| 摘要 |
An electronic watch providing optical and audible readouts, controlled by a number of predetermined pulse trains, each pulse of which being produced by the user's tapping or otherwise impacting a small electroacoustic transducer, which also provides the audible readout. A switch may be substituted for the transducer, thus foregoing audible readout capability. An easily learned coded series of tone bursts identifies the numbers in the audible time readout. The alarm capability, armed and disarmed by appropriate pulse trains, includes an alarm register which can be read out and set by appropriate pulse trains and, supplemented by an additional counter to form a duration register, serves as a stopwatch adapted not only for conventional timing of external events, but also for precision setting of the minute and second counters. An auxiliary register may hold month and date information to be read out and set in response to appropriate pulse trains. Security means virtually eliminate the possibility that a random series of pulses might affect the setting of any of the counters or arm the alarm, and provide a series of optical displays separated by dark intervals, each of substantially shorter duration than a display, and constituting a narrow time gate within which a control pulse is effective, a pulse during display aborts operation and reverts the instrument to its quiescent or passive operational state. With low power consumption display elements, e.g. liquid crystal displays, time may be displayed constantly except when the user, by a pulse train, otherwise controls the watch. With higher power consumption elements, time is displayed only when interrogated by the user.
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