| 摘要 |
PURPOSE:To process two asynchronous digital signals in one signal processing circuit by using the first and the second time zones selectively on a basis of the phase relation between the first and the second digital signal processings. CONSTITUTION:A signal processing circuit 1' consisting of an instruction program ROM 2' and a processing circuit 3' is connected to an interrupt phase measuring circuit 7 and a data bus 4. A time zone when the first signal processing is performed once and the first and the second time zones for the second signal processing are provided in one cycle of the first signal processing which the circuit 3' performs. If the second signal processing start request signal (b) is in a period (a), the second signal processing is performed in the second time zone for the second signal processing; and if the second signal processing start request signal (b) is in a period (d), the second signal processing is performed in the first time zone (e) for the second signal processing which comes first after the second signal processing start request signal. |
