CN216719482U - Audio signal detection circuit - Google Patents
Audio signal detection circuit Download PDFInfo
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- CN216719482U CN216719482U CN202220077600.8U CN202220077600U CN216719482U CN 216719482 U CN216719482 U CN 216719482U CN 202220077600 U CN202220077600 U CN 202220077600U CN 216719482 U CN216719482 U CN 216719482U
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Abstract
The utility model discloses an audio signal detection circuit which comprises a capacitor C31, wherein one end of a capacitor C31 is a signal input end, the other end of the capacitor C31 is divided into two paths after passing through a resistor R47, the first path is connected with a base electrode of a triode Q3, the second path is connected with a +5V power supply through a resistor R8, an emitting electrode of the Q3 is grounded, a collector electrode of the Q3 is divided into two paths, the first path is connected with the +5V power supply through a resistor R49, the second path is divided into two paths after passing through a resistor R50, the first path is grounded through a capacitor C37, the second path is connected with a base electrode of a triode Q4 through a resistor R51, an emitting electrode of the Q4 is grounded, a collector electrode of the Q4 is divided into two paths, the first path is a signal output end, and the second path is connected with the +5V power supply through a resistor R4. The detection circuit has the advantages of small circuit size, low cost, convenience in use and the like.
Description
Technical Field
The utility model relates to the technical field of audio signal processing circuits, in particular to an audio signal detection circuit.
Background
In audio signal processing systems, it is often necessary to detect whether a signal is being transmitted on the audio bus. The traditional ADC detection circuit requires a control chip to integrate ADC functions or to be externally hung with an ADC chip, and in addition, the control chip needs to use a specific filtering algorithm to ensure the detection reliability, so that the size is large and the cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of how to provide an audio signal detection circuit which is small in size, low in cost and convenient to use.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: an audio signal detection circuit, characterized by: the high-voltage power supply circuit comprises a capacitor C31, one end of a capacitor C31 is a signal input end, the other end of the capacitor C31 is divided into two paths through a resistor R47, the first path is connected with a base electrode of a triode Q3, the second path is connected with a +5V power supply through a resistor R8, an emitter electrode of the Q3 is grounded, a collector electrode of the Q3 is divided into two paths, the first path is connected with the +5V power supply through a resistor R49, the second path is divided into two paths through a resistor R50, the first path is grounded through a capacitor C37, the second path is connected with a base electrode of a triode Q4 through a resistor R51, an emitter electrode of the Q4 is grounded, a collector electrode of the Q4 is divided into two paths, the first path is a signal output end, and the second path is connected with the +5V power supply through a resistor R4.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: this application detection circuitry realizes audio signal through using electric capacity, resistance and triode etc. and detects the function, has advantages such as circuit is small, with low costs, convenient to use, only need judge the level state of IO during the application, just can accomplish the detection function.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a detection circuit according to an embodiment of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, an embodiment of the present invention discloses an audio signal detection circuit, which includes a capacitor C31, wherein one end of the capacitor C31 is a signal input end, the other end of the capacitor C31 is divided into two paths after passing through a resistor R47, the first path is connected to a base of a transistor Q3, the second path is connected to a +5V power supply through a resistor R8, an emitter of the transistor Q3 is grounded, a collector of the transistor Q3 is divided into two paths, the first path is connected to the +5V power supply through a resistor R49, the second path is divided into two paths after passing through a resistor R50, the first path is grounded through a capacitor C37, the second path is connected to a base of a transistor Q4 through a resistor R51, an emitter of the transistor Q4 is grounded, a collector of the transistor Q4 is divided into two paths, the first path is a signal output end, and the second path is connected to the +5V power supply through a resistor R4.
Capacitance C31: the alternating current and direct current are conducted, and only analog alternating current signals can be allowed to enter;
capacitance C37: by utilizing the characteristic that the voltage at two ends of the capacitor cannot be suddenly changed, the negative half-cycle signal amplified by the Q3 is more stable, and the false touch probability is reduced;
resistance R48, resistance R49: providing a proper static operating point for the transistor Q3 to enable the transistor to work in a saturation state;
a triode Q3 for amplifying the negative half cycle of the input signal;
a triode Q4 for inverting the signal filtered by the C37;
resistance R4: matching MCU signal level;
resistance R50, resistance R51: the current limiting function is realized.
The working principle is as follows:
an audio analog signal is input from an AUX _ IN (capacitor C31) end, enters a base of Q3 through R47 current limiting, a Q3 amplifies a negative half cycle of a signal, the amplified signal becomes a pulsating signal with only a positive half cycle, current limiting filtering is carried out through R50 and C37 to obtain a smooth level signal, the smooth level signal enters a Q4 base through R51, a Q4 overturning level signal is output from a collector, and an output signal enters an MCU (microprogrammed control unit) and the like for processing.
When a signal is input, AUX _ AD is 0, where the detection signal is low;
when no signal is input, AUX _ AD is 1, where the detection signal is high.
This application detection circuitry realizes audio signal through using electric capacity, resistance and triode etc. and detects the function, has advantages such as circuit is small, with low costs, convenient to use, only need judge the level state of IO during the application, just can accomplish the detection function.
Claims (1)
1. An audio signal detection circuit, characterized by: the high-voltage power supply circuit comprises a capacitor C31, one end of a capacitor C31 is a signal input end, the other end of the capacitor C31 is divided into two paths through a resistor R47, the first path is connected with a base electrode of a triode Q3, the second path is connected with a +5V power supply through a resistor R8, an emitter electrode of the Q3 is grounded, a collector electrode of the Q3 is divided into two paths, the first path is connected with the +5V power supply through a resistor R49, the second path is divided into two paths through a resistor R50, the first path is grounded through a capacitor C37, the second path is connected with a base electrode of a triode Q4 through a resistor R51, an emitter electrode of the Q4 is grounded, a collector electrode of the Q4 is divided into two paths, the first path is a signal output end, and the second path is connected with the +5V power supply through a resistor R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220077600.8U CN216719482U (en) | 2022-01-13 | 2022-01-13 | Audio signal detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220077600.8U CN216719482U (en) | 2022-01-13 | 2022-01-13 | Audio signal detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216719482U true CN216719482U (en) | 2022-06-10 |
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ID=81891424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220077600.8U Active CN216719482U (en) | 2022-01-13 | 2022-01-13 | Audio signal detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216719482U (en) |
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2022
- 2022-01-13 CN CN202220077600.8U patent/CN216719482U/en active Active
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