Patent US4710957A successfully refreshed from Google Patents.
US4710957A
Expired / Lapsed
US
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Data detection by statistical analysis
Assignee: Motorola Solutions Inc
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Filing: 1986-04-30
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Granted: 1987-12-01
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Expires: 2006-04-30
Abstract
Abstract A data detector is disclosed wherein a received signal is analyzed to determine its statistical characteristics. These characteristics are compared to a predetermined statistical distribution. If the signal is statistically close to the statistical characteristics of a known signal a detect signal is generated and the received signal is passed for further processing and reception.
Inventors
- 👤 Paul M. Bocci
- 👤 Carl M. Pietrzak, Jr.
- 👤 Alan L. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:02
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/06; H04B14/066
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
A method for detecting a digital signal from a received signal to provide a detect signal, comprising the steps of: (a) storing the received signal to provide a stored signal; (b) parsing said stored signal to provide a plurality of segments; (c) parsing each of said segments into a plurality of sub-segments each having a predetermined length; (d) tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; (e) computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; (f) summing said plurality of differences to provide a quality signal; (g) comparing said quality signal to a predetermined threshold; (h) providing the detect signal in response to step (g).
Claim 2
Independent Claim
133 words
A method for detecting a digital signal from a received signal to provide a detect signal, comprising the steps of: (a) storing the received signal to provide a stored signal; (b) parsing said stored signal to provide a plurality of segments; (c) parsing each of said segments into a plurality of sub-segments each having a predetermined length; (d) tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; (e) computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; (f) summing said plurality of differences to provide a quality signal; (g) comparing said quality signal to a predetermined threshold; (h) providing the detect signal in response to step (g).
Claim 3
Independent Claim
160 words
A method for detecting a digital signal from a received signal to provide a detect signal, comprising the steps of: (a) storing the received signal to provide a stored signal; (b) parsing said stored signal into segments having a predetermined length; (c) parsing each of said segments into a plurality of sub-segments having a predetermined length; (d) tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; (e) computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; (f) summing said plurality of differences to provide a quality signal; (g) averaging said quality signal with previous quality signals to provide an averaged quality signal; (h) comparing said averaged quality signal to a predetermined threshold to provide the detect signal; (i) repeating steps (d) through (h) until all of said segments of said stored signal are evaluated.
Claim 4
Independent Claim
160 words
A method for detecting a digital signal from a received signal to provide a detect signal, comprising the steps of: (a) storing the received signal to provide a stored signal; (b) parsing said stored signal into segments having a predetermined length; (c) parsing each of said segments into a plurality of sub-segments having a predetermined length; (d) tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; (e) computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; (f) summing said plurality of differences to provide a quality signal; (g) averaging said quality signal with previous quality signals to provide an averaged quality signal; (h) comparing said averaged quality signal to a predetermined threshold to provide the detect signal; (i) repeating steps (d) through (h) until all of said segments of said stored signal are evaluated.
Claim 5
Independent Claim
130 words
An apparatus for detecting a digital signal from a received signal to provide a detect signal, comprising: means for storing the received signal to provide a stored signal; means for parsing said stored signal into segments having a predetermined length; means for parsing a segment into a plurality of sub-segments having a predetermined length; means for tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; means for computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; and means for summing said plurality of differences to provide a quality signal; means for comparing said quality signal to a predetermined threshold to provide a detect signal.
Claim 6
Independent Claim
130 words
An apparatus for detecting a digital signal from a received signal to provide a detect signal, comprising: means for storing the received signal to provide a stored signal; means for parsing said stored signal into segments having a predetermined length; means for parsing a segment into a plurality of sub-segments having a predetermined length; means for tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; means for computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; and means for summing said plurality of differences to provide a quality signal; means for comparing said quality signal to a predetermined threshold to provide a detect signal.
Claim 7
Independent Claim
142 words
An apparatus for detecting a digital signal from a received signal, comprising: means for storing the received signal to provide a stored signal; means for parsing said stored signal into segments having a predetermined length; means for parsing a segment into a plurality of sub-segments having a predetermined length; means for tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; means for computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; and means for summing said plurality of differences to provide a quality signal; means for averaging said quality signal with previous quality signals to provide an averaged quality signal; means for comparing said averaged quality signal to a predetermined threshold to provide a detect signal.
Claim 8
Independent Claim
142 words
An apparatus for detecting a digital signal from a received signal, comprising: means for storing the received signal to provide a stored signal; means for parsing said stored signal into segments having a predetermined length; means for parsing a segment into a plurality of sub-segments having a predetermined length; means for tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; means for computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; and means for summing said plurality of differences to provide a quality signal; means for averaging said quality signal with previous quality signals to provide an averaged quality signal; means for comparing said averaged quality signal to a predetermined threshold to provide a detect signal.
Claim 9
Dependent Claim
157 words
In a secure communication system, a method for detecting an encrypted signal from a received signal and for providing a decrypted information signal, comprising the steps of: (a) storing the received signal to provide a stored signal; (b) parsing said stored signal into segments having a predetermined length; (c) parsing each of said segments into a plurality of sub-segments having a predetermined length; (d) tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; (e) computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; (f) summing said plurality of differences to provide a quality signal; (g) comparing said quality signal to a predetermined threshold to provide a signal representing the detection of an encrypted signal; (h) operating, in response to step (g), upon said received signal to provide the decrypted information signal.
Claim 10
Dependent Claim
157 words
In a secure communication system, a method for detecting an encrypted signal from a received signal and for providing a decrypted information signal, comprising the steps of: (a) storing the received signal to provide a stored signal; (b) parsing said stored signal into segments having a predetermined length; (c) parsing each of said segments into a plurality of sub-segments having a predetermined length; (d) tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; (e) computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; (f) summing said plurality of differences to provide a quality signal; (g) comparing said quality signal to a predetermined threshold to provide a signal representing the detection of an encrypted signal; (h) operating, in response to step (g), upon said received signal to provide the decrypted information signal.
Claim 11
Dependent Claim
171 words
A receiver for use in a secure communication system, said receiver having means for detecting an encrypted signal from a received signal, and mean for decrypting said encrypted signal to recover an information signal, comprising: means for storing the received signal to provide a stored signal; means for parsing said stored signal into segments having a predetermined length; means for parsing a segment into a plurality of sub-segments having a predetermined length; means for tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; means for computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; means for summing said plurality of differences to provide a quality signal; means for comparing said quality signal to a predetermined threshold to provide a signal representing the detection of an encrypted signal; and means for operating upon said received signal to decrypt said encrypted signal to recover said information signal.
Claim 12
Dependent Claim
171 words
A receiver for use in a secure communication system, said receiver having means for detecting an encrypted signal from a received signal, and mean for decrypting said encrypted signal to recover an information signal, comprising: means for storing the received signal to provide a stored signal; means for parsing said stored signal into segments having a predetermined length; means for parsing a segment into a plurality of sub-segments having a predetermined length; means for tallying the number of occurrences of each of a plurality of predetermined bit patterns defined by said predetermined length of said sub-segments; means for computing the difference of each of said tallied occurrences to a predetermined expected value of occurrences to provide a plurality of differences; means for summing said plurality of differences to provide a quality signal; means for comparing said quality signal to a predetermined threshold to provide a signal representing the detection of an encrypted signal; and means for operating upon said received signal to decrypt said encrypted signal to recover said information signal.
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) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |