ELECTRONIC CLOCK WITH RADIO WAVE RECEIVING FUNCTION

摘要

PROBLEM TO BE SOLVED: To provide an electronic clock with radio wave receiving function capable of receiving standard waves 40 kHz, 60 kHz, and 77.5 kHz which are the standard waves of a country or regions, which can be housed in a small space of clock, without enlarging the shape so much, at a low cost. SOLUTION: This electronic clock with radio wave receiving function comprises an antenna, an oscillation circuit, a local oscillation circuit for forming at least two local oscillation frequencies on the basis of a reference signal, a channel selecting means, a MIX circuit, an IF circuit, a wave detecting circuit for detecting IF signals, and a control part for forming time information from the output of the wave detecting circuit. This clock is constituted capable of receiving standard waves of any combination of 77.5 kHz, 60 kHz and 40 kHz, as selectable frequency and receivable by the channel selecting means. The oscillation circuit can be used also as the reference oscillation circuit of the clock.