US5333149A
Expired / Lapsed
US
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Process and a circuit for adapting coefficients in a modem equalizer
Assignee: STMicroelectronics SA
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Filing: 1992-08-17
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Granted: 1994-07-26
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Expires: 2012-08-17
Abstract
Abstract A process and a circuit for carrying out the process for adapting coefficients in a modem equalizer comprises a memory cell for storing a coefficient, an adapter receiving the output of the cell and providing a first signal having a first correction, and an adder receiving the first signal and providing a second signal to the cell. The adder also receives a value k much smaller than 1 having the sign provided by a comparator comparing an initial value of the considered coefficient and its current value.
Inventors
- 👤 Dominique Vicard
- 👤 William Glass
- 👤 Francois Druilhe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:01
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/01
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
101 words
A method for adapting coefficients in a modem equalizer, comprising the steps of: periodically storing a coefficient value; periodically correcting the stored coefficient value using an error signal associated with detection of at least one symbol provided to the modem to produce a first corrected coefficient value; and periodically correcting the first corrected coefficient value to produce a second corrected coefficient value by adding to the first corrected coefficient value a recall signal comprising a product of an additive constant, much smaller than unity, and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
Claim 2
Independent Claim
101 words
A method for adapting coefficients in a modem equalizer, comprising the steps of: periodically storing a coefficient value; periodically correcting the stored coefficient value using an error signal associated with detection of at least one symbol provided to the modem to produce a first corrected coefficient value; and periodically correcting the first corrected coefficient value to produce a second corrected coefficient value by adding to the first corrected coefficient value a recall signal comprising a product of an additive constant, much smaller than unity, and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
Claim 3
Dependent Claim
21 words
The method of claim 1, further comprising the step of comparing the first corrected coefficient value to the initial coefficient value.
Claim 4
Dependent Claim
27 words
The method of claim 2, further comprising the step of determining the sign of the difference between the first corrected coefficient value and the initial coefficient value.
Claim 5
Dependent Claim
16 words
The method of claim 3, further comprising the step of storing the second corrected coefficient value.
Claim 6
Dependent Claim
16 words
The method of claim 4, further comprising the step of periodically storing the initial coefficient value.
Claim 7
Dependent Claim
28 words
The method of claim 5, further comprising the step of determining the initial coefficient value during a handshake phase of the modem at commencement of a communication operation.
Claim 8
Dependent Claim
19 words
The method of claim 5, further comprising the step of determining the initial coefficient value during a communication operation.
Claim 9
Dependent Claim
128 words
An adapter circuit for adapting coefficients in a modem equalizer, comprising: first means for periodically storing a coefficient value; means, coupled to the first means, for periodically correcting the stored coefficient value including means for processing an error signal associated with detection of at lest one symbol provided to the modem to produce a first corrected coefficient value; and means, coupled to the first means, for periodically correcting the first corrected coefficient value to produce a second corrected coefficient value to be stored in the first means, including means for adding to the first corrected coefficient value, a recall signal comprising a product of an additive constant, much smaller than unity, and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
Claim 10
Dependent Claim
128 words
An adapter circuit for adapting coefficients in a modem equalizer, comprising: first means for periodically storing a coefficient value; means, coupled to the first means, for periodically correcting the stored coefficient value including means for processing an error signal associated with detection of at lest one symbol provided to the modem to produce a first corrected coefficient value; and means, coupled to the first means, for periodically correcting the first corrected coefficient value to produce a second corrected coefficient value to be stored in the first means, including means for adding to the first corrected coefficient value, a recall signal comprising a product of an additive constant, much smaller than unity, and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
Claim 11
Dependent Claim
20 words
The circuit of claim 8, further comprising means for comparing the first corrected coefficient value to the initial coefficient value.
Claim 12
Dependent Claim
26 words
The circuit of claim 9, further comprising means for determining the sign of the difference between the first corrected coefficient value and the initial coefficient value.
Claim 13
Dependent Claim
15 words
The circuit of claim 10, further comprising means for periodically storing the initial coefficient value.
Claim 14
Dependent Claim
27 words
The circuit of claim 11, further comprising means for determining the initial coefficient value during a handshake phase of the modem at commencement of a communication operation.
Claim 15
Dependent Claim
18 words
The circuit of claim 11, further comprising means for determining the initial coefficient value during a communication operation.
Claim 16
Dependent Claim
152 words
A modem including a modem equalizer for adapting coefficients, comprising: a first memory for storing a coefficient; an adapter circuit having a first input coupled to the first memory for receiving the coefficient value stored therein, a second input for receiving a data signal, a third input for receiving an error signal, and an output providing a first corrected coefficient value; and an adder circuit having a first input coupled to the adapter circuit for receiving the first corrected coefficient value, a second input for receiving a recall signal, the recall signal comprising a product of an additive constant, much smaller than unity, and a sign of a difference between the first corrected coefficient value provided by the adapter circuit and an initial coefficient value, and an output, coupled to the first memory, providing a second corrected coefficient value that is the sum of the signals at the first and second inputs.
Claim 17
Dependent Claim
152 words
A modem including a modem equalizer for adapting coefficients, comprising: a first memory for storing a coefficient; an adapter circuit having a first input coupled to the first memory for receiving the coefficient value stored therein, a second input for receiving a data signal, a third input for receiving an error signal, and an output providing a first corrected coefficient value; and an adder circuit having a first input coupled to the adapter circuit for receiving the first corrected coefficient value, a second input for receiving a recall signal, the recall signal comprising a product of an additive constant, much smaller than unity, and a sign of a difference between the first corrected coefficient value provided by the adapter circuit and an initial coefficient value, and an output, coupled to the first memory, providing a second corrected coefficient value that is the sum of the signals at the first and second inputs.
Claim 18
Dependent Claim
16 words
The modem of claim 14, further comprising an additional memory for storing the initial coefficient value.
Claim 19
Dependent Claim
22 words
The modem of claim 15, further comprising means for transferring the initial coefficient value from the additional memory to the first memory.
Claim 20
Dependent Claim
66 words
The modem of claim 16, further comprising a comparator having a first input coupled to the additional memory and a second input coupled to the output of the adapter circuit for comparing the first corrected coefficient value to the initial coefficient value and having an output providing a signal representing the sign of the difference between the first corrected coefficient value and the initial coefficient value.
Claim 21
Dependent Claim
63 words
The modem of claim 17, further comprising a multiplier having a first input coupled to the output of the comparator and a second input receiving the value of a coefficient much smaller than unity, and an output coupled to the second input of the adder, the multiplier multiplying signals at the first and second inputs and providing the recall signal at its output.
Claim 22
Dependent Claim
27 words
The circuit of claim 18, further comprising means for determining the initial coefficient value during a handshake phase of the modem at commencement of a communication operation.
Claim 23
Dependent Claim
18 words
The circuit of claim 18, further comprising means for determining the initial coefficient value during a communication operation.
Claim 24
Independent Claim
97 words
A method for adapting coefficients in a modem equalizer, comprising the steps of: periodically storing a coefficient value; periodically correcting the stored coefficient value using an error signal associated with detection of at least one symbol provided to the modem to produce a first corrected coefficient value; and periodically correcting the first corrected coefficient value to produce a second corrected coefficient value by adding to the first corrected coefficient value a recall signal comprising a product of an additive constant and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
Claim 25
Independent Claim
97 words
A method for adapting coefficients in a modem equalizer, comprising the steps of: periodically storing a coefficient value; periodically correcting the stored coefficient value using an error signal associated with detection of at least one symbol provided to the modem to produce a first corrected coefficient value; and periodically correcting the first corrected coefficient value to produce a second corrected coefficient value by adding to the first corrected coefficient value a recall signal comprising a product of an additive constant and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
Claim 26
Dependent Claim
15 words
The modem of claim 21, wherein the additive constant is a value smaller than unity.
Claim 27
Dependent Claim
16 words
The modem of claim 22, wherein the additive constant is a value much smaller than unity.
Claim 28
Dependent Claim
124 words
An adapter circuit for adapting coefficients in a modem equalizer, comprising: first means for periodically storing a coefficient value; means, coupled to the first means, for periodically correcting the stored coefficient value including means for processing an error signal associated with detection of at least one symbol provided to the modem to produce a first corrected coefficient value; and means, coupled to the first means, for periodically correcting the first corrected coefficient value to produce a second corrected coefficient value to be stored in the first means, including means for adding to the first corrected coefficient value, a recall signal comprising a product of an additive constant and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
Claim 29
Dependent Claim
124 words
An adapter circuit for adapting coefficients in a modem equalizer, comprising: first means for periodically storing a coefficient value; means, coupled to the first means, for periodically correcting the stored coefficient value including means for processing an error signal associated with detection of at least one symbol provided to the modem to produce a first corrected coefficient value; and means, coupled to the first means, for periodically correcting the first corrected coefficient value to produce a second corrected coefficient value to be stored in the first means, including means for adding to the first corrected coefficient value, a recall signal comprising a product of an additive constant and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
Claim 30
Dependent Claim
15 words
The modem of claim 24, wherein the additive constant is a value smaller than unity.
Claim 31
Dependent Claim
16 words
The modem of claim 25, wherein the additive constant is a value much smaller than unity.
Claim 32
Dependent Claim
148 words
A modem including a modem equalizer for adapting coefficients, comprising: a first memory for storing a coefficient; an adapter circuit having a first input coupled to the first memory for receiving the coefficient value stored therein, a second input for receiving a data signal, a third input for receiving an error signal, and an output providing a first corrected coefficient value; and an adder circuit having a first input coupled to the adapter circuit for receiving the first corrected coefficient value, a second input for receiving a recall signal, the recall signal comprising a product of an additive constant, and a sign of a difference between the first corrected coefficient value provided by the adapter circuit and an initial coefficient value, and an output, coupled to the first memory, providing a second corrected coefficient value that is the sum of the signals at the first and second inputs.
Claim 33
Dependent Claim
148 words
A modem including a modem equalizer for adapting coefficients, comprising: a first memory for storing a coefficient; an adapter circuit having a first input coupled to the first memory for receiving the coefficient value stored therein, a second input for receiving a data signal, a third input for receiving an error signal, and an output providing a first corrected coefficient value; and an adder circuit having a first input coupled to the adapter circuit for receiving the first corrected coefficient value, a second input for receiving a recall signal, the recall signal comprising a product of an additive constant, and a sign of a difference between the first corrected coefficient value provided by the adapter circuit and an initial coefficient value, and an output, coupled to the first memory, providing a second corrected coefficient value that is the sum of the signals at the first and second inputs.
Claim 34
Dependent Claim
15 words
The modem of claim 27, wherein the additive constant is a value smaller than unity.
Claim 35
Dependent Claim
16 words
The modem of claim 28, wherein the additive constant is a value much smaller than unity.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-25 | 1998-01-24 | 1998-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-25 | 2002-01-24 | 2002-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-25 | 2006-01-24 | 2006-07-26 | $7700.00 | Window Closed / Lapsed |