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Indicating a movement of an ultrasonic tag is accomplished by a transducer operable to provide electrical signals caused by the movement. The movement can cause mechanical vibrations, sound vibrations, or pressure in the transducer, to generate the electrical signals. A controller can detect the ele

Indicating a movement of an ultrasonic tag is accomplished by a transducer operable to provide electrical signals caused by the movement. The movement can cause mechanical vibrations, sound vibrations, or pressure in the transducer, to generate the electrical signals. A controller can detect the electrical signal from the transducer generated by the movement, whereupon the controller obtains tag data and modulates the tag data to be supplied to a powered up emitter. The emitter transmits the modulated tag data in a transmission to an ultrasonic tag reader using an ultrasonic carrier sound wave.

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1. An ultrasonic data tag operable to provide an indication of movement, the ultrasonic data tag comprising: a transducer operable to generate an electrical signal upon being subjected to movement, wherein the electrical signal is produced by sound vibrations of the transducer due to movement of the

1. An ultrasonic data tag operable to provide an indication of movement, the ultrasonic data tag comprising: a transducer operable to generate an electrical signal upon being subjected to movement, wherein the electrical signal is produced by sound vibrations of the transducer due to movement of the tag;a controller coupled to the transducer, the controller operable to detect the electrical signal from the transducer generated by the movement;a memory coupled to the controller, the memory including data to be read by the controller when the electrical signal is detected by the controller, and wherein the data in the memory includes tag identity data to be used in response to an ultrasonic trigger from the ultrasonic tag reader; andan emitter coupled to the controller, wherein upon the controller detecting the electrical signal, the emitter is powered up and receives modulated data from the controller for transmission to an ultrasonic tag reader using an ultrasonic carrier sound wave, and wherein the data transmitted by the emitter includes the tag identity data. 2. The ultrasonic data tag of claim 1, wherein data in the memory includes at least one movement code to be used in response to the electrical signal produced from the movement, and wherein the data transmitted by the emitter in response to the movement is the at least one movement code. 3. The ultrasonic data tag of claim 2, wherein the at least one movement code is used to initiate an external activity via the ultrasonic reader reading the movement code. 4. The ultrasonic data tag of claim 1, further comprising a battery, wherein the emitter is powered by the battery and transmits the data repeatedly until the transducer is no longer subject to movement. 5. The ultrasonic data tag of claim 1, further comprising a battery, wherein the emitter is powered by the battery, and wherein the emitter transmits the data repeatedly until the tag is deactivated. 6. The ultrasonic data tag of claim 1, further comprising a battery, wherein the emitter is powered by the battery, and wherein the emitter transmits the data repeatedly until the tag receives a subsequent trigger signal from the ultrasonic reader. 7. The ultrasonic data tag of claim 1, wherein the controller is further operable to increment a counter in the memory every time it receives the electrical signals. 8. The ultrasonic data tag of claim 1, further comprising a clock coupled to the controller, wherein the clock provides a measurement of period of time when the tag was moved, and wherein the controller is further operable to compare the period of time to a previously stored period of time in the memory, and wherein the controller will store the larger period of time in the memory. 9. The ultrasonic data tag of claim 1, further comprising a battery. 10. An ultrasonic data tag operable to provide an indication of movement, the ultrasonic data tag comprising: a transducer operable to generate an electrical signal upon being subjected to movement;a controller coupled to the transducer, the controller operable to detect the electrical signal from the transducer generated by the movement;a memory coupled to the controller, the memory including data to be read by the controller when the electrical signal is detected by the controller; andan emitter coupled to the controller, wherein upon the controller detecting the electrical signal, the emitter is powered up and receives modulated data from the controller for transmission to an ultrasonic tag reader using an ultrasonic carrier sound wave; and an analog-to-digital converter coupled to the transducer, wherein the analog-to-digital converter provides a measurement of an amplitude of the electrical signals to the controller, and wherein the controller is further operable to compare the measured amplitude to a previously stored amplitude in the memory, and wherein the controller will store the larger amplitude in the memory. 11. An ultrasonic data tag operable to provide an indication of movement, the ultrasonic data tag comprising: a transducer operable to generate an electrical signal upon being subjected to sound vibrations of the transducer due to movement of the tag;a controller coupled to the transducer, the controller operable to detect the electrical signal from the transducer generated by the movement;a memory coupled to the controller, the memory including data to be read by the controller when the electrical signal is detected by the controller, and wherein the data in the memory includes tag identity data to be used in response to an ultrasonic trigger from the ultrasonic tag reader;a battery controller by the controller; andan emitter coupled to the controller, wherein upon the controller detecting the electrical signal, the emitter is powered up by the battery and receives modulated data from the controller for transmission to an ultrasonic tag reader using an ultrasonic carrier sound wave, and wherein the data transmitted by the emitter includes the tag identity data. 12. A method for indicating a movement of an ultrasonic data tag, the method comprising the steps of: generating an electrical signal by a transducer upon being subjected sound vibrations of the transducer due to movement of the tag;detecting the electrical signal from the transducer generated by the movement;reading data from a memory upon detecting the electrical signal, and wherein the data in the memory includes tag identity data to be used in response to an ultrasonic trigger from the ultrasonic tag reader;powering up an emitter; andmodulating the data in a transmission to an ultrasonic tag reader using an ultrasonic carrier sound wave, and wherein the data transmitted by the emitter includes the tag identity data.