| 摘要 |
PURPOSE:To decrease the missing of sudden signals having large amplitude, by shifting the level of other input to a neighboring channel, suppressing the amplitude of one input or output in correspondence with the magnitude of said voltage, and recording the other input in high priority. CONSTITUTION:Of three channel pen recorders CH1-CH3, the CH2 is recorded in high priority. An amplitude limiter is formed from input terminals 1-3 to output terminals 1'-3', in the area including operation amplifiers A11-A33, transistors Q1 and Q2, and resistors R11-R37. In the same area, a driving amplifier for a pen motor is formed after the terminals 1'-3'. A DC component is applied to the output -e12 from the amplifier A21 by level shifters B1 and B2. For example, when the output eb1 of the level shifter B1 is larger than an input ei1 to the CH1, the transistor Q1 is turned ON, the gain of the amplifier A12 is decreased, and the output eo1 of the CH1 is decreased. In this way, the output eo2 of the CH2 can be recorded in high priority. |
