Audio conversion testing device for vehicle-mounted entertainment information system

Abstract

The utility model relates to an audio conversion testing device for a vehicle-mounted entertainment information system, which comprises a circuit board, a straight pin seat, an audio single-ended signal interface and an audio power amplification chip are mounted on the circuit board, and the straight pin seat is electrically connected with a UVP pin, a VDD pin, a GND pin and a VSS pin of the audio power amplification chip through a power supply circuit. The straight needle seat is connected with a + INR pin and a-INR pin of the audio power amplification chip through the right audio differential input circuit, the straight needle seat is connected with a + INL pin and a-INL pin of the audio power amplification chip through the left audio differential input circuit, and the audio single-ended signal interface is connected with an OUTR pin and an OUTL pin of the audio power amplification chip. The right audio differential input circuit and the left audio differential input circuit import differential audio signals into the audio power amplification chip, the differential audio signals are processed into single-end signals, the audio single-end signal interface is connected with an audio interface of a computer through an audio data line, and the processed single-end signals are reported to the computer to be tested.

Description

TECHNICAL FIELD

[0001] The utility model relates to audio frequency test technical field especially, relate to a kind of vehicle-mounted entertainment information system audio frequency conversion test device. BACKGROUND

[0002] In the field of vehicle-mounted entertainment information system testing, with the increasing popularity of entertainment information system, users' requirements for audio experience are also increasing. The existing vehicle-mounted system supports multiple audio formats, such as MP3, WAV, AAC, etc., but due to differences in hardware or software, there are differences in audio quality, sound effects and compatibility between different formats. Existing audio testing methods often rely on manual use of complex signal analysis tools, which cannot continuously meet the high requirements for sound quality and compatibility in the vehicle-mounted entertainment system testing process, so there is an urgent need for an audio conversion test device to convert the differential audio signal of the vehicle-mounted entertainment information system into a single-ended signal and report the data to the computer for processing through the computer's microphone port. UTILITY MODEL CONTENT

[0003] The utility model aims at overcoming the above problems existing in the prior art and providing a vehicle-mounted entertainment information system audio frequency conversion test device.

[0004] To achieve the above technical purposes and effects, the utility model realizes the following technical solutions:

[0005] A vehicle-mounted entertainment information system audio frequency conversion test device includes a circuit board, a straight pin seat for plugging with the vehicle-mounted entertainment information system, an audio single-ended signal interface for transmitting to a computer, and an audio power amplification chip for audio signal processing. The straight pin seat is electrically connected to the UVP pin, VDD pin, GND pin, and VSS pin of the audio power amplification chip through a power supply circuit. The straight pin seat is connected to the +INR pin and -INR pin of the audio power amplification chip through a right audio differential input circuit. The straight pin seat is connected to the +INL pin and -INL pin of the audio power amplification chip through a left audio differential input circuit. The audio single-ended signal interface is connected to the OUTR pin and OUTL pin of the audio power amplification chip.

[0006] The straight pin seat has six straight pins arranged in a straight line with the same spacing. The six straight pins are a first straight pin, a second straight pin, a third straight pin, a fourth straight pin, a fifth straight pin, and a sixth straight pin.

[0007] The power supply circuit includes a linear low-voltage stabilizer, a thirteenth resistor, a fourteenth resistor, an eleventh capacitor, a thirteenth capacitor, and a fourteenth capacitor. The first straight pin is electrically connected to an input pin of the linear low-voltage stabilizer, one end of the fourteenth capacitor, and one end of the thirteenth resistor. The other end of the thirteenth resistor is electrically connected to one end of the fourteenth resistor and a UVP pin of the audio power amplifier chip. An output pin of the linear low-voltage stabilizer is electrically connected to one end of the thirteenth capacitor and a VDD pin of the audio power amplifier chip. One end of the eleventh capacitor is electrically connected to a VSS pin of the audio power amplifier chip. The second straight pin is electrically connected to a ground pin of the linear low-voltage stabilizer, the other end of the eleventh capacitor, the other end of the thirteenth capacitor, the other end of the fourteenth capacitor, the other end of the fourteenth resistor, and a GND pin of the audio power amplifier chip.

[0008] The right audio differential input circuit includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor. The third straight pin is electrically connected to one end of the fourth capacitor. The other end of the fourth capacitor is electrically connected to one end of the third resistor. The other end of the third resistor is electrically connected to one end of the second capacitor, one end of the fifth resistor, and one end of the sixth resistor. The other end of the fifth resistor is electrically connected to one end of the fifth capacitor and a +INR pin of the audio power amplifier chip. The fourth straight pin is electrically connected to one end of the third capacitor. The other end of the third capacitor is electrically connected to one end of the second resistor. The other end of the second resistor is electrically connected to the other end of the second capacitor, one end of the first resistor, and one end of the fourth resistor. The other end of the fourth resistor is electrically connected to one end of the first capacitor and an -INL pin of the audio power amplifier chip. The right output pin of the audio single-ended signal interface is electrically connected to the other end of the first capacitor, the other end of the first resistor, and an OUTR pin of the audio power amplifier chip. The second straight pin is electrically connected to the other end of the sixth resistor and the other end of the fifth capacitor.

[0009] The left audio differential input circuit comprises a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor, one end of the sixth straight pin is electrically connected with one end of the ninth capacitor, the other end of the ninth capacitor is electrically connected with one end of the ninth resistor, the other end of the ninth resistor is electrically connected with one end of the seventh capacitor, one end of the eleventh resistor and one end of the twelfth resistor, the other end of the eleventh resistor is electrically connected with one end of the tenth capacitor and the +INL pin of the audio power amplification chip, one end of the fifth straight pin is electrically connected with one end of the eighth capacitor, the other end of the eighth capacitor is electrically connected with one end of the eighth resistor, the other end of the eighth resistor is electrically connected with the other end of the seventh capacitor, one end of the tenth resistor and one end of the seventh resistor, the other end of the tenth resistor is electrically connected with one end of the sixth capacitor and the -INL pin of the audio power amplification chip, the left output pin of the audio single-end signal interface is electrically connected with the other end of the sixth capacitor, the other end of the seventh resistor and the OUTL pin of the audio power amplification chip, and the other end of the twelfth resistor and the other end of the tenth capacitor are electrically connected with the second straight pin.

[0010] The CN pin and the CP pin of the audio power amplification chip are connected with a twelfth capacitor.

[0011] The audio single-end signal interface comprises a 3.5mm earphone interface and a USB interface.

[0012] The circuit board is rectangular, the length of the circuit board is 40mm, and the width of the circuit board is 30mm.

[0013] The audio power amplification chip U1 is TPA6138A2 chip.

[0014] The right audio differential input circuit and the left audio differential input circuit are used for guiding the differential audio signal into the audio power amplification chip, the differential audio signal is processed into a single-end signal through the audio power amplification chip, the audio single-end signal interface is connected with the audio interface of the computer through the audio data line, and the processed single-end signal is reported to the computer for testing. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings described herein are used to provide further understanding of the utility model and form part of the present application, the illustrative embodiments of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model.

[0016] Figure 1 It is the circuit diagram of the audio conversion test device in the utility model;

[0017] Figure 2 is the structural schematic view of the audio conversion test device in the utility model;

[0018] Mark explanation in drawing: audio power amplifier chip U1, linear low-voltage stabilizer U2, circuit board 3, straight needle seat 4, 3.5mm earphone interface 51, USB interface 52, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, seventh resistor R7, eighth resistor R8, ninth resistor R9, tenth resistor R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, first capacitor C1, second capacitor C2, third capacitor C3, fourth capacitor C4, fifth capacitor C5, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8, ninth capacitor C9, tenth capacitor C10, eleventh capacitor C11, twelfth capacitor C12, thirteenth capacitor C13, fourteenth capacitor C14. DETAILED DESCRIPTION

[0019] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0020] As Figure 1 and Figure 2 Indicated, a kind of vehicle-mounted entertainment information system audio conversion test device, including circuit board 3, circuit board 3 is equipped with the straight needle seat 4 for being inserted with vehicle-mounted entertainment information system cooperation, for transmitting to computer audio single-ended signal interface, for audio signal processing audio power amplifier chip U1.

[0021] Circuit board is rectangle, the length of circuit board is 40 millimeters, the width of circuit board is 30 millimeters, size is small, it is convenient to carry.

[0022] The straight needle seat 4 is provided with six straight needles of same interval and in a straight line, six straight needles are first straight needle, second straight needle, third straight needle, fourth straight needle, fifth straight needle, sixth straight needle in turn.

[0023] Audio single-ended signal interface includes 3.5mm earphone interface 51 and USB interface 52;Audio power amplifier chip U1 adopts TPA6138A2 chip.

[0024] The straight needle seat 4 is electrically connected with the UVP pin, the VDD pin, the GND pin and the VSS pin of the audio power amplifier chip U1 through the power supply circuit. Specifically, the power supply circuit comprises a linear low-voltage stabilizer U2, a thirteenth resistor R13, a fourteenth resistor R14, an eleventh capacitor C11, a thirteenth capacitor C13 and a fourteenth capacitor C14. The first straight needle is electrically connected with the input pin of the linear low-voltage stabilizer U2, one end of the fourteenth capacitor C14 and one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is electrically connected with one end of the fourteenth resistor R14 and the UVP pin of the audio power amplifier chip U2. The output pin of the linear low-voltage stabilizer U2 is electrically connected with one end of the thirteenth capacitor C13 and the VDD pin of the audio power amplifier chip U1. One end of the eleventh capacitor C11 is electrically connected with the VSS pin of the audio power amplifier chip U1. The second straight needle is electrically connected with the grounding pin of the linear low-voltage stabilizer U2, the other end of the eleventh capacitor C11, the other end of the thirteenth capacitor C13, the other end of the fourteenth capacitor C14, the other end of the fourteenth resistor R14 and the GND pin of the audio power amplifier chip U1.

[0025] The straight needle seat 4 is connected with the +INR pin and the -INR pin of the audio power amplifier chip U1 through the right audio differential input circuit. The right audio differential input circuit comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6. The third straight needle is electrically connected with one end of the fourth capacitor C4. The other end of the fourth capacitor C4 is electrically connected with one end of the third resistor R3. The other end of the third resistor R3 is electrically connected with one end of the second capacitor C2, one end of the fifth resistor R5 and one end of the sixth resistor R6. The other end of the fifth resistor R5 is electrically connected with one end of the fifth capacitor C5 and the +INR pin of the audio power amplifier chip U1. The fourth straight needle is electrically connected with one end of the third capacitor C3. The other end of the third capacitor C3 is electrically connected with one end of the second resistor R2. The other end of the second resistor R2 is electrically connected with the other end of the second capacitor C2, one end of the first resistor R1 and one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected with one end of the first capacitor C1 and the -INL pin of the audio power amplifier chip U1. The right output pin of the audio single-ended signal interface is electrically connected with the other end of the first capacitor and the other end of the first resistor R1. The second straight needle is electrically connected with the other end of the sixth resistor R6 and the other end of the fifth capacitor C5.

[0026] The straight needle seat 4 is connected with the +INL pin and the -INL pin of the audio power amplification chip U1 through the left audio differential input circuit, and the left audio differential input circuit comprises a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12, one end of the sixth straight needle is electrically connected with one end of the ninth capacitor C9, the other end of the ninth capacitor C9 is electrically connected with one end of the ninth resistor R9, the other end of the ninth resistor R9 is electrically connected with one end of the seventh capacitor C7, one end of the eleventh resistor R11 and one end of the twelfth resistor R12, the other end of the eleventh resistor E11 is electrically connected with one end of the tenth capacitor C10 and the +INL pin of the audio power amplification chip U1, one end of the fifth straight needle is electrically connected with one end of the eighth capacitor C8, the other end of the eighth capacitor C8 is electrically connected with one end of the eighth resistor R8, the other end of the eighth resistor R8 is electrically connected with the other end of the seventh capacitor C7, one end of the tenth resistor R10 and one end of the seventh resistor R7, the other end of the tenth resistor R10 is electrically connected with one end of the sixth capacitor C6 and the -INL pin of the audio power amplification chip U1, the left output pin of the audio single-end signal interface is electrically connected with the other end of the sixth capacitor C6 and the other end of the seventh resistor R7, and the second straight needle is electrically connected with the other end of the twelfth resistor R12 and the other end of the tenth capacitor C10.

[0027] The audio single-end signal interface is connected with the OUTR pin and the OUTL pin of the audio power amplification chip U1.

[0028] A twelfth capacitor C12 is connected between the CN pin and the CP pin of the audio power amplification chip U1.

[0029] The differential audio signal is introduced into the audio power amplification chip through the right audio differential input circuit and the left audio differential input circuit, the differential audio signal is processed into a single-end signal through the audio power amplification chip, the audio single-end signal interface is connected with the audio interface of the computer through the audio data line, and the processed single-end signal is reported to the computer for testing.

[0030] The basic principle, main features and advantages of the utility model are shown and described above. The skilled in the art should understand that the utility model is not limited by the above examples, and the above examples and the description in the specification only illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model.

Claims

1. An in-vehicle infotainment system audio conversion test device comprising a circuit board, characterized by: The circuit board is provided with a straight pin seat for plugging with a vehicle-mounted entertainment information system, an audio single-end signal interface for transmitting to a computer, and an audio power amplification chip for audio signal processing.

2. The audio transition test apparatus of claim 1, wherein: Six straight pins with the same spacing and arranged in a line are arranged on the straight pin seat, and the six straight pins are sequentially a first straight pin, a second straight pin, a third straight pin, a fourth straight pin, a fifth straight pin, and a sixth straight pin.

3. The audio transition test apparatus of claim 2, wherein: The power supply circuit comprises a linear low-voltage stabilizer, a thirteenth resistor, a fourteenth resistor, an eleventh capacitor, a thirteenth capacitor, and a fourteenth capacitor, the first straight pin is electrically connected with an input pin of the linear low-voltage stabilizer, one end of the fourteenth capacitor, and one end of the thirteenth resistor, the other end of the thirteenth resistor is electrically connected with one end of the fourteenth resistor and a UVP pin of the audio power amplification chip, an output pin of the linear low-voltage stabilizer is electrically connected with one end of the thirteenth capacitor and a VDD pin of the audio power amplification chip, one end of the eleventh capacitor is electrically connected with a VSS pin of the audio power amplification chip, and the second straight pin is electrically connected with a ground pin of the linear low-voltage stabilizer, the other end of the eleventh capacitor, the other end of the thirteenth capacitor, the other end of the fourteenth capacitor, the other end of the fourteenth resistor, and a GND pin of the audio power amplification chip.

4. The audio transition test apparatus of claim 2, wherein: The right audio differential input circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor, the third straight pin is electrically connected with one end of the fourth capacitor, the other end of the fourth capacitor is electrically connected with one end of the third resistor, the other end of the third resistor is electrically connected with one end of the second capacitor, one end of the fifth resistor, and one end of the sixth resistor, the other end of the fifth resistor is electrically connected with one end of the fifth capacitor and a +INR pin of the audio power amplification chip, the fourth straight pin is electrically connected with one end of the third capacitor, the other end of the third capacitor is electrically connected with one end of the second resistor, the other end of the second resistor is electrically connected with the other end of the second capacitor, one end of the first resistor, and one end of the fourth resistor, the other end of the fourth resistor is electrically connected with one end of the first capacitor and a -INL pin of the audio power amplification chip, and the right output pin of the audio single-end signal interface is electrically connected with the other end of the first capacitor, the other end of the first resistor, and an OUTR pin of the audio power amplification chip. The second straight pin is electrically connected with the other end of the sixth resistor and the other end of the fifth capacitor.

5. The audio transition test apparatus of claim 2, wherein: The left audio differential input circuit includes a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor, one end of the sixth straight pin is electrically connected with one end of the ninth capacitor, the other end of the ninth capacitor is electrically connected with one end of the ninth resistor, the other end of the ninth resistor is electrically connected with one end of the seventh capacitor, one end of the eleventh resistor and one end of the twelfth resistor, the other end of the eleventh resistor is electrically connected with one end of the tenth capacitor and the +INL pin of the audio power amplifier chip, one end of the fifth straight pin is electrically connected with one end of the eighth capacitor, the other end of the eighth capacitor is electrically connected with one end of the eighth resistor, the other end of the eighth resistor is electrically connected with the other end of the seventh capacitor, one end of the tenth resistor and one end of the seventh resistor, the other end of the tenth resistor is electrically connected with one end of the sixth capacitor and the -INL pin of the audio power amplifier chip, the left output pin of the audio single-end signal interface is electrically connected with the other end of the sixth capacitor, the other end of the seventh resistor and the OUTL pin of the audio power amplifier chip, the other end of the twelfth resistor and the other end of the tenth capacitor are electrically connected with the two straight pins.

6. The audio conversion test apparatus of claim 1, wherein: The CN pin and the CP pin of the audio power amplifier chip are connected with a twelfth capacitor.

7. The audio conversion test apparatus of claim 1, wherein: The audio single-end signal interface includes a 3.5mm earphone interface and a USB interface.

8. The audio conversion test apparatus of claim 1, wherein: The circuit board is rectangular, the length of the circuit board is 40mm, and the width of the circuit board is 30mm.

9. The audio conversion test apparatus of claim 1, wherein: The audio power amplifier chip U1 adopts a TPA6138A2 chip.

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