JPS592963B2 - Reproducing device for magnetically recorded information - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a magnetically recorded information reproducing device that sequentially reproduces (reads) a series of information recorded on endless circular magnetic tracks as positive and negative magnetization column information at predetermined magnetization intervals. In particular, the present invention relates to a reproducing apparatus for magnetically recorded information that can easily identify the starting end and type of continuous positive and negative magnetization array information.

Conventionally, an example of a device that records a series of information on an endless circular magnetic track as magnetization array information with a predetermined magnetization interval and reproduces this recorded information is shown in FIGS. 1 and 2. As shown in its structure, a magnetic pen with a built-in rotating magnetic head reads kanji codes and kanji patterns recorded as magnetization string information from circular magnetic tracks arranged in a matrix on the magnetic sheet at the bottom of the dial. There is a kanji input device that reads (reproduces) kanji.

In FIG. 1a, 1 is a dial, and 2 is a magnetic pen with a built-in rotating magnetic head. The dial plate 1 is partitioned into a matrix, and within each frame a different Chinese character is printed so as to make it appear as "blue", for example, as shown in FIG. A magnetic sheet 4 is sandwiched between the lower layer of the dial 1 and the substrate 3 in a sandwich-like manner, as shown in the cross-sectional view of FIG.
As shown by the broken line, a circular magnetic track 5 is formed corresponding to each partition frame, and on this circular magnetic track, the kanji code and kanji pattern information corresponding to the kanji in each partition frame are stored as positive and negative magnetization row information at a predetermined magnetization interval. is recorded as. on the other hand,
The structure of the magnetic pen 2 is shown in FIG.
A rotary magnetic head 2b that rotates at a rotation angle a is built-in, and an output terminal 2c of the rotary magnetic head 2b is connected to a read terminal 2d via an appropriate means. Therefore, in the kanji input device having such a configuration, when the magnetic pen is brought into contact with the partition frame of the dial plate 1 on which the required kanji is printed, the motor 2a rotates, thereby causing the circular magnetic track 5 to rotate. The kanji codes and kanji patterns stored in the kanji character are read out via the rotating magnetic head 2b. Therefore, with this device, a kanji code or kanji pattern corresponding to a desired kanji can be manually input into a computer or the like. By the way, in the case of this device, no matter where the rotation of the rotating magnetic head 2b starts on the circular magnetic track 5,
It is necessary to read the kanji code and kanji pattern information correctly, but when the information recorded on the circular magnetic track 5 is the kanji code or kanji pattern information, a control code with a specific bit pattern is used. It has become difficult to identify the starting part and type of Kanji code and Kanji pattern information. In other words, normally, the kanji pattern information is, for example, "
The kanji character ``山'' is expressed using 288 bits of information corresponding to 288 dots (16 x 18 dots). Therefore, this kanji pattern information varies depending on the type of kanji and the shape of the kanji actually used, and this 288-bit information is transferred to an endless circular magnetic track with positive and negative magnetization string information ( For example, if positive magnetization is recorded as logic "'1" and negative magnetization is associated with logic "0", it becomes impossible to identify which magnetized part is the start of the kanji pattern information. Therefore, a method of inserting a control code having a specific bit pattern into the starting end of the kanji pattern information to identify the starting end may be considered, but as mentioned above, the manner in which the kanji pattern information changes is Since the number of bit patterns is extremely large, it is extremely difficult to identify the bit pattern of the control code, and in order to identify one Kanji code or Kanji pattern information, the rotating magnetic head 2b must be rotated many times. There was a drawback that the starting end part had to be identified by comparative judgment on the computer side.In view of the above points, the present invention was made to solve such problems and eliminate such drawbacks. The main purpose is to provide a reproducing apparatus for magnetically recorded information that allows easy identification of the starting end and type of positive and negative magnetization array information recorded on an endless circular magnetic track.

Another purpose is to reproduce magnetically recorded information by making it possible to correctly identify and read out kanji codes and kanji pattern information recorded as magnetization sequence information on circular magnetic tracks by rotating the rotating magnetic head a maximum of two times. The goal is to provide equipment. Hereinafter, the configuration and the like will be explained in detail with reference to the illustrated embodiments.

First, before explaining the embodiments, the magnetization distribution of the magnetic track will be explained in order to facilitate understanding of the present invention.

FIG. 4 is an explanatory diagram showing an example of the magnetization distribution of a circular magnetic track.

In the same figure, the part indicated by M is recorded as magnetization sequence information in which logic ゜12 is positive magnetization (+Ms) and logic ゜07 is negative magnetization (-Ms), corresponding to the kanji code and kanji pattern information. This is the magnetization part, and the positive and negative magnetization row information is a predetermined magnetization interval τ. are kept and recorded. N is a non-magnetized part, and the interval τ1 of this non-magnetized part is the magnetization interval τ of positive and negative magnetization column information. It is set longer. Thus, the predetermined magnetization spacing τ. The magnetization spacing τ is included in the magnetization row information that is recorded while maintaining the magnetization spacing τ. By providing non-magnetized portions with longer intervals, it is possible to easily identify the starting end portion and type of magnetization array information simply by monitoring the time interval of readout output (sense output) from the rotating magnetic head. Note that in this figure, ST
SP indicates the starting end of the magnetization array information, and SP indicates the end of the magnetization array information. Further, arrow A indicates the direction of rotation of the magnetic portion M.
FIG. 5 is a block diagram showing an embodiment of the magnetically recorded information reproducing apparatus according to the present invention. In this case, the circular magnetic track contains a total of 304 bits of 16-bit Kanji code and 288-bit Kanji pattern information. It is assumed that the information is stored as continuous magnetization array information.

In FIG. 5, 10 inverts only the negative side signal of the sense output SS as shown in FIG. 6a obtained by rotating the rotating magnetic head on a circular magnetic track. This waveform shaping circuit 10 is a waveform shaping circuit that converts into a positive-side only signal and outputs the output as a read clock signal RC as shown in FIG. 6b.
In the sense output SS inputted to , the plus side corresponds to the information of the logic '17, and the minus side corresponds to the information of the logic SO77. Therefore, the read clock signal RC of the waveform shaping circuit 10 always becomes a pulse signal with a constant time interval t (corresponding to the magnetization interval τ) while the rotating magnetic head is rotating the magnetized portion. 11 is a pen switch that turns on when you press the magnetic pen against the dial;
1 is configured to detect up and down of the magnetic head.

Reference numeral 12 denotes a one-shot circuit which outputs a one-shot pulse of a predetermined pulse width in synchronization with the rise of the ON signal of the pen switch 11, and this one-shot circuit 12 and the pen switch 11 constitute a switch section.

This one-shot pulse is used as a reset signal RS for the flip-flop 16, which will be described later. 13
monitors the time interval of the read clock signal RC output from the waveform shaping circuit 10, and the time interval is the magnetization interval τ of the magnetization column information.

a clock oscillator 13a which is a time interval monitoring circuit which outputs its output as a non-magnetized portion detection signal ND when the time interval t corresponding to the clock signal ND is longer than the time interval t corresponding to the clock signal CP;
Then, each time an inverted read clock signal C obtained by inverting the read clock signal RC by the inverter 13b is input, an appropriate initial ID is initially loaded, the clock signal CP is counted, and its carry output is transferred to the non-magnetized portion. The counter 13c outputs the detection signal ND. In this case, the initial value 1D initially loaded into the counter 13c is such that the counter 13c is, for example, a 4-bit binary counter, the time required for rotation of the non-magnetized portion N is Nt, and the period of the clock signal CP is T. , then ID and NtNt are T.

The value divided by - and the addition value [D+TONt -] becomes 16 (24) or more, and the counter TO Set so that carry output is output from l3c.

In other words, each time the read clock signal RC is generated, the initial value is 1D.
, and if one or more clock pulses CP are counted after this initial loading, the rotational movement of the rotating magnetic head will change to the non-magnetized portion N.
It means that the position has been reached.

Therefore, if the read clock signal RC continues to be input to this counter 13c at a constant cycle, the counter 13c will always be initially loaded to the initial value 1D before its count value overflows, so the carry output will be output from the rotating magnetic head. is output only when it reaches the position of the non-magnetized portion N. Therefore, by doing this, it is possible to increase the permissible range of period fluctuation of the read clock signal RC. Next, 14 counts the number of read clock signals RC after the non-magnetized portion detection signal ND is output, and when the count reaches 304, the output is used to finish reading all of the magnetization row information in order from the starting end. A magnetization row information counter that outputs a reading end signal RE indicating a non-magnetized portion detection signal N.
After an appropriate initial value 1D2 is loaded by the inverted non-magnetized portion detection signal xiang which is obtained by inverting D by the inverter 14a, the read clock signal RC is counted and its carry output is output as the read end signal RE.
It is composed of a 12-bit binary counter 14b, and the initial value 1D2 in this case is determined by taking into account the number of bits of the counter 14b actually used and the number of bits of magnetization column information.

For example, if the counter 14b is a 512-bit binary counter, the initial value 1D2 is selected to be 1D2-512-304. In this way, even if the number of bits of the magnetization string information is irregular, the end of the magnetization string information can be detected with one counter element without using a decoder circuit or the like. Next, 15 is a diode 15a and sense output SS
Remove the negative side of and convert the positive side sense output to logic′
This is a shift register that temporarily stores information of 1'' while sequentially shifting it in response to a read clock signal RC.
It has a storage capacity of 100 bits.

16 is a flip-flop which is set at the trailing edge of the read end signal RE and is output from the one-shot circuit 12 or set by the set signal RS; 17 is an inverted set output (Q) of the flip-flop and a read end signal R;
18 is an AND gate that takes the AND of E and outputs the AND output as a latch enable signal LE to a latch circuit 18, which will be described later. A latch circuit that latches the contents, 19 a parallel-to-serial converter (PS converter) that outputs 16-bit parallel information of the latch information of the latch circuit 18 as a corresponding serial Kanji code, 20 a latch of the latch circuit 18 A parallel-to-serial converter (PS) outputs 288 bits of parallel information as corresponding serial Kanji pattern information.
converter).

The operation of the readout circuit configured as above will be explained using the time chart shown in FIG.

First, when the rotating magnetic head starts rotating sequentially from, for example, the 301st bit magnetized part, the sense output SS input to the waveform shaping circuit 10 is
Starting from the 1st bit, 302, 303...
The signal corresponds to the magnetized portion of the 304th bit, and this sense output is converted by the waveform shaping circuit 10 into a positive-side only signal as shown in FIG. This read clock signal RC is input to the time interval monitoring circuit 13, and the time interval is checked based on the clock pulse Cp.
However, the read clock signal R up to the 304th bit
Since C is input at a predetermined period, the counter 13c does not reach the point where its count value overflows, and therefore does not output the non-magnetized portion detection signal ND. However, when the rotating magnetic head reaches the position of the non-magnetized portion N, the counter 13
The count value of c overflows, and a non-magnetized portion detection signal as shown in FIG. 7d is output. Then, by this non-magnetized portion detection signal ND, the magnetization column information counter 1
4 is initially loaded with "208" as the initial value 1D2, as the count value is shown in FIG. 7e.

Then, when the rotational position of the rotating magnetic head passes the non-magnetized portion N and reaches the position of the first bit of the magnetized portion N, the count value of the magnetization column information counter 14 is changed by the read clock signal RC of the first bit. Count up [2
09". Thereafter, the count value of this magnetization column information counter 14 is sequentially counted up to 210, 211, . Then, the magnetization column information counter 14 outputs a reading end signal RE as shown in FIG. 7f. Then, when the rotational position of the rotating magnetic head reaches the position of the non-magnetized portion N again and the non-magnetized portion detection signal xi is outputted from the counter 13c again, the count value of the magnetization row information counter 14 becomes “
0'', and the flip-flop 16 is set at the trailing edge of the read signal RE at this time (FIG. 7g).

As a result, the output of the AND gate 17, that is, the latch enable signal LE becomes as shown in FIG. The obtained magnetization column information is latched in the latch circuit 18. In this case, the shift register 15 sequentially temporarily stores the magnetization array information from the position where the rotating magnetic head starts rotating. However, since the rotating position of the rotating magnetic head starts from a position in the middle of the magnetized portion M, As a result, the magnetization column information 303 bits before the magnetization column information counter 14 outputs the read end signal RE, that is, the information of the first bit, remains in the final stage of this shift register. Therefore, when the temporary storage contents of the shift register 15 are latched into the latch circuit 18 at the timing of the trailing edge of the latch enable signal LE, the magnetization column information from the 1st bit to the 304th bit is stored in the latch circuit 18 in an orderly manner. They will be retained as if they were arranged in order. In this case, the trailing edge of the latch enable signal LE is connected to the read end signal R after the flip-flop 16 is reset by the reset signal RS shown in FIG.
After being set by E, it will appear only once unless the magnetic pen is removed from the dial and brought into contact with the dial again, so it is difficult to determine how many times the rotating magnetic head will move while the magnetic pen is in contact with the dial. Even if it rotates, the latch circuit 18 has a 1
The magnetization string information from the 1st bit to the 304th bit is latched only once, and then converted into serial kanji code and kanji pattern information by the PS converters 19 and 20, and input into a computer, etc. It turns out. Therefore, according to the readout circuit of this embodiment, the magnetization array information recorded on the circular magnetic track only once can be read out in an orderly manner from the starting end to the ending end with one pen touch. In addition, since the number of bits of the sense output SS is counted and the latch circuit 18 is latched only when the number of bits reaches a predetermined number, only accurate magnetization array information can be input into a computer, etc. I can do it. Furthermore, since the sense output SS from the circular magnetic track is used as a clock for counting the number of bits of magnetization array information or as a clock for taking in information, malfunctions due to fluctuations in the rotational speed of the rotating magnetic head can be prevented. There are advantages such as In this embodiment, the magnetization array information is 304 bits, but it goes without saying that this number of bits may be arbitrary.

Although this embodiment has been described as a circuit for reading information from a circular magnetic track of a magnetic sheet, it is also possible to read information from other magnetic recording media, etc., as long as positive and negative magnetization array information is recorded in an endless manner. It can also be applied to readout circuits. Further, in this embodiment, a readout circuit was explained in which the non-magnetized portion of the circular magnetic track was provided at only one location, but as shown in FIG. It is also possible to apply the present invention to a case where kanji codes, kanji pattern information, and additional information are recorded in association with these non-magnetized portions T1, T2, and T3, respectively.

FIG. 9 is a block diagram showing an embodiment of the readout circuit in such a case, and the same parts as in FIG. 5 are denoted by the same symbols, and the explanation thereof will be omitted.

In FIG. 9, numeral 21 is a non-magnetized portion time interval determination circuit that checks the time interval from when the non-magnetized portion detection signal ND is output until the read clock signal RC of the subsequent magnetized portion is output. , the clock pulse Tx output from the clock oscillator 22 is used as a reference clock. If the time interval of the non-magnetized portion is T1 time corresponding to the Kanji pattern information, an enable signal E1 for taking in the Kanji pattern information into the shift register 23 is output. Furthermore, at time T2, an enable signal E2 for taking additional information into the shift register 24 is output. Also, if it is T3 time,
An enable signal E3 for loading the kanji code into the shift register 25 is output. By doing this, the kanji pattern information, additional information, and kanji code information will be temporarily stored in each shift register as information arranged in order starting from the starting edge, so these pieces of information can be used alone and other times. This is extremely advantageous when transmitting to other devices. As explained above, according to the present invention, the magnetization array information recorded on the circular magnetic track is arranged in order from the starting end by one pen touch, and at worst by only two rotations of the rotating magnetic head. It can be read out accurately as

Further, since the rotating magnetic head rotates only twice at worst, the read cycle can be shortened, which has the excellent effect of significantly increasing the information processing speed.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams for explaining the configuration and operation of a kanji input device as an example of a conventional magnetically recorded information reproducing device, and Figure 4 is an explanatory diagram showing an example of the magnetization distribution of a circular magnetic track. , FIG. 5 is a block diagram showing an embodiment of the magnetically recorded information reproducing apparatus according to the present invention, and FIGS.
The figure is a time chart for explaining the operation of FIG. 5, and FIGS. 8 and 9 are explanatory diagrams and block diagrams showing other embodiments of the present invention. 1...Dial board, 2...Magnetic pen, 26
...Rotating magnetic head, 4...Magnetic sheet, 5...Circular magnetic track, M...
Magnetized part, N...Non-magnetized part, 10...
・Waveform shaping circuit, 11...Pen switch, 13
......Time interval monitoring circuit, 14...Magnetization column information counter, 15...Shift register, 2
1...Non-magnetized portion time interval discrimination circuit.

Claims (1)

[Claims] 1. When recording a series of information as positive and negative magnetization array information with a predetermined magnetization interval on an endless magnetic track, a non-magnetized portion longer than the magnetization interval of the magnetization array information is provided at the starting end of the positive and negative magnetization array information. In a device that reads desired information from a provided endless magnetic track, a clock oscillator that outputs a clock signal with a cycle shorter than the cycle of the read signal of the magnetization column and a clock oscillator that outputs a clock signal with a cycle shorter than the cycle of the read signal of the magnetization column and the read signal itself are used as the clock to generate an initial clock every time the read signal is input. A time interval monitoring circuit consisting of a counter that loads a value, counts the signal from the clock oscillator, and outputs a carry signal as a non-magnetized portion detection signal when overflowing, and a non-magnetized portion detection output from this time interval monitoring circuit. a magnetization column information counter comprising a counter that counts a read signal after loading an initial value by a signal and outputs a carry signal as a read end signal when an overflow occurs;
The switch part consists of a switch that detects up/down of the magnetic head, a one-shot circuit that outputs a one-shot pulse of a predetermined pulse width in synchronization with the rise of the on signal from this switch, and a switch that outputs a one-shot pulse with a predetermined pulse width. a shift register that stores as a clock, a flip-flop circuit that is set at the trailing edge of the read end signal and reset by the signal from the one-shot circuit, and inputs the inverted set output of this flip-flop circuit and the read end signal. 1. An apparatus for reproducing magnetically recorded information, comprising: an AND circuit; and a latch circuit that uses a signal from the AND circuit as a latch enable signal to latch the contents of the shift register.