US4484291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Comparison circuit for determining the statistical equality of two analog signals
Assignee: USPHILIPS Corp A CORP OF
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Filing: 1981-10-21
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Granted: 1984-11-20
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Expires: 2001-10-21
Abstract
Abstract Signal comparison arrangement for comparing a first and a second analog signal with each other. For each of these signals the number of zero-crossings occurring within each measuring interval of a sequence of N consecutive measuring intervals T(1), T(2), . . . T(N) is counted. The N numbers x(1), x(2), . . . x(N) which represent the numbers of zero-crossings of the first analog signal in the consecutive measuring intervals T(1), T(2), . . . T(N) and the N numbers y(1), y(2), . . . y(N) which represent these numbers of zero-crossings of the second analog signal in the said measuring intervals, are applied to a programmable computer which determines the value of a statistical quantity by means of these 2N numbers and compares this value with a threshold value. This statistical quantity may be formed by the directional coefficient of a straight line which is closest to either the N numbers x(n), or the N numbers y(n), but may alternatively be formed by the correlation coefficient.
Inventors
- 👤 Theodoor A. J. Schlosser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:36
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/0008; H03J1/0058; H03J1/0083; G; G01; G01R; G01R19/00; G01R19/0038; G06; G06J; G06J1/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
241 words
A signal comparison circuit for comparing a first and a second analog signal with each other, characterized by: (a) a first and a second signal processing channel each having: i--an input port to which one or other of said analog signals are applied, ii--an output port; iii--a zero-crossing detector the input of which is coupled to the input of the signal processing channel; iv--a counter circuit the input of which is connected to the output of the zero-crossing detector and the output of which is coupled to the output of the signal processing channel and which is arranged to count all the zero-crossings occurring within a measuring time interval T(n) wherein n=1, 2, 3, . . . N of a number of N measuring time intervals T(1), T(2), . . . T(N) and for producing a number which indicates the number of zero-crossings which occurred in this measuring time interval T(n); (b) a computer which is coupled to the two output ports of the two signal processing channels and is arranged to: i--receive the N numbers produced by the counter circuit in the first signal processing channel and the N numbers produced by the counter circuit in the second signal processing channel; ii--determine by means of these numbers the value of a statistical quantity; iii--produce a first and a second signal, respectively, when the value of this statistical quantity is higher than, respectively lower than or equal to a threshold value.
Claim 2
Dependent Claim
241 words
A signal comparison circuit for comparing a first and a second analog signal with each other, characterized by: (a) a first and a second signal processing channel each having: i--an input port to which one or other of said analog signals are applied, ii--an output port; iii--a zero-crossing detector the input of which is coupled to the input of the signal processing channel; iv--a counter circuit the input of which is connected to the output of the zero-crossing detector and the output of which is coupled to the output of the signal processing channel and which is arranged to count all the zero-crossings occurring within a measuring time interval T(n) wherein n=1, 2, 3, . . . N of a number of N measuring time intervals T(1), T(2), . . . T(N) and for producing a number which indicates the number of zero-crossings which occurred in this measuring time interval T(n); (b) a computer which is coupled to the two output ports of the two signal processing channels and is arranged to: i--receive the N numbers produced by the counter circuit in the first signal processing channel and the N numbers produced by the counter circuit in the second signal processing channel; ii--determine by means of these numbers the value of a statistical quantity; iii--produce a first and a second signal, respectively, when the value of this statistical quantity is higher than, respectively lower than or equal to a threshold value.
Claim 3
Dependent Claim
42 words
A signal comparison circuit as claimed in claim 1, characterized in that the statistical quantity is formed by the directional coefficient of a straight line which is closest to the numbers produced by the counter circuit in the first signal processing channel.
Claim 4
Dependent Claim
21 words
A signal processing circuit as claimed in claim 1, characterized in that the statistical quantity is formed by the correlation coefficient.
Claim 5
Dependent Claim
42 words
A signal comparison circuit as claimed in claim 1, characterized in that the statistical quantity is formed by the directional coefficient of a straight line which is closest to the numbers produced by the counter circuit in the second signal processing channel.
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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |