US3840890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for recording and reproducing analog data
Assignee: Mirion Technologies Capintec Inc
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Filing: 1972-05-30
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Granted: 1974-10-08
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Expires: 1992-05-30
Abstract
Abstract Apparatus for recording and reproducing analog data, the apparatus having means for generating a modified ramp waveform and means in circuit for comparing an input signal representing the analog data with the modified ramp waveform and for producing an output signal to be recorded wherein the output signal has characteristics representative of the analog data. Apparatus for reproducing the analog data receives a signal from a recording device and includes pulse discriminator means for receiving an amplified signal from the recording device, a bistable circuit in operative relationship with the discriminator means and filtering means for filtering a carrier waveform from the output of the bistable circuit and for providing a signal that accurately reproduces the analog data originally received.
Inventors
- 👤 J Sunderland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:26
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/02; G11B20/08; G11B23/00; G11B23/0007
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
209 words
Apparatus for recording and reproducing analog data, comprising: input terminals for receiving analog data input signals; limiter means for limiting the voltage level of said input signals; ramp generator means for generating a ramp voltage signal having both positive-going and negative-going portions, the frequency of said ramp voltage signal being in excess of that of said input signals; ramp modification means for receiving the ramp voltage signal from said ramp generator means and for issuing and algebraically impressing on said ramp voltage signal, positive-going and negative-going peaks at locations on said ramp voltage signal where the magnitude is in excess of a predetermined threshold, said peaks being of a magnitude in excess of the limited voltage level of said input signals; comparator means for receiving said analog data input signals after being limited by said limiter means, for receiving said ramp voltage signal after being modified by said ramp modification means, for comparing said limited input sigals with said modified ramp voltage signals, and for issuing a pulse when the magnitude of said limited input signal exceeds the magnitude of said modified ramp voltage signal; and feedback means to ensure that only one pulse is issued by said comparator means for each period of said modified ramp voltage signal.
Claim 2
Dependent Claim
209 words
Apparatus for recording and reproducing analog data, comprising: input terminals for receiving analog data input signals; limiter means for limiting the voltage level of said input signals; ramp generator means for generating a ramp voltage signal having both positive-going and negative-going portions, the frequency of said ramp voltage signal being in excess of that of said input signals; ramp modification means for receiving the ramp voltage signal from said ramp generator means and for issuing and algebraically impressing on said ramp voltage signal, positive-going and negative-going peaks at locations on said ramp voltage signal where the magnitude is in excess of a predetermined threshold, said peaks being of a magnitude in excess of the limited voltage level of said input signals; comparator means for receiving said analog data input signals after being limited by said limiter means, for receiving said ramp voltage signal after being modified by said ramp modification means, for comparing said limited input sigals with said modified ramp voltage signals, and for issuing a pulse when the magnitude of said limited input signal exceeds the magnitude of said modified ramp voltage signal; and feedback means to ensure that only one pulse is issued by said comparator means for each period of said modified ramp voltage signal.
Claim 3
Dependent Claim
38 words
Apparatus as in claim 1, wherein said comparator means is an operational amplifier which changes from a first to a second state when the magnitude of the limited input signal exceeds that of the modified ramp voltage signal.
Claim 4
Dependent Claim
43 words
Apparatus as in claim 1, wherein said ramp modification means impresses positive peaks when said ramp voltage signal reaches substantially two-thirds of its maximum positive excursion, and impresses negative peaks when said ramp voltage signal reaches substantially two-thirds of its maximum negative excursion.
Claim 5
Dependent Claim
159 words
Apparatus as in claim 1, and further comprising amplifier means for receiving and amplifying the pulses issued by said comparitor means; first discriminator means for detecting positive pulses amplified by said amplifier means and for issuing a signal of a first polarity in response thereto; second discriminator means for detecting negative pulses amplified by said amplifier means, and for issuing a signal of a second and opposite polarity in response thereto; a bistable sensing circuit for receiving the signals issued by said first and said second discriminator means, for changing states when receiving alternating polarity signals from said first and second discriminator means, and for issuing a clamped voltage signal of a first state in response to said first polarity and of a second state in response to said second polarity; and filter means for receiving the clamped voltage signals from said bistable sensing circuit, for smoothing the same, and for filtering all carrier signals out of the same.
Claim 6
Dependent Claim
74 words
Apparatus as in claim 4 wherein said discriminators are zero-crossing discriminators that are each armed by a first part of a respective pulse from said amplifier means passing a predetermined threshold level of selected polarity and wherein the discriminators are coupled in circuit to each receive respective hold-off signals from said bistable circuit to protect the discriminators from firing on the second part of a pulse of opposite polarity from said respective pulse. >
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |