US4603408A
Expired / Lapsed
US
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Synthesis of arbitrary broadband signals for a parametric array
Assignee: United States Department of the Navy
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Filing: 1983-07-21
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Granted: 1986-07-29
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Expires: 2003-07-21
Abstract
Abstract A method for synthesizing arbitrary broadband signals for a parametric ar which computes the input waveform needed to a parametric array source to obtain a received signal of a prescribed waveform. The method uses Fourier transform and the inverse transform of digitized received signal in order to make computation in either the frequency domain or the time domain depending upon the computational simplicity in a particular domain. The method uses a iterative process to obtain the received signal very close to the received signal of the desired waveform.
Inventors
- 👤 Sharad Singhal
- 👤 John G. Zornig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:55
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/34; G10K11/341; G10K11/343; G01; G01N; G01N2291/00; G01N2291/02; G01N2291/024; G01N2291/02491
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
A method involving non-linear input-output frequency and amplitude relationships for synthesizing broadband signals similar to a given low frequency signal for a parametric array involving using a general purpose digital computer, a display means, a projector, a hydrophone, an A/D converter, a D/A converter, low pass transmit and receive filters, amplifiers and means for generating high frequencies acting as primaries and forming a difference frequency secondary when traveling through a nonlinear medium, said method includes the steps of: generating a first value of a function proportional to an integral representing the difference frequency secondary; obtaining a first value of a computed received signal using said function; using the first value of the computed received signal to obtain a second value of said function; obtaining a second value of said function; obtaining a third value of the computed received signal from the second value of said function; repeating the above-cited method steps until the computed received signal is similar to the given low frequency signal when displayed on said display means.
Claim 2
Independent Claim
170 words
A method involving non-linear input-output frequency and amplitude relationships for synthesizing broadband signals similar to a given low frequency signal for a parametric array involving using a general purpose digital computer, a display means, a projector, a hydrophone, an A/D converter, a D/A converter, low pass transmit and receive filters, amplifiers and means for generating high frequencies acting as primaries and forming a difference frequency secondary when traveling through a nonlinear medium, said method includes the steps of: generating a first value of a function proportional to an integral representing the difference frequency secondary; obtaining a first value of a computed received signal using said function; using the first value of the computed received signal to obtain a second value of said function; obtaining a second value of said function; obtaining a third value of the computed received signal from the second value of said function; repeating the above-cited method steps until the computed received signal is similar to the given low frequency signal when displayed on said display means.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the step of obtaining a first value of a computed receive signal includes computing Fourier and inverse Fourier transforms to simplify computations.
Claim 4
Dependent Claim
26 words
The method of claim 2 which further includes the step of filtering high frequency components from transmit and received signals using transmit and receive filters respectively.
Claim 5
Dependent Claim
20 words
The method of claim 3 which further includes the step of amplifying filtered transmit and received signals using said amplifiers.
Claim 6
Independent Claim
127 words
The method of synthesizing broadband, low frequency and directed signals for a parametric array using a general purpose digital computer which includes the steps of: computing a digitized value of a transmit signal from a received signal using said general purpose computer; converting said digitized value of the transmit signal into analog form thereof using a digital to analog converter; transmitting the transmit signal in analog form as a transmitted signal using a projector; receiving said transmitted signal using a hydrophone; converting said received signal from analog to digital form using an analog to digital converter; and computing a new value of transmit signal from the received signal; and repeating the above steps to obtain a received signal similar to the desired waveform for the received signal.
Claim 7
Independent Claim
127 words
The method of synthesizing broadband, low frequency and directed signals for a parametric array using a general purpose digital computer which includes the steps of: computing a digitized value of a transmit signal from a received signal using said general purpose computer; converting said digitized value of the transmit signal into analog form thereof using a digital to analog converter; transmitting the transmit signal in analog form as a transmitted signal using a projector; receiving said transmitted signal using a hydrophone; converting said received signal from analog to digital form using an analog to digital converter; and computing a new value of transmit signal from the received signal; and repeating the above steps to obtain a received signal similar to the desired waveform for the received signal.
Claim 8
Dependent Claim
21 words
The method of claim 5 which further includes the step of filtering high frequency components from the transmit and received signals.
References Cited (Backward Citations)
US3614719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |