US3833867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic surface wave convolver with bidirectional amplification
Assignee: Unisys Corp
•
Filing: 1973-10-23
•
Granted: 1974-09-03
•
Expires: 1993-10-23
Abstract
Abstract Apparatus for the convolution of two input signals introduced at opposite ends of an acoustic surface wave propagation medium provides amplification of the two oppositely propagating signals and their integration in an intermediate semiconductor film cooperating with a contiguously overlying electrode pattern serving both as the signal output transducer and for coupling unidirectional electrical bias fields for amplifying the convolved output.
Inventors
- 👤 L Solie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:07
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
Signal convolver apparatus comprising: a body having first and second ends and active surface layer means adapted for propagating acoustic surface waves, first launcher means for launching a first acoustic wave adjacent said first end at said active surface layer means toward said second end, second launcher means for launching a second acoustic surface wave adjacent said second end at said active surface layer means toward said first end, said active surface layer means having cooperative semiconductive and piezoelectric properties in a region extending at least substantially between said first and second launcher means, conductive array means on said active surface layer means at said region including regularly spaced electrode finger Means for supporting cyclically alternating unidirectional bias electric fields of substantially equal magnitudes between successive pairs of said electrode finger means for causing amplification of said first and second acoustic surface waves, and transducer means for coupling from said conductive array means a sum frequency signal having a frequency equal to the sum of the frequencies of said first and second acoustic surface waves.
Claim 2
Dependent Claim
175 words
Signal convolver apparatus comprising: a body having first and second ends and active surface layer means adapted for propagating acoustic surface waves, first launcher means for launching a first acoustic wave adjacent said first end at said active surface layer means toward said second end, second launcher means for launching a second acoustic surface wave adjacent said second end at said active surface layer means toward said first end, said active surface layer means having cooperative semiconductive and piezoelectric properties in a region extending at least substantially between said first and second launcher means, conductive array means on said active surface layer means at said region including regularly spaced electrode finger Means for supporting cyclically alternating unidirectional bias electric fields of substantially equal magnitudes between successive pairs of said electrode finger means for causing amplification of said first and second acoustic surface waves, and transducer means for coupling from said conductive array means a sum frequency signal having a frequency equal to the sum of the frequencies of said first and second acoustic surface waves.
Claim 3
Dependent Claim
23 words
Apparatus as described in claim 1 wherein said active surface layer means in said region comprises mixer means for forming said sum frequency.
Claim 4
Dependent Claim
13 words
Apparatus as described in claim 2 wherein said body comprises a piezoelectric material.
Claim 5
Dependent Claim
23 words
Apparatus as described in claim 2 wherein said first and second launcher means comprises first and second planar interdigital transmission line input means.
Claim 6
Dependent Claim
11 words
Apparatus as described in claim 3 wherein said body comprises LiNbO3.
Claim 7
Dependent Claim
14 words
Apparatus as described in claim 2 wherein said body comprises a piezoelectric semiconductive material.
Claim 8
Dependent Claim
26 words
Apparatus as described in claim 1 wherein said active surface layer means comprises a thin film of a semiconductor material deposited on a piezoelectric material surface.
Claim 9
Dependent Claim
48 words
Apparatus as described in claim 2 wherein: said transducer means comprises first and second substantially parallel conductor means, said first conductor means is coupled to alternate ones of said electrode finger means, and said second conductor means is coupled to the remainder ones of said electrode finger means.
Claim 10
Dependent Claim
22 words
Apparatus as described in claim 8 including: bias source means coupled through inductive means across said first and second parallel conductor means.
Claim 11
Dependent Claim
32 words
Apparatus as described in claim 9 including: blocking capacitor means coupled between output matching network means for said sum frequency signal and the junction between said transducer means and said inductive means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |