JPS6016999Y2 - Electronic device with pronunciation function - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electronic device with a sound generation function that uses two different piezoelectric buzzer drive systems for different sound generation functions to produce sounds of different volumes.

For example, small electronic calculators that have a timekeeping function are in practical use, and some of those that have this kind of timekeeping function also have an alarm function.

Other small electronic calculators are also equipped with a sounding means that sounds when a key is turned on to notify that the key has been operated reliably.

Incidentally, in models that have both the alarm function and the sound alarm function when the key is turned on, the sounding means is usually used for the same purpose.

However, with this conventional sound generation method, only a single tone or volume can be produced, so if the volume is set to the key-on sound volume, the alarm sound will be too low to be practical, or conversely, if it is set as the alarm sound. In this case, there is a drawback that the notification sound when the key is turned on becomes louder than necessary, and furthermore, it is impossible to distinguish between the two functions by the sound.

Therefore, a plurality of sounding bodies with different tones or volumes are provided separately, each corresponding to one function, and the appropriate tones or volumes are selected and produced, and the functions can be distinguished by sound. However, this has the disadvantage of not only complicating the structure but also increasing cost due to the large number of sounding bodies.

This invention was made in view of the above circumstances, and the purpose is to provide an electronic device with a sound generation function that uses a single sounding body to produce sounds of different volumes by using different driving methods for the sounding body depending on the function. do.

Hereinafter, one embodiment of this invention will be described in detail with reference to the drawings.

In FIG. 1, 1 is a pulse generator known as an astable multi-by-break, which oscillates at a constant frequency f determined by the capacitances of resistors R1 and R2 and capacitors C1 and C2.

This frequency f is set to take a value near the resonance frequency of the piezoelectric buzzer 2.

This pulse signal is then applied to the A terminal of the piezoelectric buzzer 2 via the AND circuit 3.

The key operator section 4 is equipped with key switches corresponding to numeric keys from 0 to 9 and function keys for commanding various calculations.

In addition, the control unit 5 converts the key sampling signal into a control signal a.
Decoder 7 via buffer 6 whose reading is controlled by
give to

The decoder 7 decodes, for example, a 4-bit key sampling signal, and sequentially outputs the key peaks of the key input unit 4.

[2], i3], 14] line L1,
+-felt [ffi, 17j, line L2 for IK, . . . and lines L1 to L5 are sequentially scanned,
The key operation signals are read into the buffer 8 which is controlled by the control signals outputted to the corresponding lines L6 to L9, respectively.

Note that the lines L6 to L9, on which no key operation is performed, are each grounded through a resistor R, and thus maintain a "0° state."

Therefore, the data stored in the buffer 8 is stored in the calculation storage section 9.
The calculation storage unit 9 calculates and stores the data under the control of various control signals from the control unit 5.

Further, the key-on signals outputted from lines L6 to L9 are applied to one input terminal of AND circuit 3 as an opening/closing control signal via OR circuit 10.degree.11.

In addition, when the calculation storage unit 9 executes the calculation specified by the key manual unit 4 by the control signal from the control unit 5, for example, the data exceeds a predetermined number of digits and overflows, or if the data exceeds a predetermined number of digits. When the key human power section 4 specifies that the calculation be performed beyond the calculation range, the control section 5 outputs an error signal, and the OR circuit 11
The signal is inputted to one input terminal of the AND circuit 3 via.

As is well known, the cancellation of this error signal is
This is done by operating the all clear key [E] of the key manual section 4.

The arithmetic storage unit 9 also has a timekeeping register that sequentially counts up the time using a one-second signal from the control unit 5.
The current time can be displayed on a display unit (not shown).

Further, the calculation storage section 9 has an alarm register, and the desired alarm time can be input to the alarm key mouthpiece of the key manual section 4.
The time set key can be set using Y or the like.

Since these techniques are obvious to those skilled in the art, their construction is not shown in detail.

When it is detected that the alarm time and the current time match, an alarm set signal is applied from the control section 5 to the set terminal S of the flip-flop circuit 12.

The set-side output Q of the flip-flop circuit 12 is applied to one input terminal of the AND circuit 3 via the OR circuit 11.

Furthermore, the output signal of the AND circuit 3 is applied to one input terminal of the NAND circuit 13, and the set side output Q of the flip-flop circuit 12 is directly applied to the other input terminal.

Therefore, when the set side output Q of the flip-flop circuit 12 is "1", the pulse signal output from the pulse generator 1 is sent to the A terminal of the piezoelectric buzzer 2, and the pulse signal whose phase is inverted is sent to the B terminal of the piezoelectric element 2. piezoelectric buzzer 2
to drive.

An alarm reset signal for resetting the flip-flop circuit 12 is automatically applied to the reset terminal R from the control unit 5 via the OR circuit 14 after a predetermined time has elapsed since the output of the alarm set signal, or is applied manually to the line L.
A °°1' signal is applied to IO, and is applied to the reset terminal R via the OR circuit 14.

Next, the operation of the present invention configured as described above will be explained.

From the pulse generator 1 to the AND circuit 3, 1 in Figure 2 A is always sent.
A pulse signal is given as shown in FIG. The gate of the AND circuit 3 is opened and a pulse signal is applied to the A terminal of the piezoelectric buzzer 2 as shown in 3 in FIG. 2A to drive it.

At this time, since the output Q of the flip-flop circuit 12 is 0, the B terminal of the piezoelectric buzzer 2 always receives the signal 4 in FIG. 2A.
"1°" (V volts) is given as follows.

Therefore, the amplitude value of both terminal threshold voltage (A-B) is
5, the voltage becomes V volts, and the piezoelectric buzzer 2 is driven in a single phase.

Further, when an error signal is output from the control unit 5 during execution of the calculation, it is sent to the AND circuit 3 via the OR circuit 11 in the same manner as described above.
The piezoelectric buzzer 2 is driven in a single phase by the pulse signal from the pulse generator 1.

According to experiments, the sound pressure level during single-phase drive is 35 to 40 decibels.

Further, when it is detected that the contents of the time register and the alarm register in the storage section 9 match with each other in the aforementioned calculation, an alarm set signal is outputted from the control section 5, and the flip-flop circuit 12 is set.

Therefore, the set side output Q of this flip-flop circuit 12
becomes "°1", the signal is input to the AND circuit 3 via the OR circuit 11, and the pulse signal is input to the A terminal of the piezoelectric buzzer 2.

At the same time, one input terminal of the NAND circuit 13 receives the "1" signal from the flip-flop circuit 12, and the pulse signal is input to the B terminal of the piezoelectric buzzer 2 with its output phase inverted.

The output of each circuit and the voltage change applied to the piezoelectric buzzer 2 at this time are shown in the timing chart of FIG. 2B.

First, 1 in FIG. 2B is the output of the pulse generator 1.

Reference numeral 2 in FIG. 2B is the set side output Q of the flip-flop circuit 12, which becomes a logic state of 1'' by the alarm set signal.

When the flip-flop circuit 12 is set, the driving voltage applied to both terminals A and 8 of the piezoelectric buzzer 2 becomes 3°4 as shown in FIG. 2B, as described above.

As a result, the voltage between both ends (A-B) becomes as shown in 5 in FIG. 2B, and its amplitude value is 2V volts.

Therefore, the driving method is a push-pull driving method in which pulse waves whose phases are reversed to each other are applied to both the A and 8 terminals, and according to experiments, the sound pressure level is 75 to 80 decibels.

If an alarm reset signal is input automatically or manually to the reset terminal R of the flip-flop circuit 12, the control signals to the AND circuit 3 and the NAND circuit 13 will be canceled, so no pulse signal will be input to the piezoelectric buzzer 2, and no sound will be generated. will be stopped.

In addition, in 3 to 5 of Fig. 2 A and B, the piezoelectric buzzer 2
Although the driving voltage applied to both terminals A and 8 of FIG. 3 to 5
It is slightly more distorted than the square wave shown in .

However, since this distortion does not impede the purpose of the present invention in any way, for convenience of explanation, Figure 2A,
The voltage waveform is expressed as a square wave as shown in 3 to 5 of B.

As described above, in this embodiment, the key-on signal and the error signal were selected as one of the operating signals, and the alarm signal was selected as the other operating signal, but the key-on signal and the error signal may be selected as each operating signal, and their functional classifications Of course, the method can be selected as appropriate.

In this example, an unstable multivibrator was used as the oscillator, but other oscillators may be used, or the output may be used as is, or it may be used as a pulse generator to drive a small electronic calculator. If the frequency is divided appropriately and used near the resonant frequency of the piezoelectric buzzer, an oscillator is no longer necessary, and costs can be reduced.

As described in detail above, the present invention provides a single piezoelectric buzzer having two input terminals; when the first sound generation function is selected, a driving signal of a predetermined frequency is applied to one input terminal; A first drive signal control circuit performs single-phase drive while holding the terminal at a predetermined voltage level, and when a second sound generation function is selected, a drive signal having frequencies whose phases are inverted from each other is applied to the two input terminals. Since the piezoelectric buzzer is configured to include a second drive signal control circuit that performs push-pull drive, it is possible to distinguish which sound generation function is selected by the volume of the sound generated from the piezoelectric buzzer, and there is only one piezoelectric buzzer. Therefore, the overall structure can be maintained at low cost without becoming complicated, and excellent practical effects can be achieved, such as being optimal as a structure for small electronic devices.

[Brief explanation of the drawing]

Figure 1 is a schematic circuit configuration diagram showing an embodiment of this invention, and Figure 2 is a timing chart of each output signal, where A shows the case of the single-phase drive system and B shows the case of the push-pull drive system. . 1... Pulse generator, 2... Piezoelectric buzzer, 3... AND circuit, 4... Key human power section, 5... Control part, 9... calculation/storage part, 10, 11... OR circuit, 12...
...Flip-flop circuit, 13...NAND circuit.

Claims (1)

[Claims for Utility Model Registration] In an electronic device having multiple sound generation functions, a single piezoelectric buzzer having two input terminals, and a drive signal that generates a drive signal having a predetermined frequency to drive the piezoelectric buzzer. a generating circuit; a sounding function detection section that detects selection of at least a first and second sounding function; and an input of one of the piezoelectric buzzers when the first sounding function is detected by the sounding function detection section. A first drive signal control circuit applies a drive signal of the predetermined frequency to one input terminal and holds the other input terminal at a predetermined voltage level to drive the voltage buzzer in a single phase; When the sound generation function is detected, applying the drive signal of the predetermined frequency to one input terminal of the voltage buzzer, and applying the drive signal with the phase reversed to the other input terminal,
and a second drive signal control circuit that drives the piezoelectric buzzer in a push-pull manner, and the selection of the first and second sound generation functions is differentiated based on the volume of the sound generated from the piezoelectric buzzer. Electronic equipment with functions.