusted so that its indicator is displaying while the other channel is adjusted so its indicator is not displaying.
Inventors
- 👤 Oliver H Mcdaniel
- 👤 James H Prout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:54
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
249 words
A record-level indicator unit comprising: a first channel fOr receiving an input signal and including a Schmitt trigger for responding to a preset voltage level, a voltage amplifier for coupling said input signal to said Schmitt trigger, and a potentiometer for direct coupling said input signal to said voltage amplifier; a second channel separate and distinct from said first channel for receiving said input signal and including a Schmitt trigger for responding to a preset voltage level differing from said preset voltage level of said first channel, a voltage amplifier for coupling said input signal to said Schmitt trigger, and a potentiometer for direct coupling said input signal to said voltage amplifier; means in said first channel for indicating whether said preset level of said first channel has been reached; means in said second channel for indicating whether said preset level of said second channel has been reached; amplifier means in said first channel for driving said indicating means when said preset level of said first channel has been reached; amplifier means in said second channel for driving said indicating means when said preset level of said second channel has been reached; means in said first channel for automatically resetting after a predetermined time said first channel indicating means if said preset voltage of said first channel has been reached; and means in said second channel for automatically resetting after a predetermined time said second channel indicating means if said preset voltage of said second channel has been reached.
Claim 2
Dependent Claim
249 words
A record-level indicator unit comprising: a first channel fOr receiving an input signal and including a Schmitt trigger for responding to a preset voltage level, a voltage amplifier for coupling said input signal to said Schmitt trigger, and a potentiometer for direct coupling said input signal to said voltage amplifier; a second channel separate and distinct from said first channel for receiving said input signal and including a Schmitt trigger for responding to a preset voltage level differing from said preset voltage level of said first channel, a voltage amplifier for coupling said input signal to said Schmitt trigger, and a potentiometer for direct coupling said input signal to said voltage amplifier; means in said first channel for indicating whether said preset level of said first channel has been reached; means in said second channel for indicating whether said preset level of said second channel has been reached; amplifier means in said first channel for driving said indicating means when said preset level of said first channel has been reached; amplifier means in said second channel for driving said indicating means when said preset level of said second channel has been reached; means in said first channel for automatically resetting after a predetermined time said first channel indicating means if said preset voltage of said first channel has been reached; and means in said second channel for automatically resetting after a predetermined time said second channel indicating means if said preset voltage of said second channel has been reached.
Claim 3
Dependent Claim
18 words
A record level indicator unit as in claim 1 wherein said means for indicating includes a pilot light.
Claim 4
Dependent Claim
18 words
A record level indicator unit as in claim 3 wherein said means for indicating further includes an annunciator.
Claim 5
Dependent Claim
33 words
A record-level indicator unit as in claim 1 wherein said means for automatically resetting is a monostable multivibrator and wherein said predetermined time is set by the timing capacitor of said monostable multivibrator.
Claim 6
Independent Claim
278 words
A device for monitoring input levels to a tape recorder during the recording of repetitive transients comprising: a first channel for receiving an input signal from a suitable point in the record electronics of said tape recorder and for responding to a preset voltage level, said first channel including a Schmitt trigger for responding to said preset voltage level, a voltage amplifier for coupling said input signal to said Schmitt trigger, and a potentiometer for direct coupling said input signal to said Schmitt trigger via said voltage amplifier; a second channel separate and distinct from said first channel for receiving said aforementioned input signal and for responding to a preset voltage level differing from said preset level of said first channel, said second channel including a Schmitt trigger for responding to said differing preset voltage level, a voltage amplifier for coupling said input signal to said Schmitt trigger, and a potentiometer for direct coupling said input signal to said Schmitt trigger via said voltage amplifier; separate and distinct indicating means connected to said first channel and said second channel, respectively, for visually indicating whether the preset levels of said first and of said second channels have been reached, respectively; separate and distinct amplifier means connected to said first channel and said second channel, respectively, for driving said indicating means; and separate and distinct monostable multivibrators connected between said Schmitt trigger and said driver means of said first channel and said second channel for automatically resetting after a predetermined time said first channel indicating means and said second channel indicating means, respectively, when each has reached its preset voltage level whereby said transient signals are continuously and accurately recorded.
Claim 7
Independent Claim
278 words
A device for monitoring input levels to a tape recorder during the recording of repetitive transients comprising: a first channel for receiving an input signal from a suitable point in the record electronics of said tape recorder and for responding to a preset voltage level, said first channel including a Schmitt trigger for responding to said preset voltage level, a voltage amplifier for coupling said input signal to said Schmitt trigger, and a potentiometer for direct coupling said input signal to said Schmitt trigger via said voltage amplifier; a second channel separate and distinct from said first channel for receiving said aforementioned input signal and for responding to a preset voltage level differing from said preset level of said first channel, said second channel including a Schmitt trigger for responding to said differing preset voltage level, a voltage amplifier for coupling said input signal to said Schmitt trigger, and a potentiometer for direct coupling said input signal to said Schmitt trigger via said voltage amplifier; separate and distinct indicating means connected to said first channel and said second channel, respectively, for visually indicating whether the preset levels of said first and of said second channels have been reached, respectively; separate and distinct amplifier means connected to said first channel and said second channel, respectively, for driving said indicating means; and separate and distinct monostable multivibrators connected between said Schmitt trigger and said driver means of said first channel and said second channel for automatically resetting after a predetermined time said first channel indicating means and said second channel indicating means, respectively, when each has reached its preset voltage level whereby said transient signals are continuously and accurately recorded.
References Cited (Backward Citations)
US3170689A
Cited
US3341816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |