JP2791684B2 - Waveform recorder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform recorder particularly suitable for multi-channel waveform recording.

(Conventional example)

When recording a multi-channel input signal waveform with a waveform recorder or the like, it is necessary to know which channel the recorded waveform belongs to. Therefore, in a conventional waveform recorder, as shown in FIG.
For example, in the case of two channels, the effective recording width of the recording paper is divided into upper and lower tiers in the longitudinal direction, and channel 1 (CH1)
Is recorded in the upper part, and the waveform of channel 2 (CH2) is recorded in the lower part.

As another example, as shown in FIG. 5 (B), for example, the waveform of channel 1 may be recorded with a thicker line than normal, and the waveform of channel 2 may be recorded with a line of normal thickness.

[Problems to be solved by the invention]

In the example of FIG. 5A, there is a problem that the waveform recording width of each channel is narrowed and the resolution is reduced. In the example of FIG. 7B, the problem of resolution reduction can be avoided, but the number of types of lines that are intuitively easy to see is limited, and the number of channels is limited accordingly. Also, 1
If the recording waveform of one channel happens to be close to the recording waveform of another channel, it is troublesome to visually discriminate the channel even if the line type is different, which is not preferable in any case.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to utilize the entire effective width by a line having a normal thickness of the apparatus without dividing the effective recording width of the recording paper or changing the line type. And record the signal waveform of each channel, and simultaneously write the leader line and the channel number of the waveform for each recorded waveform, making it easy to distinguish the waveforms while maintaining the original resolution of the device. To provide a waveform recorder.

[Means for solving the problem]

FIG. 1 shows an embodiment of a waveform recorder to which the present invention is applied. According to the figure, this device is, for example, a channel.
An A / D converter 1 for digitally converting a signal to be measured input from CH1, CH2,..., A storage memory 2 for holding the converted data for each channel, and print data converted from the data in the memory 2. , A printer 4 for recording the input signal waveform of each channel on a recording paper 5 in a dot form based on the data in the memory 3, a CPU 6 and a control program 7 for controlling the operation of these units. And

Now, to simplify the explanation, the input signal under measurement is, for example,
It is assumed that there are two channels, CH1 and CH2, and their recording waveforms are as shown in FIG.

In the figure, reference numerals 1 and 2 denote channel numbers of the recording waveform, and lines below the channel numbers are leader lines. a is position data indicating the writing start point of the leader line, which is a code shown in the drawing for convenience of description, and is not written on the recording paper. L is data representing the length of a leader line, and S is data representing the position interval between adjacent leader lines.

In this embodiment, in order to solve the above-mentioned problem, a lead line and its channel number are written in a recording waveform. The control program 7 shown in FIG. Means.

I. A data processing routine for the CPU 6 to sequentially convert the waveform data of each channel in the storage memory 2 into print data, and record the waveform in the printer 4
7a.

B. A parameter initialization routine 7b for initializing the connection parameters such as the position data of the leader line in order to write the leader line and its channel number for each recording waveform.

C. After the initialization, a channel number writing routine 7c for writing a leader line of a predetermined length and a channel number of the waveform at a predetermined position of the recording waveform.

[Action]

By providing the means (a), the CPU 6 can cause the printer 4 to record a signal waveform as shown in FIG. In addition, by providing the means of (b) and (c), a leader line having a predetermined length L for each constant interval S and a number indicating the channel number of the waveform in the vicinity thereof are provided in parallel with the waveform recording of (b). Can be written.

〔Example〕

Referring also to FIG. 3, in order to cause the storage memory 2 to take in the digitally converted data of the input signal of each channel, for example, from the address 0 to T
T addresses are prepared up to address -1. Further, the printer 4 is provided with, for example, N multi-needle recording electrodes from No. 0 to No. N-1, and the print data memory 3 has addresses 0 to N- corresponding to the respective recording electrodes. N addresses up to address 1 are provided.

If the input signal data at each address t in the storage memory 2 is 8 _(H) for CH1 and 7 C _(H) for CH2, the CPU 6 executes the data processing routine 7
a for each of these data
_(D) and 124 _(D) and converted to 8 in the print data memory 3.
Addresses 1 and 124 are set. Hereinafter, the input signal data at the address t after CH3 is also converted into print data, and the corresponding address in the memory 3 is similarly set to 1.

When the data conversion for one line at address t of each channel is completed in this way, the CPU 6 sends the print data memory 3
Is swept from address 0 to address N-1. As a result, a single pulse signal is sent from the address designated as 1 in the memory 3 and is applied as a trigger pulse to a driver circuit (not shown) in the printer 4. This driver circuit is, for example, a group of switching elements each having an output of each address of the print data memory 3 as a trigger input, and the switching element to which the trigger pulse is applied is turned on to turn on the corresponding recording electrodes 8 and 124. Supply current to
One line of recording is performed in dot form on the recording paper 5 facing the electrodes. If this operation is sequentially executed for each channel from the address 0 to the address T-1 of the storage memory 2, a continuous waveform as shown in FIG. 2 is obtained.

Next, writing of the lead line and the channel number will be described. The parameters used in this embodiment are shown below.

S: represents an interval (the number of dots) between the writing start position of one leader line and the writing start position of the next leader line, and indicates a preset value (see FIG. 2).

Here, the number of dots represents, for example, the number of addresses or the number of data in the storage memory.

s: A value obtained by actually counting the value of S (the number of dots) by a counter (not shown) during waveform recording.

L: The length of the leader line (the number of dots), which indicates a preset value (see FIG. 2).

l: A value obtained by actually counting the value of L (the number of dots) by a counter (not shown) at the time of writing the leader line.

CH: Indicates the channel number of the recording waveform.

a: Indicates the write start position of the lead line, and actually indicates the data at address t of the channel waveform (see FIG. 2).

Flag: Refers to a flag in the CPU 6 that indicates whether to write a leader line and a channel number.

 Here, it is assumed that the flag represents flag = 0... Is not written.

The recording of the waveform data and the writing of the leader line and the channel number are performed in parallel as described above, and an example of the operation control is shown in FIG. FIG. 7A shows a basic routine for writing data, which includes, for example, a waveform recording routine similar to the conventional one, a parameter initialization routine, and a channel number writing routine, which have not been provided before.

In writing data, for example, first, the storage memory of each channel is set to address 0 (t = 0), and then the channel numbers and the like are written in parallel with the waveform recording, so that parameters are initialized. ing.

An example of this parameter initialization is shown in FIG. 3B. For example, the count value l of the counter that regulates the length of the leader line to a predetermined length L is zero (1 = 0), and the channel number is Writing should be performed from the first channel, and CH
Is 1 (CH = 1). The flag and a are each set to zero (flag = 0, a = 0).

Regarding the count value s of the counter that regulates the lead line to be written at each predetermined interval S, in the case of initialization at the start of waveform recording, for example, an initial value having a size such that 0 <initial value <S Is given as an offset (s
= Initial value).

After the start of the waveform recording, the dot count value is added to the initial value. When a predetermined interval value S is reached, the flag is set to 1 and the dot count value s is cleared to zero as shown in FIG. , The lead line and the channel number of the waveform are written.

The initial value is appropriately set according to the size of the interval value S. For example, when S is 120 dots, it is preferable to set the initial value to about half, that is, about 50 to 60 dots. In this way, as shown in the example of FIG. 2, for example, for the waveform of channel 1, the first lead line and the channel number are written earlier, and the other channel waveforms are recorded closer. Even in this case, it becomes easier to determine which channel number has the waveform.

〔effect〕

As described above in detail, the waveform recorder according to the present invention converts the input signals under measurement of multiple channels into digital signals, and the CPU converts the above converted data into print data by a control program, and applies the converted data to the printer. In addition to recording the signal waveform on the recording paper, the control program includes a parameter initialization routine and a channel number writing routine, and a fixed length for each recording waveform at predetermined intervals in parallel with the recording of the signal waveform. , And the channel number of the waveform in the vicinity of the leader line.

Therefore, according to the present invention, even when a multi-channel input signal waveform is recorded close to the recording paper, it is possible to intuitively determine which waveform belongs to which channel, and it is extremely difficult for the user. An easy-to-use device can be provided.

Further, it is not necessary to divide the paper width of the recording paper into several layers in the longitudinal direction according to the number of channels, for example, and it is possible to effectively use the paper width of each channel for waveform recording. There is no loss of resolution.

[Brief description of the drawings]

FIGS. 1 to 4 relate to an embodiment of the present invention, FIG. 1 is a block diagram showing the configuration of the apparatus, FIG. 2 is an explanatory view showing an example of a lead line and a channel number writing method, FIG.
FIG. 4 is a diagram for explaining the relationship between channel input signal data and waveform writing on recording paper, FIG. 4 is a flowchart showing an example of a case in which waveform recording and writing operations of leader lines and channel numbers are controlled by software, and FIG. FIG. 4 is an explanatory diagram of a waveform recording method in a conventional device. In the figure, 1 is an A / D converter, 2 is a storage memory, 3
Is a data memory for printing, 4 is a printer, 5 is a recording paper, 7b is a parameter initialization routine, 7c is a channel number writing routine, CH1 and CH2 are channel numbers, S is a lead line interval, and L is a lead line length. is there.

Claims (1)

(57) [Claims] 1. A multi-channel input signal to be measured is digitally converted and fetched into a memory, the data in the memory is converted into print data and applied to a printer, and the input signal waveforms of the respective channels are recorded on recording paper. In the waveform recorder to be recorded, parameters of a lead line length parameter L and a lead line writing interval parameter S are included, and the lead line writing is performed on each of the input signal waveforms in parallel with the recording of the input signal waveforms. For each fixed writing interval based on the interval parameter S, the lead line length parameter L is set in accordance with a predetermined channel order.
And a channel number writing means for writing a channel number of the waveform in the vicinity of the lead line and a parameter related to the writing of the lead line and the channel number. Parameter initializing means for initializing at the waveform recording start position, wherein the interval between the waveform recording start position and the first leader line writing position is determined by the subsequent leader line writing interval parameter S. A waveform recorder characterized by being set to a value smaller than the interval between lines.