Radio control alarm device

Abstract

An alarm device for ringing an alarm at a variable time comprises a receiver, a processor and a speaker. The receiver receives a radio frequency signal carrying a standard time and an alarm time correction and transfers the standard time and the alarm time correction to the processor after decoding the radio frequency signal. The processor is coupled to the receiving circuit for input of the standard time and the alarm time correction. The processor keeps the current time by and stores an alarm time reference. With the input of the standard time and the alarm time correction, the processor calibrates the current time with the standard time, corrects the reference to obtain an alarm time according to the correction, and outputs a driving signal at arrival of the alarm time. The speaker is coupled to the processor and driven to sound by the driving signal.

Dependencies are inferred from the claim text.