TW201514848A - Audio adjusting circuit and electronic device using the same - Google Patents

Abstract

An electronic device includes a power supply, an audio adjusting circuit, and an audio outputting unit. The power supply provides a provided voltage. The audio outputting unit outputs a prompting audio. The audio adjusting circuit includes a controlling unit, a switching unit, and a adjusting unit. The controlling unit includes a first port and a second port for generating control signals. The control signals include a first control signal and a second control signal. The switching unit establishes a connection between the power supply and the adjusting unit when received the first control sing from the first port or the second port. The adjusting unit generates different working voltages based on the received signals from the first port and the second port for controlling the audio outputting unit to output the corresponding prompting audio. A related audio adjusting circuit is also provided.

Description

Audio adjustment circuit and electronic device having the above audio adjustment circuit

The present invention relates to an audio adjustment circuit and an electronic device electronic having the above audio adjustment circuit.

A buzzer applied to an electronic device is used to generate a beep. At present, the buzzer can only output a single sound, which is relatively monotonous.

In view of the above, it is necessary to provide an electronic device having an audio adjustment circuit that can output different prompt sounds.

It is also necessary to provide an audio adjustment circuit.

An electronic device includes a power supply unit and an audio output unit. The power supply unit is used to supply the supply voltage. The audio output unit is used to output a tone. The electronic device also includes an audio adjustment circuit. The audio adjustment circuit includes a control unit, a switch unit, and an adjustment unit. The control unit has a first output and a second output for outputting a control signal. The control signal includes a first control signal and a second control signal. The switch unit establishes an electrical connection between the power supply unit and the adjustment unit when receiving the first control signal. The adjusting unit outputs different working voltages according to the first output end and the second output end to output different combinations of control signals to control the audio output unit to output corresponding prompt sounds.

An audio adjustment circuit is connected between the power supply unit and the audio output unit for outputting different operating voltages to control the audio output unit to output a corresponding prompt tone. The audio adjustment circuit includes a control unit, a switch unit, and an adjustment unit. The control unit has a first output and a second output for outputting a control signal. The control signal includes a first control signal and a second control signal. The switch unit establishes an electrical connection between the power supply unit and the adjustment unit when receiving the first control signal. The adjusting unit outputs different working voltages according to the first output end and the second output end to output different combinations of control signals to control the audio output unit to output corresponding prompt sounds.

By adopting the above audio adjusting circuit and the electronic device, the audio output unit can output different prompt sounds by different output working voltages, thereby enhancing the interest of the electronic device.

100‧‧‧Electronic equipment

10‧‧‧Power unit

20‧‧‧Audio adjustment circuit

21‧‧‧Control unit

23‧‧‧Switch unit

25‧‧‧Adjustment unit

30‧‧‧Audio output unit

V1‧‧‧ voltage source

P1‧‧‧ first output

P2‧‧‧ second output

Ra‧‧‧ Pull-up resistor

Q1‧‧‧First Triode

D1‧‧‧First Diode

D2‧‧‧ second diode

T1‧‧‧first transistor

T2‧‧‧second transistor

D3‧‧‧ third diode

R1‧‧‧first resistance

R2‧‧‧second resistance

R3‧‧‧ third resistor

1 is a block diagram of a preferred embodiment of an electronic device.

2 is a circuit diagram of a preferred embodiment of the electronic device of FIG. 1.

Please refer to FIG. 1 , which is a block diagram of a preferred embodiment of an electronic device 100 . The electronic device 100 can output different prompt sounds.

The electronic device 100 includes a power supply unit 10, an audio adjustment circuit 20, and an audio output unit 30.

The power supply unit 10 is for providing a supply voltage. In the present embodiment, the power supply voltage is 5V.

The audio adjustment circuit 20 is for outputting different operating voltages to control the audio output unit 30 to output different prompt tones. The audio adjustment circuit 20 includes a control unit 21, a switch unit 23, and an adjustment unit 25.

The control unit 21 has a first output P1 and a second output P2. The control unit 21 can output the first control signal or the second control signal respectively through the first output terminal P1 and the second output terminal P2. In this embodiment, the control unit 21 can output different combinations of control signals by the first output terminal P1 and the second output terminal P2 according to different buttons pressed by the user; the first control signal is a high level signal, and the second control signal The control signal is a low level signal. In other embodiments, the first output terminal P1 and the second output terminal P2 of the control unit 21 can also output different combined control signals through the first output terminal P1 and the second output terminal P2 when the electronic device 100 is in different states.

The switch unit 23 is connected between the power supply unit 10 and the control unit 21. The switch unit 23 establishes an electrical connection established between the power supply unit 10 and the adjustment unit 25 when the first output terminal P1 or the second output terminal P2 outputs the first control signal, and is at the first output terminal P1 and the second output terminal P2. When the second control signal is output, the electrical connection between the power unit 10 and the adjustment unit 25 is disconnected.

The adjusting unit 25 is configured to output different working voltages according to the received control signals. When the first control signal is outputted by the first output terminal P1 and the second output terminal P2, the adjusting unit 25 outputs the first working voltage; when the first output terminal P1 outputs the first control signal and the second output terminal P2 outputs the second When the signal is controlled, the adjusting unit 25 outputs the second working voltage; when the first output terminal P1 outputs the second control signal and the second output terminal P2 outputs the first control signal, the adjusting unit 25 outputs the third working voltage; when the first output When both the terminal P1 and the second output terminal P2 output the second control signal, the adjusting unit 25 stops outputting the operating voltage. In this embodiment, the second operating voltage is less than the first operating voltage and greater than the third operating voltage; the first operating voltage is equal to the supply voltage.

The audio output unit 30 outputs a corresponding prompt sound according to the received operating voltage. In the present embodiment, the audio output unit 30 is a buzzer that adjusts the volume of the prompt sound according to different operating voltages, and the magnitude of the operating voltage is proportional to the magnitude of the volume. In other embodiments, the audio output unit 30 adjusts the pitch of the prompt tone according to different operating voltages, and the magnitude of the operating voltage is proportional to the level of the pitch.

Referring to FIG. 2, the power supply unit 10 includes a voltage source V1. The voltage source V1 is used to output the operating voltage.

The control unit 21 includes a first output terminal P1 and a second output terminal P2. The first output terminal P1 is electrically connected to the switch unit 23 and the adjustment unit 25, respectively. The second output terminal P2 is electrically connected to the switch unit 23 and the adjustment unit 25, respectively.

The switching unit 23 includes a first triode Q1, a first diode D1, a second diode D2, and a pull-up resistor Ra. The base of the first transistor Q1 is electrically connected to the first output terminal P1 by the first diode D1. The emitter of the first transistor Q1 is electrically connected to the adjustment unit 25. The collector of the first transistor Q1 is electrically connected to the voltage source V1. The anode of the first diode D1 is electrically connected to the first output terminal P1. The cathode of the first diode D1 is electrically connected to the base of the first transistor Q1. The anode of the second diode D2 is electrically connected to the second output terminal P2. The cathode of the second diode D2 is electrically connected to the base of the first transistor Q1. One end of the pull-up resistor Ra is electrically connected to the base of the first triode Q1, and the other end is grounded. In the present embodiment, the first triode Q1 is an NPN type triode.

The adjusting unit 25 includes a first transistor T1, a second transistor T2, a first resistor R1, a second resistor R2, a third resistor R3, and a third diode D3. The gate of the first transistor T1 is electrically connected to the first output terminal P1. The source of the first transistor T1 is electrically connected to the emitter of the first transistor Q1. The drain of the first transistor T1 is electrically connected to the audio output unit 30. The gate of the second transistor T2 is electrically connected to the second output terminal P2. The source of the second transistor T2 is grounded. The drain of the second transistor T2 is electrically connected to the audio output unit 30 via the third diode D3. One end of the first resistor R1 is electrically connected to the source of the first transistor T1, and the other end is electrically connected to the drain of the first transistor T1. One end of the second resistor R2 is electrically connected to the source of the second transistor T2, and the other end is electrically connected to the drain of the second transistor T2. One end of the third resistor R3 is electrically connected to the gate of the second transistor T2, and the other end is electrically connected to the source of the second transistor T2. The anode of the third diode D3 is electrically connected to the anode of the second transistor T2. The negative electrode of the third diode D3 is electrically connected to the drain of the first transistor T1. In the present embodiment, the first transistor T1 is a P-type field effect MOS body, and the second transistor T2 is an N-type field effect MOS body; the resistance of the second resistor R2 is greater than four times the resistance of the first resistor R1.

The working principle of the electronic device 100 is as follows:

When the first output terminal P1 and the second output terminal P2 simultaneously output the first control signal, the first diode D1 and the second diode D2 are turned on. The voltage difference between the base and the emitter of the first triode Q1 is greater than 0.7V, and the first triode Q1 is turned on. The voltage difference between the gate and the source of the first transistor T1 is less than 0V, and the first transistor T1 is turned on. The voltage difference between the gate and the source of the second transistor T2 is greater than 0V, and the second transistor T2 is turned on. At this time, the first resistor R1 and the second resistor R2 are short-circuited, and the audio output unit 30 outputs the first prompt sound according to the first operating voltage.

When the first output terminal P1 outputs the first control signal and the second output terminal P2 outputs the second control signal, the first diode D1 is turned on, and the second diode D2 is turned off. The voltage difference between the base and the emitter of the first triode Q1 is greater than 0.7V, and the first triode Q1 is turned on. The voltage difference between the gate and the source of the first transistor T1 is less than 0V, and the first transistor T1 is turned on. The voltage difference between the gate and the source of the second transistor T2 is less than 0V, and the second transistor T2 is turned off. At this time, the first resistor R1 is short-circuited, and the audio output unit 30 receives the second operating voltage and outputs a second prompt tone.

When the first output terminal P1 outputs the second control signal and the second output terminal P2 outputs the first control signal, the first diode D1 is turned off, and the second diode D2 is turned on. The voltage difference between the base and the emitter of the first triode Q1 is greater than 0.7V, and the first triode Q1 is turned on. The voltage difference between the gate and the source of the first transistor T1 is greater than 0V, and the first transistor T1 is turned off. The voltage difference between the gate and the source of the second transistor T2 is less than 0V, and the second transistor T2 is turned off. At this time, the audio output unit 30 receives the third operating voltage and outputs a third prompt tone.

When the first output terminal P1 and the second output terminal P2 simultaneously output the second control signal, the first diode D1 and the second diode D2 are turned off. The voltage difference between the base and the emitter of the first triode Q1 is less than 0.7V, and the first triode Q1 is turned off. At this time, the audio output unit 30 does not receive the operating voltage and stops outputting the prompt tone.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art to the present invention should be included in the following claims.

no

100‧‧‧Electronic equipment

10‧‧‧Power unit

20‧‧‧Audio adjustment circuit

21‧‧‧Control unit

23‧‧‧Switch unit

25‧‧‧Adjustment unit

30‧‧‧Audio output unit

Claims (10)

An electronic device comprising a power supply unit and an audio output unit; the power supply unit is configured to provide a power supply voltage; the audio output unit is configured to output a prompt tone; and the improvement is that the electronic device further comprises an audio adjustment circuit; the audio adjustment circuit comprises a control unit, a switch unit, and an adjustment unit; the control unit has a first output end and a second output end for outputting a control signal; the control signal includes a first control signal and a second control signal; the switch unit receives the first Establishing an electrical connection between the power supply unit and the adjustment unit when the control signal is generated; the adjustment unit outputs different operating voltages according to the first output end and the second output end to output different combinations of control signals to control the corresponding prompts of the audio output unit output sound. The electronic device of claim 1, wherein when the first output terminal and the second output terminal simultaneously output the first control signal, the adjusting unit outputs a first working voltage; when the first output terminal outputs When the second control terminal outputs the second control signal, the adjusting unit outputs a second working voltage; when the first output terminal outputs the second control signal and the second output terminal outputs the first control signal, the adjusting The unit outputs a third working voltage; the first working voltage, the second working voltage, and the third working voltage are different from each other. The electronic device of claim 2, wherein the second operating voltage is greater than the third operating voltage and less than the first operating voltage; the first operating voltage is equal to the supply voltage. The electronic device of claim 1, wherein when the first output terminal and the second output terminal simultaneously output the second control signal, the switch unit disconnects the electrical connection between the power supply unit and the adjustment unit. The adjusting unit stops outputting the operating voltage; the audio output unit stops outputting the prompt tone. The electronic device of claim 1, wherein the adjusting unit comprises a first transistor, a second transistor, a first resistor, a second resistor, and a third diode; a gate of the first transistor Electrically connecting with the first output end; the source of the first transistor is electrically connected to the switch unit; the drain of the first transistor is electrically connected to the audio output unit; and the gate of the second transistor is connected to the second output end Electrically connecting; the source of the second transistor is grounded; the drain of the second transistor is electrically connected to the audio output unit by the third diode; and the source of the first resistor is electrically connected to the source of the first transistor Connecting, the other end is electrically connected to the first pole of the first transistor; one end of the second resistor is electrically connected to the source of the second transistor, and the other end is electrically connected to the drain of the second transistor; The positive electrode of the polar body is electrically connected to the drain of the second transistor; the negative electrode of the third diode is electrically connected to the drain of the first transistor. An audio adjustment circuit is connected between the power supply unit and the audio output unit; and is configured to output different operating voltages to control the audio output unit to output a corresponding prompt tone; the improvement is that the audio adjustment circuit includes a control unit, a switch unit, and An adjustment unit; the control unit has a first output end and a second output end for outputting a control signal; the control signal includes a first control signal and a second control signal; the switch unit establishes a power source when receiving the first control signal An electrical connection between the unit and the adjustment unit; the adjustment unit outputs different operating voltages according to the first output end and the second output end to output different combinations of control signals to control the audio output unit to output corresponding prompt sounds. The audio adjustment circuit of claim 6, wherein the first output terminal and the second output terminal simultaneously output the first control signal, the adjustment unit outputs a first working voltage; when the first output terminal outputs When the second control terminal outputs the second control signal, the adjusting unit outputs a second working voltage; when the first output terminal outputs the second control signal and the second output terminal outputs the first control signal, the adjusting The unit outputs a third working voltage; the first working voltage, the second working voltage, and the third working voltage are different from each other. The audio adjustment circuit of claim 7, wherein the second operating voltage is greater than the third operating voltage and less than the first operating voltage; the first operating voltage is equal to the supply voltage. The audio adjustment circuit of claim 6, wherein when the first output terminal and the second output terminal simultaneously output the second control signal, the switch unit disconnects the power between the power supply unit and the adjustment unit. Sexual connection, the adjustment unit stops outputting the working voltage; the audio output unit stops outputting the prompt tone. The audio adjustment circuit of claim 6, wherein the adjustment unit comprises a first transistor, a second transistor, a first resistor, a second resistor, and a third diode; the gate of the first transistor The pole is electrically connected to the first output end; the source of the first transistor is electrically connected to the switch unit; the drain of the first transistor is electrically connected to the audio output unit; and the gate of the second transistor is connected to the second output The terminal of the second transistor is grounded; the drain of the second transistor is electrically connected to the audio output unit by the third diode; one end of the first resistor is electrically connected to the source of the first transistor The other end is electrically connected to the first pole of the first transistor; one end of the second resistor is electrically connected to the source of the second transistor, and the other end is electrically connected to the drain of the second transistor; The anode of the diode is electrically connected to the anode of the second transistor; the cathode of the third diode is electrically connected to the anode of the first transistor.