Patent US3614673A successfully refreshed from Google Patents.
US3614673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique for utilizing a single pulse to set the gains of a transversal filter
Assignee: Bunker Ramo Corp
•
Filing: 1970-05-28
•
Granted: 1971-10-19
•
Expires: 1990-05-28
Abstract
Abstract A system for utilizing a single pulse having initially known characteristics to set the tap weights of a transversal filter to convert a first time function applied to the filter input into a second time function at the filter output. The pulse as it appears at the system input is converted into a first representation in the frequency domain and is mathematically operated upon, in conjunction with a generated second representation in the frequency domain of the pulse as it is desired that it appear at the output from the filter, to generate the frequency domain transfer function of the transversal filter. This transfer function is then converted into the time domain inpulse response of the filter which may be directly utilized to form the desired set of weighting factors for the transversal filter. When the first time function is a signal received over a transmission media, the system may function as a media equalizer.
Inventors
- 👤 George Su Kang
- 👤 Robert Lewis Goodwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:27
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03159; H04L2025/03433; H04L2025/03439; H04L2025/03522
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
130 words
A system for utilizing a single pulse having initially known characteristics to set the tape weights of a transversal filter to convert a first time function applied to the filter input into a second time function at the filter output comprising; means for generating a first representation in the frequency domain of said pulse, in the form in which it is applied to the system; means for generating a second representation in the frequency domain of said pulse as it is desired that it appear at the output from said filter; means responsive to said first and second representations for generating the transfer function of said transversal filter; and means for converting said transfer function into the transversal filter impulse response which is utilized to set said transversal filter weights.
Claim 2
Independent Claim
130 words
A system for utilizing a single pulse having initially known characteristics to set the tape weights of a transversal filter to convert a first time function applied to the filter input into a second time function at the filter output comprising; means for generating a first representation in the frequency domain of said pulse, in the form in which it is applied to the system; means for generating a second representation in the frequency domain of said pulse as it is desired that it appear at the output from said filter; means responsive to said first and second representations for generating the transfer function of said transversal filter; and means for converting said transfer function into the transversal filter impulse response which is utilized to set said transversal filter weights.
Claim 3
Dependent Claim
50 words
A system of the type described in claim 1 wherein said first representation is the frequency spectrum of said pulse as it appears in said first time function; and wherein said second representation is the frequency spectrum of said pulse as it appears when converted into said second time function.
Claim 4
Dependent Claim
38 words
A system of the type described in claim 2 wherein said means for generating said first representation is a Fourier transform circuit and wherein said transfer function to impulse response transform means is an inverse Fourier transform circuit.
Claim 5
Dependent Claim
20 words
A system of the type described in claim 3 wherein said Fourier transform circuit is a single pulse spectrum analyzer.
Claim 6
Dependent Claim
39 words
A system of the type described in claim 3 including means for storing the coefficients of the output from said inverse Fourier transform circuit; and means for applying said stored coefficients to control the weights of said transversal filter.
Claim 7
Dependent Claim
48 words
A system of the type described in claim 3 wherein said first representation has a real part A and an imaginary part B; wherein said second representation has a real part C and an imaginary part D; and wherein said transversal filter transfer function (H) is equal to
Claim 8
Dependent Claim
40 words
A system of the type described in claim 1 wherein said transfer function has poles on both sides of the complex plane; and wherein the conversion to said impulse response is effectively carried out both for t 0 and t<0.
Claim 9
Dependent Claim
26 words
A system of the type described in claim 1 wherein said transfer function generating means includes means for mathematically operating on said first and second representations.
Claim 10
Dependent Claim
17 words
A system of the type described in claim 1 wherein said single pulse is a test pulse.
Claim 11
Dependent Claim
41 words
A system of the type described in claim 1 wherein said first time function and said single pulse are signals received over a distortion introducing media; and wherein said second time function is an equalized form of said first time function.
Claim 12
Dependent Claim
29 words
A system of the type described in claim 1 wherein said second representation is the frequency spectrum of said single pulse as it appears when applied to said media.
Claim 13
Independent Claim
126 words
A system for equalizing a signal received over a transmission media comprising: a transversal filter; means for normally applying said received signal to said transversal filter; means operative when a test pulse is received over said transmission media for converting said test pulse into a first representation of said received pulse in the frequency domain; means for generating a second representation in the frequency domain of said test pulse as it appeared when applied to said transmission media; means responsive to said representations for generating the transfer function of said transversal filter; means for converting said transfer function into the transversal filter impulse response; and means for utilizing said impulse response to set the tap gains of said transversal filter to equalize receive signals applied thereto.
Claim 14
Independent Claim
126 words
A system for equalizing a signal received over a transmission media comprising: a transversal filter; means for normally applying said received signal to said transversal filter; means operative when a test pulse is received over said transmission media for converting said test pulse into a first representation of said received pulse in the frequency domain; means for generating a second representation in the frequency domain of said test pulse as it appeared when applied to said transmission media; means responsive to said representations for generating the transfer function of said transversal filter; means for converting said transfer function into the transversal filter impulse response; and means for utilizing said impulse response to set the tap gains of said transversal filter to equalize receive signals applied thereto.
Claim 15
Dependent Claim
20 words
A system of the type described in claim 12 wherein said representations are the frequency spectrums of the respective pulses.
Claim 16
Dependent Claim
38 words
A system of the type described in claim 13 wherein said means for generating said first representation is a Fourier transform circuit and wherein said transfer function to impulse response transform means is an inverse Fourier transform circuit.
Claim 17
Dependent Claim
20 words
A system of the type described in claim 14 wherein said Fourier transForm circuit is a single pulse spectrum analyzer.
Claim 18
Dependent Claim
39 words
A system of the type described in claim 14 including means for storing the coefficients of the output from said inverse Fourier transform circuit; and means for applying said stored coefficients to control the weights of said transversal filter.
Claim 19
Dependent Claim
47 words
A system of the type described in claim 13 wherein said first representation has a real part A and imaginary part B; wherein said second representation has a real part C and an imaginary part D; and wherein said transversal filter transfer function (H) is equal to
Claim 20
Independent Claim
129 words
A method of utilizing a single pulse having initially known characteristics to set the tap gains of a transversal filter to convert a first time function applied to the filter input into a second time function at the filter output comprising the steps of: converting said pulse as it is applied to the system into a first representation in the frequency domain; generating a second representation in the frequency domain, said second representation being a frequency domain representation of said pulse as it is desired that it appear at the output from the filter; generating from said first and second representations the transfer function of said transversal filter; converting said transfer function into the transversal filter impulse response; and applying said impulse response to se said transversal filter gains.
Claim 21
Independent Claim
129 words
A method of utilizing a single pulse having initially known characteristics to set the tap gains of a transversal filter to convert a first time function applied to the filter input into a second time function at the filter output comprising the steps of: converting said pulse as it is applied to the system into a first representation in the frequency domain; generating a second representation in the frequency domain, said second representation being a frequency domain representation of said pulse as it is desired that it appear at the output from the filter; generating from said first and second representations the transfer function of said transversal filter; converting said transfer function into the transversal filter impulse response; and applying said impulse response to se said transversal filter gains.
Claim 22
Dependent Claim
50 words
A method of the type described in claim 18 wherein said first representation is the frequency spectrum of said pulse as it appears in said first time function; and wherein said second representation is the frequency spectrum of said pulse as it appears when converted into said second time function.
Claim 23
Dependent Claim
48 words
A method of the type described in claim 19 wherein said first representation has a real part A and an imaginary part B; wherein said second representation has a real part C and an imaginary part D; and wherein said transversal filter transfer function (H) is equal to
Claim 24
Independent Claim
118 words
A method of setting the tap weights of a transversal filter so that the filter will equalize a signal received over a transmission media which is applied thereto comprising the steps of: applying a test pulse having known characteristics through said transmission media; converting the received test pulse into first representation in the frequency domain; generating a second representation in the frequency domain which is a representation in the frequency domain of said test pulse as it appeared when applied to said transmission media; generating from said first and second representations the transfer function of said transversal filter; converting said transfer function into said transversal filter impulse response; and applying said impulse response to set said tap weights.
Claim 25
Independent Claim
118 words
A method of setting the tap weights of a transversal filter so that the filter will equalize a signal received over a transmission media which is applied thereto comprising the steps of: applying a test pulse having known characteristics through said transmission media; converting the received test pulse into first representation in the frequency domain; generating a second representation in the frequency domain which is a representation in the frequency domain of said test pulse as it appeared when applied to said transmission media; generating from said first and second representations the transfer function of said transversal filter; converting said transfer function into said transversal filter impulse response; and applying said impulse response to set said tap weights.
Claim 26
Dependent Claim
50 words
A method of the type described in claim 21 wherein said first representation is the frequency spectrum of said pulse as it appears in said first time function; and wherein said second representation is the frequency spectrum of said pulse as it appears when converted into said second time function.
Claim 27
Dependent Claim
48 words
A method of the type described in claim 22 wherein said first representation has a real part A and an imaginary part B; wherein said second representation has a real part C and an imaginary part D; and wherein said transversal filter transfer function (H) is equal to
References Cited (Backward Citations)
US3289108A
Cited
US3375473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |