US5559830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Equalization system for AM compatible digital receiver
Assignee: Ibiquity Digital Corp
•
Filing: 1995-01-23
•
Granted: 1996-09-24
•
Expires: 2015-01-23
Abstract
Abstract An equalizer is provided for enhancing the recoverability of digital audio broadcasting signal information. The equalizer receives the AM compatible digital audio broadcasting waveform and stores that waveform as a waveform vector. The equalizer then processes that waveform by multiplying the waveform vector by an equalization vector. This equalization vector comprises a plurality of equalizer coefficients, each of the coefficients initially set to a predetermined value. The equalizer then compares each location of the processed waveform vector with a stored waveform vector. The equalizer selects as the signal that vector location closest to the stored waveform vector. Preferably, the equalizer includes means for updating the equalizer coefficients using the waveform vector, the processed waveform vector, and the stored waveform vector to provide immunity to noise.
Inventors
- 👤 Mark J. Dapper
- 👤 Michael J. Geile
- 👤 Barry W. Carlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:45
CPC Classifications
H; H04; H04H; H04H40/00; H04H40/18; H04H40/27; H04H2201/00; H04H2201/10; H04H2201/18; H04H2201/186
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
127 words
An equalizer for producing an output signal in a receiver provided in an amplitude modulated compatible digital broadcasting system comprising: a. means for receiving an amplitude modulated compatible digital broadcasting waveform and storing said waveform as a waveform vector in the frequency domain; b. means for processing said waveform by multiplying said waveform vector by an equalization vector, said equalization vector comprising a plurality of equalizer coefficients, said equalizer coefficients initially set to a predetermined value; c. means for comparing each location of said processed waveform vector with a stored waveform vector and selecting as the signal that vector location closest to said stored waveform vector; and d. means for updating said equalizer coefficients using said waveform vector, said processed waveform vector and said stored waveform vector.
Claim 2
Dependent Claim
127 words
An equalizer for producing an output signal in a receiver provided in an amplitude modulated compatible digital broadcasting system comprising: a. means for receiving an amplitude modulated compatible digital broadcasting waveform and storing said waveform as a waveform vector in the frequency domain; b. means for processing said waveform by multiplying said waveform vector by an equalization vector, said equalization vector comprising a plurality of equalizer coefficients, said equalizer coefficients initially set to a predetermined value; c. means for comparing each location of said processed waveform vector with a stored waveform vector and selecting as the signal that vector location closest to said stored waveform vector; and d. means for updating said equalizer coefficients using said waveform vector, said processed waveform vector and said stored waveform vector.
Claim 3
Dependent Claim
17 words
The equalizer of claim 1 wherein said means for updating said equalizer coefficients modifies said coefficients individually.
Claim 4
Independent Claim
114 words
A method for equalizing an amplitude modulated compatible digital broadcasting waveform comprising the steps of a. receiving an amplitude modulated compatible digital broadcasting waveform and storing said waveform as a waveform vector in the frequency domain; b. processing said waveform by multiplying said waveform vector by an equalization vector, said equalization vector comprising a plurality of equalizer coefficients, said equalizer coefficients initially set to a predetermined value; c. comparing each location of said processed waveform vector with a stored waveform vector and selecting as the signal that vector location closest to said stored waveform vector; and d. updating said equalizer coefficients using said waveform vector, said processed waveform vector and said stored waveform vector.
Claim 5
Independent Claim
114 words
A method for equalizing an amplitude modulated compatible digital broadcasting waveform comprising the steps of a. receiving an amplitude modulated compatible digital broadcasting waveform and storing said waveform as a waveform vector in the frequency domain; b. processing said waveform by multiplying said waveform vector by an equalization vector, said equalization vector comprising a plurality of equalizer coefficients, said equalizer coefficients initially set to a predetermined value; c. comparing each location of said processed waveform vector with a stored waveform vector and selecting as the signal that vector location closest to said stored waveform vector; and d. updating said equalizer coefficients using said waveform vector, said processed waveform vector and said stored waveform vector.
Claim 6
Dependent Claim
12 words
The method of claim 3 wherein said equalizer coefficients are modified individually.
References Cited (Backward Citations)
US4550415A
Cited
US4843583A
Cited
US4847797A
Cited
US5175747A
Cited
US5113142A
Cited
US5214671A
Cited
US5243624A
Cited
US5268930A
Cited
US5448590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-24 | 2000-03-25 | 2000-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-24 | 2004-03-25 | 2004-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-24 | 2008-03-25 | 2008-09-24 | $7700.00 | Window Closed / Lapsed |