JPS633332B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to electronic equipment.

[Conventional technology]

Conventionally, electronic desktop calculators such as print-type desktop calculators, display-type desktop calculators, and program-type desktop calculators have employed various types of warning devices for issuing warnings to operators.

There are visual methods using lamps, auditory methods using buzzers, etc., and methods that output a message through a printing device to issue a warning to the operator.

[Problem that the invention seeks to solve]

However, these methods have advantages and disadvantages.

In the case of a visual system, the operator must always monitor the warning lamp during operation.

The auditory system makes noise difficult, and the type of warning is unclear.

Furthermore, the message system using a printing device has the disadvantage that the warning message is inserted between a print list that has a series of meanings for each warning.

[Means for solving problems]

In order to solve these problems, the present invention provides a sound warning, but by providing this sound in response to a key operation, an electronic system that can give a low-noise warning can be used. The purpose is to provide equipment.

In order to achieve this object, the present invention includes an input means having a plurality of keys, a sound generation means for generating sound, a key detection means for detecting the operation of the keys of the input means, and a state in which the sound should be generated. It is comprised of a state detecting means for detecting a state, and a control means for generating a sound in response to a signal from the key detecting means when the state detecting means is in a state in which a sound should be generated.

[Effect]

When a key is operated in a state in which a sound should be generated by the state detection means, this is detected by the key detection means, and the sound generation means generates a sound in response to the key operation.

〔Example〕

FIG. 1 is a block diagram for explaining one embodiment of the present invention.

1 is the keyboard, 2 is the central processing unit (CPU)
3 is a device that detects key presses, and 4 is an output device such as a display or printing device that receives output signals from the CPU 2.

5 is a buzzer, 6 is an AND gate, and 7 is a key signal from the keyboard, which is led to the CPU 2 and a device 3 that detects key presses.

8 is a timing signal sent to the keyboard, 9
10 is a signal line indicating that the output signal 9 is also used as the timing signal 8 in some cases. Reference numeral 11 indicates an output line from the detection device 3, and reference numeral 12 indicates a signal output by the CPU 2 indicating a status for issuing a warning.

FIG. 2 is a detailed diagram of the detection device 3. In this embodiment, four key signal lines are specifically shown as the key signal lines 7. 13 is a retrigger type one-shot multivibrator (one-shot multi-vibrator)
mutli) For example, TI's well-known IC
There are 74123. 14 and 15 are resistors and capacitors, respectively, which are elements for programming the set time (time constant) of the one-shot multivibrator 13. 16 is an OR gate.

FIG. 3 is a timing chart for explaining the operation of the trigger one shot. When the input signal to the one-shot multi 13 arrives, the one-shot multi 13 is set in synchronization with the rising edge of the input signal, and is reset after a predetermined time (T in Fig. 3) has elapsed using the resistor 14 and capacitor 15. do.

However, when an input pulse is received again within time T after being set, the reset operation continues with one shot, and the set state continues.

FIG. 4 shows a keyboard wiring diagram used in this embodiment. In the eight lines L0 to L7 in the column direction, the fifth
Eight different timing signals T0 to T7 are supplied through the CPU 2 as shown in the timing chart in the figure.

Also, since this period is from several tens of μs to several ms,
A key, usually by a single press of the key by a human.
The cycle of SW is sufficiently short considering that it remains on for several hundred milliseconds.

The four lines K0-K3 are keys SW placed at the intersections of lines L0-L7 and lines K0-K3.
The signal T0~ transmitted by turning on
Derive T7.

Now, if the key SW corresponding to the intersection of the line L2 and the line K1 in FIG. 4 is pressed down, the signal T2 will naturally appear on the line K1 while the key continues to be pressed down. This signal is sent to the CPU 2 and reaches the input of the one shot multi 13 through the OR gate 16, and the signal line 11 is set to a high level. By programming the time constant of the one-shot multi 13 to be 1.5 times the cycle of the timing signal T2, the signal line 11 will remain at a high level for as long as the key is pressed, regardless of which key in FIG. It operates as key press detection means, which is one of the main points of the present invention.

On the other hand, the CPU 2 is configured to notify the outside through the signal line 12 whenever a warning should be issued.

For example, when the key buffer is about to become full due to the operator's current key operation, the CPU 2 sets the signal line 12 to a high level. At this time, the key SW has not been turned off yet, so a high level appears in the output of the AND gate 6, and the buzzer 5 sounds as a warning only until the key is released. In normal cases, the period during which a key is pressed is several hundred milliseconds, as mentioned above, so it is not felt as noise. It goes without saying that warnings caused by other factors can be distinguished by intermittent buzzer sounds by controlling the signal on the signal line 12 alternately between high and low levels. In addition, when the CPU determines that a warning should be issued, key operation detection is performed.
It may be determined by the CPU and drive a buzzer.

As described above, according to the present invention, it is possible to reduce the adverse effects of noise by generating the most reliable method of warning, which appeals to the sense of hearing, only during the period when a key is pressed.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment according to the present invention, and FIG.
The figure shows the key press detection circuit, Figure 3 is a timing diagram explaining the operation of the retrigger one shot, and Figure 4 shows the key press detection circuit.
The figure is a keyboard circuit diagram, and FIG. 5 is a timing diagram of the keyboard. 3...Key detection circuit, 6...AND gate.

Claims (1)

[Scope of Claims] 1. An input means having a plurality of keys; a sound generation means for generating sound; and a key operation that detects the operation of a key of the input means and generates a signal that continues during the operation of the key. a detection means; a state detection means for detecting whether the electronic device is in a warning state; and when the state detection means detects that the electronic device is in a warning state; An electronic device comprising: control means for causing the sound generation means to generate sound in response to a signal from the key operation detection means. 2. The electronic device according to claim 1, wherein the state detection means detects whether or not a key buffer overflow warning is to be issued in accordance with the amount of data in the key buffer of the electronic device.