Patent US5305351A successfully refreshed from Google Patents.
US5305351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive equalizer which carries out an equalization operation with reference to a magnitude of fading
Assignee: NEC Corp
•
Filing: 1992-02-12
•
Granted: 1994-04-19
•
Expires: 2012-02-12
Abstract
Abstract For use in combination with a demodulator (23) for demodulating a received signal susceptible to fading into a demodulated signal, an adaptive equalizer comprises a fading detecting circuit (51) for detecting the received signal to produce a detection signal representative of a magnitude of the fading. Into a processed signal and supplied with the detection signal, an equalizer multiplier (53) processes an equalized signal produced in an equalizer section (25, 26 and 27) which is for carrying out a predetermined equalization operation. In accordance with the processed signal, an automatic gain control circuit (52) modifies the demodulated signal into a modified signal on which the predetermined equalization operation is carried out.
Inventors
- 👤 Shoichi Mizoguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:46
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/005; G; G05; G05B; G05B2219/00; G05B2219/20; G05B2219/23; G05B2219/23307; G05B2219/23339
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
208 words
An adaptive equalizer for use in combination with a demodulator for producing a demodulated signal responsive to a received signal which is susceptible to fading, said adaptive equalizer including modifying means for modifying said demodulated signal into a modified signal in accordance with a control signal, an equalizer section for carrying out a predetermined equalization operation on said modified signal to produce an equalized signal representative of a result of said predetermined equalization operation, detecting means for detecting said received signal to produce a detection signal representative of a magnitude of said fading; processing means connected to said equalizer section and said detecting means for processing said equalized signal into a processed signal in accordance with said detection signal; and supplying means connected to said modifying and said processing means for supplying said processed signal as said control signal to said modifying means, said processing means comprising: coefficient-determining means connected to said detecting means for determining a multiplication coefficient in accordance with said detection signal; and multiplying means connected to said equalizer section and said coefficient determining means for carrying out a multiplication operation between said equalized signal and said multiplication coefficient to produce, as said processed signal, a signal representative of a result of said multiplication operation.
Claim 2
Dependent Claim
208 words
An adaptive equalizer for use in combination with a demodulator for producing a demodulated signal responsive to a received signal which is susceptible to fading, said adaptive equalizer including modifying means for modifying said demodulated signal into a modified signal in accordance with a control signal, an equalizer section for carrying out a predetermined equalization operation on said modified signal to produce an equalized signal representative of a result of said predetermined equalization operation, detecting means for detecting said received signal to produce a detection signal representative of a magnitude of said fading; processing means connected to said equalizer section and said detecting means for processing said equalized signal into a processed signal in accordance with said detection signal; and supplying means connected to said modifying and said processing means for supplying said processed signal as said control signal to said modifying means, said processing means comprising: coefficient-determining means connected to said detecting means for determining a multiplication coefficient in accordance with said detection signal; and multiplying means connected to said equalizer section and said coefficient determining means for carrying out a multiplication operation between said equalized signal and said multiplication coefficient to produce, as said processed signal, a signal representative of a result of said multiplication operation.
Claim 3
Dependent Claim
55 words
An adaptive equalizer as claimed in claim 1, wherein said modifying means comprises: gain-determining means connected to said multiplying means for determining a gain in accordance with said control signal; and control means connected to said gain-determining means and said equalizer section for controlling a level of said demodulated signal in accordance with said gain.
Claim 4
Dependent Claim
82 words
An adaptive equalizer as claimed in claim 1, wherein said received signal has a plurality of frequency components, said detecting means further comprising: selecting means for selecting said frequency components from said received signal; level-detecting means connected to said selecting means for detecting said frequency components to produce a level signal representative of levels of said frequency components; and producing means connected to said level detecting and said mentioned processing means for producing said detection signal in accordance with said level signal.
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) | 1997-04-18 | 1997-10-18 | 1998-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-18 | 2001-10-18 | 2002-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-18 | 2005-10-18 | 2006-04-19 | $7700.00 | Window Closed / Lapsed |