| http://www.w3.org/ns/prov#value | - Wireless sensors may also be used, communicating via infrared beams, acoustic, radio frequency, e.g., 46-49 MHz, 900 MHz, or other bands, using analog, digital or multilevel quantized digital amplitude modulation (AM), frequency modulation (FM), phase shift keying (PSK), quadrant amplitude modulation (QAM), or other modulation scheme, or a combination thereof.
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