| http://www.w3.org/ns/prov#value | - FIG. 4A is a circuit diagram of the sub-carrier generator 222c shown in FIG. 3A. Referring to FIG. 4A, sub-carrier generator 222c includes inverters 51 and 52, a feedback resistor 53, a crystal resonator (or a ceramic resonator) 54, pull-down capacitors 55 and 56, and an AND gate 57 for amplitude modulation.
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