KR960008771Y1 - Volume strength and weakness detecting circuit of electronic organ - Google Patents

Abstract

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Description

Volume intensity detection circuit of electronic organ

1 is a volume intensity detection circuit diagram of an electronic organ according to the present invention,

2 is a signal input and output waveform diagram of each point of the volume intensity detection circuit of the electronic organ according to the present invention,

3 is a pressure sensing device of the electronic organ keyboard used in the volume intensity detection circuit of the electronic organ according to the present invention.

4 is an operation state diagram of a key of an electronic organ,

(a) is a side view of an electron organ,

(b) is a pressurized state diagram of an electronic organ keyboard.

* Explanation of symbols for main parts of the drawings

11, 12: light emitting diodes 13, 14: light receiving transistor

5, 17: Field Effect Transistor (FET)

16, 18: buffer circuit 19: first detection hole

20: second detection ball 21: keyboard

CPU: Central Processing Unit (CPU)

C ₁ ~ C ₂ : Condenser A: Keyboard Press Device

The present invention relates to an electronic organ volume-weakness detection circuit, in particular, which can detect negative strength and weakness in the central calculation process by the value of the voltage charged to the capacitor in the electronic organ.

In general, the electronic organ may have only the on / off effect of the corresponding sound as it is pressed, and also has the function of generating a delicate sound by varying the intensity of the sound depending on the strength of pressing a key such as a piano.

In particular, in the latter case, as shown in FIG. 3, the pressure sensing device A is configured to detect the key according to the state in which the key is pressed, and the state in which the key is first pressed, the state in which the key is completed, and the key are returned to their original positions. Although the sensor detects the pressed state of the keyboard based on the detected signal and uses the information (DATA) to determine the sound length, the central processing unit uses the output signal of the optical sensor. There was a lot of circuitry to determine the strength and weakness of reading directly from the CPU.

In other words, since the sound intensity is controlled according to the time (speed) from the time of first pressing the judgment of strength and weakness to the completion of the press, it is difficult to control the sound intensity using only the output signal of the optical sensor in the CPU. Lack of precision requires a circuit that can accurately measure and transmit the key press speed between the optical sensor and the central processing unit (CPU).

Therefore, the present invention consists of a field effect transistor (PET), a buffer circuit and a condenser in order to solve all the problems occurring in the conventional electronic organ as described above until the start of the key press and the completion of the press. It is an object of the present invention to provide an electronic organ loud and weak detection circuit capable of detecting a negative intensity by a central processing unit (CPU) due to the magnitude of a voltage charged in a capacitor of a capacitor.

The present invention to achieve the above object,

In the electronic organ, the first light emitting diode and the light receiving transistors 11 and 13 installed at a predetermined position of the keyboard 21 to detect the initial pressing state of the keyboard 21, and the fully pressed state of the keyboard 21. An optical sensor comprising a second light emitting diode and a light receiving transistor (12, 14) for detecting the:

A gate terminal is connected to the collector terminal of the first light receiving transistor 13, a drain terminal is connected to the collector terminal of the first light receiving transistor 13 via a capacitor C ₁ , and a source terminal is connected to the ground GND. And the first field effect transistor 15 connected to the drain terminal with a ground and a resistor:

A first buffer circuit 16 which is connected to the collector terminal of the first light receiving transistor 13 via the capacitor C ₁ and buffers the input signal;

Second field effect transistor 17 having a gate terminal connected to the collector terminal of the second light receiving transistor 14, a drain terminal connected to the output terminal of the buffer circuit 16, and a source terminal connected to the capacitor C ₂ . Wow :

A second buffer circuit 18 connected to the source terminal of the second field effect transistor 17 to buffer an input signal;

And a central processing (CPU) for receiving the output signal of the second buffer circuit 18 and detecting the pressing force of the keyboard 21.

The above objects, features and effects of the present invention will be more clearly understood by the embodiments described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a volume intensity detection circuit of an electronic organ according to the present invention, and FIG. 2 is a signal input and output waveform diagram of each point of the volume detection circuit of an electronic organ according to the present invention, and FIG. It is a pressure sensing device of an electronic organ key used in a volume intensity detection circuit of an electronic organ.

FIG. 4 is a diagram of key operating states of electron organs, (a) is a side view of an electron organ key, and (b) is a pressurized state diagram of an electron organ key.

When the driving power is applied to the electron organ, the light emitting diodes 11 and 12 provided in the key press device A as shown in FIG. 3 are in the light emitting (ON) state.

In the above state, when the user of the electronic organ does not press the key 21 of the key pressing device A as shown in Fig. 4A, each light emitting diode maintaining the light emitting state ( Signals of light emitted from 11 and 12 are transmitted to base ends of the light receiving transistors 13 and 14 of the light receiving unit through the first and second sensing holes 19 and 20. The light receiving transistors 13 and 14 are turned on by the light signals transmitted to the base ends of the light receiving transistors 13 and 14, and the collectors of the respective light receiving transistors 13 and 14 turned on. The reference voltage Vcc supplied through the resistor connected to the stage flows to the ground GND through the emitter terminals of the light receiving transistors 13 and 14.

Therefore, the potential of the collector end of each of the light receiving transistors 13 and 14 is in the state of the low level.

The low level signal outputted from the 'S' point at the collector end of the light receiving transistor 13 is the gate terminal of the capacitor C ₁ and the first field effect transistor (FET) 15. Is sent to.

The capacitor condenser by a signal of a low level state is transferred to the (C ₁₎ (C ₁₎ is no longer charging the buffer (BUFFER) circuit 16 by the capacitor (C ₁₎ that is not the charging is buffered It will not work.

The field effect transistor 15 is turned on by a low level signal transmitted to the gate terminal of the first field effect transistor 15.

On the other hand, the low level signal output to the 'P' point of the collector terminal of the light receiving transistor 14 is transmitted to the gate terminal of the second channel (CHANNEL) field effect transistor (17), The second field effect transistor 17 is cut off by the low level signal transmitted to the gate terminal, and the central processing unit is turned on by the second field effect transistor 17 in the blocked state. (CENTRAL PROCESSING UNT: CPU) will not work.

In addition, when the user who uses the electronic organ is to strongly press the key 21 of the key pressing device A as shown in FIG. 4 (b), the key 21 of the key pressing device A is used. ) Is instantaneously entered into the electronic organ, wherein the first sensing hole (19) and the second sensing hole (20) formed in the key 21 of the key pressing device (A) ( 19) first enters the organ.

Signals of light emitted from the light emitting diodes 11 among the light emitting diodes 11 and 12 maintaining the light emitting state are blocked by the first sensing hole 19 that enters the electron organ, The signal of the light emitted from the diode 11 is not transmitted to the base end of the light receiving transistor 13, and the signal of the light emitted from the base end of the light receiving transistor 13 is not transmitted, thus receiving the light receiving transistor 13 ) Is turned OFF.

As shown in FIG. 2, the collector stage of the turned-off light receiving transistor 13 is converted from the low level state to the high level state by the signal voltage supplied from the reference voltage Vcc.

Accordingly, the high level signal output from the collector terminal (ie, 'S' point) of the light receiving transistor 13 is transmitted to the gate terminal of the capacitor C ₁ and the first field effect transistor 15. do.

The capacitor (C ₁₎ the high level by the signal capacitor (C ₁₎ of the state is sent to is to charge the signal from the transmission, the voltage of the signal charge to said capacitor (C ₁₎ is illustrated in FIG. 2 As described above, the signal is gradually discharged and transmitted to the non-inverting input terminal (+) of the buffer circuit 16 (that is, the point 'V ₁ ') is buffered by the buffer circuit 16 to form the second channel-effect transistor 17. Is transferred to the drain terminal DRAIN.

On the other hand, the first field effect transistor 15 is blocked by the high level signal transmitted to the gate terminal of the first field effect transistor 15.

At this time, the second sensing hole 20 formed in the keyboard 21 of the key pressing device A does not enter the inside of the electron organ so that the light signal emitted from the light emitting diode 12 is The light receiving transistor 14 remains turned on by the signal of the emitted light transmitted through the second sensing hole 20, and the collector stage (ie, 'P' point) of the light receiving transistor 14 to be turned on. Will remain at the low level.

The low-level signal output from the collector terminal (ie, 'P' point) of the light receiving transistor 14 is transmitted to the gate terminal of the second field effect transistor 17 to transmit the second field effect transistor ( 17) will remain blocked.

At this time, when the key 21 of the key pressing device A is completely pressed, the second sensing hole 20 formed in the key 21 of the key pressing device A enters into the interior of the electronic organ. do.

The light signal emitted from the light emitting diodes 12 among the light emitting diodes 11 and 12 maintaining the light emitting state is blocked by the second sensing hole 12 that enters the electron organ, and the light emitting diodes The signal of the light emitted from 12 is not transmitted to the base end of the light receiving transistor 14 of the light receiving unit, and the signal of the light emitted from the base end of the light receiving transistor 14 is not transmitted. 14 is turned off.

The collector stage (ie, 'P' point) of the turned-off light receiving transistor 14 is in a high level state in a low level state by a signal voltage supplied from a reference voltage Vcc as shown in FIG. Is returned.

The high level signal output from the collector terminals (ie, 'P' point) of the light receiving transistors 13 and 14 is transmitted to the gate terminal of the second field effect transistor 17 and is transmitted to the gate terminal. The second field effect transistor 17 is turned on by the high level signal.

The signal voltage in the current state transmitted by the second field effect transistor 17 in the on state to the non-inverting input terminal (+) (ie, 'V ₁ ' point) of the buffer circuit 16 is a buffer circuit ( 16) and to the capacitor C ₁ via the drain terminal DRAIN and the source SOURCE of the second field effect transistor 17, the signal transmitted to the capacitor C _{1 is} shown in FIG. As described above, the capacitor C ₁ is rapidly charged, and the signal charged in the capacitor C ₁ is transmitted to the non-inverting input terminal (+) (ie, 'V ₁ ' point) of the buffer circuit 18. do.

The signal transmitted to the non-inverting input terminal (+) (ie, 'V ₁ ' point) of the buffer circuit 18 is buffered by the buffer circuit 18, and the buffered signal is connected to the output terminal of the buffer circuit 18. To the central processing unit (CPU).

On the other hand, when the user returns the key 21 of the key pressing device A to its original position, the first sensing hole 19 and the second sensing hole formed in the key of the key pressing device A are detected. Among the balls 20, the second sensing hole 20 is first emitted from the inside of the electron organ, and the light emitting diode is maintained in the light emitting state by the second sensing hole 20 coming out of the inside of the electron organ ( 12 is transmitted to the base end of the light receiving transistor 14 of the light receiving unit through the second sensing hole 20, and the light receiving transistor 14 is turned by the signal of the light transmitted to the base end. On, the reference voltage Vcc supplied through a resistor connected to the collector terminal (ie, 'P' point) of the turned-on light receiving transistor 14 flows to the ground through the emitter ends of the light receiving transistor 14. do.

Therefore, the potential of the collector terminal of the light receiving transistor 14 is in a low level state.

The low-level signal output from the collector terminal ('P' point) of the light receiving transistor 14 is the second field effect transistor 17 is a blocking state, the second field effect in the blocking state The signal output from the buffer circuit 16 by the transistor 17 is not transmitted to the CPU.

When the first sensing hole 19 formed in the key 21 of the key pressing device A exits from the inside of the electron organ, the light emitted from the light emitting diode 11 maintaining the light emitting state is The signal is transmitted to the base end of the light receiving transistor 13 of the light receiving unit through the first sensing hole 19, and the light receiving transistor 13 is turned on by the light signal transmitted to the base end, and the turned on light receiving transistor The light receiving transistor 13 is turned on by the signal of light transmitted to the base end of the base 13 and is transmitted to the base end of the turned on light receiving transistor 13, and is transmitted to the base end. The light receiving transistor 13 is turned on by the received light signal, and the reference voltage Vcc supplied to the collector terminal of the turned on light receiving transistor 13 flows to the ground through the emitter end.

The potential of the collector terminal (ie, 'S' point) of the light receiving transistor 13 is converted from a high level state to a low level state.

The low level signal output from the collector terminal (ie, 'S' point) of the light receiving transistor 13 is transmitted to the capacitor C ₁ and the gate terminal of the first field effect transistor 15.

The first field effect transistor 15 is turned on by the low level signal transmitted to the gate terminal, and the capacitor C ₁ is connected to the drain terminal of the turned on first field effect transistor 15. Is charged to ground through the drain terminal and the source terminal of the first field effect transistor 15.

That is, when the key 21 of the key press device A is pressed strongly, the time from the initial press of the key 21 to the complete press is shortened, and the key 21 of the key press device A is held down. Pressing lightly takes a long time from the initial press of the keyboard 21 to the complete press.

Therefore, when the key 21 of the key pressing device A is strongly pressed, the capacitor C ₁ is charged with low voltage to the non-inverting input terminal (+) (ie, 'V ₁ ' point) of the buffer circuit 16. Since a high voltage is output and transmitted to the CPU, the CPU may determine negative strength and weakness according to the magnitude of the transmitted voltage (eg, '5, 6'V).

On the other hand, when the key 21 of the key press device A is weakly pressed, the capacitor C ₁ is charged with a high voltage to the non-inverting input terminal (+) (ie, 'V ₁ ' point) of the buffer circuit 16. Since a low voltage is output and transmitted to the CPU, the CPU determines the magnitude of the transmitted voltage (for example, '2,5' V), and thus the magnitude of the voltage (for example, ' 2,5 'V) can determine the negative intensity.

As described above, the present invention may generate delicate sound quality according to the pressing speed of pressing the key of the electronic organ, thereby improving the reliability of the quality of the electronic organ.

Claims (1)

In the electronic organ, the first light emitting diode and the light receiving transistors 11 and 13 installed at a predetermined position of the keyboard 21 to detect the initial pressing state of the keyboard 21, and the fully pressed state of the keyboard 21. An optical sensor comprising a second light emitting diode and a light receiving transistor (12, 14) for detecting a; and a gate terminal is connected to the collector terminal of the first light receiving transistor 13, the drain terminal via a capacitor (C ₁ ) A first field effect transistor 15 connected to a collector terminal of the first light receiving transistor 13 and a source terminal of which is connected to a ground (GND), and connected to a drain terminal of a resistor: a first light receiving transistor ( A first buffer circuit 16 for buffering an input signal connected to the collector end of the capacitor 13 via the capacitor C ₁ and a gate terminal connected to the collector end of the second light receiving transistor 14. The terminal is the buffer circuit (1 A second field effect transistor 17 connected to an output terminal of 6) and a source terminal of which is connected to a capacitor C ₂ ; a second buffering signal which is connected to a source terminal of the second field effect transistor 17. 2 buffer circuit 18 and the electronic organ volume control, characterized in that it comprises a central processing (CPU) for receiving the output signal of the second buffer circuit 18 to detect the pressing strength of the keyboard (21) Detection circuit.