1. A device comprising:
a substrate;
a first interdigital transducer (IDT) configured to receive a first electrical signal and generate, from the first electrical signal, a surface acoustic wave that propagates along the substrate; and
a second IDT that is located on the substrate and has fingers that extend from two opposite terminals and are configured based on a code, the two opposite terminals being short circuited together so that the second IDT will receive the surface acoustic wave from the first IDT and reflect, back to the first IDT, a surface acoustic wave that includes a code based on a configuration of the fingers;
the first IDT being configured to output, from the reflected surface acoustic wave, a second electrical signal that is based on the code.
2. The device of claim 1 wherein the first IDT has two opposite terminals and fingers, the fingers extending from the terminals and overlying the substrate.
3. The device of claim 1 wherein the first electrical signal is a single pulse.
4. The device of claim 1 wherein the code is defined by relative positions of fingers of the second IDT.
5. The device of claim 1 wherein the second IDT is a three-finger IDT in which, corresponding to each unit of the code, the IDT has one finger coupled to one of the terminals and two fingers coupled to the other of the terminals.
6. A device comprising:
a substrate;
a first interdigital transducer (IDT) configured to receive a first electrical signal and generate, from the first electrical signal, a surface acoustic wave that propagates along the substrate; and
a second IDT that is located on the substrate and has fingers that extend from two opposite terminals and are configured based on a code, the two opposite terminals being open circuit terminated so that the second IDT will receive the surface acoustic wave from the first IDT and reflect, back to the first IDT, a surface acoustic wave that includes a code based on a configuration of the fingers;
the first IDT being configured to output, from the reflected surface acoustic wave, a second electrical signal that is based on the code.
7. The device of claim 6 wherein the first IDT has two opposite terminals and fingers, the fingers extending from the terminals and overlying the substrate.
8. The device of claim 6 wherein the first electrical signal is a single pulse.
9. The device of claim 6 wherein the code is defined by relative positions of fingers.
10. The device of claim 6 wherein the second IDT is a three-finger IDT in which, corresponding to each unit of the code, the IDT has one finger coupled to one of the terminals and two fingers coupled to the other of the terminals.
11. A method comprising:
receiving, by a first interdigital transducer (IDT), an electrical signal;
generating, by the first IDT, from the received electrical signal, a surface acoustic wave;
generating, by a second IDT, from the surface acoustic wave, a reflected surface acoustic wave that includes a code; and
outputting, by the first IDT, from the reflected coded surface acoustic wave, a coded electrical signal.
12. The method of claim 11 wherein the received electrical signal is a single pulse.
13. The method of claim 11 wherein the code is defined by relative positions of fingers.
14. The method of claim 11 wherein the second IDT has opposite terminals that are open circuit terminated.
15. The method of claim 11 wherein the second IDT has opposite terminals that are short circuited to each other.
16. A method comprising:
receiving, by a first interdigital transducer (IDT), an electrical signal;
generating, by the first IDT, from the received electrical signal, a first surface acoustic wave;
generating, by a second IDT, from the surface acoustic wave, a first reflected surface acoustic wave, the second IDT having opposite terminals that are open circuit terminated or closed circuited together;
generating, by a third IDT, from the surface acoustic wave, a second reflected surface acoustic wave, the third IDT having opposite terminals that are connected to a sensor that imparts, across the terminals, an impedance that is a function of a sensed property to cause the magnitude or phase of the second reflected surface acoustic wave to be a function of the property;
outputting, by the first IDT, respectively from the first and second reflected surface acoustic waves, first and second return electrical signals; and
determining a value of the property based on a comparison of said magnitude or phase of the first and second return electrical signals to each other.
17. The method of claim 16 wherein the property is selected from temperature and moisture.
18. The method of claim 16 wherein said magnitude or phase is magnitude.
19. The method of claim 16 wherein said magnitude or phase is phase.
20. The method of claim 16 wherein, in the receiving step, the received electrical signal is received from an antenna, and, in the outputting step, the return electrical signals are output to an antenna.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A computer system, comprising:
a plurality of storage device systems including one or more remote-copy purpose logical volumes, and
one or more high-rank apparatuses connected to each of said storage device systems, said plurality of storage device systems being connected to each other via a network,
wherein said plural remote-copy purpose logical volumes configure remote-copy groups,
wherein said plural remote-copy purpose logical volumes configuring said remote-copy groups being controlled such that said logical volumes have same contents among said plural storage device systems,
sharedexclusive control using a shared logical volume which is unconscious of said remote copy being performed using said high-rank apparatuses in an environment where said remote copy is used, said high-rank apparatuses being connected to said logical volumes within each of said remote-copy groups.
2. A data control method in the computer system according to claim 1, wherein said sharedexclusive control is performed by a Reserve-oriented command of SCSI command.
3. The computer system according to claim 1, wherein said high-rank apparatuses are connected to each other via a network thereby to be formed into a cluster, said sharedexclusive control being performed using said logical volumes within said storage device systems at the time of a failure of said network for connecting said high-rank apparatuses.
4. The computer system according to claim 1, wherein said sharedexclusive control is performed by a Lock file.
5. The computer system according to claim 1, wherein said sharedexclusive control is performed by a Lock sector.
6. The computer system according to claim 3, wherein said computer system is formed into said cluster by MSCS.