US3867702A
Expired / Lapsed
US
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Distortion measuring apparatus
Assignee: Xerox Corp
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Filing: 1973-06-28
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Granted: 1975-02-18
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Expires: 1993-06-28
Abstract
Abstract Apparatus for measuring the distortion introduced to a rectangular wave pulse by a transmission medium. Circuitry is provided for measuring the positive peak value, negative peak value and DC average value of the distorted pulse. The negative peak value and DC average value are subtracted from the positive peak value to give an indication of the delay distortion caused by the transmission medium.
Inventors
- 👤 John D Torpie
- 👤 Allan J Bell
- 👤 Michael L Gorham
- 👤 Walter G Keating
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:18
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/46; H04B3/04; H04B3/14; H04B3/141; H04B3/146; H04B3/148
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
Apparatus for measuring the amount of distortion introduced to a rectangular wave pulse by a transmission medium and providing a signal at an output terminal thereof representative of said distortion, said apparatus comprising means for measuring the positive peak value of the distorted pulse; means for measuring the negative peak value of the distorted pulse; means for measuring the DC average valve of the distorted pulse, and means for summing the positive and the negative peak values and the DC average values to provide an output signal at said output terminal representing a measure of the delay distortion caused by the transmission medium.
Claim 2
Dependent Claim
103 words
Apparatus for measuring the amount of distortion introduced to a rectangular wave pulse by a transmission medium and providing a signal at an output terminal thereof representative of said distortion, said apparatus comprising means for measuring the positive peak value of the distorted pulse; means for measuring the negative peak value of the distorted pulse; means for measuring the DC average valve of the distorted pulse, and means for summing the positive and the negative peak values and the DC average values to provide an output signal at said output terminal representing a measure of the delay distortion caused by the transmission medium.
Claim 3
Dependent Claim
34 words
The distortion measuring apparatus according to claim 1 wherein said summing means is adapted to provide said output signal representing the positive peak value minus the negative peak value minus the DC average value.
Claim 4
Dependent Claim
25 words
ThE distortion measuring apparatus according to claim 2, further including means responsive to said output signal exceeding a predetermined value for grounding said output terminal.
Claim 5
Dependent Claim
108 words
The apparatus according to claim 3 wherein said grounding means includes an operational amplifier having first and second input means and an output means, means for applying said output signal of said summing means to said first input means, DC biasing source applied to said second input means for establishing said predetermined value at said amplifier, and means operatively connected to said operational amplifier for applying said output signal of said summing means to said output terminal of said apparatus when said output signal is below said predetermined value and applying substantially zero potential to the apparatus output terminal when said output signal is above said predetermined value.
Claim 6
Dependent Claim
23 words
The apparatus according to claim 4, wherein said applying means includes a switching means for selectively shunting the output terminal to ground potential.
Claim 7
Dependent Claim
78 words
The apparatus according to claim 5 wherein said switching means includes a transistor connected in a common emitter configuration with its collector electrode connected to the output of said distortion measuring apparatus, means normally biasing said transistor into its non-conducting state when the output of said operational amplifier indicates said output signal is below said predetermined value and into its conductive state when the output of said operational amplifier indicates said output signal is above said predetermined value.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |