Patent US3723911A successfully refreshed from Google Patents.
US3723911A
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US
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Training adaptive linear filters
Assignee: Motorola Solutions Inc
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Filing: 1971-09-13
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Granted: 1973-03-27
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Expires: 1991-09-13
Abstract
Abstract Adaptive linear transversal filter is trained with a periodic training sequence having period exactly equal to the number of variable parameters of the filter to be set in the training mode. After training, tap coefficients may be cycled in a closed loop to a preferred position.
Inventors
- 👤 G Forney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:55
CPC Classifications
H; H03; H03H; H03H21/00; H03H21/0012; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03114; H04L25/03133
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
In a system including an adaptive transversal filter having a serial memory through which passes a succession of signals representing real or complex numbers, the output of said filter being the sum of the pairwise products of the signals in said filter with a set of adjustable tap coefficients, N said tap coefficients being adjustable during a training mode upon receipt of a training sequence of signals at the rate of 1/T signals/second, the adjustment being in accordance with a sequence of error values, said error values being equal to the difference between said outputs and a desiRed output sequence; that improvement comprising means for causing said training sequence and said desired output sequence both to be periodic with period N signalling intervals T.
Claim 2
Dependent Claim
124 words
In a system including an adaptive transversal filter having a serial memory through which passes a succession of signals representing real or complex numbers, the output of said filter being the sum of the pairwise products of the signals in said filter with a set of adjustable tap coefficients, N said tap coefficients being adjustable during a training mode upon receipt of a training sequence of signals at the rate of 1/T signals/second, the adjustment being in accordance with a sequence of error values, said error values being equal to the difference between said outputs and a desiRed output sequence; that improvement comprising means for causing said training sequence and said desired output sequence both to be periodic with period N signalling intervals T.
Claim 3
Dependent Claim
23 words
The improvement of claim 1 further comprising means for cycling said tap coefficients to a preferred position after adjustment during said training mode.
Claim 4
Dependent Claim
28 words
The improvement of claim 2 wherein said means for cycling said coefficients is adapted to position the largest coefficient in the middle of the sequence of said coefficients.
Claim 5
Dependent Claim
123 words
In a method of training an adaptive transversal filter having a serial memory through which passes a succession of signals representing real or complex numbers, the output of said filter being the sum of the pairwise products of the signals in said filter with a set of adjustable tap coefficients, N said tap coefficients being adjustable during a training mode upon receipt of a training sequence of signals at the rate of 1/T signals/second, the adjustment being in accordance with a sequence of error values, said error values being equal to the difference between said outputs and a desired output sequence; that improvement comprising causing said training sequence and said desired output sequence both to be periodic with period N signalling intervals T.
Claim 6
Dependent Claim
123 words
In a method of training an adaptive transversal filter having a serial memory through which passes a succession of signals representing real or complex numbers, the output of said filter being the sum of the pairwise products of the signals in said filter with a set of adjustable tap coefficients, N said tap coefficients being adjustable during a training mode upon receipt of a training sequence of signals at the rate of 1/T signals/second, the adjustment being in accordance with a sequence of error values, said error values being equal to the difference between said outputs and a desired output sequence; that improvement comprising causing said training sequence and said desired output sequence both to be periodic with period N signalling intervals T.
Claim 7
Dependent Claim
21 words
The improvement of claim 4 further comprising cycling said tap coefficients to a preferred position after adjustment during said training mode.
References Cited (Backward Citations)
US3283063A
Cited
US3375473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |