US3701147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface wave devices for signal processing
Assignee: United States Department of the Navy
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Filing: 1971-02-03
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Granted: 1972-10-24
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Expires: 1991-02-03
Abstract
Abstract A distributed-transducer surface wave device for signal processing of the type which comprises a crystal substrate upon which is disposed at least one transducer set, including an input transducer adapted for connection to an input electrical signal and an output transducer, each transducer including at least a pair of interdigitated electrodes, the application of an electrical signal to the input transducer causing surface wave propagation on the surface of the crystal substrate, the electrodes of the transducers being aligned in a direction perpendicular to the direction of wave propagation, wherein the interdigitations of the electrodes are generally coded, for example, according to a Barker code. The surface wave device further comprises a logic decision circuit having three input connections: (1) a first input connected to the output transducer; (2) a second adapted for connection to a clock sync source; and (3) a third adapted for connection to a source of binary signals; the output of the logic decision circuit being connected to the input transducer. A function of the logic devision circuit is to enable an incoming pulse from the binary signal source, if present, to be transmitted to the input transducer, otherwise to enable pulses from the output transducer to be circulated through the transducer set, all pulses being clocked by signals from the clock sync source. One of the main functions of the acoustic wave devices of this invention is to serve as a delay line for the propagating surface wave.
Inventors
- 👤 Harper John Whitehouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:18
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02818; H03H9/02834; G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195; G11; G11C; G11C21/00; G11C21/02; G11C21/023; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/326; H03B7/00; H03H9/30; H03H9/42
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
229 words
A distributed-transducer acoustic wave device, for signal processing, comprising: a crystal substrate; at least one transducer set disposed upon the crystal substrate, each transducer set including at least an input transducer adapted to receive an input electrical signal and an output transducer, each input and output transducer including at least a pair of interdigitated electrodes which, upon application of a signal to the input transducer, cause acoustic wave propagation on the surface of the crystal substrate, the electrodes of each transducer of each transducer set being aligned in the direction of wave propagation; the interdigitations of the electrodes of at least one of the transducers of at least one of the transducer sets being coded; and a logic decision circuit having three input connections: 1. a first input connected to the output transducer; 2. a second adapted for connection to a clock sync source; and 3. a third adapted for connection to a source of binary signals; the logic decision circuit having its output connected to the input transducer; a function of the logic decision circuit being to enable an incoming pulse from the binary signal source, if present, to be transmitted to the input transducer, otherwise to enable a pulse from the output transducer to be circulated through the transducer set, all pulses being clocked by signals from the clock sync source; the combination forming a time compressor.
Claim 2
Dependent Claim
229 words
A distributed-transducer acoustic wave device, for signal processing, comprising: a crystal substrate; at least one transducer set disposed upon the crystal substrate, each transducer set including at least an input transducer adapted to receive an input electrical signal and an output transducer, each input and output transducer including at least a pair of interdigitated electrodes which, upon application of a signal to the input transducer, cause acoustic wave propagation on the surface of the crystal substrate, the electrodes of each transducer of each transducer set being aligned in the direction of wave propagation; the interdigitations of the electrodes of at least one of the transducers of at least one of the transducer sets being coded; and a logic decision circuit having three input connections: 1. a first input connected to the output transducer; 2. a second adapted for connection to a clock sync source; and 3. a third adapted for connection to a source of binary signals; the logic decision circuit having its output connected to the input transducer; a function of the logic decision circuit being to enable an incoming pulse from the binary signal source, if present, to be transmitted to the input transducer, otherwise to enable a pulse from the output transducer to be circulated through the transducer set, all pulses being clocked by signals from the clock sync source; the combination forming a time compressor.
Claim 3
Dependent Claim
11 words
a second adapted for connection to a clock sync source; and
Claim 4
Dependent Claim
11 words
a second adapted for connection to a clock sync source; and
Claim 5
Dependent Claim
15 words
The combination as recited in claim 1, wherein: the substrate consists of a piezoelectric crystal.
Claim 6
Dependent Claim
83 words
a third adapted for connection to a source of binary signals; the logic decision circuit having its output connected to the input transducer; a function of the logic decision circuit being to enable an incoming pulse from the binary signal source, if present, to be transmitted to the input transducer, otherwise to enable a pulse from the output transducer to be circulated through the transducer set, all pulses being clocked by signals from the clock sync source; the combination forming a time compressor.
Claim 7
Dependent Claim
83 words
a third adapted for connection to a source of binary signals; the logic decision circuit having its output connected to the input transducer; a function of the logic decision circuit being to enable an incoming pulse from the binary signal source, if present, to be transmitted to the input transducer, otherwise to enable a pulse from the output transducer to be circulated through the transducer set, all pulses being clocked by signals from the clock sync source; the combination forming a time compressor.
Claim 8
Dependent Claim
13 words
The combination as recited in claim 2, wherein: the piezoelectric crystal is quartz.
Claim 9
Dependent Claim
14 words
The combination as recited in claim 1, wherein: the code is a Barker code.
Claim 10
Dependent Claim
52 words
The combination as recited in claim 1, further comprising: a second transducer set disposed upon the crystal substrate, the electrodes of the transducer sets being disposed upon the crystal substrate in a parallel relationship; the input and output transducers of the second transducer set also being connected to the logic decision circuit.
Claim 11
Dependent Claim
36 words
The combination as recited in claim 5, further comprising: an isolator divider strip disposed upon the substrate between each transducer set; and an absorber stripe disposed upon the substrate at each End of a transducer set.
Claim 12
Dependent Claim
20 words
The combination as recited in claim 6, wherein the two transducer sets are coded according to a coded complementary pair.
Claim 13
Dependent Claim
75 words
The combination as recited in claim 1, further comprising: an input amplifier connected to the input transducer, for impressing an amplified input electrical signal upon the electrodes of the input transducer, the electrical signal being transduced to an acoustic surface wave traversing the surface of the substrate in a direction toward the output transducer; and an output amplifier connected to the output transducer for amplifying the signal transduced by the electrodes of the output transducer.
Claim 14
Dependent Claim
74 words
The combination as recited in claim 8, further comprising: an analog-to-digital converter, connected to the input of the logic decision circuit, whose output forms a plurality of binary input signals, the plurality equal to the number of digits into which the analog signal is converted, and equal to the number of transducer sets; and a digital-to-analog converter, connected to the output transducers, for converting the plurality of binary signals into its corresponding analog form.
Claim 15
Dependent Claim
31 words
The combination according to claim 9, further comprising: a clock source disposed upon the same substrate, for clocking the propagation of the pulses in the various channels of the time compressor.
Claim 16
Dependent Claim
73 words
The combination according to claim 10, further comprising: another transducer set, consisting of an input and an output transducer, mounted on the same substrate; a frequency translator, whose input is connected to the output of the digital-to-analog converter and whose output is connected to the input transducer of the last-named transducer set; the frequency translator having another input adapted for connection to an oscillator, for causing a frequency translation of the input signal.
Claim 17
Dependent Claim
14 words
The combination according to claim 11, wherein the frequency translator is a single-sideband modulator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |