JPH0312865A - Data reader - Google Patents

Abstract

PURPOSE:To store only target data among plural pieces of data in a memory by extracting only target data among plural pieces of data which are read from a magnetic tape so as to store them in the memory by means of comparing the detection output of a position detection means with position data stored in a storage means. CONSTITUTION:The recording position of data, which is read from the magnetic tape 4 by the position detection means 11, on the magnetic tape 4 is detected and position data showing the recording position of target data stored in the memory 8 on the magnetic tape 4 is stored in the storage means 12. Target data is extracted from plural pieces of data which are read from the magnetic tape 4 and is stored in the memory 8 by comparing the detection output of the detection means 11 with position data stored in the storage means 12. Thus, target data can speedily and easily be extracted among plural pieces of data which are read from the magnetic tape 4 and it can be stored in the memory 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for recording on a magnetic tape in a predetermined format in units of n (n = 1.2.3, . . . ) inclined tracks. The present invention relates to a data reading device that reads out a plurality of pieces of data and stores only desired data among the plurality of pieces of data in a memory.

[Summary of the invention]

The present invention reads a plurality of data recorded on a magnetic tape in a predetermined format in units of n inclined trunks (n = 1.2.3, . . . ), and reads out a plurality of data recorded on a magnetic tape in a predetermined format. In a data reading device configured to store only desired data in a memory, a position detecting means detects the recording position on the magnetic tape of data read out from a magnetic tape, and stores desired data to be stored in the memory. Position data indicating the recording position of the data on the magnetic tape is stored in the storage means, and by comparing the detection output of the position detection means with the position data stored in the storage means, the plurality of data read from the magnetic tape are Since the desired data is extracted and stored in the memory, the desired data can be quickly and easily extracted from multiple data read from the magnetic tape and stored in the memory. This is what I did.

[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 out from the data stored in the magnetic tape and then subjected to arithmetic processing, when a large amount of data was recorded on the magnetic tape, the memory of the host computer quickly became full. Therefore, each time, the reproduction of the magnetic tape in the data recorder is stopped, the desired data is read out from among the plurality of data stored in the memory of the host computer (3), and after arithmetic processing is performed, the data recorder is restarted. This requires putting the magnetic tape into playback mode and storing the remaining playback data from the magnetic tape in the memory of the host computer, which is a complicated operation and may delay data arithmetic processing in the data recorder. .

In view of this point, the present invention provides n pieces (however, n=1, 2,
Data in which a plurality of data recorded on a magnetic tape in a predetermined format is read out in units of inclined tracks (3, ...), and only desired data from among the plurality of data is stored in memory. The present invention attempts to propose a reading device that can quickly and easily extract desired data from a plurality of pieces of data reproduced from a magnetic tape and store it in a memory.

[Means to solve the problem]

The present invention reads a plurality of data recorded on a magnetic tape (4) in a predetermined format in units of n inclined trunks (n = 1.2.3, . . . ), and In a data reading device configured to store only desired data among data in a memory (8), a position for detecting the recording position on the magnetic tape (4) of data read out from the magnetic tape (4). The position detecting means (11) comprises a detecting means (11) and a storing means (12) for storing position data indicating the recording position on the magnetic tape (4) of desired data to be stored in the memory (8). Desired data is selected from a plurality of data read from the magnetic tape by comparing the detection output with the position data stored in the storage means (12) and stored in the memory (8). It is something.

[Effect]

According to the present invention, by comparing the detection output of the position detecting means (11) and the position data stored in the storage means (12), from a plurality of data reproduced from the magnetic tape,
Desired data is extracted and stored in memory (8).

〔Example〕

The present invention will be described in detail below with reference to FIGS. 1 to 3. FIG. 1 shows the data reading device of this embodiment as a whole, and FIG. 2 is a flowchart on the actual side,
FIG. 3 is an explanatory diagram of the operation.

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,
The data recorder (3) that reproduces the data is a host computer that receives the reproduced data from the data recorder (2) and processes it.

First, the configuration of the host computer (3) will be explained. (
18) is the CPU (Central Processing Unit), which is connected to buses (data bus, control bus, address bus, etc.) (1
9), RAM (20), ROM (21)
, focus map memory (22) and data memory (23)
) are connected. Furthermore, these bitmap memories (
22) and data memory (23) are the above-mentioned RAM
(20), ROM In addition to using a semiconductor memory similar to (21), a part of RAM (20) may be used, or a floppy disk, hard disk, etc. as an auxiliary storage device may be used. good.

Measurement data from the measurement device (1) is supplied to a digital data recorder (2), and the measurement data is transferred to a magnetic tape (4) by one or more rotating magnetic heads (5).
) on the rotating magnetic head (reproducing magnetic head) (5) 1
Recording is performed so as to form a predetermined number of inclined tracks, ie, one to a plurality of inclined tracks, per rotation. Also, this magnetic tape (
The measurement data recorded in 4) is read out by a rotating magnetic head (reproducing magnetic head) (6).

Here, data reproduced from a predetermined number of inclined tracks per rotation by the rotating magnetic head (6) is
This data block is called block data, and as shown in FIG. 3A, a start signal is provided at the start end of the data block.

Such block data, for example, as shown in the third prisoner, consists of data 1 to data 10, each having an arbitrary data length, and the subsequent block data consists of data 1 to 10, each having an arbitrary data length, as shown in Fig. 3C. It is assumed that the block data consists of data 11 to data 20, and furthermore, any number of blocks of data sequentially following these data are also composed of data of arbitrary data lengths. In this case, the data length Ht of the block data is constant.

In this case, each data 1 to 10 forming the block data
．． Although the data length such as 11 to 20 is arbitrary, it is composed of one to a plurality of unit data having the same data length.

Measurement data read from the magnetic tape (4) by the rotating magnetic head (6) is supplied to a gate (7) and a data block starting edge detection circuit (9).

The measurement data that has passed through the gate (7) is written and stored at each address designated by the address counter (14) of the buffer memory (8). Further, the data read from this buffer memory (8) is transferred to the host computer (3) and stored in its data memory (23).
) is written and stored, and then read out and arithmetic processing is performed.

The data block start end detection circuit (9) detects the start end signal of the block data described above, and the position counter (11) is reset by the detection output.

This position counter (11) is connected to the clock generation circuit (10).
) counts the clock signals from The period of this clock signal is 1 to 10, 11 to 2 for each block data.
It is set to be equal to the reproduction cycle of the unit data that constitutes 0, etc.

Bitmap memory (22) of host computer (3)
) contains data to be processed in the host computer (3) out of the measurement data reproduced from the rotating magnetic head (6).
5), data of the recording position of the starting end of the first inclined track on the predetermined number of inclined tracks per rotation in (6), as shown in FIG. 3B of the block data of FIG. 3A,
Information such as the recording position of each unit data constituting data 1 and data 3 and the recording position of each unit data constituting data 12 and 13 as shown in Figure 3 of the block data in Figure 3C is remembered.

If the number of unit data constituting one block data is, for example, 1000, then 10 units of data are stored in the bitmap memory (23).
00 bit addresses are provided, and among the measurement data reproduced from the rotating magnetic head (6), data to be processed by the host computer (3), i.e., data 1, data 3, data 11
, ``1'' is stored in the bit address corresponding to each unit data constituting data 13, etc., and ``0'' is stored in the other bit addresses.Then, this bit map memory The content of (22) is CPU (
18) to the bitmap buffer memory (12) of the digital data recorder (2).

Then, the count output from the position counter (11) is supplied as an address signal to the bitmap buffer memory (12), thereby reading out the "1" and "0" stored in the 1000 focus addresses. The gate (7) is opened only when the read output is "1", and the measurement data read by the rotating magnetic head (6) is written and stored in the buffer memory (8).

(15) is a free address detection circuit of the buffer memory (8), which receives the start edge detection signal from the data block start edge detection circuit (9) and the bitmap buffer memory (1).
2) is supplied, and the number of output "1"s from the bitmap memory (12) is detected. ”, i.e. 100
When the value becomes 0 or less, a reproduction stop signal is generated, and this reproduction stop signal is supplied to the recording and reproduction control circuit (16) to stop reproduction by the rotating magnetic head (6).

In addition, the recording/reproducing control circuit (16) controls the magnetic tape (
Recording, reproduction, stopping, etc. by the rotary magnetic heads (5) and (6) for the magnetic head 4) are controlled. 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) generates an address signal by counting the clock signal from the clock signal generation circuit (13), which generates a clock signal only when an output "1" is obtained from the bitmap buffer memory (12). Based on this address signal, the data obtained through the gate (7) 1 2 of reproduced measurement data from the rotating magnetic head (6) is written into the buffer memory (8). Note that the storage capacity of this buffer memory (8) is several thousand to several thousand units of data.

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 subjected to arithmetic processing 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 bitmap buffer memory (12) of the data recorder (2) (step ST-
1).

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 5T-
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 reproduction start point, and is supplied to the address counter (14) as a reset signal, and the address counter (14) is counted.

When there is a start edge signal of a data block in the reproduction signal from the rotating magnetic head (6), this is detected by the start edge detection circuit (9) of the data processor, and the position counter (11) is reset or reset based on the detection signal. At the same time, the detection signal is sent to the buffer memory free address detection circuit (1
5). The address signal supplied from the position counter (11) to the bitmap buffer memory (12) causes the bitmap buffer memory (12) to be
) are read out sequentially, and the third
In the block data shown in Figure A, data 2 and data 3
In the block data shown in FIG. ) is opened, and among the reproduced measurement data, data 2, data 3, data 3 - data 12 and data 13, etc. are written and stored in the buffer memory (8) (step 5T-3, 4).

Also, buffer memory free address, detection circuit (15)
When an empty address in the buffer memory (8) is detected (step 5T-5), and the number of empty addresses in the buffer memory (8) reaches the maximum number of 1'' in one block data, that is, 1000 or less, Generates a playback stop signal, and this playback stop signal is transmitted to the recording and playback control circuit (16)
is supplied to stop the reproduction (step 5T).
-6).

Then, data 2 stored in the buffer memory (8),
Data 3, data 12, data 13, etc. are read out and data memory (23) of the host computer (3) is read out.
), and is processed by the CPU (18).

According to this data reading device, data having data lengths of Nl+N3 and Nu+N13, respectively, are extracted from a block data signal having a data length of Nt, as shown in FIGS. 3B and 3D, respectively, and are stored in the sofa memory (8). Since the data is stored in the buffer memory (8) and the memory (23), the storage efficiency of the buffer memory (8) and the memory (23) is dramatically improved, and as a result, desired data can be extracted without stopping playback in the data recorder (2) for a long time. host computer (3
) can be quickly performed on the desired data.

〔Effect of the invention〕

According to the present invention described above, n pieces (however, n=1.2.3
,...) data recorded on a magnetic tape in a predetermined format, and only desired data from among the multiple data is stored in memory. In the device,
detecting the recording position on the magnetic tape of the data read from the magnetic tape by the position detection means, and storing in the storage means position data indicating the recording position on the magnetic tape of the desired data to be stored in the memory; By comparing the detection output of the position detection means and the position data stored in the storage means, desired data is extracted from a plurality of data read from the magnetic tape and stored in the memory. Desired data can be quickly and easily extracted from a plurality of data read from a magnetic tape and stored in a 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, and FIG. 3 is a diagram for explaining its operation. (1) is the measuring device, (2) is the data recorder, (3) is the host 1-computer, (7) is the 'y'-to, (8) is the buffer memory, and (9) is the start end detection circuit of the data block. , (11) is a position counter, (12) is a bitmap buffer memory, (15) is a buffer memory free address detection circuit, (17) is a playback start determination circuit, (18) is a CPU, and (22) is a bitmap memory. It is.

Claims (1)

[Claims] A plurality of data recorded on a magnetic tape in a predetermined format is read out in units of n inclined tracks (n=1, 2, 3, . . . ), and A data reading device configured to store only desired data among data in a memory, comprising: a position detecting means for detecting a recording position on the magnetic tape of data read out from the magnetic tape; storage means for storing position data indicating the recording position of the desired data to be recorded on the magnetic tape; A data reading device characterized in that desired data is extracted from a plurality of data read from a magnetic tape and stored in the memory.