CN216752078U - Pickup circuit suitable for aircraft is miniaturized - Google Patents
Pickup circuit suitable for aircraft is miniaturized Download PDFInfo
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- CN216752078U CN216752078U CN202220388895.0U CN202220388895U CN216752078U CN 216752078 U CN216752078 U CN 216752078U CN 202220388895 U CN202220388895 U CN 202220388895U CN 216752078 U CN216752078 U CN 216752078U
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Abstract
The utility model discloses a pickup circuit suitable for airplane miniaturization, which relates to the technical field of pickup and comprises an audio signal input end, an audio acquisition circuit, an amplifier, an audio noise reduction circuit and an audio signal output end; the audio acquisition circuit comprises a power supply conditioning circuit, an audio transformer, a level signal AD conversion circuit, an audio signal DA conversion circuit, an audio coding and decoding circuit, a comparator group and an audio recorder; the audio noise reduction circuit comprises a main chip and an audio power amplifier chip; the pickup circuit processes the acquired audio signals through the audio acquisition circuit, the amplifier and the audio noise reduction circuit to obtain high-quality audio signals, reduces EMI electromagnetic interference, has stable and reliable signal quality, and is suitable for severe environments with high temperature, high humidity, high salt fog and violent vibration of airplanes.
Description
Technical Field
The utility model relates to the technical field of pickup, in particular to a pickup circuit suitable for miniaturization of an airplane.
Background
The application of the sound pick-up is very extensive, and its main theory of operation is to turn into the acoustic signal the signal of telecommunication, does further preamplification through the amplifier, and the noise is removed, then turns into the acoustic signal again with the signal of telecommunication, broadcasts through loudspeaker.
The PCB size of current adapter on the market is bigger than normal, and the overall arrangement is unreasonable, can not adapt to high temperature, high humidity, high salt fog, violent vibration adverse circumstances on the aircraft.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of the prior art, the utility model provides a pickup circuit suitable for airplane miniaturization, which comprises an audio signal input end, an audio acquisition circuit, an amplifier, an audio noise reduction circuit and an audio signal output end;
the audio signal input end is electrically connected with the signal input end of the audio acquisition circuit, the signal output end of the audio acquisition circuit is electrically connected with the input end of the amplifier, the output end of the amplifier is electrically connected with the input end of the audio noise reduction circuit, and the output end of the audio noise reduction circuit is electrically connected with the audio signal output end;
the audio acquisition circuit comprises a power supply conditioning circuit, an audio transformer, a level signal AD conversion circuit, an audio signal DA conversion circuit, an audio coding and decoding circuit, a comparator group and an audio recorder;
the comparator group comprises 10 mutually independent comparators, each comparator is provided with a threshold, and when the audio analog signal exceeds the threshold of the comparator, the comparator can output a prompt signal;
the power supply conditioning circuit supplies power to the level AD conversion circuit, the audio DA conversion circuit and the audio coding and decoding circuit;
the audio transformer, the level AD conversion circuit, the audio coding and decoding circuit and the audio recorder form an audio acquisition circuit, the audio transformer outputs a level analog signal to the level AD conversion circuit after being used as the audio acquisition audio, the level AD conversion circuit outputs a converted level digital signal to the audio coding and decoding circuit, and the audio coding and decoding circuit outputs a digital audio signal to the audio recorder;
the audio recorder outputs the recorded audio signal to the audio DA conversion circuit, and the audio DA conversion circuit outputs the converted audio analog signal to the comparator group;
the audio noise reduction circuit comprises a main chip and an audio power amplifier chip, wherein the left sound channel output end of the main chip is connected with the positive input end of the left audio frequency of the audio power amplifier chip, the right sound channel output end of the main chip is connected with the positive input end of the right audio frequency of the audio power amplifier chip, the negative input end of the left audio frequency of the audio power amplifier chip is connected to the ground end through a first virtual resistor, the negative input end of the right audio frequency of the audio power amplifier chip is connected to the ground end through a second virtual resistor, and the first virtual resistor and the second virtual resistor are formed by two pad short-circuit connections.
Further, the thresholds of the 10 mutually independent comparators in the comparator group are different.
Further, the comparator outputs the prompt signal in the form of an output level signal or a trigger signal.
In a further proposal, the audio acquisition circuit also comprises a light emitting diode group,
and each comparator corresponds to one light-emitting diode, and when the comparator outputs a prompt signal, the corresponding light-emitting diode is lightened.
According to a further scheme, the negative input end of the left audio frequency is connected with the first virtual resistor through a first capacitor, the positive input end of the left audio frequency is connected with the output end of the left audio frequency sequentially through a third capacitor and a third resistor, and a common node of the third capacitor and the third resistor is connected with a common node of the first capacitor and the first virtual resistor through a fourth capacitor.
According to a further scheme, the right audio negative input end is connected with the second virtual resistor through a second capacitor, the right audio positive input end is connected with the right audio output end sequentially through a fifth capacitor and a fourth resistor, and a common node of the second capacitor and the second virtual resistor is connected with a common node of the fifth capacitor and the fourth resistor through a sixth capacitor.
The utility model has the beneficial effects that:
the pickup circuit processes the acquired audio signals through the audio acquisition circuit, the amplifier and the audio noise reduction circuit to obtain high-quality audio signals, reduces EMI electromagnetic interference, has stable and reliable signal quality, and is suitable for severe environments with high temperature, high humidity, high salt fog and violent vibration of airplanes;
the audio acquisition circuit adopted by the utility model adopts a balanced output mode, so that the audio acquisition definition is higher, the audio acquisition amplification factor and the compression ratio can be adjusted, the relevant parameters of audio acquisition can be adjusted according to the actual environment, and the volume can be displayed in an intuitive mode during audio monitoring output;
the audio noise reduction circuit is provided with the main chip and the audio power amplifier chip, the left sound channel output end of the main chip is connected with the left audio positive input end of the audio power amplifier chip, the right sound channel output end of the main chip is connected with the right audio positive input end of the audio power amplifier chip, the negative input end of the audio power amplifier chip is grounded through the virtual resistor for noise reduction, the virtual resistor is composed of the bonding pad, other electronic components are not required to be added, and the cost of the noise reduction circuit is reduced.
Drawings
Fig. 1 is a structural diagram of a pickup circuit suitable for miniaturization of an airplane according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of an audio acquisition circuit in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an audio noise reduction circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of an audio noise reduction circuit according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1, an embodiment of the present invention discloses a pickup circuit suitable for airplane miniaturization, which includes an audio signal input terminal, an audio acquisition circuit, an amplifier, an audio noise reduction circuit, and an audio signal output terminal;
the audio signal input end is electrically connected with the signal input end of the audio acquisition circuit, the signal output end of the audio acquisition circuit is electrically connected with the input end of the amplifier, the output end of the amplifier is electrically connected with the input end of the audio noise reduction circuit, and the output end of the audio noise reduction circuit is electrically connected with the audio signal output end;
in the embodiment, the collected audio signals are processed by the audio collecting circuit, the amplifier and the audio noise reduction circuit to obtain high-quality audio signals, so that the EMI electromagnetic interference is reduced, the signal quality is stable and reliable, and the method is suitable for severe environments with high temperature, high humidity, high salt fog and violent vibration of airplanes;
as shown in fig. 2, the audio acquisition circuit includes a power conditioning circuit, an audio transformer, a level signal AD conversion circuit, an audio signal DA conversion circuit, an audio encoding/decoding circuit, a comparator set, and an audio recorder;
the comparator group comprises 10 mutually independent comparators, each comparator is provided with a threshold, and when the audio analog signal exceeds the threshold of the comparator, the comparator can output a prompt signal;
the power supply conditioning circuit supplies power to the level AD conversion circuit, the audio DA conversion circuit and the audio coding and decoding circuit;
the audio transformer, the level AD conversion circuit, the audio coding and decoding circuit and the audio recorder form an audio acquisition circuit, the audio transformer outputs a level analog signal to the level AD conversion circuit after being used as the audio acquisition audio, the level AD conversion circuit outputs a converted level digital signal to the audio coding and decoding circuit, and the audio coding and decoding circuit outputs a digital audio signal to the audio recorder;
the audio recorder outputs the recorded audio signal to the audio DA conversion circuit, and the audio DA conversion circuit outputs the converted audio analog signal to the comparator group;
the audio noise reduction circuit comprises a main chip and an audio power amplifier chip, wherein the left sound channel output end of the main chip is connected with the left audio positive input end of the audio power amplifier chip, the right sound channel output end of the main chip is connected with the right audio positive input end of the audio power amplifier chip, the left audio negative input end of the audio power amplifier chip is connected to the ground end through a first virtual resistor, the right audio negative input end of the audio power amplifier chip is connected to the ground end through a second virtual resistor, and the first virtual resistor and the second virtual resistor are formed by two bonding pad short-circuit connections.
The thresholds of the 10 mutually independent comparators in the comparator group in the present embodiment are different.
The output prompt signal of the comparator in this embodiment is in the form of an output level signal or a trigger signal.
The audio acquisition circuit in this embodiment further includes a light emitting diode group, and each comparator corresponds to one light emitting diode, and when the comparator outputs a prompt signal, the corresponding light emitting diode is lit.
The flat signal AD conversion circuit and the audio signal DA conversion circuit in this embodiment are implemented by one chip, which is a digital/analog conversion chip.
As shown in fig. 3-4, the audio noise reduction circuit in this embodiment includes a main chip and an audio power amplifier chip, a left channel output end of the main chip is connected to a left audio positive input end of the audio power amplifier chip, a right channel output end of the main chip is connected to a right audio positive input end of the audio power amplifier chip, a left audio negative input end of the audio power amplifier chip is connected to a ground end through a first virtual resistor, a right audio negative input end of the audio power amplifier chip is connected to the ground end through a second virtual resistor, and the first virtual resistor and the second virtual resistor are both formed by two pads that are connected in a short circuit.
The main chip may be various processors having an audio decoding function, and the main chip may decode a digital audio signal into an analog audio signal.
The audio power amplifier chip may be a processor that performs power amplification on the analog audio signal to drive the speaker to vibrate, wherein the audio power amplifier chip may be provided with a left audio positive input terminal LINP, a left audio negative input terminal LINN, a right audio positive input terminal RINP, and a right audio negative input terminal RINN, and the model of the audio power amplifier chip of this embodiment may be TPA3110LD2 PWPR.
In this embodiment, the left channel output terminal LOUT of the main chip is connected with the left audio positive input terminal LINP of the audio power amplifier chip, the right channel output terminal ROUT of the main chip is connected with the right audio positive input terminal LINP of the audio power amplifier chip, the left audio negative input terminal LINN of the audio power amplifier chip is connected to the ground through the first virtual resistor R1, the right audio negative input terminal RINN of the audio power amplifier chip is connected to the ground through the second virtual resistor R2, wherein the first virtual resistor R1 and the second virtual resistor R2 are both formed by short-circuit connection of two bonding pads. The land is a basic unit of a surface mount assembly of a circuit board, and is used to form a land pattern (land pattern) of the circuit board to fix various electronic components on the circuit board.
The audio noise reduction circuit is integrated in the circuit board, and the width of the bonding pads forming the first virtual resistor R1 and the second virtual resistor R2 is equal to the width of the copper traces of the circuit board.
The left audio negative input end LINN is connected with the first virtual resistor R1 through the first capacitor C1, the left audio positive input end LINP is connected with the left audio output end LOUT through the third capacitor C3 and the third resistor R3 in sequence, and a common node of the third capacitor C3 and the third resistor R3 is connected with a common node of the first capacitor C1 and the first virtual resistor R1 through the fourth capacitor C4.
The right audio negative input end RINN is connected with the second virtual resistor R2 through the second capacitor C2, the right audio positive input end RINP is connected with the right audio output end ROUT through the fifth capacitor C5 and the fourth resistor R4 in sequence, a common node of the second capacitor C2 and the second virtual resistor R3 is connected with a common node of the fifth capacitor C5 and the fourth resistor R4 through the sixth capacitor C6, and in the embodiment, by adding capacitors in the audio input end and the ground loop, noise can be effectively reduced.
The audio noise reduction circuit of the embodiment is integrated in the circuit board, that is, the main chip and the audio power amplifier chip are electrically connected through the circuit board.
In the circuit board, the left sound channel output terminal LOUT of the main chip, the right sound channel output terminal ROUT and the left audio positive input terminal LINP of the audio power amplifier chip, the right audio positive input terminal RINP is connected through the first line copper L of walking, the ground of the main chip and the left audio negative input terminal LINN of the audio power amplifier chip, the right audio negative input terminal RINN is connected through the second line copper N of walking, and the first line copper L of walking and the second line copper N of walking are arranged in parallel in the circuit board as the differential wiring design, can constitute the loop by arranging the parallel paired line copper in the circuit board, make the impedance of the first line copper L of walking and the second line copper N of walking minimum, thereby make the noise that the inside of the audio power amplifier chip itself produce carry out mutual cancellation on the loop after the parallel wiring design of differential signal, further reduced the noise of the audio power amplifier chip.
In this embodiment, the ground end is the ground end that the main chip set up, virtual resistance R is close to the ground end setting of main chip for the second walks behind the virtual resistance R at main chip ground connection, avoided at audio power amplifier chip end, near audio power amplifier chip or negative input end (LINN and RINN) ground connection midway, lead to other ground signal interference to audio power amplifier chip, thereby solved other ground signal to audio power amplifier chip's interference, further reduced audio power amplifier chip's noise.
The negative input end of the audio power amplifier chip in the audio noise reduction circuit in the embodiment is grounded through the virtual resistor to reduce noise, the virtual resistor is composed of bonding pads, other electronic components do not need to be added, and the cost is reduced.
The ground end is the ground end that main chip set up, and virtual resistance is close to the ground end setting of main chip for the second walks behind the line copper signal through virtual resistance at main chip ground connection, avoids in audio power amplifier chip end, near audio power amplifier chip or negative input end ground connection midway, leads to other ground signal to disturb audio power amplifier chip, thereby solves other signals to audio power amplifier chip's interference, has further reduced audio power amplifier chip's noise.
Finally, only specific embodiments of the present invention have been described in detail above. The utility model is not limited to the specific embodiments described above. Equivalent modifications and substitutions by those skilled in the art are also within the scope of the present invention. Accordingly, equivalent alterations and modifications are intended to be included within the scope of the utility model, without departing from the spirit and scope of the utility model.
Claims (6)
1. The utility model provides a pickup circuit suitable for aircraft is miniaturized which characterized in that:
the device comprises an audio signal input end, an audio acquisition circuit, an amplifier, an audio noise reduction circuit and an audio signal output end;
the audio signal input end is electrically connected with the signal input end of the audio acquisition circuit, the signal output end of the audio acquisition circuit is electrically connected with the input end of the amplifier, the output end of the amplifier is electrically connected with the input end of the audio noise reduction circuit, and the output end of the audio noise reduction circuit is electrically connected with the audio signal output end;
the audio acquisition circuit comprises a power supply conditioning circuit, an audio transformer, a level signal AD conversion circuit, an audio signal DA conversion circuit, an audio encoding and decoding circuit, a comparator group and an audio recorder;
the comparator group comprises 10 mutually independent comparators, each comparator is provided with a threshold, and when the audio analog signal exceeds the threshold of the comparator, the comparator can output a prompt signal;
the power conditioning circuit supplies power to the level AD conversion circuit, the audio DA conversion circuit and the audio coding and decoding circuit;
the audio transformer, the level AD conversion circuit, the audio coding and decoding circuit and the audio recorder form an audio acquisition circuit, the audio transformer outputs a level analog signal to the level AD conversion circuit after being used as the audio acquisition audio, the level AD conversion circuit outputs a converted level digital signal to the audio coding and decoding circuit, and the audio coding and decoding circuit outputs a digital audio signal to the audio recorder;
the audio recorder outputs the recorded audio signal to the audio DA conversion circuit, and the audio DA conversion circuit outputs the converted audio analog signal to the comparator group;
the audio noise reduction circuit comprises a main chip and an audio power amplifier chip, wherein the left sound channel output end of the main chip is connected with the positive input end of the left audio frequency of the audio power amplifier chip, the right sound channel output end of the main chip is connected with the positive input end of the right audio frequency of the audio power amplifier chip, the negative input end of the left audio frequency of the audio power amplifier chip is connected to the ground end through a first virtual resistor, the negative input end of the right audio frequency of the audio power amplifier chip is connected to the ground end through a second virtual resistor, and the first virtual resistor and the second virtual resistor are formed by two pad short-circuit connections.
2. The pickup circuit according to claim 1, wherein:
the thresholds of the 10 mutually independent comparators in the comparator group are different.
3. The pickup circuit according to claim 1, wherein:
the comparator outputs the prompt signal in the form of an output level signal or a trigger signal.
4. The pickup circuit according to claim 1, wherein:
the audio acquisition circuit further comprises a light emitting diode group,
and each comparator corresponds to one light-emitting diode, and when the comparator outputs a prompt signal, the corresponding light-emitting diode is lightened.
5. The pickup circuit according to claim 1, wherein:
the left audio negative input end is connected with the first virtual resistor through a first capacitor, the left audio positive input end is connected with the left audio output end sequentially through a third capacitor and a third resistor, and a common node of the third capacitor and the third resistor is connected with a common node of the first capacitor and the first virtual resistor through a fourth capacitor.
6. The pickup circuit according to claim 1, wherein:
the right audio negative input end is connected with the second virtual resistor through a second capacitor, the right audio positive input end is connected with the right audio output end sequentially through a fifth capacitor and a fourth resistor, and a common node of the second capacitor and the second virtual resistor is connected with a common node of the fifth capacitor and the fourth resistor through a sixth capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220388895.0U CN216752078U (en) | 2022-02-25 | 2022-02-25 | Pickup circuit suitable for aircraft is miniaturized |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220388895.0U CN216752078U (en) | 2022-02-25 | 2022-02-25 | Pickup circuit suitable for aircraft is miniaturized |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216752078U true CN216752078U (en) | 2022-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220388895.0U Active CN216752078U (en) | 2022-02-25 | 2022-02-25 | Pickup circuit suitable for aircraft is miniaturized |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216752078U (en) |
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2022
- 2022-02-25 CN CN202220388895.0U patent/CN216752078U/en active Active
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