TWI544810B - Volume controlling apparatus - Google Patents

Description

Volume control device

A volume control technology, and more particularly to a volume control device and method.

With the advent of the digital age, consumers are paying more and more attention to the audio and video functions (Audio and Video Function) attached to notebook computers. At present, the volume control on the notebook computer is mostly controlled by software, which is inconvenient for the user to use.

Therefore, some notebook computers use a variable resistor (Variable Resistor) to adjust the volume, but the volume control of the analog mode is not related to the volume level set by the software, which causes the user to adjust the variable resistor. And the software interface to get the maximum volume.

In addition, the variable resistor also has a limitation on the number of revolutions or the amplitude, and is prone to failure due to poor contact after long-term use, which causes inconvenience in use.

In view of the above problems, the present disclosure provides a volume control apparatus and method for achieving rapid volume adjustment, and can change the volume adjustment mode and the volume adjustment interval according to whether or not the earphone is coupled to increase the usability.

A volume control device of the present disclosure is suitable for a portable electronic device. The volume control device includes a signal generating unit, a detecting unit and a control unit. The signal generating unit is configured to generate a forward pulse signal and a negative pulse wave according to the rotation operation of the user. Signal. The detecting unit is configured to detect whether the volume control device is coupled to the earphone, and accordingly generate a detection signal. The control unit is coupled to the signal generating unit and the detecting unit for determining the first volume adjustment mode or the second volume adjustment mode according to the detection signal, and according to the first volume adjustment mode and the forward pulse signal or the negative pulse The first control signal is generated by the wave signal, or the second control signal is generated according to the second volume adjustment mode and the forward pulse signal or the negative pulse signal, so that the portable electronic device is based on the first control signal or the first The second control signal is used for volume adjustment.

In an embodiment, the signal generating unit includes a knob, a first switch, a second switch, a first resistor, a second resistor, and an inverter. The knob is used to rotate by the user's operation. The first switch is coupled between the control unit and the ground for generating a switching operation according to the clockwise rotation of the knob to generate a forward pulse signal. The second switch is coupled between the control unit and the ground for generating a switching operation according to the knob rotating counterclockwise to generate a pulse signal. The first end of the first resistor receives the operating voltage, and the second end of the first resistor is coupled to the first switch. The first end of the second resistor receives the operating voltage, and the second end of the second resistor is coupled to the second switch. The inverter is coupled between the control unit and the second switch for inverting the pulse signal to generate a negative pulse signal.

In an embodiment, the detecting unit includes a connection port, a third resistor, a transistor, and a fourth resistor. The port is adapted to couple the earphones. The first end of the third resistor is coupled to the connection port. The gate terminal of the transistor is coupled to the second end of the third resistor, and the source terminal of the transistor is coupled to the ground terminal, and the detecting terminal of the transistor generates a detection signal. The first end of the fourth resistor receives the operating voltage, and the second end of the fourth resistor is coupled to the drain terminal of the transistor.

In an embodiment, the first volume adjustment mode is a volume control device uncoupled The second volume adjustment mode is coupled to the volume control device, and the volume adjustment interval of the first volume adjustment mode is greater than the volume adjustment interval of the second volume adjustment mode.

In an embodiment, the control unit further counts the number of pulses of the forward pulse wave signal and the duration of the forward pulse wave signal or the number of pulse waves of the negative pulse wave signal and the duration of the negative pulse wave signal, and The control unit is based on the first volume adjustment mode, the number of pulses of the forward pulse wave signal and the duration of the forward pulse wave signal, or the number of pulse waves and the negative pulse wave according to the first volume adjustment mode, the negative pulse signal The duration of the signal, and the first control signal is generated correspondingly by way of table lookup; or the control unit is based on the second volume adjustment mode, the number of pulses of the forward pulse wave signal, and the duration of the forward pulse wave signal, or According to the second volume adjustment mode, the number of pulse waves of the negative pulse wave signal and the duration of the negative pulse wave signal, and correspondingly generating the second control signal by means of look-up table.

In an embodiment, the aforementioned control unit includes a timer, a counter, and a processor. The timer is coupled to the signal generating unit for timing the forward pulse signal and the negative pulse signal to output the duration of the forward pulse signal or the duration of the negative pulse signal. The counter is coupled to the signal generating unit for counting the forward pulse signal or the negative pulse signal to output the pulse wave number of the forward pulse wave signal or the pulse wave number of the negative pulse wave signal. The processor is coupled to the timer, the counter and the detecting unit for receiving the pulse wave of the forward pulse wave signal and the duration of the forward pulse wave signal or the number of the pulse wave of the negative pulse wave signal and the negative pulse wave signal. Duration, and the processor is based on the first volume adjustment mode, the number of pulses of the forward pulse wave signal, and the positive pulse wave signal. The duration, or according to the first volume adjustment mode, the number of pulse waves of the negative pulse signal and the duration of the negative pulse signal, and correspondingly generate the first control signal by means of table lookup; or the processor according to the The second volume adjustment mode, the number of pulses of the forward pulse signal and the duration of the forward pulse signal, or the duration of the negative volume signal and the duration of the negative pulse signal according to the second volume adjustment mode, the negative pulse signal And correspondingly generating a second control signal by means of looking up the table.

The present disclosure provides a volume control method including the following steps. Receiving a forward pulse signal or a negative pulse signal, wherein the forward pulse signal or the negative pulse signal is generated according to a user's rotation operation. Detecting whether a headset is coupled to generate a detection signal. The first volume adjustment mode or the second volume adjustment mode is determined according to the detection signal. Generating a first control signal according to the first volume adjustment mode and the forward pulse signal or the first volume adjustment mode and the negative pulse signal, or according to the second volume adjustment mode and the forward pulse signal or the first volume adjustment The mode and the negative pulse signal generate a second control signal. The volume adjustment is performed according to the first control signal or the second control signal.

In an embodiment, the first volume adjustment mode is that the volume control device is not coupled to the earphone, and the second volume adjustment mode is that the volume control device is coupled to the earphone, and the volume adjustment interval of the first volume adjustment mode is greater than the second volume adjustment. The volume of the mode adjusts the spacing.

In an embodiment, the step of generating the first control signal or the second control signal includes counting the number of pulses of the forward pulse wave signal and the duration of the forward pulse wave signal or the number of the pulse wave of the negative pulse wave signal and The duration of the negative pulse signal, and then According to the first volume adjustment mode, the number of pulse waves of the forward pulse wave signal and the duration of the forward pulse wave signal, or according to the first volume adjustment mode, the number of pulse waves of the negative pulse wave signal, and the negative pulse wave signal The duration, and the first control signal is generated correspondingly by the look-up table; or according to the second volume adjustment mode, the number of pulses of the forward pulse wave signal and the duration of the forward pulse wave signal, or according to the second volume Adjusting the mode, the number of pulses of the negative pulse signal and the duration of the negative pulse signal, and correspondingly generating the second control signal by means of look-up table.

The volume control device and method of the present disclosure can quickly adjust the volume by using a forward pulse signal or a negative pulse signal generated according to a user's rotation operation, and further determine whether the earphone is coupled, thereby changing the volume adjustment. Mode and volume adjustment spacing. In this way, in addition to speeding up the volume adjustment speed, it is also possible to avoid using the same volume to adjust the spacing, which is likely to cause a sudden or large sudden sound.

The features and implementations of the present disclosure are described in detail below with reference to the drawings.

Please refer to "Figure 1" for a circuit diagram of the volume control device disclosed herein. The volume control device 100 of this embodiment is suitable for volume adjustment of a portable electronic device (such as a notebook computer, a tablet computer, etc.). The volume control device 100 includes a signal generating unit 110, a detecting unit 120, and a control unit 130. The signal generating unit 110 is configured to generate a forward pulse signal S1 and a negative pulse signal S2 according to a rotation operation of the user.

Further, the signal generating unit 110 includes a knob 111, a first switch SW1, a second switch SW2, a first resistor R1, a second resistor R2, and an inverter 112. The knob 111 is used to rotate by a user's operation, for example, in a clockwise or counterclockwise direction. The first switch SW1 is coupled between the control unit 130 and the ground GND for generating a switching operation according to the clockwise rotation of the knob 111 to generate a forward pulse signal S1.

The second switch SW2 is coupled between the control unit 130 and the ground GND for generating a switching operation according to the knob 111 rotating counterclockwise to generate the pulse signal S2'. The first end of the first resistor R1 receives the operating voltage VDD, and the second end of the first resistor R1 is coupled to the first switch SW1. The first end of the second resistor R2 receives the operating voltage VDD, and the second end of the second resistor R2 is coupled to the second switch SW2. The inverter 112 is coupled between the control unit 130 and the second switch SW1 for inverting the pulse signal S2' to generate a negative pulse signal S2.

In the embodiment, when the knob 111 rotates clockwise, the knob 111 drives the first switch SW1 to switch, so that the first switch SW1 is turned on and then turned off to generate the forward pulse signal S1. For example, when the knob 111 rotates to drive the first switch SW1 to switch once (that is, the first switch SW1 is turned on and then off once), the forward pulse signal S1 will have 1 pulse wave, and the knob 111 rotates. When the first switch SW2 is switched twice (that is, the first switch SW1 is turned on and then turned off twice), the forward pulse signal S1 will have 2 pulse waves, and the rest will be analogized.

When the knob 111 rotates counterclockwise, the knob 111 drives the second switch SW2 to switch, so that the second switch SW2 is turned on and then turned off to generate a pulse wave signal. S2’. For example, if the knob 111 rotates to drive the second switch SW1 to switch once (that is, the second switch SW2 is turned on and then off once), the pulse signal S2' will have 1 pulse wave, and the knob 111 rotates to drive the first When the two switches SW2 are switched once (that is, the second switch SW2 is turned on and then turned off twice), the pulse signal S2' will have 2 pulse waves, and the rest will be analogized. In this way, the user can rotate the knob 111 to generate a positive pulse signal S1 and a negative pulse signal S2 of different numbers of pulse waves.

The detecting unit 120 is configured to detect whether the audio control device 100 is coupled to a headset, that is, to detect whether the user inserts the earphone into the portable electronic device, thereby generating the detection signal VD. For example, when the detecting unit 120 detects that the audio control device 100 is not coupled to the earphone, the detecting unit 120 generates a detection signal VD of, for example, a high logic level. When the detecting unit 120 detects that the audio control device 100 is coupled to the earphone, the detecting unit 120 generates, for example, a low logic level detection signal VD.

Further, the detecting unit 120 includes a connection port 121, a third resistor R3, a transistor M1 and a fourth resistor R4. The port 121 is adapted to couple to the earphone. The first end of the third resistor R3 is coupled to the connection port 121. The gate terminal of the transistor M1 is coupled to the second terminal of the third resistor R3, the source terminal of the transistor M1 is coupled to the ground terminal GND, and the detection terminal of the transistor M1 generates the detection signal VD. The first end of the fourth resistor R4 receives the operating voltage VDD, and the second end of the fourth resistor R4 is coupled to the 汲 terminal of the transistor M1.

When the connection port 121 is not coupled to the earphone, the gate terminal of the transistor M1 receives the signal of the low logic pole level through the third resistor R3, so that the transistor M1 is not turned on. Since the transistor M1 is not turned on, the detection signal VD is converted to a high logic level. When the connection port 121 is coupled to the earphone, the gate terminal of the transistor M1 is connected through the third resistor R3. The signal of the logic level is raised to make the transistor M1 turn on. Since the transistor M1 is turned on, the second end of the fourth resistor R4 is coupled to the ground GND via the transistor M1, so that the detection signal VD is converted to a low logic level.

The control unit 130 is coupled to the signal generating unit 110 and the detecting unit 120 for receiving the forward pulse signal S1, the negative pulse signal S2 and the detection signal VD, and determining the first volume adjustment according to the detection signal VD. a mode or a second volume adjustment mode, and generating a first control signal CS1 according to the first volume adjustment mode and the forward pulse signal S1 or the first volume adjustment mode and the negative pulse signal S2, or according to the second volume adjustment The mode and the forward pulse signal S1 or the second volume adjustment mode and the negative pulse signal S2 generate a second control signal CS2, so that the portable electronic device 100 performs the first control signal CS1 and the second control signal CS2. Volume adjustment.

In this embodiment, the first volume adjustment mode is that the volume control device 100 is not coupled to the earphone, and the second volume adjustment mode is that the volume control device 100 is coupled to the earphone. That is, when the control unit 130 receives the detection signal VD of the high logic level, the control unit 130 switches to the first volume adjustment mode to perform volume adjustment, and when the control unit 130 receives the low logic level. When the signal VD is detected, the control unit 130 switches to the second volume mode to perform volume adjustment. In addition, the control unit 130 also counts the number of pulse waves of the forward pulse wave signal S1 and the duration of the forward pulse wave signal S1 or the number of pulse waves of the negative pulse wave signal S2 and the duration of the negative pulse wave signal S2.

Next, the control unit 130 according to the first volume adjustment mode and the pulse wave number of the forward pulse wave signal S1 and the pulse wave number of the forward pulse wave signal S1, or according to The first volume adjustment mode, the number of pulse waves of the negative pulse signal S2, and the duration of the negative pulse signal S2, and correspondingly generate the first control signal CS1 in a manner of looking up the table. Alternatively, the control unit 130 according to the second volume adjustment mode and the pulse wave number of the forward pulse wave signal S1 and the pulse wave number duration of the forward pulse wave signal S1, or according to the second volume adjustment mode and the negative pulse wave signal The number of pulses of S2 and the duration of the negative pulse signal S2, and correspondingly generate a second control signal CS2 in a manner of looking up the table.

Further, the control unit 130 includes a timer 131, a counter 132, and a processor 133. The timer 131 is coupled to the signal generating unit 110 for timing the forward pulse signal S1 and the negative pulse signal S2 to output the duration of the forward pulse signal S1 or the duration of the negative pulse signal S2. . The counter 132 is coupled to the signal generating unit 110 for counting the forward pulse signal S1 or the negative pulse signal S2 to output the pulse wave of the forward pulse signal S1 or the pulse wave of the negative pulse signal S2. Quantity.

The processor 133 is coupled to the timer 131, the counter 132, and the detecting unit 120 for receiving the number of pulses of the detection signal VD and the forward pulse signal S1 and the duration or the number of pulses of the negative pulse signal S2. duration. Moreover, the processor 133 is configured according to the first volume adjustment mode, the number of pulses of the forward pulse signal S1, and the duration of the forward pulse signal S1, or the pulse according to the first volume adjustment mode and the negative pulse signal S2. The quantity and the duration of the negative pulse signal S2 are correspondingly generated by the look-up table to generate the first control signal CS1.

Alternatively, the processor 133 adjusts according to the second volume adjustment mode, the number of pulses of the forward pulse signal S1, and the duration of the forward pulse signal S1, or according to the second volume adjustment. The mode, the number of pulse waves of the negative pulse signal S2 and the duration of the negative pulse signal S2, and correspondingly generate the second control signal CS2 in a manner of looking up the table.

In this embodiment, the volume adjustment interval of the first volume adjustment mode is greater than the volume adjustment interval of the second volume adjustment mode, for example, and the volume control device 100 can generate different levels of rotation speed according to the knob 111, and there is a corresponding volume adjustment. .

For example, the volume adjustment device 100 performs the volume adjustment in the first volume adjustment mode as an example. It is assumed that the number of pulse waves of the forward pulse wave signal S1 is greater than 20, and the duration of the forward pulse wave signal S1 is T, indicating the knob. The rotation speed of 111 is fast, and the processor 133 corresponds to the first control signal CS1 that produces a large (for example, 10%) volume adjustment. Assume that the pulse wave of the forward pulse signal S1 is between 10 and 20, and the duration of the forward pulse signal S1 is T, indicating that the rotation speed of the knob 111 is medium, the processor 133 will generate correspondingly. The first control signal CS1 of the volume adjustment of medium amplitude (for example, 2% to 9%).

Assuming that the number of pulses of the forward pulse signal S1 is less than 10, and the duration of the forward pulse signal S1 is T, indicating that the rotational speed of the knob 111 is slow, the processor 133 will generate a minimum amplitude (for example, 1%) The first control signal CS1 of the volume adjustment. The reverse pulse signal S2 can be referred to the analogy of the foregoing description, and therefore will not be described here.

In addition, the volume adjustment device 100 performs volume adjustment in the second volume adjustment mode as an example, and assumes that the number of pulse waves of the forward pulse wave signal S1 is greater than 20, and the duration of the forward pulse wave signal S1 is T, indicating that the knob 111 is If the rotation speed is fast, the processor 133 will respond to the second control signal that generates a large (for example, 5%) volume adjustment. No. CS2. Assume that the pulse wave of the forward pulse signal S1 is between 10 and 20, and the duration of the forward pulse signal S1 is T, indicating that the rotation speed of the knob 111 is medium, the processor 133 will generate correspondingly. The second control signal CS2 of the medium amplitude (for example, 2% to 4%) volume adjustment.

Assuming that the number of pulses of the forward pulse signal S1 is less than 10, and the duration of the forward pulse signal S1 is T, indicating that the rotational speed of the knob 111 is slow, the processor 133 will generate a minimum amplitude (for example, 1%) The second control signal CS2 of the volume adjustment. The reverse pulse signal S2 can be referred to the analogy of the foregoing description, and therefore will not be described here. Moreover, the forward pulse signal S1 serves as a basis for increasing the volume, and the reverse pulse signal S2 serves as a basis for reducing the volume.

In this way, the volume control device 100 of the embodiment can speed up the volume adjustment when the user does not insert the earphone into the portable electronic device, and can also be used when the user inserts the earphone into the portable electronic device. Change the pitch of the volume adjustment to avoid using the same volume adjustment interval (that is, adjust the adjustment pitch of the volume of the speaker or speaker), which is easy to cause the sound to suddenly become large or suddenly small.

From the description of the foregoing embodiment, a volume control method can be summarized. Please refer to "Figure 2" for a flowchart of the volume control method disclosed herein. In step S210, a forward pulse signal or a negative pulse signal is received, wherein the forward pulse signal or the negative pulse signal is generated according to a rotation operation of the user. In step S220, it is detected whether the earphone is coupled to generate a detection signal.

In step S230, the first volume adjustment mode or the second volume adjustment mode is determined according to the detection signal. In step S240, according to the first volume adjustment mode and positive Generating a first control signal to the pulse signal or the first volume adjustment mode and the negative pulse signal, or according to the second volume adjustment mode and the forward pulse signal or the first volume adjustment mode and the negative pulse signal, And generating a second control signal. In step S250, the volume adjustment is performed according to the first control signal or the second control signal.

In addition, step S240 further includes counting the number of pulse waves of the forward pulse wave signal and the duration of the forward pulse wave signal or the number of pulse waves of the negative pulse wave signal and the duration of the negative pulse wave signal. Then, according to the first volume adjustment mode, the number of pulse waves of the forward pulse wave signal and the duration of the forward pulse wave signal, or according to the first volume adjustment mode, the number of pulse waves of the negative pulse wave signal, and the negative pulse wave The duration of the signal, and the first control signal is generated in a manner of looking up the table; or according to the second volume adjustment mode, the number of pulses of the forward pulse wave signal, and the duration of the forward pulse wave signal, or according to the The second volume adjustment mode, the number of pulse waves of the negative pulse wave signal, and the duration of the negative pulse wave signal, and corresponding to the second control signal by way of table lookup.

In this embodiment, the first volume adjustment mode is that the volume control device is not coupled to the earphone, and the second volume adjustment mode is that the volume control device is coupled to the earphone, and the volume adjustment interval of the first volume adjustment mode is greater than the second volume adjustment mode. The volume is adjusted to the pitch.

The volume control device and method of the embodiment of the present disclosure, which generates a forward pulse wave signal (that is, a pulse wave number and duration of a forward pulse wave signal) or a negative pulse wave signal according to a user rotation operation. (ie, the number and duration of the pulse wave of the negative pulse signal) to adjust the volume and further determine whether the earphone is coupled to change the volume adjustment mode and the volume adjustment interval. In this way, in addition to speed up the volume adjustment In addition to the overall speed, it is also possible to avoid using the same volume to adjust the spacing, which is likely to cause a sudden or large sudden sound.

The present disclosure is disclosed in the foregoing embodiments, and is not intended to limit the disclosure. Any subject matter of the present invention can be modified and retouched without departing from the spirit and scope of the disclosure. The scope of patent protection shall be subject to the definition of the scope of the patent application attached to this specification.

100‧‧‧Volume control unit

110‧‧‧Signal generating unit

111‧‧‧ knob

112‧‧‧ reverser

120‧‧‧Detection unit

121‧‧‧Links

130‧‧‧Control unit

131‧‧‧Timer

132‧‧‧ counter

133‧‧‧ processor

M1‧‧‧O crystal

R1‧‧‧first resistance

R2‧‧‧second resistance

R3‧‧‧ third resistor

R4‧‧‧fourth resistor

SW1‧‧‧ first switch

SW2‧‧‧second switch

GND‧‧‧ ground terminal

VDD‧‧‧ working voltage

CS1‧‧‧First control signal

CS2‧‧‧second control signal

VD‧‧‧ detection signal

S1‧‧‧ Forward pulse signal

S2‧‧‧negative pulse signal

S2’‧‧‧ pulse signal

Figure 1 is a circuit diagram of the volume control device of the present disclosure.

Figure 2 is a flow chart of the volume control method of the present disclosure.

100‧‧‧Volume control unit

110‧‧‧Signal generating unit

111‧‧‧ knob

112‧‧‧ reverser

120‧‧‧Detection unit

121‧‧‧Links

130‧‧‧Control unit

131‧‧‧Timer

132‧‧‧ counter

133‧‧‧ processor

M1‧‧‧O crystal

R1‧‧‧first resistance

R2‧‧‧second resistance

R3‧‧‧ third resistor

R4‧‧‧fourth resistor

SW1‧‧‧ first switch

SW2‧‧‧second switch

GND‧‧‧ ground terminal

VDD‧‧‧ working voltage

CS1‧‧‧First control signal

CS2‧‧‧second control signal

VD‧‧‧ detection signal

S1‧‧‧ Forward pulse signal

S2‧‧‧negative pulse signal

S2’‧‧‧ pulse signal

Claims (5)

A volume control device is adapted to be a portable electronic device. The volume control device includes a signal generating unit for generating a forward pulse signal or a negative pulse signal according to a user's rotating operation. a detection unit for detecting whether the volume control device is coupled to a headphone for generating a detection signal; and a control unit coupled to the signal generation unit and the detection unit for Detecting a signal, and determining a first volume adjustment mode or a second volume adjustment mode, and according to the first volume adjustment mode and the forward pulse signal or the first volume adjustment mode and the negative pulse signal, Generating a first control signal, or generating a second control signal according to the second volume adjustment mode and the forward pulse wave signal or the second volume adjustment mode and the negative pulse signal to enable the portability The electronic device performs volume adjustment according to the first control signal or the second control signal; wherein the signal generating unit comprises: a knob for rotating by the user's operation; a first switch Between the control unit and a ground, for generating a switching operation by clockwise rotation according to the knob to generate the forward pulse signal; a second switch coupled to the control unit and the Between the grounding ends, the switching operation is performed by rotating the knob counterclockwise to generate a pulse wave signal. a first resistor, the first end of which receives an operating voltage, the second end of which is coupled to the first switch; a second resistor, the first end of which receives the operating voltage, and the second end of which is coupled to the second And an inverter coupled between the control unit and the second switch for inverting the pulse signal to generate the negative pulse signal. The volume control device of claim 1, wherein the detecting unit comprises: a connecting port adapted to couple the earphone; a third resistor having a first end coupled to the connecting port; a transistor The gate terminal is coupled to the second end of the third resistor, the source terminal is coupled to a ground terminal, and the detecting terminal generates the detecting signal; and the fourth resistor receives a working voltage at the first end thereof. The two ends are coupled to the 汲 terminal of the transistor. The volume control device of claim 1, wherein the first volume adjustment mode is that the volume control device is not coupled to the earphone, and the second volume adjustment mode is that the volume control device is coupled to the earphone, and The volume adjustment interval of the first volume adjustment mode is greater than the volume adjustment interval of the second volume adjustment mode. The volume control device of claim 3, wherein the control unit further counts the number of pulses of the forward pulse wave signal and the duration of the forward pulse wave signal or the pulse wave of the negative pulse wave signal. Quantity and duration of the negative pulse signal Time, and the control unit is based on the first volume adjustment mode, the number of pulses of the forward pulse signal and the duration of the forward pulse signal, or according to the first volume adjustment mode, the negative pulse signal The number of pulses and the duration of the negative pulse signal, and correspondingly generating the first control signal in a look-up manner; or the control unit according to the second volume adjustment mode, the forward pulse signal The number of pulses and the duration of the forward pulse signal, or according to the second volume adjustment mode, the number of pulses of the negative pulse signal, and the duration of the negative pulse signal, and the lookup table The manner corresponding to the second control signal is generated. The volume control device of claim 1, wherein the control unit comprises: a timer coupled to the signal generating unit for timing the forward pulse signal or the negative pulse signal, The duration of the forward pulse signal or the duration of the negative pulse signal is output; a counter coupled to the signal generating unit for counting the forward pulse signal or the negative pulse signal And outputting the pulse wave number of the forward pulse wave signal or the pulse wave number of the negative pulse wave signal; and a processor coupled to the timer, the counter and the detecting unit for receiving the detecting The number of pulses of the signal and the forward pulse signal and the duration of the forward pulse signal, or the number of pulses of the negative pulse signal and the duration of the negative pulse signal, and the processor is based on The first volume adjustment mode, the number of pulses of the forward pulse signal, and the duration of the forward pulse signal, or the number of pulses according to the first volume adjustment mode, the negative pulse signal, and the negative Pulse The duration of the wave signal, and correspondingly generating the first control signal by means of a lookup table; or the processor according to the second volume adjustment mode, the number of pulse waves of the forward pulse wave signal, and the forward pulse The duration of the wave signal is based on the second volume adjustment mode, the number of pulses of the negative pulse wave signal, and the duration of the negative pulse wave signal, and the second control signal is correspondingly generated in the manner of the lookup table. .