| 摘要 |
PURPOSE:To detect signal intermission stably for various distirbances by comparing an output signal of a positive peak detection circuit with an output signal of a negative peak detection circuit to detect the presence of signal intermission. CONSTITUTION:A timing signal (a) is received from an input terminal 1 and converted into a dual signal by a single/dual conversion circuit 2. Differential output signals b, c of duplicated 2-signal system are shifted to have a prescribed level difference by a level shift circuit 3 and a comparator circuit 4 compares the in-phase signals d, e from the circuit 3. The maximum DC level of the output waveform is detected by a positive peak detection circuit 5 from a signal (f) in output signals f, g via the circuit 4 and the minimum DC level is detected by a negative peak detection circuit 6 from the signal (g). Output signals h, i of the circuits 5, 6 are compared by a comparator circuit 7 to detect the signal intermission. Thus, the signal intermission is detected stably for various disturbances. |
