Patent US4772872A successfully refreshed from Google Patents.
US4772872A
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Alignment system for encoders
Assignee: Raytheon Co
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Filing: 1986-12-12
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Granted: 1988-09-20
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Expires: 2006-12-12
Abstract
Abstract An improved encoder alignment system is disclosed which provides an indication of the extent of misalignment and a measure of the rate at which the misalignment may be changing. The invention is adapted for use with a conventional encoder which provides a digital coarse word having at least significant bit and a digital fine word having a least significant bit and a most significant bit. The invention generates the exclusive or of the least significant bit of the coarse digital signal and the least significant bit of the fine digital signal to provide a first signal. The invention then generates the exclusive or of the first signal and the complement of the most significant bit of the fine digital signal to provide an output signal which represents the misalignment of the encoder.
Inventors
- 👤 Daniel D. Villani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:08
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/10; H03M1/1066; H03M1/12; H03M1/14; H03M1/143
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
An improved alignment system for an encoder having means for generating a coarse digital signal having a least significant bit and means for generating a fine digital signal having a most significant bit and a least significant bit with the two generating means being aligned such that the 1-to-0 state transition of the least significant bit of the coarse digital signal occurs when the most significant bit of the fine digital signal is in the 0 state, the system comprising: first means for providing an exclusive or operation on the least significant bit of the coarse digital signal and the least significant bit of the fine digital signal to provide a first signal; and second means for providing an exlusive or operation on the first signal and the complement of the most significant bit of the fine digital signal to provide an output signal which represents misalignment of said encoder.
Claim 2
Dependent Claim
150 words
An improved alignment system for an encoder having means for generating a coarse digital signal having a least significant bit and means for generating a fine digital signal having a most significant bit and a least significant bit with the two generating means being aligned such that the 1-to-0 state transition of the least significant bit of the coarse digital signal occurs when the most significant bit of the fine digital signal is in the 0 state, the system comprising: first means for providing an exclusive or operation on the least significant bit of the coarse digital signal and the least significant bit of the fine digital signal to provide a first signal; and second means for providing an exlusive or operation on the first signal and the complement of the most significant bit of the fine digital signal to provide an output signal which represents misalignment of said encoder.
Claim 3
Dependent Claim
21 words
The improved alignment system of claim 1 wherein said first means and said second means are provided by a logic circuit.
Claim 4
Dependent Claim
33 words
The improved alignment system of claim 2 wherein said logic circuit provides a digital output signal having a train of pulses with the width of each pulse representing the misalignment of said encoder.
Claim 5
Dependent Claim
22 words
The improved alignment system of claim 3 including a counter for measuring the width of the output pulses to provide output data.
Claim 6
Dependent Claim
23 words
The improved alignment system of claim 4 including means for storing the output data at addresses corresponding the instantaneous position of said encoder.
Claim 7
Dependent Claim
17 words
The improved alignment system of claim 5 including data processing means for operating on stored output data.
Claim 8
Dependent Claim
156 words
An improved alignment system for a device having means for generating a coarse digital signal having a least significant bit and means for generating a fine digital signal having a most significant bit and a least significant bit with the two generating means being aligned such that the 1-to-0 state transition of the least significant bit of the coarse digital signal occurs when the most significant bit of the fine digital signal is in the 0 state, the system comprising: first means for providing an exclusive or operation on the least significant bit of the coarse digital signal and the least significant bit of the fine digital signal to provide a first signal; second means for providing an exclusive or operation on the first signal and the complement of the most significant bit of the fine digital signal to provide an output signal which represents misalignment of said device; and means for processing the output signal.
Claim 9
Dependent Claim
156 words
An improved alignment system for a device having means for generating a coarse digital signal having a least significant bit and means for generating a fine digital signal having a most significant bit and a least significant bit with the two generating means being aligned such that the 1-to-0 state transition of the least significant bit of the coarse digital signal occurs when the most significant bit of the fine digital signal is in the 0 state, the system comprising: first means for providing an exclusive or operation on the least significant bit of the coarse digital signal and the least significant bit of the fine digital signal to provide a first signal; second means for providing an exclusive or operation on the first signal and the complement of the most significant bit of the fine digital signal to provide an output signal which represents misalignment of said device; and means for processing the output signal.
Claim 10
Dependent Claim
152 words
An improved method for aligning a device having means for generating a coarse digital signal having a least significant bit and means for generating afine digiral signal having a most significant bit and a least significant bit with the two generating means being aligned such that the 1-to-0 state transition of the least significant bit of the coarse digital signal occurs when the most significant bit of the fine digital signal is in the 0 state, the method including the steps of: (a) operating on the least significant bit of the coarse digital signal and the least significant bit of the fine digital signal to provide a first signal which is the exclusive or thereof; and (b) operating on the first signal and the complement of the most significant bit of the fine digital signal to provide an output signal which is the exclusive or thereof and represents misalignment of said device.
Claim 11
Dependent Claim
152 words
An improved method for aligning a device having means for generating a coarse digital signal having a least significant bit and means for generating afine digiral signal having a most significant bit and a least significant bit with the two generating means being aligned such that the 1-to-0 state transition of the least significant bit of the coarse digital signal occurs when the most significant bit of the fine digital signal is in the 0 state, the method including the steps of: (a) operating on the least significant bit of the coarse digital signal and the least significant bit of the fine digital signal to provide a first signal which is the exclusive or thereof; and (b) operating on the first signal and the complement of the most significant bit of the fine digital signal to provide an output signal which is the exclusive or thereof and represents misalignment of said device.
References Cited (Backward Citations)
US4383317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |