JP3284149B2 - Method for searching waveform data in waveform recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for retrieving recorded data in a waveform recording device, and more particularly, to transfer and hold waveform data obtained by sampling an input signal to an external recording device or the like. The present invention relates to a recorded data search method in a case where desired data is searched out from the data and a waveform analysis is performed.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional general waveform recording apparatus for recording an input signal waveform of, for example, four channels. The analog input signal of each channel is sampled, for example, in the input amplifier 1, and its level is converted into digital data. The CPU 4 instructs the memory controller 2 to start the operation, and causes the waveform data of each channel to be taken into a predetermined area of the memory 2a.

When the waveform data reaches, for example, the last address of each area, the CPU 4 stops the data fetching operation of the memory controller 2 once, reads out the data stored in the memory 2a, and transfers it to an FDD (external recording device) 7. And record. Thereby, the waveform data of each channel is held in the FDD 7.

When recording on the FDD 7 is completed, the CPU 4 restarts the operation of the memory controller 2 and causes the memory 2a to take in the waveform data. When the waveform data reaches the last address of the memory 2a, the CPU 4 stops the operation of the memory controller 2, reads out the data stored in the memory 2a, and transcribes the data to the FDD 7, for example, until the recording data reaches a predetermined amount. repeat. When the amount of data to be recorded on the FDD 7 reaches a predetermined amount, the CPU 4 operates the memory controller 2.
Is stopped, and the data stored in the memory 2a is cleared.

[0005] Waveform analysis is generally performed in the following procedure. That is, the CPU 4 first stops the operation of the memory controller 2, reads, for example, waveform recording data of a desired channel from the FDD 7, and loads the waveform recording data from the first address to the last address of the memory 2a. Next, the CPU 4 reads out the loaded waveform data and supplies the read waveform data to, for example, the display 5, and the operator of the apparatus visually observes the waveform image displayed on the display 5.

In this case, if a portion requiring analysis is found, the CPU 4 supplies the waveform data in the memory 2a to the printer 6 and prints out an enlarged waveform diagram and the like. Thereafter, the CPU 4 reads out the next waveform data from the FDD 7 and loads it into the memory 2a. The loaded data is given to the display 5 to update the display waveform and search for a portion requiring analysis is repeated. The waveform data is fetched into the memory 2a via the memory controller 2, and the CPU 4 transcribes the waveform data to the FDD 7,
The operation mode of each unit, such as loading the recording data of the FDD 7 into the memory 2a, is instructed by operating the keyboard 8, for example.

[0007]

As described above, in this conventional apparatus, a portion requiring analysis is searched for while visually observing the display waveform of the display 5, which is a general method. It takes time depending on the frequency of the input signal. One example will be described with reference to FIG.

In FIG. 4A, N1, N2, N3,.
FIG. 4B shows an input signal of a channel 1 having, for example, a triangular waveform, and FIG. 4C shows waveform data of the channel 1 recorded on the FDD 7. .

Here, it is assumed that the memory 2a fetches, for example, n pieces of waveform data sampled m times for each wave of each channel input signal. However, m is a constant value,
n has a different value depending on the frequency of the channel input signal. It is also assumed that the recording capacity of the FDD 7 is not smaller than the total storage capacity of the memory 2a.

In such a conventional apparatus, when mn pieces of waveform data for n waves of channel 1 are fetched into the corresponding channel area of the memory 2a, all of the data are stored in the FD.
D7 can be transcribed (FIG. 4 (C)), and this FDD
7 can be all loaded into the channel 1 area of the memory 2a.

When the data loaded in the memory 2a is given to the display 5, the waveform shown in FIG. 4B is displayed, and locations requiring waveform analysis are, for example, a, b, c,.
・ ・ It is understood that it is a part. In this case, for example, the data of (a) and its vicinity are given to the display 5 and FIG.
As shown in (1), the same data is supplied to the printer 6, and an enlarged waveform diagram of the portion is printed out and provided for waveform analysis. The same applies to parts such as b and c.

However, when the frequency of the input signal is high as shown in FIG. 4E, the signal is input to a channel having a memory area larger than the memory area for channel 1. For example, if the channel 4 is suitable, the waveform data of the signal input to the channel 4 is continuously taken into the channel area of the memory 2a as shown in FIG.

When a predetermined number of data enters the memory area of the channel 4, the memory controller 2 stops the data fetch operation, and the CPU 4 transcribes the waveform data fetched into the area to the FDD 7. Thereafter, as in the case of the channel 1, the data recorded in the FDD 7 is loaded into the memory 2a and then supplied to the display 5 to search for a portion requiring analysis while observing the display waveform.

In this case, when all the recording data of the FDD 7 is loaded into the channel 4 area of the memory 2a and given to the display 5, the waveform of FIG. 4E is displayed on the screen. However, when the frequency is high, the preceding and following waveforms are close to each other, and it becomes difficult to distinguish abnormal portions of the waveform due to noise such as A, B, and C in FIG.

Therefore, of the waveform data of FIG. 4F recorded on the FDD 7, for example, the first mn data are loaded into the channel 1 area of the memory 2a. When this data is given to the display 5, the waveform of FIG. 7E is displayed almost in the same manner as in FIG. 7B in which the time axis is enlarged, and it is possible to easily search for a waveform variation portion. Thereafter, similarly, the second and third mn pieces of data of FIG. 4F are sequentially loaded into the channel 1 area of the memory 2a, and the waveform thereof is displayed on the display 5 to determine whether or not there is a change portion. Search for.

In the above example, for example, when the first mn data and the third, fifth, and sixth mn data are displayed, abnormal portions of the waveform are not found, but the second, fourth, and fourth data are displayed. When the 7th mn data is displayed,
Abnormal change points of a, b, and c are found respectively. When this portion is enlarged and displayed on the display 5, an image shown in FIG. 4 (G) is obtained, and the same image is emitted by the printer 6 and subjected to waveform analysis.

When the frequency of the input signal is high as described above, the FD is set to such an extent that the abnormally changing portion of the waveform can be visually searched.
It is necessary to divide the recording data of D7 and load it into the memory 2a. Further, when all the recording data of the FDD 7 is loaded into the memory 2a, it is necessary to divide the loaded data so that the abnormally changed portion can be visually searched and give the divided data to the display 5.

Incidentally, if one change point of the waveform is captured, it is possible to analyze the change phenomenon itself such as the change level and the time width of the change. However, when investigating the cause of the change, etc., whether the change is a single occurrence,
Alternatively, it is necessary to know whether the data has randomness or periodicity, and there is a case where the captured data at one location is insufficient for the judgment data.

Therefore, in FIG.
It is not enough to find the abnormal variation point A of the waveform when the mn pieces of the divided data are displayed on the display 5, and the search is performed by dividing and displaying all the recorded data of the FDD 7. Therefore, a great deal of time is required for searching depending on the frequency of the input signal.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a method of searching for waveform record data for easily searching for waveform data of a portion of an input signal waveform that requires analysis. It is in.

[0021]

According to the present invention, there is provided a first memory controller which divides waveform data of a channel input signal recorded in, for example, an FDD into observable numbers and loads the divided data into a memory. Data including a second trigger level setting memory controller for automatically extracting data at a location requiring analysis from the divided FDD waveform data by comparing it with a trigger level and loading the data into a memory The gist of the present invention is to provide a capturing means.

[0022]

When the waveform data fetched by the former means is applied to, for example, a display device, a continuous waveform of a plurality of channel input signals corresponding to the number of data is displayed.
When the waveform data captured by the latter means is added to a display device, the waveform of a portion of the channel input signal that requires analysis is automatically displayed.

[0023]

FIG. 1 shows an embodiment of the present invention. In FIG. 1, an input amplifier 1, a CPU 4, a display 5, a printer 6, an FDD 7, a keyboard 8, and the like have substantially the same configuration as the unit of the conventional device. In this embodiment, in addition to the above units, for example, a first memory controller 2 and two memories 2a and 2b,
Memory controller 3 and a memory 3a.

The operation modes of the first and second memory controllers 2 and 3 are controlled by the CPU 4, and the memory controller 2 stores, for example, the waveform data sampled from the input signals of the respective channels by the input amplifier 1 into the memory 2a.
2b, and those data transcribed to the FDD 7 are loaded into the same memory. The memory controller 3 holds the trigger conditions set by operating the keyboard 8, for example, and loads data conforming to the trigger conditions in the waveform data applied from the FDD 7 into the memory 3a.

Here, the operation of each part will be described with reference to FIG. 2 together with an example in which the input signal of channel 1 has a triangular waveform. N1, N2 in FIG.
N3,... Are external noises that enter the channel input signal at certain time intervals, FIG. 2B is an input signal of channel 1 having, for example, a triangular waveform, and FIG. It is assumed that waveform data is sampled m pieces for each signal wave.

When the memory controller 2 receives a data fetch mode operation command from the CPU 4, the memory controller 2 receives a predetermined number of waveform data, for example, n of the input signal, as shown in FIG.
The mn pieces of waveform data of the wave are fetched into the memory 2a, and then the mn pieces of the same number of waveform data as described above are fetched into the memory 2b as shown in FIG. Hereinafter, this operation is repeated alternately.

As shown in FIG. 2F, the CPU 4 fetches the waveform data from the other memory 2b or 2a while the memory controller 2 fetches the waveform data into one memory 2a or 2b. The data is read, transferred to the FDD 7, and recorded. With this, FDD
7, the waveform data of (C) is continuously recorded, and when the recording data reaches a predetermined amount, the CPU 4 stops the data fetching operation of the memory controller 2.

Next, for example, when data loading is instructed by the keyboard 8, the CPU 4 issues a load command to the memory controllers 2 and 3, reads out 2mn waveform data from the FDD 7, and gives the waveform data to the two memory controllers.
As a result, data is loaded into the memories 2a and 2b via the memory controller 2 as shown in FIG. When a trigger condition for detecting a portion requiring a waveform analysis such as an abnormal change in an input signal level is set in the memory controller 3 by using the keyboard 8, the memory 3a is stored in the memory 3a as shown in FIG. Is loaded with waveform data matching the trigger condition.

Here, for example, when a data display is instructed by the keyboard 8, the CPU 4 reads the data loaded in the memories 2a and 2b in order from the memory 2a, and also reads the data loaded in the memory 3a. Give to display 5. An example of data display on the display 5 is shown in FIG.

In this embodiment, for example, the display screen of the display 5 is divided into upper and lower parts, as shown in FIG. 1J, and the data in the memories 2a and 2b are displayed in a continuous waveform on the upper side. On the lower side, the waveform of the data in the memory 3a suitable for the trigger condition is displayed with the time axis and the level axis enlarged. The waveform data applied to the display 5 is sequentially updated at a desired speed, and the displayed waveform is scrolled.

As a result, it is convenient to use the continuous waveform displayed on the upper side as a monitor for a channel input signal. The waveform displayed on the lower side is naturally used for waveform analysis. When the waveform analysis is completed, the next waveform data is stored in the memory 2 from the FDD 7 as shown in FIG.
a, 2b and the memory 3a, and give them to the display 5 for display in the same manner as described above.

[0032]

As described above, according to the present invention, the waveform data continuously recorded on the FDD 7 is the first data.
The memory controller 2 loads the data into the memories 2a and 2b by a predetermined number, sequentially displays the data on the upper side of the screen of the display 5, and transmits the data via the second memory controller 3 in which a desired trigger condition is set. Data conforming to the trigger condition is loaded from a predetermined number of waveform data into the memory 3a, and the data is automatically displayed on the lower side of the screen of the display 5.

Therefore, it is not necessary to provide the display 5 with waveform data every time to search for a portion that requires analysis by visual inspection each time, and it is extremely easy for a device operator to reduce the time required for waveform analysis and to reduce fatigue. It is valid.

On the upper side of the screen of the display 5,
Since a continuous waveform including a portion requiring analysis is displayed, if it is used for monitoring the entire channel input signal, it is convenient for setting new trigger conditions.

In terms of the structure of the apparatus, the memories 2a and 2b
In this method, the recording data of the FDD 7 is divided and loaded, and particularly, only the data that meets the trigger condition is loaded in the memory 3a.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a waveform recording apparatus according to the present invention.

FIG. 2 is an explanatory diagram of a waveform data processing method according to the present invention.

FIG. 3 is a block diagram showing an electrical configuration of a conventional device.

FIG. 4 is an explanatory diagram of a method of processing waveform data in a conventional device.

[Explanation of symbols]

 Reference Signs List 1 input amplification unit 2 memory controller 2a memory 2b memory 3 memory controller 3a memory 4 CPU 5 display 6 printer 7 FDD (external recording device)

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-4-72518 (JP, A) JP-A-2-17456 (JP, A) JP-A-2-17416 (JP, A) JP-A-5-172 52886 (JP, A) Japanese Utility Model 4-71175 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01R 13/00-13/42

Claims (1)

(57) [Claims] 1. A method in which waveform data obtained by sampling from a channel input signal is recorded in a memory, transferred to an external recording device and held, and a waveform analysis is required from data held by the external recording device. In a method of searching for waveform data in a waveform recording device that searches for data at a location and outputs the data to a display device or a printer, an operation of writing the waveform data of the input signal to a memory or stopping the writing is controlled by a CPU. A first memory controller, at least first and second memories for alternately recording the waveform data by a predetermined number under the control of the first memory controller; and an external memory for the input signal waveform data. Holds the trigger condition of the digital value given from and writes waveform data to memory Or a second memory controller whose write stop operation is controlled by the CPU independently of the first memory controller, and records waveform data conforming to the trigger condition under the control of the second memory controller. A third memory for storing the waveform data of the input signal during a period in which one of the first and second memories is recording the waveform data of the input signal. The waveform data is alternately transferred to the external recording device via the CPU to cause the same device to hold a continuous predetermined amount of waveform data. Thereafter, the first memory controller sequentially transmits a predetermined amount of waveform data from the external recording device. Once the waveform data is received, it is fetched into the first and second memories, and the data is output to the display device or the printer, and While displaying and printing out the continuous waveform of the signal, the second memory controller receives the same waveform data as the first memory controller, automatically extracts the waveform data that meets the trigger condition, and 3. The waveform recording device according to claim 3, wherein said data is output to said display device or printer, and said enlarged waveform of a portion requiring analysis is displayed and printed out in parallel with said continuous waveform. Search method for waveform data.