JPH028172Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of an analog waveform recording device.

[Technical background of the invention and its problems] In a conventional device of this kind, one recorded waveform on the recording paper corresponds to one input signal. For this reason, for example, when one input signal slightly fluctuates with respect to the full scale, a recorded waveform as shown in FIG. 1 will result if the signal gain is small. In the figure, 1 is recording paper and 2 is a recording waveform. However, although large changes can be seen overall in the recorded waveform 2 on the recording paper 1, minute fluctuations are difficult to grasp. On the other hand, when the signal gain is increased, minute fluctuations in the signal can be clearly seen from the recording waveform 3 shown in FIG. There is a problem with it. Therefore, it may be possible to automatically shift the scale when the waveform 3 is about to protrude from the recording paper 1 so that the recorded waveform 3 always remains on the recording paper 1 as shown in FIG. Similarly, it is difficult to grasp overall changes.

[Purpose of the invention] The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide an analog waveform recording device that can simultaneously grasp minute fluctuations and overall changes in one input signal.

[Summary of the invention] This invention amplifies one input signal with different signal gains that can be set arbitrarily and converts the signal into two or more recording signals. This is an analog waveform recording device that records the above analog waveform.

[Embodiment of the invention] FIG. 4 is a configuration diagram showing an embodiment of the apparatus of the invention applied to, for example, a thermal recording type recording system. That is, this device includes an input circuit section 11 that receives an input signal S from the outside, and first and second circuits that amplify the output signal of this input circuit section 11 with different gains and convert it into two types of recording signals. signal converter 12,1
3 and a recording section 14. The gain of the first signal converter 12 and the gain of the second signal converter 13 can be set arbitrarily and are determined depending on what kind of recording waveform is to be obtained on the recording paper 15. For example, if you want to know the overall change and minute fluctuations, the gain of the first signal converter 12 is set to "1", whereas the gain of the second signal converter 13 is set to "1".
The gain of is determined to be "2" or more. The opposite may be true.

The recording section 14 includes the first and second signal conversion sections 1
First and second A-D converters 141 and 142 digitize recording signals No. 2 and No. 13, respectively.
A CPU 144 processes the outputs of these A-D converters 141 and 142 via an input/output port 146 according to a program in a read-only memory (ROM) 143, and converts the data processed by this CPU into a pattern. Random access
Memory (RAM) 145 and input/output port 146
, shift register 147, and driver 148
and a thermal head 149. 150 is a motor driver, and 151 is a motor for transporting the recording paper 15.

Therefore, in the case of the above recording section 14, the CPU
At 144, the first and second A-D converters 14
Each of the 1,142 digital signals is individually received, converted into a signal that can be easily recorded in the random access memory 145, and provided to the random access memory 145.
This memory 145 has a bit memory for pattern creation equal to the number of head elements of the thermal head 149, sets the bit memory corresponding to the input signal value of the first signal converter 12 to "1", and similarly sets the bit memory corresponding to the input signal value of the first signal converter 12 to "1". A pattern is created in which the bit memory corresponding to the input signal value of the section 13 is set to "1" and the other bit memories are set to "0". After that, CPU14
4 sequentially reads the patterns from the memory 145, stores them in the shift register 147, outputs them in parallel from the shift register 147, and supplies them to the driver 148. This driver 148 is connected to the thermal head 14.
By applying an energizing signal to each head element of 9, the recording paper 15 is
Two types of analog waveforms are recorded simultaneously on the top.

Therefore, in the above-described device, when one signal S is input from the outside, the signal S is taken in by the input circuit section 11, and then the first and second signal conversion sections 12, 13 in parallel and input.
Here, the first and second signal converters 12 and 13
amplify the signals from the input circuit section 11 with different predetermined gains, convert them into recording signals, and supply the signals to the recording section 14. This recording section 14 records the recording signals from the first and second signal conversion sections 12 and 13 completely independently and simultaneously on the same recording paper 15, recording waveforms 16 of the first gain and waveforms of the second gain. It is recorded as a recording waveform 17. Therefore, if the gains of the first and second signal converters 12, 13 are appropriately selected, two recorded waveforms 16, 1 representing the overall change and minute fluctuations can be recorded on the same recording waveform 15.
7 can be recorded simultaneously.

Note that the first and second signal converters 12 and 13
If the output is simply subjected to one-to-one scale conversion, the recording waveform 17 with the larger gain will protrude from the recording paper 15 when the input signal S changes significantly, and the signal change will become indiscernible. As a means to solve this problem, it is conceivable to provide the signal conversion section with the larger gain, for example, the 13 side, with a function of automatically shifting the scale according to the input signal value. According to this, the recording waveform 17' always remains within the recording width as shown in FIG. That is, when the recording waveform 17' protrudes from the right edge of the recording paper 15,
A recording waveform 17' extending from the left end appears. In this case, it is difficult to unambiguously determine the input signal value only from this recording waveform 17', but since the recording waveform 16 with a small gain is also recorded at the same time, the recording waveform 1 with a small gain
6, the input signal value of the recording waveform 17' can be known.

[Effects of the invention] As detailed above, according to the invention, one input signal is amplified by two arbitrarily settable different signal gains to obtain two or more recording signals, and these recording signals can be amplified by two arbitrarily settable different signal gains. Since the input signals are simultaneously recorded on the same recording paper, it is possible to provide an analog waveform recording device that can simultaneously grasp the overall change and minute fluctuations of the input signal from the recorded waveform on the same recording paper.

[Brief explanation of drawings]

1 to 3 are diagrams showing recorded waveforms on recording paper by a conventional device, FIG. 4 is a block diagram showing an embodiment of the device of the present invention, and FIG. 5 shows a part of the device in FIG. 4. It is a recording waveform diagram obtained by deformation. DESCRIPTION OF SYMBOLS 11... Input circuit section, 12... First signal conversion section, 13... Second signal conversion section, 14... Recording section, 15... Recording paper.

Claims (1)

[Scope of utility model registration request] an input circuit section that takes in one input signal; a first signal conversion section that amplifies the output signal of the input circuit section using an arbitrarily settable first gain and converts it into a first recording signal; , a second signal conversion section that amplifies the output signal of the input circuit section by an arbitrarily settable second gain different from the first gain and converts it into a second recording signal; and a memory section that patterns each recording signal value from the second signal conversion section, and a plurality of head elements arranged in the recording width direction of the recording paper, and supplies each pattern signal read out from the memory section. 1. An analog waveform recording device comprising: a thermal head which receives the signals and thermally records them independently on the same recording paper.