| 摘要 |
PURPOSE:To realize a paper feed at a constant speed at all times, by writing the input analog signal into a memory after converting it into the digital signal in a sampling cycle and reading and recording the input analog signal in a lower clock cycle. CONSTITUTION:The oscillator 30 produces the pulse of a repetitive frequency TS. This pulse is divided by the divider circuit 31 into n(2-5), and the pulse of a proper cycle TW according to the maximum frequency of the input analog signal is selected by the switch 36. The oscillator 40 produces the pulse a repetitive cycle of TR<TS and decides the recording cycle to the recording paper. The input analog signal is converted into the digital signal by the ADC22 with the cycle TW set to the sampling cycle. The counters 32 and 42 plus the FF33 and 43 are controlled by the control signal supplied from the pulse generating circuit 50. Then the output signal of the ADC22 is read into the memories 24 and 23 of shift register type successively in the period of 2<n>TW and then read out via the gate groups 26 and 25 in the period of 2<n>TR in the order of the read-in to be recorded on the recording paper. The paper feed motor is stopped in the period of 2<n>(TW-TR), but the feed speed of the motor is constant. |
