US3633132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy-weighted dispersive acoustic delay line of the surface wave type
Assignee: Thales SA
•
Filing: 1970-03-05
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Granted: 1972-01-04
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Expires: 1990-03-05
Abstract
Abstract To provide an energy-weighted signal in which the amplitude of the secondary lobes in the signal are essentially suppressed, comb-shaped electrodes having interleaved teeth applied to a piezoelectric wafer equipped with two transducers are dimensioned that at least one of the electrodes has teeth of dissimilar length thus inherently producing weighting of the compressed signal. The tips of the comb-shaped electrodes are arranged in accordance with desired mathematical weighting functions, e.g. a Gauss curve, the Taylor approximation of a Dolph-Tchebychev function, or the Hamming function.
Inventors
- 👤 Pierre Hartemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:08
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/42; H03H9/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A dispersive acoustic delay line of the surface wave type embodying along its transmission path a nonuniform energy distribution described by a weighting function, said delay line comprising: a body (3) of piezoelectric material; two transducers (1, 2) at least one of which includes two combshaped electrodes having interleaved teeth, applied to said body; at least one of the comb-shaped electrodes (2B) having teeth of dissimilar length, the envelope of the tips of the teeth approximating a curve representing said weighting function.
Claim 2
Dependent Claim
82 words
A dispersive acoustic delay line of the surface wave type embodying along its transmission path a nonuniform energy distribution described by a weighting function, said delay line comprising: a body (3) of piezoelectric material; two transducers (1, 2) at least one of which includes two combshaped electrodes having interleaved teeth, applied to said body; at least one of the comb-shaped electrodes (2B) having teeth of dissimilar length, the envelope of the tips of the teeth approximating a curve representing said weighting function.
Claim 3
Dependent Claim
29 words
A delay line as claimed in claim 1, where the body or piezoelectric material (3) is of a material: quartz, or cadmium sulphide, or piezoelectric ceramic, or lithium methaniobate.
Claim 4
Dependent Claim
20 words
A delay line as claimed in claim 1, wherein the transducers (1, 2) include a photoengraved, vacuum, vapor-deposited metal film.
Claim 5
Dependent Claim
28 words
A delay line as claimed in claim 1, wherein one of the comb-shaped electrodes are of the same length, and the other comb-shaped electrodes are of dissimilar length.
Claim 6
Dependent Claim
40 words
A delay line as claimed in claim 1, wherein both comb-shaped electrodes of at least one of the transducers are of dissimilar length, the combination of envelopes of the tips of the teeth of the electrodes forming said weighted function.
Claim 7
Dependent Claim
41 words
A delay line as claimed in claim 1, wherein both comb-shaped electrodes of both transducers are of dissimilar length, the combination of the envelopes of the tips of the teeth of the electrodes of any one transducer forming said weighting function.
Claim 8
Dependent Claim
16 words
A delay line as claimed in claim 1, wherein said weighting function represents a gaussian distribution.
Claim 9
Dependent Claim
20 words
A delay line as claimed in claim 1, wherein said weighting function is a Taylor''s approximation to a DolPh-Tchebychev function.
Claim 10
Dependent Claim
16 words
A delay line as claimed in claim 1, wherein said weighting function is a Hamming function.
References Cited (Backward Citations)
US3310761A
Cited
US3376572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |