JP2011196752A - Waveform measuring instrument, waveform display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waveform measuring instrument for displaying normalized event data when displaying wave data and event data.SOLUTION: The waveform measuring instrument for displaying wave data and an event signal using a waveform memory 11 for storing the waveform data by a ring method and an event memory 11 for storing by correlating at which point of the waveform data the event signal is generated when the event signal is generated, includes a waveform memory ring counter 10 for counting the cycle frequency of a write-in pointer of the waveform memory 11, an event search circuit 12 for searching the event signal in the display range from the event memory 11 using the value of the counter, and a waveform data converting unit 107, a display control unit 108 and a display device 109 for displaying the waveform data in the display range and the searched event signal.

Description

  The present invention relates to a waveform measuring instrument and a waveform display method, and more particularly to a technique for displaying an analog signal waveform and an event signal on the same screen.

  2. Description of the Related Art Conventionally, a technique for acquiring a waveform of an analog signal and a specific event signal in a waveform measuring instrument and displaying at which point on the waveform the event has occurred has been disclosed (for example, see Non-Patent Document 1).

Goro Nakayama 3 others, “Scopecorder DL750”, Yokogawa Technical Report, Yokogawa Electric Corporation, issued July 22, 2003, Vol. 47, No-3, pages 27-30

  FIG. 5 shows a display example of the waveform measuring instrument having the display function. In order to display at which point on the waveform an event has occurred, as shown in FIG. 5, this waveform measuring instrument has two storage areas: a waveform memory for storing waveform data and an event memory for storing event data. Have The event memory stores the write address of the waveform memory when the event signal is acquired in order to store at which point the event signal has occurred on the waveform.

  In addition, for example, when it is necessary to continuously acquire data until a predetermined trigger occurs, the waveform measuring instrument determines the interval between the start address and the end address of the waveform memory because the storage capacity of the waveform memory is finite. Operate like a ring buffer. That is, the waveform memory sequentially stores the waveform data from the start address, and when writing reaches the end address, returns the write pointer to the start address, and then sequentially overwrites again from the start address. Hereinafter, such a mechanism is referred to as a ring method.

  The problem of the conventional waveform measuring instrument when the ring type memory is employed will be described with reference to FIG.

  At the start of data collection, the waveform data is written to the start address of the waveform memory, and the waveform data is sequentially written toward the end address. As shown in FIG. 6, first, event 1 occurs at a predetermined point on the first lap of the ring, event 2 occurs at a predetermined point on the second lap, and then event 3 occurs at a predetermined point on the third lap. To do. At this time, for example, when the range indicated by the bold line in FIG. 6 is designated by the operator and the waveform measuring instrument displays the designated range as shown in FIG. 5, only the event 3 that originally occurred within the designated range is displayed. Events 1 and 2 are preferably not displayed because they occurred in the past from the specified range. However, since the conventional waveform measuring instrument does not consider the number of ring laps, events 1 and 2 are displayed in the same manner as event 3.

  The present invention has been made to solve the above-described problems, and in the case of storing data in a ring system, a waveform measuring instrument that displays only regular event data when displaying waveform data and event data. An object of the present invention is to provide a waveform display method.

  In order to solve the above-described problem, a waveform measuring instrument of one embodiment of the present invention includes a first storage unit that stores waveform data in a ring manner, a counter that counts the number of times of writing pointers in the first storage unit, and an event When the event occurs, a second storage unit that stores the value of the write address of the first storage unit when the event occurs and the value of the counter when the event occurs in association with each other, and stores the event data Based on the value and the address value of the first storage unit corresponding to the specified range, a search unit that searches the second storage unit for event data corresponding to an event that occurred in the above range, and a waveform in the above range And a display unit for displaying event data retrieved by the retrieval unit.

  The waveform display method of one embodiment of the present invention includes a first storage unit that stores waveform data in a ring manner, and a write address value of the first storage unit when an event occurs when the event occurs. A waveform display method for a waveform measuring instrument that displays waveform data and event data using a second storage unit that stores the event data, wherein the waveform measuring instrument determines the number of rounds of the write pointer in the first storage unit. Count, and based on the count value and the address value of the first storage unit corresponding to the specified range, search the second storage unit for event data corresponding to the event that occurred in the above range, and In addition to displaying the waveform data, the retrieved event data is displayed.

  According to the waveform measuring instrument and the waveform display method of the present invention, it is possible to search only a necessary part of event data, and to display regular event data when displaying waveform data and event data.

It is a figure which shows an example of a structure of the waveform measuring device which concerns on this Embodiment. It is a figure explaining an example of the content memorized by event data concerning this embodiment. It is a figure explaining an example of operation | movement of the event search circuit which concerns on this Embodiment. It is a figure explaining the operation example of the display control part which concerns on this Embodiment. It is a figure which shows the example which displays an event and a waveform on the same screen with a waveform measuring device. It is a figure explaining the problem of the conventional waveform measuring device.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, the configuration of the waveform measuring instrument of the present embodiment will be described with reference to FIG. The waveform measuring instrument 1 includes an input amplifier 101, an A / D converter 102, a memory control unit 103, a sampling timing generator 104, a waveform memory 105, a waveform memory ring counter 10, an event data converter 106, an event memory 11, and an event search. The circuit 12 includes a waveform data conversion unit 107, a display control unit 108, a display device 109, and an input device 110.

  The waveform signal is input to the input amplifier 101 of the waveform measuring instrument 1 as an analog signal, and is normalized to an appropriate input range level of the A / D converter 102 by the input amplifier 101. The waveform signal is then converted into a digital signal by the A / D converter 102. The waveform data converted into a digital signal by the A / D converter 102 is stored in the waveform memory 105 under the control of the memory control unit 103. This series of operations is executed based on the timing signal generated and output from the sampling timing generator 104.

The waveform memory ring counter 10 counts how many times the write pointer to the waveform memory 105 has been rotated. That is, the waveform memory ring counter 10 counts up when the write pointer to the waveform memory 105 reaches the end address and returns to the start address. In the waveform memory 105 of this embodiment, the entire waveform memory is a ring system, but a part of the waveform memory may be a ring system.

  The event signal is transmitted when an event specified by the user occurs, for example, when the user presses a predetermined button or when a predetermined cycle occurs, and is converted into a digital signal by the event data converter 106. When the event signal is input, the event data converter 106 outputs a control signal to the memory control unit 103 so that the write address to the waveform memory 105 at that time is taken into the event memory 11. In addition, the event data converter 106 outputs a control signal to the memory control unit 103 so as to acquire a value stored in the waveform memory ring counter 10. By outputting these control signals, the event memory 11 stores the write address to the waveform memory 105 and the value of the waveform memory ring counter 10 when the event signal is input. The digitized event signal is stored as event data in the event memory 11 via the memory control unit 103 based on the timing signal generated and output from the sampling timing generator 104.

  FIG. 2 shows an example of contents written in the event memory 11. FIG. 2 shows that one event signal is transmitted when the waveform memory ring counter value is 0 (first round), one event signal is transmitted when the waveform memory ring counter value is 1, and the waveform memory ring In this example, two event signals are transmitted when the counter value is 2. When the write pointers to the waveform memory 105 when each event signal is transmitted are addresses a, b, c, and d in order, the event memory 11 has “0”, address a, “1”, and address. The values b, “2” and address c, and “2” and address d are stored in association with each other.

Returning to the description of FIG. The waveform data conversion unit 107 and the display control unit 108 are ASIC (Application
When the display range is designated by the user via the input device 110, the waveform data in the display range is acquired from the waveform memory 105, and the display is displayed from the event memory 11. Event data within the range is acquired using the event search circuit 12, and the acquired data is converted into a predetermined display format and displayed to the user via the display unit 109.

  The display control unit 108 derives which address in the waveform memory 105 the display range corresponds to when the display range is specified by the user via the input device 110. Of the derived address values, a start address value (hereinafter referred to as a start end address value) for the display range is output to the waveform data conversion unit 107. The waveform data converter 107 outputs the acquired start address value to the event search circuit 12.

  The event search circuit 12 searches for event data to be displayed from the event data stored in the event memory 11 based on the address value output from the waveform data conversion unit 107. The operation of the event search circuit 12 will be described with reference to FIG. FIG. 3 shows an example when the start address of the display range is the address e. In addition, the event data is sequentially stored in the storage area of the event memory 11 in the order in which the event signals are transmitted.

The event search circuit 12 searches the event memory 11 for an area where the first event data is stored within the display range. As the method, first, the event search circuit 12 subtracts 1 from the current count value of the waveform memory ring counter 10 (“2” in the example of FIG. 3) (“1” in the example of FIG. 3), and the address e. The event memory 11 is searched for an area in which a set with a larger and minimum address value is stored. If there is a corresponding area, the event data stored in the event memory 11 after that area and that area become event data within the display range. If there is no corresponding area, the event search circuit 12 next specifies the first area from the event memory 11 in the area where the current count value (“2” in the example of FIG. 3) is stored. . In the example of FIG. 3, the third area from the top of the event memory 11 corresponds to this. The area specified here and the event data stored in the event memory 11 after that area become event data within the display range.

  Returning to the description of FIG. The waveform data conversion unit 107 acquires the first area searched from the event search circuit 12 (the address value of the event memory 11), and acquires event data stored in and after that area from the event memory 11. To the display control unit 108.

  The display control unit 108 reads out waveform data in the derived address value range from the waveform memory 105, and acquires event data from the waveform data conversion unit 107. As shown in FIG. 4, the display control unit 108 displays the waveform data AW via the display 109, and the read address value of the waveform memory 105 and the address of the event data acquired from the waveform data conversion unit 107. When the values match, the event information EW is output via the display device 109.

  As described above, when data is stored in the ring method, only regular event data can be displayed when displaying waveform data and event data.

  The first storage unit corresponds to the waveform memory 105 of the present embodiment, and the second storage unit corresponds to the event memory 11 of the present embodiment. The counter corresponds to the waveform memory ring counter 10 of the present embodiment, and the search unit corresponds to the event search circuit 12 of the present embodiment. The display unit corresponds to the waveform data conversion unit 107, the display control unit 108, and the display 109 of the present embodiment.

  The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is shown by the scope of claims, and is not restricted by the text of the specification. Moreover, all modifications, various improvements, substitutions and modifications belonging to the equivalent scope of the claims are all within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Waveform measuring device 10 Waveform memory ring counter 11 Event memory 12 Event search circuit 101 Input amplifier 102 A / D converter 103 Memory control part 104 Sampling timing generator 105 Waveform memory 106 Event data converter 107 Waveform data conversion part 108 Display control 109 Display 110 Input device

Claims (5)

A first storage unit for storing waveform data in a ring manner;
A counter for counting the number of laps of the write pointer of the first storage unit;
Second memory for storing event data in association with the value of the write address of the first storage unit when the event occurs and the value of the counter when the event occurs when the event occurs And
A search unit that searches the second storage unit for event data corresponding to an event that has occurred in the range, based on the value of the counter and the address value of the first storage unit corresponding to the specified range;
A display unit for displaying the waveform data in the range, and displaying event data searched by the search unit;
A waveform measuring instrument. The waveform measuring instrument according to claim 1,
The search unit searches the second storage unit for event data corresponding to an event occurring in the range based on the value of the counter and the address value of the first storage unit corresponding to the start position of the range. A waveform measuring instrument characterized by: The waveform measuring instrument according to claim 2,
The waveform measuring instrument, wherein the display unit displays event data searched by the search unit and event data stored in an area after the area where the event data is stored. A first storage unit that stores waveform data in a ring manner; and a second storage unit that stores, as event data, a value of a write address of the first storage unit when the event occurs when an event occurs. Using a waveform display method of a waveform measuring instrument for displaying the waveform data and the event data,
The waveform measuring instrument is
Count the number of laps of the write pointer of the first storage unit,
Based on the value of the count and the address value of the first storage unit corresponding to the specified range, the event data corresponding to the event that occurred in the range is searched from the second storage unit,
A waveform display method for displaying waveform data in the range and displaying searched event data. The waveform display method according to claim 4,
Searching event data corresponding to an event occurring in the range from the second storage unit based on the count value and the address value of the first storage unit corresponding to the start position of the range. How to display the waveform.

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