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A new practical time and frequency signal processing method can be used to generate an accurate time signal, for stable phase step, for frequency change and synthesis, and for other related uses. The method accomplishes the time and frequency signal processing by changing the period and phase of the machine cycle of a microcomputer. It is based on pulse deletion of a high frequency clock signal, quantified phase delay, and other intentional variations in a microcomputer clock signal circuit. The pulse deletion and phase delay can be implemented periodically or individually for different purposes, and a frequency change and synthesis or phase shift of the microcomputer output signal can be obtained. With this method, the time signal processing precision can be from several tens of nanoseconds to less than 1 ns.