CN203596901U - Audio player - Google Patents
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- CN203596901U CN203596901U CN201320747217.XU CN201320747217U CN203596901U CN 203596901 U CN203596901 U CN 203596901U CN 201320747217 U CN201320747217 U CN 201320747217U CN 203596901 U CN203596901 U CN 203596901U
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- 238000001514 detection method Methods 0.000 claims abstract description 104
- 230000005236 sound signal Effects 0.000 claims abstract description 40
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Abstract
The utility model discloses an audio player, comprising a power amplifier, a controller, an audio detection circuit and a loudspeaker. The audio detection circuit comprises an audio filtering module, a switch module and a signal detection module. The audio player filters AC components in audio signals through the audio filtering module; the switch module selects an on or off state in dependence on the voltage difference between two output terminals of the audio filtering module; the signal detection module detects whether the audio signals contain AC components in dependence on the on and off states of the switch module, and outputs detection signals to the controller in dependence on detection results to control work states of the power amplifier, and accordingly when the switch module is on, the signal detection module detects that the audio signals contain AC components, and outputs corresponding detection signals to the controller so as to control the power amplifier to stop outputting audio signals, thereby avoiding damage to the loudspeaker caused by AC components in the audio signals outputted by the power amplifier.
Description
Technical Field
The utility model relates to an electronic equipment technical field especially relates to an audio playback equipment.
Background
In an audio playing device, an audio signal output to a speaker by a power amplifier is required to be a pure alternating current signal, and a direct current component cannot exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an audio playback device aims at avoiding having the direct current composition in the audio signal of power amplifier output and arousing the speaker to damage.
In order to achieve the above object, the utility model provides an audio playback device, including the speaker, with the speaker is connected, be used for to the power amplifier of speaker output audio signal, this audio playback device still include with the controller that power amplifier connects and be used for detecting audio signal's audio detection circuitry, audio detection circuitry includes:
the audio frequency filtering module is used for filtering alternating current components in an audio frequency signal, the switch module is used for selecting on or off according to the voltage difference between two output ends of the audio frequency filtering module, and the signal detection module is used for outputting a detection signal according to the on-off state of the switch module; the controller controls the working state of the power amplifier according to the detection signal; wherein,
two input ends of the audio filtering module are respectively connected with a positive voltage end and a negative voltage end of the loudspeaker, and two output ends of the audio filtering module are respectively connected with two input ends of the switch module; the input end of the signal detection module is connected with the output end of the switch module, and the detection signal output end of the signal detection module is connected with the audio detection end of the controller.
Preferably, the number of the speakers is one, and the audio filtering module comprises a first capacitor, a voltage dividing resistor and two sampling resistors;
the positive voltage end of the loudspeaker is connected with the negative voltage end through the sampling resistor, the divider resistor and the other sampling resistor in sequence;
the first capacitor is connected with the divider resistor in parallel, and two ends of the first capacitor are respectively connected with two input ends of the switch module.
Preferably, the switching module includes a first switching element and a second switching element;
the control end of the first switch element is connected with the first end of the first capacitor, the first end of the first switch element is connected with the second end of the first capacitor, and the second end of the first switch element is connected with the input end of the signal detection module;
the control end of the second switch element is connected with the second end of the first capacitor, the first end of the second switch element is connected with the first end of the first capacitor, and the second end of the second switch element is connected with the input end of the signal detection module.
Preferably, the first switching element is a first NPN transistor, and the second switching element is a second NPN transistor;
a base electrode of the first NPN triode is a control end of the first switching element, an emitter electrode of the first NPN triode is a first end of the first switching element, and a collector electrode of the first NPN triode is a second end of the first switching element;
the base electrode of the second NPN triode is the control end of the second switching element, the emitter electrode of the second NPN triode is the first end of the second switching element, and the collector electrode of the second NPN triode is the second end of the second switching element.
Preferably, the signal detection module includes a first power input terminal, a second power input terminal, a third switching element, a fourth switching element, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a detection signal output terminal;
one end of the first resistor is connected with the second end of the first switch element, the other end of the first resistor is connected with the control end of the fourth switch element, and the first resistor is connected with the first end of the fourth switch element through the second capacitor;
a control end of the fourth switching element is connected with the second power input end through the fourth resistor, a first end of the fourth switching element is connected with the second power input end, and a second end of the fourth switching element is grounded through the fifth resistor and the second resistor in sequence;
a control end of the third switching element is connected with a common end of the fifth resistor and the second resistor, a second end of the third switching element is connected with the detection signal output end and is connected with the first power input end through the third resistor, and a first end of the third switching element is grounded; the detection signal output end is connected with the audio detection end of the controller.
Preferably, the third switching element is a third NPN transistor, and the fourth switching element is a PNP transistor;
a base electrode of the third NPN triode is a control end of the third switching element, an emitter electrode of the third NPN triode is a first end of the third switching element, and a collector electrode of the third NPN triode is a second end of the third switching element;
the base electrode of the PNP triode is the control end of the fourth switching element, the emitter electrode of the PNP triode is the first end of the fourth switching element, and the collector electrode of the PNP triode is the second end of the fourth switching element.
Preferably, the first switching element is a first PNP triode, and the second switching element is a second PNP triode;
the base electrode of the first PNP triode is the control end of the first switching element, the emitter electrode of the first PNP triode is the first end of the first switching element, and the collector electrode of the first PNP triode is the second end of the first switching element;
the base electrode of the second PNP triode is the control end of the second switch element, the emitter electrode of the second PNP triode is the first end of the second switch element, and the collector electrode of the second PNP triode is the second end of the second switch element.
Preferably, the signal detection module includes a first power input terminal, a third switching element, a second capacitor, a first resistor, a second resistor, a third resistor, and a detection signal output terminal;
one end of the first resistor is connected to the second end of the first switching element; the other end of the first resistor is connected with the control end of the first switching element, is grounded through the first capacitor and is grounded through the first resistor;
a second end of the third switching element is connected with the detection signal output end and the first power input end through the third resistor, and a first end of the switching element is grounded; the detection signal output end is connected with the audio detection end of the controller.
Preferably, the third switching element is an NPN transistor;
the base of the NPN triode is the control end of the third switching element, the emitter of the NPN triode is the first end of the third switching element, and the collector of the NPN triode is the second end of the third switching element.
Preferably, the number of the speakers is plural, the audio filtering module includes a first capacitor, a voltage dividing resistor and a plurality of sampling resistors, and a positive voltage terminal of each speaker is connected to a negative voltage terminal thereof through one sampling resistor, the voltage dividing resistor and another sampling resistor in sequence; the first capacitor is connected with the divider resistor in parallel, and two ends of the first capacitor are respectively connected with two input ends of the switch module.
The utility model provides an audio playback equipment, through the alternating current composition filtering of audio frequency filtering module in to audio signal, the voltage difference between two outputs of switch module according to audio frequency filtering module selects to switch on or turn-off, and signal detection module detects out audio signal according to switch module's break-make state and whether contains the direct current composition to output detected signal to controller according to the testing result, with control power amplifier's operating condition. When the signal detection module detects that the audio signal contains the direct current component, the corresponding detection signal is output to the controller, the power amplifier is controlled by the controller to stop outputting the audio signal, and the loudspeaker is prevented from being damaged due to the direct current component in the audio signal output by the power amplifier.
Drawings
Fig. 1 is a schematic block diagram of a preferred embodiment of the audio playback device of the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of the audio detection circuit of FIG. 1;
fig. 3 is a schematic circuit diagram of another embodiment of the audio detection circuit in fig. 1.
The objects, features and advantages of the present invention will be realized by the embodiments and will be further described with reference to the accompanying drawings.
Detailed Description
The technical solution of the present invention is further explained below with reference to the drawings and the specific embodiments of the specification. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides an audio playing device.
Referring to fig. 1, fig. 1 is a schematic block diagram of a preferred embodiment of the audio playing device of the present invention.
In the preferred embodiment of the present invention, the audio playing device includes a power amplifier 110, a controller 120, an audio detection circuit 130 and a speaker 140, the power amplifier 110 is connected to the speaker 140 for outputting audio signals to the speaker 140, the controller 120 is connected to the power amplifier 110 for controlling the operating status of the power amplifier 110, and the audio detection circuit 130 is connected to the controller 120 and the speaker 140 respectively.
The audio detection circuit 130 includes an audio filtering module 131, a switching module 132, and a signal detection module 133.
The audio filtering module 131 is configured to filter an alternating current component in an audio signal in a low-pass RC filtering manner, two input ends of the audio filtering module 131 are respectively connected to a positive voltage end and a negative voltage end of the speaker 140, two output ends of the audio filtering module 131 are respectively connected to two input ends of the switching module 132, and the switching module 131 is selectively turned on or off according to a voltage difference between two output ends of the audio filtering module 131; the input terminal of the signal detection module 133 is connected to the output terminal of the switch module 132, and the output terminal of the signal detection module 133 is connected to the audio detection terminal of the controller 120. The signal detection module 133 is configured to detect whether the audio signal contains a dc component according to the on/off state of the switch module 132, and output a detection signal according to the detection result, and the controller 120 controls the operating state of the power amplifier 110 according to the detection signal.
If the audio signal received by the positive voltage terminal and the negative voltage terminal of the speaker 140 has no dc component, the positive voltage and the negative voltage outputted by the audio filtering module 131 are equal. If the audio signal received by the positive voltage terminal and the negative voltage terminal of the speaker 140 has a dc component, a voltage difference exists between the positive voltage and the negative voltage outputted by the audio filtering module 131. If the voltage difference between the positive voltage and the negative voltage reaches the on threshold voltage of the switch module 132, the switch module 132 is turned on, and at this time, the signal detection module 133 detects that the audio signal contains a dc component and outputs a low-level detection signal to the controller 120, and the controller 120 controls the power amplifier 110 to stop outputting the audio signal after receiving the low-level detection signal. Compared with the prior art, the utility model discloses an audio playback equipment, through the alternating current composition filtering of audio frequency filter module 131 in to audio signal, switch module 132 selects to switch on or turn-off according to the voltage difference between two outputs of audio frequency filter module 131, and signal detection module 133 detects out audio signal according to switch module 132's break-make state whether contains the direct current composition to output detected signal to controller 120 according to the testing result, with control power amplifier 110's operating condition. When the switch module 132 is turned on, the signal detection module 133 detects that the audio signal contains a dc component and outputs a corresponding detection signal to the controller 120, so as to control the power amplifier 110 to stop outputting the audio signal through the controller 120, thereby preventing the speaker 140 from being damaged due to the dc component in the audio signal output by the power amplifier 120. Meanwhile, the power supply of the power amplifier 110 can be cut off by the controller 120, so that the power amplifier 110 and the speaker 140 are prevented from being damaged.
Referring to fig. 1 and fig. 2 together, fig. 2 is a schematic circuit diagram of an embodiment of the audio detection circuit in fig. 1.
In this embodiment, the audio filtering module 131 includes a first capacitor C1, a voltage dividing resistor RD, and at least two sampling resistors RS1 and RS 2;
the positive voltage terminal of the speaker 140 is connected to the negative voltage terminal of the speaker 140 through the sampling resistor RS1, the voltage dividing resistor RD and the sampling resistor RS2 in sequence. The first capacitor C1 is connected in parallel with the voltage dividing resistor RD. In the present embodiment, the sampling resistors RS1 and RS2 and the first capacitor C1 form an RC filter. Two ends of the first capacitor C1 are respectively connected to two input ends of the switch module 131.
In the present embodiment, the number of the speakers 140 may be one or more. When there is one speaker 140, the power amplifier 110 outputs one audio signal, and the audio filtering module 131 includes two sampling resistors RS1 and RS 2. When the number of the speakers 140 is plural, the power amplifier 110 outputs a plurality of audio signals, and the audio filtering module 131 includes a plurality of sampling resistors. The positive voltage terminal of each speaker 140 is connected to the negative voltage terminal through a sampling resistor, a voltage dividing resistor RD and another sampling resistor in sequence. As shown in fig. 2, the positive voltage terminal SP1+ of the first speaker is connected to the negative voltage terminal SP 1-via the sampling resistor RS1, the voltage dividing resistor RD and the sampling resistor RS2 in this order. The positive voltage terminal SP2+ of the second speaker is connected to the negative voltage terminal SP 2-via the sampling resistor RS3, the voltage dividing resistor RD and the sampling resistor RS4 in this order. By analogy, the positive voltage terminal SPn + of the nth speaker is sequentially connected to the negative voltage terminal SPn-through the sampling resistor RS2n-1, the voltage dividing resistor RD and the sampling resistor RS2 n. The number of paths of the output of the power amplifier 110 can be increased or decreased, and the number of sampling resistors in the audio filtering module 131 can be increased or decreased according to practical needs, which is not limited herein.
The switching module 132 includes a first switching element Q1 and a second switching element Q2.
A control terminal of the first switching element Q1 is connected to a first terminal of the first capacitor C1, a first terminal of the first switching element Q1 is connected to a second terminal of the first capacitor C1, and a second terminal of the first switching element Q1 is connected to an input terminal of the signal detection module 133.
A control terminal of the second switching element Q2 is connected to the second terminal of the first capacitor C1, a first terminal of the second switching element Q2 is connected to the first terminal of the first capacitor C1, and a second terminal of the second switching element Q2 is connected to the input terminal of the signal detection module 133.
In fig. 2, the first switching element Q1 is a first NPN transistor, and the second switching element Q2 is a second NPN transistor.
A base electrode of the first triode is a control end of the first switching element Q1, an emitter electrode of the first triode is a first end of the first switching element Q1, and a collector electrode of the first triode is a second end of the first switching element Q1; the base of the second transistor is the control terminal of the second switching element Q2, the emitter of the second transistor is the first terminal of the second switching element Q2, and the collector of the second transistor is the second terminal of the second switching element Q2.
As shown in fig. 2, the signal detection module 133 includes a first power input terminal VCC, a second power input terminal PVDD, a third switching element Q3, a fourth switching element Q4, a second capacitor C2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a detection signal output terminal VDET. The second power supply input PVDD may be connected to a power supply of the power amplifier 110.
One end of the first resistor R1 is connected to the second end of the first switching element Q1 and also to the second end of the second switching element Q2, and the other end of the first resistor R1 is connected to the control end of the fourth switching element Q4 and also to the first end of the fourth switching element Q4 via the second capacitor C2.
A control terminal of the fourth switching element Q4 is connected to the second power input terminal PVDD via a fourth resistor R4, a first terminal of the fourth switching element Q4 is connected to the second power input terminal PVDD, and a second terminal of the fourth switching element Q4 is grounded via a fifth resistor R5 and a second resistor R2 in this order.
A control terminal of the third switching element Q3 is connected to a common terminal of the fifth resistor R5 and the second resistor R2, a second terminal of the third switching element Q3 is connected to the detection signal output terminal VDET and also to the first power supply input terminal VCC via the third resistor R3, and a first terminal of the third switching element Q3 is grounded; the detection signal output terminal VDET is connected to the audio detection terminal of the controller 120.
In fig. 2, the third switching element Q3 is a third NPN transistor, and the fourth switching element Q4 is a PNP transistor. A base of the third NPN triode is a control terminal of the third switching element Q3, an emitter of the third NPN triode is a first terminal of the third switching element Q3, and a collector of the third NPN triode is a second terminal of the third switching element Q3; the base of the PNP triode is the control terminal of the fourth switching element Q4, the emitter of the PNP triode is the first terminal of the fourth switching element Q4, and the collector of the PNP triode is the second terminal of the fourth switching element Q4.
As shown in fig. 1 and fig. 2, the working principle of the audio playing device of the present invention is specifically described as follows: when the voltage difference between the positive and negative voltages outputted from the audio filtering module 131 (V1-V2) < Vbe and (V2-V1) < Vbe, Vbe is the voltage between the bases and the emitters of the first NPN transistor and the second NPN transistor, and both the first switching element Q1 and the second switching element Q2 are turned off. The voltage inputted from the second power input terminal PVDD is inputted to the control terminal of the fourth switching element Q4 (i.e., the base of the PNP triode) via the fourth resistor R4, i.e., the control terminal of the fourth switching element Q4 obtains a bias voltage through the fourth resistor R4, and the control terminal of the fourth switching element Q4 is at a high level, so that the fourth switching element Q4 is turned off. A control terminal of the third switching element Q3 (i.e., a base of the third NPN transistor) is grounded via the second resistor R2, and a control terminal of the third switching element Q3 is at a low level, so that the third switching element Q3 is turned off. Due to the pull-up action of the third resistor R3, the second terminal of the third switching element Q3 (i.e., the collector of the third NPN transistor) is at a high level, so that the detection signal output from the detection signal output terminal VDET to the audio detection terminal of the controller 120 is at a high level, the controller 120 detects the detection signal at the high level, and determines that the audio signal output from the power amplifier 110 to the speaker 140 does not contain a dc component, and the power amplifier 110 normally outputs the audio signal to the speaker 140.
When the voltage difference between the positive and negative voltages (V1-V2) is equal to or greater than Vbe, the first switching element Q1 is turned on, and the second switching element Q2 is turned off, at this time, the current signal in the circuit flows from the second power supply input terminal PVDD to the speaker 140 through the first switching element Q1; or when the voltage difference between the positive and negative voltages (V2-V1) is equal to or greater than Vbe, the first switching element Q1 is turned off, and the second switching element Q2 is turned on, at which time the current signal in the circuit flows from the second power supply input terminal PVDD to the speaker 140 through the second switching element Q2. In both cases, the fourth switching element Q4 is turned on and amplifies the current signal in the circuit, the voltage inputted from the second power input terminal PVDD is divided by the fifth resistor R5 and the second resistor R2 and inputted to the control terminal of the third switching element Q3, the control terminal of the third switching element Q3 is at a high level, the third switching element Q3 is turned on, therefore, the detection signal output to the audio detection terminal of the controller 120 through the detection signal output terminal VDET is at a low level, the controller 120 detects the detection signal at the low level, and determines that the audio signal output to the speaker 140 by the power amplifier 110 at this time contains a dc component, the controller 120 controls the power amplifier 110 to stop outputting the audio signal to the speaker 140, so as to prevent the speaker 140 from being damaged, and if the audio signal still contains the dc component, the controller 120 cuts off the power supply of the power amplifier 110, so as to prevent the power amplifier 110 and the speaker 140 from being damaged.
Referring to fig. 3 again, fig. 3 is a schematic circuit structure diagram of another embodiment of the audio detection circuit in fig. 1.
Unlike the circuit shown in fig. 2, in the switch module 132 shown in fig. 3, the first switch element Q1 is a first PNP transistor, and the second switch element Q2 is a second PNP transistor.
The base of the first PNP transistor is the control terminal of the first switching element Q1, the emitter of the first PNP transistor is the first terminal of the first switching element Q1, and the collector of the first PNP transistor is the second terminal of the first switching element Q1.
A base of the second PNP transistor is a control terminal of the second switching element Q2, an emitter of the second PNP transistor is a first terminal of the second switching element Q2, and a collector of the second PNP transistor is a second terminal of the second switching element Q2.
In fig. 3, the signal detection module 133 includes a first power input terminal VCC, a third switching element Q3, a second capacitor C2, a first resistor R1, a second resistor R2, a third resistor R3, and a detection signal output terminal VDET.
One end of the first resistor R1 is connected to the second end of the first switching element Q1 and also to the second end of the second switching element Q2, and the other end of the first resistor R1 is connected to the control end of the third switching element Q3, also to ground via the second capacitor C2, and also to ground via the second resistor R2.
A second terminal of the third switching element Q3 is connected to the detection signal output terminal VDET, and also connected to the first power input terminal VCC via a third resistor R3, and a first terminal of the third switching element Q3 is grounded; the detection signal output terminal VDET is connected to the audio detection terminal of the controller 120.
In fig. 3, the third switching element Q3 is an NPN transistor; a base of the NPN transistor is a control terminal of the third switching element Q3, an emitter of the NPN transistor is a first terminal of the third switching element Q3, and a collector of the NPN transistor is a second terminal of the third switching element Q3.
As shown in fig. 1 and fig. 3, the working principle of the audio playing device of the present invention is specifically described as follows:
when the voltage difference between the positive and negative voltages outputted from the audio filtering module 131 (V1-V2) < Vbe and (V2-V1) < Vbe, Vbe is the voltage between the base and source of the first PNP transistor and the second PNP transistor, and both the first switching element Q1 and the second switching element Q2 are turned off. Due to the pull-up action of the third resistor R3, the second terminal of the third switching element Q3 (i.e., the collector of the NPN transistor) is at a high level, so that the detection signal output from the detection signal output terminal VDET to the audio detection terminal of the controller 120 is at a high level, the controller 120 detects the high-level detection signal, and determines that the audio signal output from the power amplifier 110 to the speaker 140 does not contain a dc component, and the power amplifier 110 normally outputs the audio signal to the speaker 140.
When the voltage difference between the positive voltage and the negative voltage (V2-V1) is equal to or more than Vbe, the first switching element Q1 is turned on, the second switching element Q2 is turned off, and the current signal in the circuit flows from the loudspeaker 140 to the signal detection module 133 through the first switching element Q1; or when the voltage difference between the positive and negative voltages (V1-V2) is equal to or greater than Vbe, the first switching element Q1 is turned off, and the second switching element Q2 is turned on, at this time, the current signal in the circuit flows from the speaker 140 to the signal detection module 133 through the second switching element Q2. In both cases, the third NPN transistor is turned on, the detection signal output from the detection signal output terminal VDET to the audio detection terminal of the controller 120 is at a low level, the controller 120 detects the low-level detection signal, and determines that the audio signal output from the power amplifier 110 to the speaker 140 contains a dc component, the controller 120 controls the power amplifier 110 to stop outputting the audio signal to the speaker 140, so as to prevent the speaker 140 from being damaged, and if the audio signal still contains the dc component, the controller 120 cuts off the power supply of the power amplifier 110, so as to prevent the power amplifier 110 and the speaker 140 from being damaged.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (10)
1. An audio playback device comprising a speaker, a power amplifier connected to the speaker for outputting an audio signal to the speaker, a controller connected to the power amplifier, and an audio detection circuit for detecting the audio signal, the audio detection circuit comprising:
the audio frequency filtering module is used for filtering alternating current components in an audio frequency signal, the switch module is used for selecting on or off according to the voltage difference between two output ends of the audio frequency filtering module, and the signal detection module is used for outputting a detection signal according to the on-off state of the switch module; the controller controls the working state of the power amplifier according to the detection signal; wherein,
two input ends of the audio filtering module are respectively connected with a positive voltage end and a negative voltage end of the loudspeaker, and two output ends of the audio filtering module are respectively connected with two input ends of the switch module; the input end of the signal detection module is connected with the output end of the switch module, and the detection signal output end of the signal detection module is connected with the audio detection end of the controller.
2. The audio playback device of claim 1, wherein the number of the speakers is one, and the audio filtering module includes a first capacitor, a voltage dividing resistor, and two sampling resistors;
the positive voltage end of the loudspeaker is connected with the negative voltage end through the sampling resistor, the divider resistor and the other sampling resistor in sequence;
the first capacitor is connected with the divider resistor in parallel, and two ends of the first capacitor are respectively connected with two input ends of the switch module.
3. The audio playback device of claim 2, wherein the switch module includes a first switch element and a second switch element;
the control end of the first switch element is connected with the first end of the first capacitor, the first end of the first switch element is connected with the second end of the first capacitor, and the second end of the first switch element is connected with the input end of the signal detection module;
the control end of the second switch element is connected with the second end of the first capacitor, the first end of the second switch element is connected with the first end of the first capacitor, and the second end of the second switch element is connected with the input end of the signal detection module.
4. The audio playback device as claimed in claim 3, wherein the first switching element is a first NPN transistor, and the second switching element is a second NPN transistor;
a base electrode of the first NPN triode is a control end of the first switching element, an emitter electrode of the first NPN triode is a first end of the first switching element, and a collector electrode of the first NPN triode is a second end of the first switching element;
the base electrode of the second NPN triode is the control end of the second switching element, the emitter electrode of the second NPN triode is the first end of the second switching element, and the collector electrode of the second NPN triode is the second end of the second switching element.
5. The audio playback device of claim 4, wherein the signal detection module comprises a first power input terminal, a second power input terminal, a third switching element, a fourth switching element, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a detection signal output terminal;
one end of the first resistor is connected with the second end of the first switch element, the other end of the first resistor is connected with the control end of the fourth switch element, and the first resistor is connected with the first end of the fourth switch element through the second capacitor;
a control end of the fourth switching element is connected with the second power input end through the fourth resistor, a first end of the fourth switching element is connected with the second power input end, and a second end of the fourth switching element is grounded through the fifth resistor and the second resistor in sequence;
a control end of the third switching element is connected with a common end of the fifth resistor and the second resistor, a second end of the third switching element is connected with the detection signal output end and is connected with the first power input end through the third resistor, and a first end of the third switching element is grounded; the detection signal output end is connected with the audio detection end of the controller.
6. The audio playback device according to claim 5, wherein the third switching element is a third NPN transistor, and the fourth switching element is a PNP transistor;
a base electrode of the third NPN triode is a control end of the third switching element, an emitter electrode of the third NPN triode is a first end of the third switching element, and a collector electrode of the third NPN triode is a second end of the third switching element;
the base electrode of the PNP triode is the control end of the fourth switching element, the emitter electrode of the PNP triode is the first end of the fourth switching element, and the collector electrode of the PNP triode is the second end of the fourth switching element.
7. The audio playback device of claim 3, wherein the first switching element is a first PNP transistor and the second switching element is a second PNP transistor;
the base electrode of the first PNP triode is the control end of the first switching element, the emitter electrode of the first PNP triode is the first end of the first switching element, and the collector electrode of the first PNP triode is the second end of the first switching element;
the base electrode of the second PNP triode is the control end of the second switch element, the emitter electrode of the second PNP triode is the first end of the second switch element, and the collector electrode of the second PNP triode is the second end of the second switch element.
8. The audio playback device of claim 7, wherein the signal detection module comprises a first power input terminal, a third switching element, a second capacitor, a first resistor, a second resistor, a third resistor, and a detection signal output terminal;
one end of the first resistor is connected to the second end of the first switching element; the other end of the first resistor is connected with the control end of the first switching element, is grounded through the first capacitor and is grounded through the first resistor;
a second end of the third switching element is connected with the detection signal output end and the first power input end through the third resistor, and a first end of the switching element is grounded; the detection signal output end is connected with the audio detection end of the controller.
9. The audio playback device according to claim 8, wherein the third switching element is an NPN transistor;
the base of the NPN triode is the control end of the third switching element, the emitter of the NPN triode is the first end of the third switching element, and the collector of the NPN triode is the second end of the third switching element.
10. The audio playing device as claimed in claim 1, wherein the number of the speakers is plural, the audio filtering module includes a first capacitor, a voltage dividing resistor and a plurality of sampling resistors, and the positive voltage terminal of each speaker is connected to the negative voltage terminal thereof through a sampling resistor, the voltage dividing resistor and another sampling resistor in sequence; the first capacitor is connected with the divider resistor in parallel, and two ends of the first capacitor are respectively connected with two input ends of the switch module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320747217.XU CN203596901U (en) | 2013-11-22 | 2013-11-22 | Audio player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320747217.XU CN203596901U (en) | 2013-11-22 | 2013-11-22 | Audio player |
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| CN203596901U true CN203596901U (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113803A (en) * | 2014-07-17 | 2014-10-22 | 瑞声声学科技(深圳)有限公司 | Multi-voice-coil based loudspeaker system |
| CN110677775A (en) * | 2019-09-24 | 2020-01-10 | Tcl通力电子（惠州）有限公司 | Voltage dynamic control circuit and audio playing device |
| CN116156405A (en) * | 2022-12-07 | 2023-05-23 | 无锡宇宁智能科技有限公司 | Audio plug detection circuit and audio playing equipment |
-
2013
- 2013-11-22 CN CN201320747217.XU patent/CN203596901U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113803A (en) * | 2014-07-17 | 2014-10-22 | 瑞声声学科技(深圳)有限公司 | Multi-voice-coil based loudspeaker system |
| CN110677775A (en) * | 2019-09-24 | 2020-01-10 | Tcl通力电子（惠州）有限公司 | Voltage dynamic control circuit and audio playing device |
| CN116156405A (en) * | 2022-12-07 | 2023-05-23 | 无锡宇宁智能科技有限公司 | Audio plug detection circuit and audio playing equipment |
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