CN118102170A - Electronic device with loudspeaker protection mechanism - Google Patents
Electronic device with loudspeaker protection mechanism Download PDFInfo
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- CN118102170A CN118102170A CN202211501924.0A CN202211501924A CN118102170A CN 118102170 A CN118102170 A CN 118102170A CN 202211501924 A CN202211501924 A CN 202211501924A CN 118102170 A CN118102170 A CN 118102170A
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Abstract
The electronic device includes a speaker, an amplifier circuit, a level shift circuit, a switch, and a processor. The speaker operates in accordance with the drive signal. The amplifier circuit receives an input signal provided by the processor and adjusts the input signal to provide a corresponding output signal. The level shift circuit is used for adjusting the output signal to provide a corresponding adjusted output signal. The switch selectively transmits the output signal to the loudspeaker according to an activating signal to provide a driving signal. The processor is used for detecting the real-time characteristic of the adjusted output signal and providing a starting signal according to the real-time characteristic of the adjusted output signal.
Description
Technical Field
The present invention relates to an electronic device, and more particularly, to an electronic device with a speaker protection mechanism.
Background
A speaker (speaker) is a device capable of converting an electronic signal into an acoustic signal, and typically includes a diaphragm (diaphragm) and a driving circuit consisting of an electromagnet and a voice coil. When a current corresponding to a speaker driving signal with a specific frequency flows through the voice coil, the voice coil vibrates along with the frequency of the current, and the vibrating diaphragm connected with the voice coil naturally vibrates along with the current, so that surrounding air is pushed to vibrate to generate sound.
In the prior art electronic device, the processor provides an input signal of the audio signal to be played by the speaker, and the input signal is amplified by the amplifier circuit to provide a driving signal to drive the speaker. In order to ensure that physical quantities (such as temperature, voltage, current, diaphragm displacement, etc.) of the loudspeaker can be within the bearing range, the electronic device in the prior art is provided with a protection circuit at the front end of the amplifier circuit, so that the input signal can be cut off when the input signal is detected to be abnormal, and the amplified abnormal driving signal is prevented from damaging the loudspeaker. However, if the amplifier circuit is set incorrectly, the normal input signal may be amplified to an abnormal output signal, so that the speaker may be damaged.
Therefore, there is a need for an electronic device that provides a more sophisticated speaker protection mechanism to reduce the risk of damage to the speaker.
Disclosure of Invention
The invention provides an electronic device with a loudspeaker protection mechanism, which comprises a loudspeaker, an amplifier circuit, a level shift circuit, a switch and a processor. The speaker operates according to a driving signal. The amplifier circuit is used for receiving an input signal and adjusting the input signal to provide a corresponding output signal. The level shift circuit is used for adjusting the output signal to provide a corresponding adjusted output signal. The switch is coupled between the amplifier circuit and the speaker for selectively transmitting the output signal to the speaker according to an enable signal to provide the driving signal. The processor is used for providing the input signal, detecting the real-time characteristic of the adjusted output signal, and providing the starting signal according to the real-time characteristic of the adjusted output signal.
Drawings
Fig. 1 is a functional block diagram of an electronic device with a speaker protection mechanism according to an embodiment of the present invention.
Fig. 2 is a functional block diagram of an electronic device with a speaker protection mechanism according to another embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating an implementation manner of a position shift circuit in an electronic device with a speaker protection mechanism according to an embodiment of the present invention.
Wherein reference numerals are as follows:
10: loudspeaker
20: Processor and method for controlling the same
22: Judging circuit
24: Switch control circuit
31. 32: Amplifier circuit
34: Detection circuit
36: Gain control circuit
40: Level shift circuit
50: Switch
100. 200: Electronic device
S IN: input signal
S+: output signal
S++'. Adjusted output signal
S OUT: drive signal
S MIC1、SMIC2: characteristic signal
S DIV: partial pressure signal
EN SW: switch control signal
GND: ground potential
R1-R2: resistor
C1: capacitance device
Detailed Description
Fig. 1 is a functional block diagram of an electronic device 100 with a speaker protection mechanism according to an embodiment of the invention. Fig. 2 is a functional block diagram of an electronic device 200 with a speaker protection mechanism according to another embodiment of the present invention. The electronic device 100 includes a speaker 10, a processor 20, an amplifier circuit 31, a level shift (LEVEL SHIFT) circuit 40, and a switch 50. The electronic device 200 includes a speaker 10, a processor 20, an amplifier circuit 32, a level shift circuit 40, and a switch 50.
In the electronic devices 100 and 200 of the present invention, the speaker 10 may be an electrodynamic (dynamic) speaker, an electromagnetic (electromagnet) speaker, a piezoelectric (piezo) speaker, an electrode (electrodynamic) speaker, and a plasma (plasma) speaker. In an embodiment, each speaker may be a woofer, subwoofer, midrange, tweeter, superrange, coaxial, and full range speaker. However, the type of speaker 10 does not limit the scope of the present invention.
In the electronic devices 100 and 200 of the present invention, the processor 20 may be a platform path controller (platform controller hub, PCH) or a digital signal processor (DIGITAL SIGNAL processor, DSP) for providing an input signal S IN of the sound signal to be played by the speaker 10. The amplifier circuits 31 and 32 can convert the input signal S IN into an output signal S+ and selectively transmit the output signal S+ to the speaker 10 through the switch 50 to provide a driving signal S OUT. In more detail, the amplifier circuits 31 and 32 may specifically gain adjust the input signal S IN, i.e. amplify the input signal S IN to provide a corresponding output signal s+.
In the electronic device 100 shown in fig. 1, the amplifier circuit 31 amplifies the input signal S IN with a predetermined fixed gain to provide the output signal s+.
In the electronic device 200 shown in fig. 2, the amplifier circuit 32 is a smart amplifier, which includes a detection circuit 34 and a gain control circuit 36. The input end of the detection circuit 34 is coupled between the speaker 10 and the switch 50 to receive the driving signal S OUT, and then detects the characteristic of the driving signal S OUT in real time to provide a corresponding characteristic signal S MIC2 at the output end thereof. In one embodiment, the characteristic signal S MIC2 includes information such as a voltage value, a current value, a power, a frequency response, and/or a gradient change of the driving signal S OUT.
The gain control circuit 36 is coupled to the processor 20 for receiving the input signal S IN, and coupled to the detection circuit 32 for receiving the characteristic signal S MIC2, and adjusts the gain of amplifying the input signal S IN according to the characteristic signal S MIC2. When the value of the characteristic signal S MIC2 is not within the expected range, it represents that the current driving signal S OUT is abnormal, and the loudspeaker 10 may be damaged due to the excessive vibration amplitude (excursion) of the diaphragm and/or the excessive temperature of the voice coil when the current driving signal S OUT is operated. In this case, the gain control circuit 36 will suppress the output signal s+ in real time, i.e. reduce the gain used to amplify the input signal S IN, so as to avoid damaging the loudspeaker 10.
In the electronic devices 100 and 200 of the present invention, the switch 50 can selectively transmit the output signal s+ to the speaker 10 according to an enable signal EN SW to provide the driving signal S OUT. In embodiments of the present invention, the switch 50 may comprise a metal-oxide-semiconductor field effect transistor (MOSFET), a bipolar junction transistor (bipolar junction transistor, BJT), or one or more other devices with similar functions, but is not limited thereto.
In the electronic devices 100 and 200 of the present invention, the input terminal of the level shift circuit 40 is coupled to the output terminal of the amplifier circuit 30 to receive the output signal s+, and the output terminal is coupled to the processor 20 to output an adjusted output signal s+'. The level shift circuit 40 is used for adjusting the output signal s+ to provide a corresponding adjusted output signal s+'. In one embodiment, the level shift circuit 40 converts the output signal S+ having the potential (e.g., 1V) of the speaker 10 into the adjusted output signal S++ having the potential (e.g., 0.5V) of the analog microphone, so that the processor 20 can perform signal processing on the adjusted output signal. In one embodiment, the level shift circuit 40 blocks the dc component in the output signal s+ so that the adjusted output signal s++ only includes the ac component.
Fig. 3 is a schematic diagram illustrating an implementation manner of the level shift circuit 40 in the electronic devices 100 and 200 according to the embodiment of the invention. The level shift circuit 40 may include resistors R1-R2 and a capacitor C1. The resistors R1 and R2 are connected in series between the input terminal of the level shift circuit 40 and a ground potential GND, and divide the output signal s+ to provide a divided signal S DIV, wherein S DIV =r2×s+/(r1+r2). The capacitor C1 has a first end coupled between the resistor R1 and the resistor R2 to receive the divided signal S DIV, and a second end coupled to the output end of the level shift circuit 40 to block the dc component of the divided signal S DIV to provide the adjusted output signal s++ including only the ac component. However, the circuit shown in fig. 3 is only an embodiment, and the implementation manner of the level shift circuit 40 is not limited to the scope of the present invention.
In the electronic devices 100 and 200 of the present invention, the processor 20 may include a judging circuit 22 and a switch control circuit 24. The determining circuit 22 can detect the characteristic of the adjusted output signal s+' in real time to provide the corresponding characteristic signal S MIC1 at its output terminal. In one embodiment, the characteristic signal S MIC1 includes information about the voltage value, the current value, the power, the frequency response, and/or the gradient change of the adjusted output signal S++.
In the electronic device 100 of the present invention, the switch control circuit 24 outputs the switch control signal EN SW with different potentials according to the characteristic signal S MIC1. When the value of the characteristic signal S MIC1 is within the expected range, it represents that the corresponding output signal s+ is normal, and the switch control circuit 24 outputs the switch control signal EN SW with the enable potential (e.g. high potential) to turn on the switch 50, and further transmits the output signal s+ to provide the related driving signal S OUT; when the value of the characteristic signal S MIC1 is not within the expected range, an abnormality occurs in the corresponding output signal s+ as the driving signal S OUT to the speaker 10 is also abnormal, which may be due to an abnormality in the input signal S IN at the front end of the amplifier circuit 31 or an abnormality in the output signal s+ at the rear end caused by a setting error of the amplifier circuit 31. In this case, if the speaker 10 is damaged due to the excessive vibration amplitude of the diaphragm and/or the excessive temperature of the voice coil when operating according to the current driving signal S OUT, the switch control circuit 24 outputs the switch control signal EN SW with the disable potential (e.g. low potential) to turn off the switch 50, and further turns off the output signal s+ to stop providing the driving signal S OUT.
In the electronic device 200 of the present invention, the switch control circuit 24 outputs the switch control signal EN SW with different potentials according to the characteristic signal S MIC1 and the characteristic signal S MIC2. When the values of the characteristic signal S MIC1 and the characteristic signal S MIC2 are within the respective expected ranges, the corresponding output signal s+ and the driving signal S OUT are normal, and the switch control circuit 24 outputs the switch control signal EN SW with the enable potential (e.g. high potential) to turn on the switch 50, so as to continuously transmit the output signal s+ to provide the relevant driving signal S OUT; when the value of the characteristic signal S MIC1 or the characteristic signal S MIC2 is not within the respective expected range, an abnormality occurs in the corresponding output signal s+ or the driving signal S OUT, which may be due to an abnormality in the input signal S IN at the front end of the amplifier circuit 32 or an abnormality in the output signal s+ at the rear end caused by a setting error of the amplifier circuit 32. In this case, if the speaker 10 is damaged due to the excessive vibration amplitude of the diaphragm and/or the excessive temperature of the voice coil when operating according to the current driving signal S OUT, the switch control circuit 24 outputs the switch control signal EN SW with the disable potential (e.g. low potential) to turn off the switch 50, and further turns off the output signal s+ to stop providing the driving signal S OUT.
In summary, the electronic device of the present invention sets a protection circuit (switch 50) at the rear end of the amplifier circuits 31 and 32 to cut off the transmission path of the output signal s+ when detecting that the output signal s+ or the driving signal S OUT is abnormal, and further stops providing the driving signal S OUT to avoid damaging the speaker 10. The electronic device can provide a perfect speaker protection mechanism no matter whether the input signal S IN at the front end of the amplifier circuit is abnormal or the output signal S+ at the rear end is abnormal due to the setting error of the amplifier circuit.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. An electronic device with speaker protection mechanism, comprising:
a speaker operating according to a driving signal;
an amplifier circuit for receiving an input signal and adjusting the input signal to provide a corresponding output signal;
A level shift circuit for adjusting the output signal to provide a corresponding adjusted output signal;
a switch coupled between the amplifier circuit and the speaker for selectively transmitting the output signal to the speaker according to an enable signal to provide the driving signal; and
A processor for:
providing the input signal;
Detecting the real-time characteristic of the adjusted output signal; and
The start signal is provided according to the real-time characteristic of the adjusted output signal.
2. The electronic device of claim 1, wherein the processor comprises:
The judging circuit is coupled to the level shifting circuit to receive the adjusted output signal, and is used for detecting the real-time characteristic of the adjusted output signal and outputting a first characteristic signal according to the real-time characteristic of the adjusted output signal; and
A switch control circuit coupled to the judging circuit for receiving the first characteristic signal for:
Outputting the start signal with an enabling potential to turn on the switch when the value of the first characteristic signal is within an expected range; and
When the value of the first characteristic signal is not in the expected range, the starting signal with a disable potential is output to cut off the switch.
3. The electronic device according to claim 2, wherein the first characteristic signal comprises information related to a voltage value, a current value, a power, a frequency response and/or a gradient change of the adjusted output signal.
4. The electronic device of claim 1, wherein the amplifier circuit comprises:
The detection circuit is coupled between the loudspeaker and the switch to receive the driving signal, is used for detecting the real-time characteristic of the driving signal and provides a second characteristic signal according to the real-time characteristic of the driving signal; and
The gain control circuit is coupled to the processor to receive the input signal and coupled to the detection circuit to receive the second characteristic signal, and is used for adjusting the gain of amplifying the input signal according to the second characteristic signal.
5. The electronic device of claim 4, wherein the second characteristic signal comprises information related to a voltage value, a current value, a power, a frequency response and/or a gradient change of the driving signal.
6. The electronic device of claim 4, wherein the processor comprises:
The judging circuit is coupled to the level shifting circuit to receive the adjusted output signal, and is used for detecting the real-time characteristic of the adjusted output signal and outputting a first characteristic signal according to the real-time characteristic of the adjusted output signal; and
A switch control circuit coupled to the judging circuit for receiving the first characteristic signal and coupled to the detecting circuit for receiving the second characteristic signal for:
Outputting the start signal with an enabling potential to turn on the switch when the value of the first characteristic signal is within a first expected range and when the value of the second characteristic signal is within a second expected range; and
When the value of the first characteristic signal is not in the first expected range, and when the value of the second characteristic signal is not in the second expected range, the starting signal with a disable potential is output to cut off the switch.
7. The electronic device of claim 1, wherein the level shift circuit is further configured to adjust a potential of the output signal to provide the adjusted output signal.
8. The electronic device of claim 7, wherein the level shift circuit is further configured to block a dc component of the output signal to provide the adjusted output signal comprising only an ac component.
9. The electronic device of claim 1, wherein the level shift circuit comprises:
A first resistor, comprising:
a first terminal coupled between the amplifier circuit and the switch for receiving the output signal; and
A second end;
a second resistor, comprising:
a first end coupled to the second end of the first resistor; and
A second terminal coupled to a ground potential; and
A capacitor, comprising:
A first end coupled to the second end of the first resistor and the first end of the second resistor; and
A second end coupled to the processor for outputting the adjusted output signal.
10. The electronic device of claim 1, wherein the processor is a platform path controller or a digital signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211501924.0A CN118102170A (en) | 2022-11-28 | 2022-11-28 | Electronic device with loudspeaker protection mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211501924.0A CN118102170A (en) | 2022-11-28 | 2022-11-28 | Electronic device with loudspeaker protection mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118102170A true CN118102170A (en) | 2024-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211501924.0A Pending CN118102170A (en) | 2022-11-28 | 2022-11-28 | Electronic device with loudspeaker protection mechanism |
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| Country | Link |
|---|---|
| CN (1) | CN118102170A (en) |
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2022
- 2022-11-28 CN CN202211501924.0A patent/CN118102170A/en active Pending
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