초록 ▼

Variations, due to aging, of resonant frequency characteristics of electromechanical resonators are compensated by an oscillator including the resonantor. An indication of the amount of time that the oscillator is operating addresses a table of values indicative of the manner in which the oscillator

Variations, due to aging, of resonant frequency characteristics of electromechanical resonators are compensated by an oscillator including the resonantor. An indication of the amount of time that the oscillator is operating addresses a table of values indicative of the manner in which the oscillator changes frequency as the resonator ages. From the table of values a signal having a value indicative of a correction factor for the resonator aging is derived. The frequency of the oscillator is controlled in response to the value of the correction factor. The table of values is stored in a re-programmable memory. The values stored in the memory are corrected by comparing the oscillator frequency with a standard frequency.

대표청구항 ▼

Apparatus for compensating for variations due to aging in resonant frequency characteristics of an electromechanical resonator, said compensating apparatus comprising an oscillator including the resonator, means responsive to the number of cycles generated by the oscillator for deriving a first sign

Apparatus for compensating for variations due to aging in resonant frequency characteristics of an electromechanical resonator, said compensating apparatus comprising an oscillator including the resonator, means responsive to the number of cycles generated by the oscillator for deriving a first signal indicative of the amount of time that the oscillator has been operating, computer means responsive to the first signal for deriving a second signal having a value indicative of a correction factor for the resonator aging, and means for controlling the frequency of the oscillator in response to the value of the second signal.