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Patent US3568147A successfully refreshed from Google Patents.
US3568147A
Expired / Lapsed
US
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Transient filter system
Assignee: Boeing North American Inc
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Filing: 1969-03-04
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Granted: 1971-03-02
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Expires: 1989-03-04
Abstract
Abstract Data samples transmitted from one location to another are separated in time and serially compared to determine transmission errors. Several sequential data samples are compared and the intermediate value of the monotonic order is selected as representing the true value. Transient errors which would cause a data sample to be in error are then automatically eliminated and the data sample having the value nearest the data sample caused to be in error is inserted in its place.
Inventors
- 👤 Paul R Gilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:00
CPC Classifications
G; G06; G06F; G06F17/00; G06F17/10; G06F17/17; H; H03; H03K; H03K5/00; H03K5/22; H03K5/26; H04; H04L; H04L1/00; H04L1/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A system for reducing transient errors in transmitted data comprising: means for storing pulse code modulated data signals in serial form during a particular time interval including means for replacing one pulse code modulated data signal with a new pulse code modulated data signal during a succeeding time interval; means for converting from said pulse code modulated data signals in serial form to pulse width modulated signals in parallel form; and digital logic circuit means receiving said pulse width modulated signals representing data signals stored from a particular time interval and a data signal from said succeeding time interval, said logic circuit means providing a pulse width modulated output signal having a pulse width that is between the broadest and narrowest pulse width of said pulse width modulated signals received.
Claim 2
Independent Claim
130 words
A system for reducing transient errors in transmitted data comprising: means for storing pulse code modulated data signals in serial form during a particular time interval including means for replacing one pulse code modulated data signal with a new pulse code modulated data signal during a succeeding time interval; means for converting from said pulse code modulated data signals in serial form to pulse width modulated signals in parallel form; and digital logic circuit means receiving said pulse width modulated signals representing data signals stored from a particular time interval and a data signal from said succeeding time interval, said logic circuit means providing a pulse width modulated output signal having a pulse width that is between the broadest and narrowest pulse width of said pulse width modulated signals received.
Claim 3
Dependent Claim
81 words
The system recited in claim 1 wherein said means for storing comprises a shift register for storing three pulse code modulated data signals in serial form, said means for replacing including logic for shifting one stored data signal out of said shift register and for gating in a new data signal during each time interval whereby said shift register contains two pulse modulated data signals from a preceding time interval and one pulse code-modulated data signal from the succeeding time interval.
Claim 4
Dependent Claim
47 words
The system recited in claim 2 wherein said digital logic circuit means provides as an output signal, the pulse width modulated signal having a pulse width which is between the pulse width of the other two pulse width modulated signals received by said digital logic circuit means.
Claim 5
Independent Claim
173 words
A system for reducing transient errors in transmitted data, said system comprising: means for storing a median data sample selected during a particular time interval; means for receiving first and second data samples during a subsequent time interval, said first and second data samples being serially displaced relative to each other within said subsequent time interval; means for comparing the first and second data samples independently with each other and with the median data sample including means for replacing said median data sample by said first data sample if the following logical conditions are satisfied, (B>A) (A>C) + (B<A) (A<C), and for replacing said median data sample with said second data sample if the following logical conditions are satisfied, (A>B) (B>C) + (A<B) (B<C), and for not replacing said median data sample by either of said first and second data samples if the following logical conditions are satisfied, (B>C) (C>A) + (B<C) (C<A), where A and B are said first and second data samples respectively and where C is said median data sample.
Claim 6
Independent Claim
173 words
A system for reducing transient errors in transmitted data, said system comprising: means for storing a median data sample selected during a particular time interval; means for receiving first and second data samples during a subsequent time interval, said first and second data samples being serially displaced relative to each other within said subsequent time interval; means for comparing the first and second data samples independently with each other and with the median data sample including means for replacing said median data sample by said first data sample if the following logical conditions are satisfied, (B>A) (A>C) + (B<A) (A<C), and for replacing said median data sample with said second data sample if the following logical conditions are satisfied, (A>B) (B>C) + (A<B) (B<C), and for not replacing said median data sample by either of said first and second data samples if the following logical conditions are satisfied, (B>C) (C>A) + (B<C) (C<A), where A and B are said first and second data samples respectively and where C is said median data sample.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |