Patent US2342588A successfully refreshed from Google Patents.
US4052557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase-jump detector and corrector method and apparatus for phase-modulated communication systems that also provides a signal quality indication
Assignee: Racal Data Communications Inc
•
Filing: 1975-07-31
•
Granted: 1977-10-04
•
Expires: 1995-07-31
Abstract
Abstract In a phase-modulated communication system utilizing voice-band communication channels wherein phase-jumps may be experienced, a phase-jump detector indicates the occurrence of such phase-jumps. A phase-jump corrector responds to the persistence of a phase-jump condition by correcting for it without requiring shut-down and complete reequalization of the transmission channel. Monitoring of the incoming signal for phase-jump occurrence provides a convenient signal quality indication that represents the magnitude of the error in the X and Y components of each received symbol.
Inventors
- 👤 Ran-Fun Chiu
- 👤 James Bryon Sherman
- 👤 Judson Truman Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:54
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
131 words
A method for detecting the occurrence of phase-jumps in a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, said method comprising: generating an error X and error Y indication that represents the difference between the binary X and binary Y components of a received symbol and the ideal binary X and binary Y components of that symbol; generating a rotated error X and rotated error Y indication that represents the difference between the binary X and binary Y components of and received symbol rotated by N degrees and the ideal binary X and binary Y components of the rotated symbol; and comparing the magnitude of the error X and error Y indication with the rotated error X and rotated error Y indication.
Claim 2
Independent Claim
131 words
A method for detecting the occurrence of phase-jumps in a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, said method comprising: generating an error X and error Y indication that represents the difference between the binary X and binary Y components of a received symbol and the ideal binary X and binary Y components of that symbol; generating a rotated error X and rotated error Y indication that represents the difference between the binary X and binary Y components of and received symbol rotated by N degrees and the ideal binary X and binary Y components of the rotated symbol; and comparing the magnitude of the error X and error Y indication with the rotated error X and rotated error Y indication.
Claim 3
Dependent Claim
51 words
The method of claim 1 wherein said error X and error Y generating step includes: receiving the binary X and binary Y component of the received symbol; and subtracting the ideal binary Y component and binary Y component of the received symbol from the received binary X and binary Y component.
Claim 4
Dependent Claim
42 words
The method of claim 2 further comprising, after said receiving step: addressing a memory means with the binary X and binary Y components of the received symbol, said memory containing the ideal binary X and binary Y component of the received symbol.
Claim 5
Dependent Claim
67 words
The method of claim 1 wherein said rotated error X and rotated error Y generating step includes: receiving the binary X and binary Y component of the received symbol; modifying the received binary X and binary Y components to represent the received symbol rotated by N degrees; and subtracting the ideal rotated binary X and binary Y component from the modified binary X and binary Y component.
Claim 6
Dependent Claim
53 words
The method of claim 4 wherein said modifying step comprises: multiplying the received binary X component minus the received binary Y component by 0.707 to obtain the rotated binary X component; and multiplying the received binary X component plus the received binary Y component by 0.707 to obtain the rotated binary Y component.
Claim 7
Dependent Claim
40 words
The method of claim 4 further comprising, after said modifying step: addressing a memory means with the rotated binary X and binary Y components, said memory containing the ideal rotated binary X and binary Y components of the rotated symbol.
Claim 8
Independent Claim
174 words
A method for detecting the occurrence of phase-jumps in a phase modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, said method comprising: comparing the binary X and binary Y components of the received symbol with the ideal binary X and binary Y components of that symbol; generating an error X and error Y indication that represents the difference between the received and the ideal binary X and binary Y components; generating a rotated binary X and binary Y component that represents the received symbol rotated N degrees; comparing the binary X and binary Y component of the rotated symbol with the ideal binary X and binary Y components of the rotated symbol; generating a rotated error X and rotated error Y indication that represents the difference between the received rotated and the ideal rotated binary X and binary Y components; and comparing the magnitude of the error X and error Y indication with the magnitude of the rotated error X and rotated error Y indication.
Claim 9
Independent Claim
174 words
A method for detecting the occurrence of phase-jumps in a phase modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, said method comprising: comparing the binary X and binary Y components of the received symbol with the ideal binary X and binary Y components of that symbol; generating an error X and error Y indication that represents the difference between the received and the ideal binary X and binary Y components; generating a rotated binary X and binary Y component that represents the received symbol rotated N degrees; comparing the binary X and binary Y component of the rotated symbol with the ideal binary X and binary Y components of the rotated symbol; generating a rotated error X and rotated error Y indication that represents the difference between the received rotated and the ideal rotated binary X and binary Y components; and comparing the magnitude of the error X and error Y indication with the magnitude of the rotated error X and rotated error Y indication.
Claim 10
Dependent Claim
41 words
The method of claim 7 wherein said comparing step comprises: addressing a memory means with the binary X and binary Y components of the received symbol, said memory containing the ideal binary X and binary Y components of the received symbol.
Claim 11
Dependent Claim
54 words
The method of claim 8 wherein said error X and error Y generating step includes: receiving the binary X and binary Y component of the received symbol; subtracting the ideal binary X component and binary Y component of the received symbol from the received binary X and binary Y component; and storing the result.
Claim 12
Dependent Claim
59 words
The method of claim 9 wherein said rotated binary X and binary Y generating step, includes: multiplying the received binary X component minus the received binary Y component by 0.707 to obtain the rotated binary X component; and multiplying the received binary X component plus the received binary Y component by 0.707 to obtain the rotated binary Y component.
Claim 13
Dependent Claim
39 words
The method of claim 10 wherein said comparing step, includes: addressing a memory means with the rotated binary X and binary Y components, said memory containing the ideal rotated binary X and binary Y components of the rotated symbol.
Claim 14
Dependent Claim
40 words
The method of claim 11 wherein said rotated error X and rotated error Y generating step, includes: subtracting the ideal rotated binary X and binary Y components of the rotated symbol from the rotated binary X and binary Y components.
Claim 15
Dependent Claim
61 words
The method of claim 12 wherein said magnitude comparing step, includes: adding the error X and error Y indications to obtain a composite unrotated error indication; adding the rotated error X and error Y indications to obtain a composite rotated error indication; and comparing the magnitude of the composite unrotated error indication with the magnitude of the composite rotated error indication.
Claim 16
Dependent Claim
61 words
The method of claim 7 wherein said magnitude comparing step, includes: adding the error X and error Y indications to obtain a composite unrotated error indication; adding the rotated error X and error Y indication to obtain a composite rotated error indication; and comparing the magnitude of the composite unrotated error indication with the mgnitude of the composite rotated error indication.
Claim 17
Independent Claim
92 words
A method for producing a signal quality indication in a phase-modulated voice-band communication system wherein received symbols are converted into binary X and binary Y components, said method comprising: comparing the binary X and binary Y components of the received symbol with the ideal binary X and binary Y components of that symbol; generating an error X and error Y indication that represents the difference between the received and the ideal binary X and binary Y components; and combining the error X and error Y indications to produce a signal quality indication.
Claim 18
Independent Claim
92 words
A method for producing a signal quality indication in a phase-modulated voice-band communication system wherein received symbols are converted into binary X and binary Y components, said method comprising: comparing the binary X and binary Y components of the received symbol with the ideal binary X and binary Y components of that symbol; generating an error X and error Y indication that represents the difference between the received and the ideal binary X and binary Y components; and combining the error X and error Y indications to produce a signal quality indication.
Claim 19
Dependent Claim
41 words
The method of claim 15 wherein said comparing step comprises: addressing a memory means with the binary X and binary Y components of the received symbol, said memory containing the ideal binary X and binary Y components of the received symbol.
Claim 20
Dependent Claim
51 words
The method of claim 16 wherein said error X and error Y generating step includes: receiving the binary X and binary Y components of the received symbol; and subtracting the ideal binary X component and binary Y component of the received symbol from the received binary X and binary Y components.
Claim 21
Dependent Claim
135 words
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for detecting the occurrence of phase-jumps therein comprising: means for generating an error X and error Y indication that represents the difference between the binary X and binary Y components of a received symbol and the ideal binary X and binary Y components of that symbol; means for generating a rotated error X and rotated error Y indication that represents the difference between the binary X and binary Y components of the received symbol rotated by N degrees and the ideal binary X and binary Y components of the rotated symbol; and means for comparing the magnitude of the error X and error Y indication with the rotated error X and rotated error Y indication.
Claim 22
Dependent Claim
135 words
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for detecting the occurrence of phase-jumps therein comprising: means for generating an error X and error Y indication that represents the difference between the binary X and binary Y components of a received symbol and the ideal binary X and binary Y components of that symbol; means for generating a rotated error X and rotated error Y indication that represents the difference between the binary X and binary Y components of the received symbol rotated by N degrees and the ideal binary X and binary Y components of the rotated symbol; and means for comparing the magnitude of the error X and error Y indication with the rotated error X and rotated error Y indication.
Claim 23
Dependent Claim
40 words
The apparatus of claim 18 wherein said error X and error Y generating means, comprises: means for subtracting the ideal binary X component and binary Y component of the received symbol from the received binary X and binary Y component.
Claim 24
Dependent Claim
38 words
The apparatus of claim 19, further comprising: memory means addressable with the binary X and binary Y components of the received symbol, said memory means containing the ideal binary X and binary Y components of the received symbol.
Claim 25
Dependent Claim
59 words
The apparatus of claim 18 wherein said rotated error X and rotated error Y generating means, comprises: means for modifying the received binary X and binary Y components to represent the received symbol rotated by N degrees; and means for subtracting the ideal rotated binary X and binary Y components from the modified binary X and binary Y components.
Claim 26
Dependent Claim
57 words
The apparatus of claim 21 wherein said modifying means comprises: means for multiplying the received binary X component minus the received binary Y component by 0.707 to obtain the rotated binary X component; and means for multiplying the received binary X component plus the received binary Y component by 0.707 to obtain the rotated binary Y component.
Claim 27
Dependent Claim
35 words
The apparatus of claim 21 further comprising: memory means addressable with the binary X and binary Y components, said memory means containing the ideal rotated binary X and binary Y components of the rotated symbol.
Claim 28
Dependent Claim
69 words
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for producing a signal quality indication, comprising: means for generating an error X and error Y indication that represents the difference between the received and ideal binary X and binary Y components; and means for combining the error X and error Y indication to produce a signal quality indication.
Claim 29
Dependent Claim
69 words
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for producing a signal quality indication, comprising: means for generating an error X and error Y indication that represents the difference between the received and ideal binary X and binary Y components; and means for combining the error X and error Y indication to produce a signal quality indication.
Claim 30
Dependent Claim
38 words
The apparatus of claim 24 further comprising: memory means addressable by the binary X and binary Y components of the received symbol, said memory means containing the ideal binary X and binary Y components of the received symbol.
Claim 31
Dependent Claim
40 words
The apparatus of claim 24 wherein said error X and error Y generating means, comprising: means for subtracting the ideal binary X component and binary Y component of the received symbol from the received binary X and binary Y component.
Claim 32
Dependent Claim
44 words
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for compensating for phase-jumps in the communication system, comprising: means for detecting the occurrence of a phase-jump; and means for correcting for the phase-jump.
Claim 33
Dependent Claim
44 words
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for compensating for phase-jumps in the communication system, comprising: means for detecting the occurrence of a phase-jump; and means for correcting for the phase-jump.
Claim 34
Dependent Claim
59 words
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for compensating for N degree phase-jumps in the communication line, comprising: means for detecting the occurrence of an N degree phase-jump; and means for modifying the binary X and binary Y components of the received symbols by N degrees.
Claim 35
Dependent Claim
59 words
In a phase-modulated voice-band communication system wherein received phase symbols are converted into binary X and binary Y components, apparatus for compensating for N degree phase-jumps in the communication line, comprising: means for detecting the occurrence of an N degree phase-jump; and means for modifying the binary X and binary Y components of the received symbols by N degrees.
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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |