Patent ID: 9325430
Filing Date: 2016-04-26
CPC Classification: A61B,G06K,H04B

Claim Text:
1. A communication system comprising: an interrogator that: a plurality of responders each having a unique resonant frequency corresponding to one of the plurality of carrier wave frequencies, wherein each of the plurality of responders that is tuned to a corresponding switched carrier-wave frequency communicates the response signal to the interrogator in response to the transmitted non-modulated interrogation signal, wherein the interrogator performs switching of the carrier wave frequency based on a decision that information of the response signal is completely acquired from one of the plurality of responders, and wherein the plurality of responders comprise a clock generation circuit generating, from the non-modulated interrogation signal, a clock for a digital operation of the plurality of responders or another circuit, wherein the clock is generated by setting the average value of the non-modulated interrogation signal as a threshold and digitizing the non-modulated interrogation signal.