| 摘要 |
An electronic watch Figure 1 including a timekeeping circuit 1 and display 6, is provided with an automatic time indication modifier 7 to 12. The modifier comprises a pick- up 7, e.g. a piezo-electric or electret microphone, a filter 9 for passing only that component of a signal picked up from a radio or television receiver, which has the same frequency as a transmitted time announcement signal, a pulse height discriminator 10 for converting an output signal of the filter into a bi-level signal in accordance with the magnitude of the output signal above a threshold level, a time announcement pattern discrimination circuit 11 responsive to the bi-level signal from the discriminator to determine the presence of a time announcement pattern on the basis of the duration of and the time interval between the bi-level signals, and a "seconds" indication modifying and control circuit 12 for modifying a "seconds" indication of the watch in response to an output signal from the discrimination circuit. <IMAGE> |
