JPH0128429B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a barcode reading control device.

2. Description of the Related Art In recent years, barcode input devices have been developed that write digital information using a barcode on a card or the like by printing or the like, and read this digital information with a barcode reader to input pitch information into, for example, an electronic musical instrument.

By the way, with conventional barcode input devices, the card is placed on a desk or the like and the barcode is traced and scanned with a barcode reader, but if there is a dirt stain near the end of a series of barcodes, This blemish could be read by mistake, causing an error.

In addition, when there is a large amount of information, the barcode is printed over multiple lines on the card, but in such cases, the information content on each line is different, resulting in uneven line lengths, which creates an unattractive appearance. It was hot. Furthermore, it is necessary to provide a margin (hereinafter referred to as margin space) at the end of each line, which has the disadvantage that the amount of information that can be stored on one card is reduced accordingly.

This invention was made against the background of the above-mentioned circumstances, and its purpose is to provide a read signal that is output from a barcode reader until a predetermined period of time has elapsed after reading the necessary information. An object of the present invention is to provide a barcode reading control device which prohibits the input of barcodes and thereby eliminates the various drawbacks of the above-mentioned conventional methods.

Various embodiments will be described below with reference to the drawings.
FIG. 1 is a circuit diagram of the first embodiment. On the card (for example, see Figure 3), digital information with predetermined contents is written as a series of barcodes by printing or other methods, and the read signal output from a barcode reader (not shown) is applied to a CPU (central processing unit) 2 for performing input processing via an AND gate 1, and is also applied to an AND gate 3. The read signal input to the CPU 2 is converted into digital information corresponding to each barcode, and then necessary information is further sent to a RAM (random access memory, not shown) and stored therein.

To explain the barcodes on the card with reference to Figure 3, one set of barcodes consists of a series of data codes consisting of multiple bars, and the last data code (1 in Figure 3a). The end code specified by the 4-bit all “1” data (here, the widest and narrowest bars represent “1” and “0”, respectively, regardless of whether they are black or white) provided next to the bar (shown). (indicated by 2 in FIG. 3a), continuation bit, and checksum data (indicated by 3 and 4, respectively in FIG. 3a). In the case of this embodiment, this set of barcodes corresponds to one line, the continuation bit is data indicating the presence or absence of the next line, and the checksum is data for checking.

When the CPU 2 detects a signal corresponding to the end code in the read signal given from the barcode reader, it outputs a signal BE of "1" and supplies it to the AND gate 3 to open the AND gate 3.
Therefore, the AND gate 3 outputs three "1" level signals based on the continuation bit and checksum shown in FIG. It is structured as follows. Note that since this continuation bit is 1-bit data and the checksum is 4-bit data, three "1" signals are always obtained. The carry output of ternary counter 5 is the CPU
2 and the CR differentiation circuit 6. In response to this, the CPU 2 stops outputting the signal BE, and the output pulse of the CR differentiating circuit 6 is applied to each reset input terminal R of the counter 7 and SR type flip-flop 8, thereby setting each of them in a reset state. The counter 7 is a counter provided to count the clock CP and time a predetermined period of time, for example, one second. The carry output is applied to the set input terminal S of the flip-flop 8, and the set output of the flip-flop 8 is applied to the AND gate 1 as a gate control signal.

Next, the operation of the above embodiment will be explained. When reading a bar code from a card, the flip-flop 8 is in the set state, and therefore the AND gate 1 is open. Therefore, the read signal is given to the CPU 2 and the AND gate 3.
Necessary digital information obtained by input processing the read signal is further transferred to the RAM via the CPU 2. Also, while reading a series of data codes out of a set of barcodes, the signal BE is "0".
ANDGATE 3 is open.

Next, when the end code is read, the CPU 2 outputs the signal BE as "1", and the AND gate 3
will be developed from now on. Then, when three "1" level signals from the continuation bit and checksum are read, the "1" signal is outputted from the AND gate 3, supplied to the ternary counter 5 via the CR differentiation circuit 4, and counted. And the count value is “1”,
When the carry signal is output at the timing when the value changes to "2" and "0" and the value becomes "0", the carry signal is given to the counter 7 and flip-flop 8 through the CR differentiation circuit 6, respectively, and resets each of them. shall be. Thereafter, the counter 7 starts counting time, for example, for one second, and during this time, the AND gate 1 is closed, so that even if the barcode reader reads any information, it is not input to the CPU 2 and is ignored. . When one second has elapsed, a carry signal is output from the counter 7, and the flip-flop 8 is set. Therefore, the set output (“1”) opens AND gate 1 from now on,
It becomes possible to read the next line or the barcode of another card. Here, the value of 1 second was obtained by taking into consideration the time from the end of the barcode to the start of the next line when scanning with the barcode reader.

Next, a second embodiment will be described with reference to FIG.
Note that circuits having the same functions as those in FIG. 1 are given the same reference numerals, and their explanations will be omitted.

That is, the output of the AND gate 1 is further applied to the reset input terminal R of the SR type flip-flop 13 via an inverter 11 and a CR differentiation circuit 12. The signal BE is applied to the set input terminal S of the flip-flop 13 via the CR differentiation circuit 14. The set output is given to the AND gate 15 as a gate control signal.
A clock CP is applied to this AND gate 15, and the clock CP output from the AND gate 15 is input to a counter 16 and counted.

The clock CP is also applied to an AND gate 18 via a 1/N frequency divider 17. Further, the carry output of the ternary counter 5 is applied to the set input terminal S of the flip-flop 19, and its set output is applied to the AND gate 18 as a gate control signal. The 1/N frequency-divided signal output from the AND gate 18 is applied to the counter 20 and counted. Further, each count output of the counters 16 and 20 is both sent to the matching circuit 2.
1 to detect a match, and the match output is applied to the set input terminal of the SR flip-flop 22 and the flip-flop 19.
is applied to the reset input terminal R of. The set output of the flip-flop 22 is used as a gate control signal for the AND gate 1. In addition,
The counter 16 is reset by the signal BE passed through the differentiating circuit 14, and the counter 20 and flip-flop 22 are both reset by the output of the differentiating circuit 6.

Next, the operation of the second embodiment will be explained. When reading a barcode from a card, the flip-flop 22 is in a set state and therefore the AND gate 1 is open. Therefore, the read signal is sent to CPU2, AND gate 3, and inverter 1.
1 are given respectively. The necessary digital information obtained by inputting and processing the read signal is
It is further sent from CPU2 to RAM. Also, during this time, the signal BE is "0" and the AND gate 3 is closed.

Next, when the end code is read, the CPU 2 outputs a signal BE of "1" and opens the AND gate 3 thereafter. Further, the flip-flop 13 is set to a set state by the output of the CR differentiation circuit 14, and at the same time, the counter 16 is set to a reset state. Then, an output is generated from the inverter 11 in synchronization with the fall of the continuation bit (3 in FIG. 3a) signal. and C.R.
The flip-flop 13 is reset via the differentiating circuit 12. As a result, the AND gate 15 is closed and the counting operation of the counter 16 is stopped. That is, the counter 16 counts a count value corresponding to the time when the continuation bit is scanned. Therefore, if the scanning speed of the barcode reader is fast, the counted value will be small, and conversely, if the scanning speed of the barcode reader is slow, the counted value will be large.

On the other hand, three "1" level signals from the continuation bit and checksum are input to the ternary counter 5 and counted through the AND gate 3 and the CR differentiation circuit 4. When the count value becomes "0", a carry signal is output, flip-flop 19 is set, and counter 20 and flip-flop 22 are simultaneously reset by the output of CR differentiation circuit 6. Therefore, from now on, input of a read signal from the barcode reader via the ungate 1 is prohibited.

On the other hand, after flip-flop 19 is set, 1/
The clock CP whose frequency is divided by N is the AND gate 18.
The signal is applied to the counter 20 through the circuit and counted. Then, the counting output is sent to the counter 1 in the coincidence circuit 21.
6 is compared, and when the two match, a match signal is output, flip-flop 22 is set, and in response, AND gate 1 is opened again.
Ready to read barcodes on the next line or other cards.

As explained above, in the case of this second embodiment,
After reading the necessary information, the input of a read signal from the barcode reader is prohibited for a time corresponding to the scanning speed of the barcode reader. That is, the faster the scanning speed of the barcode reader is, the shorter the input prohibition time is, and conversely, the slower the scanning speed is, the longer the input prohibition time is.

Note that the length of time during which input of the read signal from the barcode reader is prohibited is not limited to those of the various embodiments described above, and is arbitrary.

Further, the form of the barcode is not limited to the above embodiment, and the format of the information may be changed as appropriate.

As explained above, in this invention, after reading a series of data codes in one set of barcodes out of a group of barcodes, the barcode is read until a predetermined time elapses by detecting an end code. Since we have provided a barcode reading control device that prohibits the input of reading signals from the reader and prepares for reading the next set of barcodes, the barcode can be read after reading the necessary data codes in the barcode. Even if the reader accidentally protrudes from the card and reads a smudge caused by dust on the desk, or a smudge on the card, this error data is not inputted, so the advantage is that errors can be reliably prevented from occurring. There is. Also, if the barcode display is provided on multiple lines on one card,
Even if a dummy code is provided at the end of each line to make each line the same length, this dummy code will not be input as data, which has the advantage of improving the appearance of the card. Even if the margin space is made smaller, the error will not occur for the reason mentioned above, so 1
The amount of information that can be written on a single card increases accordingly, which also has the advantage of being economical.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of the main part of the first embodiment of the present invention, Fig. 2 is a circuit diagram of the main part of the second embodiment, and Fig. 3 is a circuit diagram of the main part of the bar code display in each of the above embodiments. FIG. 3 is a diagram showing the contents of an end code and the like. 1, 3, 15, 18...and gate, 2...
CPU, 4, 6, 12, 14...CR differential circuit,
5, 7, 16, 20...Counter, 8, 13, 1
9, 22...flip flop, 17...1/N
Frequency divider, 21... matching circuit.

Claims (1)

[Claims] 1. A barcode group in which one set of barcodes consists of at least a series of data codes and an end code provided after the last data code is sequentially read by a barcode reader; A barcode reading control device that controls when a signal is given to an input processing means, comprising gate means for giving the read signal to the input processing means, and a signal corresponding to the end code in the read signal. a detection means for detecting the end code; and supplying the read signal to the gate means to the input processing means until a predetermined time period elapses after the detection means detects the signal corresponding to the end code. 1. A barcode reading control device comprising: a control means for performing control for prohibiting; and a barcode reading control device.