# US 10,311,259 B2 · Use of a tag and reader antenna for a simulated Theremin effect > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,311,259 B2 - Document ID: US10311259B2 - Status: Granted - Kind: B2 - Application number: 15/861,836 - Filed: 2018-01-04 - Published: 2018-07-05 - Granted: 2019-06-04 - Earliest claimed: 2013-12-30 - Assignees: Verily Life Sciences LLC - Applicants: Verily Life Sciences LLC - Inventors: Brian Otis; Nathan Pletcher - Web page: https://patentgrep.com/patent/US10311259B2 ## CPC - G06K 7/10217: {parameter settings controlling the transmission power of the interrogator} - G06K 7/10128: {the step consisting of detection of the presence of one or more record carriers in the vicinity of the interrogation device} - G06K 7/10316: {using at least one antenna particularly designed for interrogating the wireless record carriers (antennas in general H01Q1/22)} - G06K 7/10366: {the interrogation device being adapted for miscellaneous applications} - A61B 5/6821: {Eye} - A61B 2560/0214: of power generation or supply - A61B 2562/08: Sensors provided with means for identification, e.g. barcodes or memory chips - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract The present disclosure provides methods and apparatuses for providing an audible feedback based on a proximity or a link quality between an external reader and a tag. The external reader transmits power to the tag with a radio frequency electromagnetic signal. The tag may rectify the radio frequency electromagnetic signal and create a rectified voltage. This rectified voltage may be used to power various components of the tag. Once it receives power from the reader, the tag may communicate information back to the external reader. The information communicated back to the reader is communicated by modulating an antenna impedance of the tag. By modulating the impedance, the tag will backscatter radiation transmitted by the reader. The reader is able to create an audio output based on determining the proximity or link quality from the reader to the tag based on the backscatter radiation it receives from the tag. ## Claims ### Claim 1 A device comprising: an antenna configured to: transmit electromagnetic radiation having a power level, and receive backscatter electromagnetic radiation from a sensing device configured to take measurements; and a control unit configured to interpret an indication of a supply voltage in the sensing device from the received backscatter electromagnetic radiation and generate a signal based on the indication of the supply voltage in the sensing device; and a visual indicator configured to generate a visual output based on the generated signal. ### Claim 2 (depends on 1) The device of claim 1, further comprising an audio unit configured to generate an audio output based on the generated signal. ### Claim 3 (depends on 1) The device of claim 1, wherein the control unit is further configured to alter the generated signal based on a change in the supply voltage. ### Claim 4 (depends on 1) The device of claim 1, wherein the backscatter electromagnetic radiation provides data and the control unit determines the supply voltage based on the data. ### Claim 5 (depends on 1) The device of claim 1, wherein the control unit is further configured to alter the power level based on at least one of (i) a proximity between the sensing device and the device and (ii) a link quality between the sensing device and the device. ### Claim 6 (depends on 1) The device of claim 1, wherein the generated signal provides an indication of a functionality of the sensing device. ### Claim 7 (depends on 1) The device of claim 1, wherein the sensing device is an eye-mountable device. ### Claim 8 (depends on 1) The device of claim 1, wherein the device is a wearable device. ### Claim 9 A method comprising: transmitting electromagnetic radiation having a power level via an antenna; receiving backscatter electromagnetic radiation from a sensing device configured to take measurements via the antenna; interpreting an indication of a supply voltage in the sensing device from the received backscatter electromagnetic radiation; and generating a visual signal based on the indication of the supply voltage in the sensing device. ### Claim 10 (depends on 9) The method of claim 9, further comprising outputting an audio signal based on the generated signal. ### Claim 11 (depends on 9) The method of claim 9, further comprising altering the visual signal based on a change in the supply voltage. ### Claim 12 (depends on 9) The method of claim 9, wherein the supply voltage is determined based on data provided by the backscatter electromagnetic radiation. ### Claim 13 (depends on 9) The method of claim 9, further comprising altering the power level based on at least one of (i) a proximity between the device that caused the backscatter electromagnetic radiation and a reader and (ii) a link quality between the device that caused the backscatter electromagnetic radiation and the reader. ### Claim 14 (depends on 9) The method of claim 9, wherein the generated visual signal provides an indication of a functionality of the device that caused the backscatter. ### Claim 15 (depends on 9) The method of claim 9, wherein the sensing device is an eye-mountable device. ### Claim 16 (depends on 9) The method of claim 9, wherein the visual signal provides an indication when the supply voltage is too low for correction system functionality. ### Claim 17 An non-transitory computer-readable medium having stored thereon processor-executable instructions that, when executed by a processor in a radio-frequency system, cause the radio-frequency system to: transmit electromagnetic radiation having a power level via an antenna; receive backscatter electromagnetic radiation from a sensing device configured to take measurements via the antenna; interpret an indication of a supply voltage in the sensing device from the received backscatter electromagnetic radiation and generate a signal based on the indication of the supply voltage in the sensing device to cause a visual indicator to output a visual signal. ### Claim 18 (depends on 17) The non-transitory computer-readable medium of claim 17, further comprising processor-executable instructions that, when executed by a processor in a radio-frequency system, cause the radio-frequency system to generate an audio signal based on the generated signal. ### Claim 19 (depends on 17) The non-transitory computer-readable medium of claim 17, further comprising processor-executable instructions that, when executed by a processor in a radio-frequency system, cause the radio-frequency system to alter the signal based on a change in the supply voltage. ### Claim 20 (depends on 17) The non-transitory computer-readable medium of claim 17, wherein the supply voltage is determined based on data provided by the backscatter electromagnetic radiation. ### Claim 21 (depends on 17) The non-transitory computer-readable medium of claim 17, further comprising processor-executable instructions that, when executed by a processor in a radio-frequency system, cause the radio-frequency system to alter the power level based on at least one of (i) a proximity between the sensing device and a reader and (ii) a link quality between the sensing device and the reader. ### Claim 22 (depends on 17) The non-transitory computer-readable medium of claim 17, wherein the generated signal provides an indication of a functionality of the sensing device. ### Claim 23 (depends on 17) The non-transitory computer-readable medium of claim 17, wherein the sensing device is an eye-mountable device. ### Claim 24 (depends on 17) The non-transitory computer-readable medium of claim 17, wherein the signal provides an indication when the supply voltage is too low for correction system functionality.