JPH07160735A - Waveform recorder - Google Patents

Abstract

PURPOSE:To easily reproduce an input signal waveform in the opposite direction by designating forward reproducing or backward reproducing to automatically update the waveform data in each work RAM. CONSTITUTION:In the case of forward reproducing, the data read line of a CPU 3 is connected to a third work RAM W3 by a first switch 5a after the last waveform data in a first work RAM W3 is sent to a display device 5 through the CPU 3, and following waveform data is read out. In the case of backward reproducing of the waveform, the third work RAM W3 is switched and connected to a magnetic tape device 6 by a second switch Sb because waveform data in this work RAM W3 is not used, and n waveform data preceding n data stored in the first work RAM Wl are taken in. Hereafter, first and second switches Sa and Sb are selectively operated to successively read out and fetch the waveform data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform recording device,
More specifically, the present invention relates to a waveform recording device that records digital waveform data of an input signal and reproduces its analog waveform from an arbitrary location in a forward direction or a reverse direction on a display unit or the like.

[0002]

2. Description of the Related Art A general example of a conventional waveform recording apparatus is shown in FIG. The analog input signal is sampled, for example, at the input section 1, and the digitally converted waveform data is once taken into the storage memory (DRAM) 2. When this waveform data reaches the required amount, for example, the CPU 3
Stops the data input to the DRAM 2 and reads the waveform data that has been captured up to that point, and the magnetic tape unit (MTU)
Post to 6, etc. Even when another type of signal is applied to the input unit 1, the waveform data is sequentially output in the same manner as above.
It will be recorded in U6.

The waveform data recorded in the MTU 6 is reproduced as an analog waveform on the display 5 or the like as follows. First, while observing the rotation count value of a tape counter (not shown) of the MTU 6, the magnetic tape is rewound to the head position where the desired waveform data is recorded. Next, while feeding the tape in the forward direction, the CPU 3 reads the waveform data and loads it into the DRAM 2. When the desired waveform data is loaded, stop the rotation of the magnetic tape and turn the DRAM2
The CPU 3 sequentially reads out the data loaded into the display and gives it to the display 5. As a result, the analog waveform of the input signal is reproduced.

Here, when recording the waveform data taken in the DRAM 2 into the MTU 6 or stopping the recording,
For example, a recording start button or stop button (not shown) of the operation unit 4 is pressed. When loading the waveform data recorded in the MTU 6 to the DRAM 2 or stopping the loading, for example, by pressing a load start button or the stop button (not shown) of the operation unit 4, the waveform of the input signal is displayed on the display 5. To stop the display, the reproduction start button or the stop button (not shown) of the operation unit 4 is pressed.

[0005]

In the above conventional device, the waveform data taken in the storage memory can be continuously recorded in the magnetic tape device and the waveform of the input signal can be reproduced on the display from an arbitrary position.

The reproduced waveform represents the change of the input signal with the passage of time, and is so-called forward reproduction. By the way, when there is an abnormal variation in the waveform of the input signal reproduced in the forward direction, there is a case where it is desired to analyze the variation phenomenon by replaying that portion, for example, after the variation and before the variation. However, it is difficult for the conventional apparatus to reproduce the data only in the forward direction.

The present invention has been made in consideration of the above circumstances, and an object thereof is to provide a waveform recording apparatus capable of reproducing a waveform in either the forward direction or the reverse direction.

[0008]

[Means for solving the problem] As a basic idea,
The storage memory 2 is dedicated to taking in sampling data of an input signal, and the memory to which the recording data is loaded from the magnetic tape device for waveform reproduction is separated from the storage memory.

Therefore, the present invention is provided with the following means to solve the above problems.

For example, assume that an analog waveform of an input signal is reproduced in a predetermined screen area of a display device by using n waveform data, and first, n continuous waveform data to be reproduced is loaded from a magnetic tape device. It has a first work RAM, and second and third work RAMs to which n continuous waveform data each preceding and following this n waveform data are loaded.

For example, the CPU is provided with a CPU for reading the n waveform data loaded from each of the first to third work RAMs and supplying the data to the display device to reproduce the analog waveform of the input signal. .

For example, a first switch for switching and connecting the waveform data read path of the CPU to the data output terminals of the three work RAMs in a predetermined order depending on whether the waveform of the input signal is forward reproduction or backward reproduction. And a waveform data transmission path of the magnetic tape device is switched and connected in a predetermined order to a data input terminal of another work RAM other than one of the three work RAMs from which data is read by the CPU. Equipped with a switch.

[0013]

For example, the waveform data reading path of the CPU is connected to the first work RAM via the first switch, and the waveform data stored in the work RAM is read by the CPU and the analog data is displayed on the screen of the display device. It is assumed that the waveform is being played. In this case, the second work R
The waveform data before the data currently being reproduced is stored in the AM, and the waveform data after the data currently being reproduced is stored in the third work RAM.

Here, for example, in the case of forward reproduction, when the final waveform data of the first work RAM is sent to the display device via the CPU, the data read path of the CPU is the third work by the first switch. The waveform data is read after being connected to the RAM. In this case, since the waveform data stored in the second work RAM is not used, this work RAM is switched and connected to the magnetic tape device by the second switch, and the waveform data stored in the third work RAM is compared to the waveform data stored in the third work RAM. N pieces of subsequent waveform data are acquired.

When the CPU finishes reading the waveform data stored in the third work RAM, the data reading path is switched to the second work RAM by the first switch and the data reading is finished. The work RAM is switched and connected to the magnetic tape device by the second switch to take in the next n waveform data. By repeating this operation, continuous forward waveform reproduction can be performed.

When the waveform is reproduced in the reverse direction, since the waveform data stored in the third work RAM is not used, this work RAM is switched to the magnetic tape device by the second switch and connected to the magnetic tape device. The waveform data n pieces before the n pieces of data stored in one work RAM are fetched. Thereafter, the first and second switches are selectively operated to sequentially read the waveform data from the work RAM and to load the waveform data into the work RAM that has been read, to thereby obtain a continuous waveform in the opposite direction as described above. Can be played.

[0017]

1 shows an embodiment of a waveform recording apparatus to which the present invention is applied. In FIG. 1, an input unit 1, a storage memory (DRAM) 2, a CPU 3, a display 5, a magnetic tape unit (MTU) 6 and the like are composed of substantially the same units as the conventional device of FIG.

In this embodiment, an operating section 4a having a different structure from the conventional apparatus and a new recording data fetching means 7 are provided.
Is provided. As shown in FIG. 2 (A), the operation unit 4a, for example, forward playback, backward playback, and operation stop (stop) keys, and forward playback waveforms as shown in FIG. 2 (B). A rotary knob that scrolls in the opposite direction is provided.

Further, as shown in FIG. 1, the recording data fetching means 7 is, for example, the first, second and third works R to which the waveform data recorded in the MTU 6 is loaded.
AMW1, W2, W3 and the first switch S for switching and connecting each work RAM to the data reading path of the CPU
a and a second switch Sb for switching and connecting each work RAM to the data transmission path of the MTU 6.

Referring again to FIG. 1, the input signal is sampled in the input section 1, and the digitally converted waveform data is once stored in the DRAM 2 under the control of the CPU 3.
Is taken into. When the required amount of waveform data is captured in the DRAM 2, the CPU 3 stops capturing the data, reads the captured waveform data, and transcribes it in the MTU 6. The operation up to this point is similar to that of the conventional device.

Next, the operation of reproducing the analog waveform of the input signal from the waveform data recorded in the MTU 6 will be described.
An example of forward reproduction will be described with reference to FIG. 3 as well. FIG. 3A shows an analog waveform of an input signal. Display 5 for clarity
For example, it is assumed that an analog waveform of one screen is reproduced with 15 pieces of waveform data.

As shown in FIG. 3B, the work RAMW
For example, the waveform data of Nos. 46 to 60 is fetched from MTU 6 in 1 and the data of Nos. 61 to 75 and Nos. 76 to 90 are fetched into the work RAMs W2 and W3, respectively. To do.

Here, for example, when the switch Sa is connected to the contact a2, the work R is pressed when the forward reproduction key is pressed.
The waveform data fetched by the AMW 2 is sequentially read by the CPU 3 from No. 61 and given to the display 5. An analog waveform of the input signal reproduced on the screen of the display 5 is shown in FIG. CPU3 is work RA
The speed at which data is sequentially read from M and reproduced as an analog waveform is set so that the operator of the apparatus can sufficiently follow the change in the waveform by visual observation.

When the waveform data read from the work RAM W2 by the CPU 3 reaches, for example, number 75, the switch Sa (FIG. 1) is switched to the contact a3 side by the control of the CPU 3. As a result, the waveform data of the 76th and subsequent waveforms (FIG. 3 (B)) stored in the work RAM W3 are stored in the CPU 3
Is read out and reproduced on the screen of the display 5. This reproduced waveform is shown in FIG.

Here, when the waveform data read out from the work RAM W2 by the CPU 3 reaches, for example, the number 66 in the middle,
The CPU 3 switches the switch Sb (FIG. 1) to the contact b1 side, and loads the waveform data Nos. 91 to 105 from the MTU 6 into the work RAM W1 in parallel with the reading of the waveform data from the work RAM W2. This state is shown in FIG.
Shown in.

Similarly, from the work RAM W3 to the CPU
The waveform data read by 3 starts at No. 76 and is in the middle of 8
When it reaches No. 1, the CPU 3 switches the switch Sb (FIG. 1) to the contact b2 side, and in parallel with the data reading from the work RAM W3, from MTU 6 to 106 to 120.
No. waveform data is loaded into the work RAM W2. This state is shown in FIG.

When the CPU 3 reads the 90th final waveform data fetched in the work RAMW3 and sends it to the display 5, it switches the switch Sa (FIG. 1) to the contact a1 side, and the 91st fetched from the MTU 6 into the work RAMW1. Waveform data from No. to 105 (Fig. 3 (C))
Is read out and given to the display 5 for waveform reproduction (FIG. 3 (D)).

When the waveform data reading from the work RAM W1 starts from number 91 and reaches, for example, the number 96 in the middle, the CPU 3 switches the switch Sb (FIG. 1) to the contact b3 side to read the waveform data from the work RAM W1. In parallel, the next waveform data Nos. 121 to 135 are loaded from the MTU 6 to the work RAM W3. Below, C
PU3 switches Sa and S until the stop key is pressed
b is controlled to be switched, and the next waveform data is sequentially loaded into and read from each work RAM.

FIG. 4 shows an example of backward reproduction of waveform data. That is, FIG. 4A corresponds to FIG.
4B shows the waveform of the input signal, and FIG. 4B shows the waveform data loaded in each work RAM. Now, for example, it is assumed that the waveform data is sequentially reproduced from the last waveform data No. 75 of the work RAM W2 in the direction of the first waveform data No. 61 backwards.

Here, for example, when the reverse playback key of the operation unit 4a is pressed, the 75th waveform data stored in the work RAM W2 will be followed by the 74th, 73rd, ...
.. is read by the CPU 3 and sent to the display 5 to reproduce the waveform on the screen. Figure 4 shows the playback waveform
It shows in (D).

When, for example, the read data of the CPU 3 reaches the number 66 during the waveform reproduction, the switch Sb is switched to the contact b3 side by the control of the CPU 3. As a result, the CPU 3 reads the waveform data from the work RAM W2 in parallel with reading the waveform data from the MTU 6 into the work RAM W3. This state is shown in FIG.

When the waveform data read from the work RAM W2 to the CPU 3 reaches the 61st leading data, the switch Sa is switched to the contact a1 side by the control of the CPU 3. As a result, the CPU 3 sequentially reads from the final waveform data No. 60 of the work RAM W1 toward the leading waveform data and gives it to the display 5 to reproduce the waveform. The state is shown in FIG.

When, for example, the waveform data read by the CPU 3 reaches the number 52 in the middle of the process, the switch Sb is switched to the contact b2 side by the control of the CPU 3. As a result, the CPU 3 loads the waveform data of Nos. 30 to 16 from the MTU 6 into the work RAM W2 in parallel with the reading of the waveform data of the work RAM W1. This state is shown in Figure 4.
It shows in (C).

Thereafter, the CPU 3 sequentially reads out the waveform data from one work RAM and supplies it to the display 5, while MTU is transferred to another work RAM in which the waveform reproduction is completed.
The waveform data before 6 is taken in, and the above operation is repeated until the analog waveform of the first data is reproduced on the screen of the display 5.

The above is an example of the case where the forward reproduction key or the reverse reproduction key of the operation unit 4a is pressed. The reproduced waveform on the screen of the display 5 moves to the left or right at a constant speed, but for scrolling. You can send the playback waveform at any speed by manually rotating the rotary knob.

[0036]

As described above in detail, in the present invention, the first work RA in which the waveform data of one screen of the reproduced input signal is captured on the screen of the display.
M, and second and third waveform data that is one screen before and one screen after the above are respectively captured.
The work RAM is provided, and the waveform data of each work RAM is automatically updated by designating forward reproduction or reverse reproduction.

Therefore, it is possible to easily perform the backward reproduction of the input signal waveform, which has been difficult in the prior art, and to provide a waveform recording device which is extremely easy to use.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of keys of an operation unit according to the present invention.

FIG. 3 is an explanatory diagram of a control operation of forward reproduction waveform data according to the present invention.

FIG. 4 is an explanatory diagram of a control operation of reverse reproduction waveform data according to the present invention.

FIG. 5 is a block diagram showing an electrical configuration of a conventional device.

[Explanation of symbols]

 1 Input Unit 2 Storage Memory (DRAM) 3 CPU 4a Operation Unit 5 Display 6 Magnetic Tape Unit (MTU) 7 Recorded Data Acquisition Means W1 Work RAM W2 Work RAM W3 Work RAM Sa Switch Sb Switch

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G01R 13/20 R 8203-2G G11B 5/02 J 7426-5D

Claims (5)

[Claims] 1. Waveform data obtained by sampling from an input signal is recorded in a memory and then transcribed and held in an external recording device, and the held waveform data is given to a display device to obtain an analog waveform of the input signal. In the waveform recording device for reproduction, the operation section having a reproduction direction setting key for reproducing the analog waveform of the input signal in the forward or reverse direction on the display screen of the display device, and the reproduction direction set in the operation section are displayed. In the case of the forward direction, the waveform data in the same direction as the passage of time is fetched from the external recording device, and in the case of the reproduction direction is in the reverse direction, the waveform data of the passage of time and the backward direction is fetched and stored respectively. The recording data capturing means and the operation of the recording data capturing means are controlled, and the captured forward or backward waveform data is captured. And a CPU for reading the data and sending the data to the display device to reproduce the waveform. 2. The external recording device includes the recording data fetching means, wherein the waveform data for one screen of the display device at an arbitrary time point and the waveform data for one screen each preceding and following the waveform data are respectively recorded. First, second and third work RAMs added from
A first switch for switching and connecting each data output terminal of the work RAM to a data reading path of the CPU, and a second switch for switching and connecting each data input terminal of the work RAM to a data sending path of the external recording device. The waveform recording apparatus according to claim 1, further comprising: 3. The recording data reading means,
The first switch is connected to the data output terminal of any one work RAM, and the waveform data for one screen of the work RAM is sequentially read by the CPU to reproduce the input signal waveform in the forward direction. In this case, the second switch is switched and connected to the data input terminal of the work RAM which stores the data for one screen before the waveform data at a predetermined point during the reading of the waveform data, and the work RA is connected.
2. The waveform recording apparatus according to claim 1, wherein the waveform recording apparatus is controlled so that waveform data of two screens after the waveform data being read from the external recording apparatus is added to M. 4. The recording data importing means,
The first switch is connected to the data output terminal of any one work RAM, and the waveform data for one screen of the work RAM is sequentially read by the CPU to reproduce the input signal waveform in the reverse direction. In this case, the second switch is switched and connected to the data input terminal of the work RAM which stores the data for one screen after the waveform data at a predetermined time point during the reading of the waveform data, and the work RA is connected.
2. The waveform recording device according to claim 1, wherein the waveform data is controlled so that waveform data of two screens before the waveform data being read from the external recording device is added to M. 5. The rotary knob according to claim 1, wherein the operation section is provided with a rotary knob that allows a waveform of an input signal reproduced on a screen of the display device to be scrolled at an arbitrary speed by a manual operation. Waveform recording device.