US4070647A
Expired / Lapsed
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Error measurement for digital systems
Assignee: BAE Systems Electronics Ltd
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Filing: 1976-04-09
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Granted: 1978-01-24
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Expires: 1996-04-09
Abstract
Abstract The quality of a transmission link is demonstrated by the number of samples of predetermined bit length (N) containing more than one bit in error. The distribution of errors, as it is called is determined by detecting the occurrence of an error, counting the number of bits from one error to the next error, evaluating for each sequence i of errors in which no three consecutive errors span more than (N + 1) bits the sum ##EQU1## WHERE A J = THE NUMBER OF BITS FROM THE JTH ERROR TO THE (J + 1)TH ERROR IN THE SEQUENCE, AND M = THE NUMBER OF ERRORS IN THE SEQUENCE, AND GENERATING THE CUMULATIVE SUM ##EQU2##
Inventors
- 👤 Stephen Ronald Robson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:00
CPC Classifications
G; G06; G06F; G06F17/00; G06F17/10; G06F17/18; H; H04; H04L; H04L1/00; H04L1/24; H04L1/241; H04L1/242
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
A method of determining the number of samples in which the error rate in a bit stream exceeds 1 in N, where N is a predetermined sample size, by the steps of detecting the occurrence of an error in the bit stream, counting the number of bits from each error to the next, evaluating for each sequence (i) of errors in which no three consecutive errors span more than (N + 1) bits, the sum ##EQU7## where a j = the number of bits from the jth error to the (j + 1)th error in the sequence, and m = the number of errors in the sequence, and generating the cumulative sum ##EQU8##
Claim 2
Independent Claim
113 words
A method of determining the number of samples in which the error rate in a bit stream exceeds 1 in N, where N is a predetermined sample size, by the steps of detecting the occurrence of an error in the bit stream, counting the number of bits from each error to the next, evaluating for each sequence (i) of errors in which no three consecutive errors span more than (N + 1) bits, the sum ##EQU7## where a j = the number of bits from the jth error to the (j + 1)th error in the sequence, and m = the number of errors in the sequence, and generating the cumulative sum ##EQU8##
Claim 3
Dependent Claim
82 words
A method as claimed in claim 1 wherein compensation for inaccuracies resulting from any errors occurring within N bits from the beginning of the bit stream is provided by subtracting from S T the amount N - (A 0 + A 1 ) where A 0 is the number of bits from the start of the bit stream to the first error and A 1 is the number of bits from the first error to the second error in the bit stream.
Claim 4
Dependent Claim
80 words
A method as claimed in claim 2 wherein compensation for inaccuracies resulting from any errors occurring within N bits from the end of the bit stream is provided by subtracting from the cumulative sum S T the amount N - (A.sub.z-1 + A.sub.z + 1) where A z-1 equals the number of bits from the penultimate error to the last error, and A z equals the number of bits from the last error to the end of the bit stream.
Claim 5
Dependent Claim
41 words
A method as claimed in claim 1 wherein the sum S T is compared with the total number of samples and the proportion of samples in which the error rate 1 in N is exceeded is indicated on a display means.
Claim 6
Independent Claim
122 words
An apparatus for determining the number of samples in which the error rate in a bit stream exceeds 1 in N, where N is a predetermined sample size, including error detection means for detecting the occurrence of an error in the bit stream, counting means for counting the number of bits from each error to the next, summing means for evaluating, for each sequence (i) of errors in which no three consecutive errors span more than (N + 1) bits, the sum ##EQU9## where a j = the number of bits from the jth error to the (j + 1)th error in the sequence, and m = the number of errors in the sequence, and means for generating the cumulative sum ##EQU10##
Claim 7
Independent Claim
122 words
An apparatus for determining the number of samples in which the error rate in a bit stream exceeds 1 in N, where N is a predetermined sample size, including error detection means for detecting the occurrence of an error in the bit stream, counting means for counting the number of bits from each error to the next, summing means for evaluating, for each sequence (i) of errors in which no three consecutive errors span more than (N + 1) bits, the sum ##EQU9## where a j = the number of bits from the jth error to the (j + 1)th error in the sequence, and m = the number of errors in the sequence, and means for generating the cumulative sum ##EQU10##
Claim 8
Dependent Claim
84 words
An apparatus as claimed in claim 5 wherein means are provided for compensating for inaccuracies resulting from any errors occurring within N bits from the beginning of the bit stream by subtracting from S T the amount N - (A 0 + A 1 ) where A 0 is the number of bits from the start of the bit stream to the first error and A 1 is the number of bits from the first error to the second error in the bit stream.
Claim 9
Dependent Claim
82 words
An apparatus as claimed in claim 5 wherein means are provided for compensating for inaccuracies resulting from any errors occurring within N bits from the end of the bit stream by subtracting from the cumulative sum S T the amount N - (A.sub.z-1 + A.sub.z + 1) where A z-1 equals the number of bits from the penultimate error to the last error, and A z equals the number of bits from the last error to the end of the bit stream.
Claim 10
Dependent Claim
46 words
An apparatus as claimed in claim 5 wherein there is provided comparison means for comparing the sum S T with the total number of samples and display means for indicating the proportion of samples in which the error rate 1 in N is, in operation, exceeded.
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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |