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US5208832A
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Methods and apparatus for detecting repetitive sequences
Assignee: Winbond Electronics Corp
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Filing: 1992-05-19
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Granted: 1993-05-04
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Expires: 2012-05-19
Abstract
Abstract The existence of a training sequence in a demodulated signal is detected by first estimating the signal level of the demodulated signal. Next, the error level of the demodulated signal is estimated. The estimated signal level and the estimated error level are then compared against a decision criteria to determine whether a training sequence has been detected.
Inventors
- 👤 Israel Greiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:22
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
A method for detecting a repetitive sequence in a received signal, the method comprising: (a) estimating the signal level of the received signal; (b) estimating the error level of the received signal; and (c) comparing the estimated signal level and the estimated error level against a decision criterion to arrive at a decision regarding the existence of the repetitive sequence.
Claim 2
Independent Claim
60 words
A method for detecting a repetitive sequence in a received signal, the method comprising: (a) estimating the signal level of the received signal; (b) estimating the error level of the received signal; and (c) comparing the estimated signal level and the estimated error level against a decision criterion to arrive at a decision regarding the existence of the repetitive sequence.
Claim 3
Dependent Claim
15 words
A method as in claim 1 wherein the repetitive sequence is a modem training sequence.
Claim 4
Dependent Claim
21 words
A method as in claim 1 wherein the method utilizes a DSP module for detecting the existence of the repetitive sequence.
Claim 5
Dependent Claim
65 words
Apparatus for detecting a repetitive sequence in a received signal, the apparatus comprising: (a) means for estimating the signal level of the received signal; (b) means for estimating the error level of the received signal; and (c) means for comparing the estimated signal level and the estimated error level against a decision criteria to arrive at a decision regarding the existence of the repetitive sequence.
Claim 6
Dependent Claim
65 words
Apparatus for detecting a repetitive sequence in a received signal, the apparatus comprising: (a) means for estimating the signal level of the received signal; (b) means for estimating the error level of the received signal; and (c) means for comparing the estimated signal level and the estimated error level against a decision criteria to arrive at a decision regarding the existence of the repetitive sequence.
Claim 7
Dependent Claim
12 words
Apparatus as in claim 4 wherein the apparatus includes a DSP module.
Claim 8
Dependent Claim
14 words
Apparatus as in claim 4 wherein the repetitive sequence is a modem training sequence.
Claim 9
Dependent Claim
19 words
Apparatus as in claim 6 wherein the repetitive sequence is a training sequence for a V.27 or V.29 modem.
References Cited (Backward Citations)
US4516220A
Cited
US4575864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-03 | 1996-11-02 | 1997-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-03 | 2000-11-02 | 2001-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-03 | 2004-11-02 | 2005-05-04 | $7700.00 | Window Closed / Lapsed |