JPH0317865A - Data reader - Google Patents

Abstract

PURPOSE:To rapidly and easily extract a desired data and to store it by storing it in a memory when a data discriminating code detected from a data being read out coincides with a discriminating data of the desired data to be stored in the memory. CONSTITUTION:A data list signal stored in a data list memory 22 of a host computer 3 is transferred to a coincidence detecting circuit 25 of a digital data recorder 2. A measuring data recorded on a magnetic tape 4 is reproduced by a magnetic head 6, and whether or not the figures of X and Y of ten decimal place and one decimal place respectively of a discriminating data ID of a unit data therein is coincident with their conditional expressions of 1<=X<=3 and 5<=Y<=7 stored in the memory 22 is discriminated by the circuit 25. Upon coincidence, a coincidence signal is outputted, and a clock signal is inputted to an address counter 14 from a clock generating circuit 13 by opening a gate 7, and then only unit data having data discriminating codes of 15-37 is stored in a buffer memory 8 in an address specified by an address signal to be outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention reads a plurality of data to which data identification codes are attached from a magnetic tape, and stores only desired data from the plurality of data in a memory. The present invention relates to a data reading device.

[Summary of the invention]

The present invention provides a data reading device that reads out a plurality of pieces of data to which data identification codes are attached from a magnetic tape, and stores only desired data among the plurality of pieces of data in a memory. detect the data identification code of the data that is stored in the memory, determine whether the detected data identification code matches the data identification code of the desired data to be stored in the memory, and based on the result of the determination, select the desired data. By storing this data in the memory, desired data can be quickly and easily extracted from a plurality of data read from the magnetic tape and stored in the memory.

[Conventional technology]

A conventional data reading device will be explained below.
Conventionally, measurement data obtained from a measuring device is recorded on a magnetic tape using a data recorder, and some of the data recorded on the magnetic tape is selected for analysis, etc. There are cases where the host computer performs calculation processing. At this time, conventionally, a data recorder reads out all the data recorded on the magnetic tape, transfers it directly to the host computer and stores it in its memory, and the host computer stores it in its memory. Desired data is selected and read out of the available data and subjected to arithmetic processing.

[Problem to be solved by the invention]

In conventional data reading devices, data recorded on the magnetic tape is read out by a data recorder, transferred directly to a host computer, stored in its memory, and then stored in its memory by the host computer. Since the desired data was selected and read from the existing data and subjected to arithmetic processing, if there was a large amount of data recorded on the magnetic tape, the memory of the host computer would quickly become full. Therefore, each time, the data recorder stops playing the magnetic tape, reads out the desired data from among the multiple data stored in the memory of the host computer, performs arithmetic processing, and then returns the data recorder to the playback state. Then, the remaining reproduced data from the magnetic tape must be stored in the memory of the host computer, which makes the operation complicated and may delay the data arithmetic processing in the data recorder.

In view of the above, the present invention provides a data reading device that reads a plurality of pieces of data attached with data identification codes from a magnetic tape and stores only desired data among the plurality of pieces of data in a memory. The purpose of this invention is to propose a system that can quickly and easily extract desired data from a plurality of reproduced data and store it in a memory.

[Means to solve the problem]

The present invention provides a data reading device that reads a plurality of pieces of data attached with a data identification code from a magnetic tape (4) and stores only desired data among the plurality of pieces of data in a memory (8). detection means (24) for detecting the data identification code of data being read from the tape (4); and a determining means (25) for determining whether or not it matches the data identification code of the data, the determining means (25)
) The desired data is stored in the memory (8) based on the determination output.

[Effect]

According to the present invention, the data identification code of data being read from the magnetic tape (4) is detected, and
It is determined whether the detected data identification code matches the data identification code of the desired data to be stored in the memory (8), and the desired data is stored in the memory (8) based on the determination result. .

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. Fig. 1 shows the data reading device of this embodiment as a whole, Fig. 2 shows a flowchart of the embodiment, Fig. 3 shows the formant of unit data, and Fig. 4 explains the operation of the embodiment. It is a diagram.

In FIG. 1, (1) is a measuring device, (2) is the measuring device that records measurement data from this measuring device (1) on a magnetic tape,
There is also a data recorder for reproducing the data, and (3) a host computer for receiving the reproduced data from the data recorder (2) and processing it.

First, the structure of the host computer (3) will be explained.
(18) is the CPU (central processing unit), which is connected to the bus (
data path, control bus, address bus, etc.')
(19), R A M (20), R O M
(21), a data list memory (22) and a data memory (23) are connected. Note that these data list memory (22) and data memory (23) use semiconductor memories similar to those of R A M (20) and R O M (21) described above, as well as those of R A M (20). You may use a part of it, or you may use a floppy disk, hard disk, etc. as an auxiliary storage device.

Measurement data from the measuring device (1) is fed to a digital data recorder (2), where the measurement data is transferred to a magnetic tape (4) by means of its one or more rotating magnetic hands (5).
) on the rotating magnetic head (reproducing magnetic head) (5) 1
A predetermined number of inclined tracks, ie, one or more inclined tracks, are recorded for each rotation. Also, this magnetic tape (
The measurement data recorded on the magnetic tape (4) is read out by a rotating magnetic head (reproduction magnetic head) (6).The measurement data recorded on this magnetic tape (4) is a unit of fixed (or indefinite) data length. It is constructed from multiple sequences of data. As shown in FIG. 3, this unit data consists of an initial code IC, a data identification code ID, data DATA, and a terminal code TC, and the data identification code [D is, for example, a two-digit decimal number, that is, OO~99
Each digit of the decimal number is converted into a binary code, and the codes are different from each other. Here, to simplify the explanation, we will consider data identification codes IDs from 00 to 39 as shown in FIG. 4A, and we will consider 40 unit data having these data identification codes OO to 39. .

Measurement data read from the magnetic tape (4) by the rotating magnetic head (6) is supplied to the gate (7) and the data identification code reading circuit (24). Gate(
The measurement data passed through step 7) is written and stored at each address specified by the address counter (14) of the expansion memory (8). Further, the data read from this buffer memory (8) is transferred to the host computer (3), written and stored in the data memory (23), and then read out and subjected to arithmetic processing. It will be done. The data list memory (22) of the host computer (3) stores the data of the host computer (3) among the measurement data reproduced from the rotating magnetic head (6).
A data identification code list of data to be processed is stored in , and here, when the numbers of 10's and 1's digits of the above-mentioned data identification code are X and Y, respectively, the following 2 are stored. Two conditional expressions 1≦X≦3...
...(1) 5≦Y≦7 (2) is stored.

(25) is a coincidence detection circuit, where the rotating magnetic head (6
> The measurement data, that is, the series of unit data reproduced from the inclined track of the magnetic tape (4), has its data identification code ID read by the data identification code reading circuit (24), and the read data Identification code ID D0)XSY is the data list memory (
It is determined whether conditional expressions (1) and (2) stored in 22) are satisfied, and only when they are satisfied, a match signal "1" is output and supplied to the gate (7). At the same time, it is supplied to the Kurofuku operation circuit (13), and only when a coincidence signal "1" is output, a clock signal is generated, and this is sent to the bathophore memory (8). is supplied to the address counter (14) for counting. (15) is an empty address detection circuit of the buffer memory (8), which is supplied with the counting output from the address counter (14), and detects the address counter ( 14)
is subtracted, and when the subtraction result is less than a predetermined number, a reproduction stop signal is generated, and this reproduction stop signal is supplied to the recording and reproduction control circuit (16), and the rotating magnetic head (6) playback will be stopped. In addition, the recording/reproducing control circuit (16) controls the magnetic tape (
Recording, reproduction, stopping, etc., are controlled by the rotating magnetic fields (5) and (6) relative to (4). Then, the reproduction mode signal from this control circuit (16) is transmitted to the reproduction start determination circuit (16).
7), the playback start determination circuit (1
The address counter (14) is reset by the reproduction start signal generated from 7).

The address counter (14) receives a clock signal from the clock generation circuit (13) which generates a clock signal only when a coincidence detection output "1" is obtained from the coincidence detection circuit (25). An address signal is generated by counting the lock signals, and based on this address signal, the data obtained through the gate (7) of the reproduced measurement data from the rotating magnetic head (6) is written into the buffer memory (8). ．． The measurement data stored in this buffer memory (8) will later be stored in the data memory (3) of the host computer (3).
23) and then processed by the CPU (18). Next, the operation of the data reading device shown in FIG. 1 will be explained with reference to the flowchart shown in FIG. Under the control of the host computer (3), the host computer (3)
) is transferred to the coincidence detection circuit (25) of the data recorder (2) (step ST-1). Note that the coincidence detection circuit (25) may include a built-in memory for storing the transferred data list.

Operate the playback button of the digital data recorder (2) to start playback of the measurement data recorded on the magnetic tape (4) by the rotating magnetic head (6) (step ST-
2). As a result, a playback mode signal is generated from the recording/playback control circuit (16), and this signal is sent to the playback start determination circuit (17).
As a result, a reproduction start pulse is generated at the start of reproduction, and is supplied to the address counter (l4) as a reset signal, and the address counter (l4) is reset. The measurement data reproduced from the rotating magnetic hand (6), that is, the data identification data IDs X and Y of each unit data thereof, correspond to the data list signal from the data list memory (22), that is, the above conditional expression (1). ) , (2
) is satisfied or not in the coincidence detection circuit (25) (step ST-3), and when a coincidence signal "1" is output, the gate (7) is opened during that time and the clock discipline circuit ( A cross signal is outputted from 13) and supplied to the address counter (14), and the unit data shown in FIG. As shown in B, 15, 16, 17, 25, 26, 27,
Only unit data having data identification codes IDs of 35, 36, and 37 pass through the gate (7) and are written and stored in the puffer memory (8) (step ST-4).
).

The buffer memory empty address detection circuit (15) detects the empty address of the buffer memory (8), that is, the number of units of data that can be stored, and if the number is greater than a predetermined value, steps ST-3 and ST-4 are performed. When the operation is repeated and the value is below a predetermined value, the free address detection circuit (15
) generates a reproduction stop signal, which is supplied to the recording and reproduction control circuit (16) to stop reproduction of the measurement data by the rotating magnetic head (6) (step ST-6). Then, the data stored in the buffer memory (8) (see FIG. 4B) is written and stored in the data memory (23) of the host computer (3), and the CPU (18)
The calculation is processed by.

According to this data reading device, the magnetic tape (4)
By determining the data identification code among the plurality of data read from the buffer memory (8), only a selected part of the data is stored in the buffer memory (8). The storage efficiency for (23) has been dramatically improved, and as a result, the desired data can be extracted without stopping playback in the data recorder (2) for a long time. Data calculation processing can be performed quickly.

〔Effect of the invention〕

According to the present invention described above, in a data reading device that reads a plurality of data attached with a data identification code from a magnetic tape and stores only desired data among the plurality of data in a memory, Detecting the data classification code of the data being read, determining whether the detected data identification code matches the data identification code of the desired data to be stored in the memory, and performing the determination. Since the desired data is stored in the memory based on the results, the desired data can be quickly and easily extracted from a plurality of data read from the magnetic tape and stored in the memory.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart of the embodiment, FIG. 3 is a diagram showing a data format, and FIG. 4 is a diagram for explaining its operation. (1) is the measurement device, (2) is the data recorder, (3) is the host computer, (7) is the gate, (8) is the buffer memory, (15) is the buffer memory free address detection circuit, (24) is the data identification Code reading circuit, (2
5) is a coincidence detection circuit.

Claims (1)

[Scope of Claims] A data reading device that reads a plurality of data attached with data identification codes from a magnetic tape, and stores only desired data among the plurality of data in a memory, from the magnetic tape. a detection means for detecting a data identification code of the data being read; and a detection means for determining whether the data identification code detected by the detection means matches the data identification code of the desired data to be stored in the memory. A data reading device comprising: a determining means for determining, and storing the desired data in the memory based on a determined output of the determining means.