CN211089976U - Audio parameter detection device and audio analyzer - Google Patents
Audio parameter detection device and audio analyzer Download PDFInfo
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- CN211089976U CN211089976U CN201920230228.8U CN201920230228U CN211089976U CN 211089976 U CN211089976 U CN 211089976U CN 201920230228 U CN201920230228 U CN 201920230228U CN 211089976 U CN211089976 U CN 211089976U
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Abstract
The utility model discloses an audio parameter detection device and audio analyzer, include: the power amplifier input unit is connected with the equipment to be tested and the first load unit, the control module is connected with the relay switching unit, the first load unit is connected with the relay switching unit and the control module, the earphone signal input module is connected with the equipment to be tested and the control module, the line input module is connected with the equipment to be tested and the control module, and the control module is used for obtaining audio parameters of the equipment to be tested according to received load power amplifier signals, earphone input signals and line input signals. According to the technical scheme, the audio parameters of the equipment to be tested are obtained through the control module according to the received load power amplifier signals, the earphone input signals and the line input signals, automatic measurement of the audio parameters of the electronic equipment is achieved, and the measurement accuracy is improved.
Description
Technical Field
The embodiment of the utility model provides an equipment detects technical field, especially relates to an audio parameter detection device and audio analyzer.
Background
More and more electronic devices in daily life can make sounds and play music, such as televisions, computers, mobile phones, radios and other electronic devices, and the electronic devices need to test audio frequency in the production process to measure main electroacoustic technical indexes of the electronic devices, such as parameters of actual output voltage, actual output power, channel imbalance, frequency response, channel crosstalk, harmonic distortion, signal-to-noise ratio and the like.
Most of the current stages adopt a cabinet type audio analyzer for detection, and the cabinet type audio analyzer has large volume, is imported from foreign countries basically and has high purchase and maintenance cost; although each test function is more, the actual use frequency is lower, and the use rate of the equipment is lower; in addition, the test platform must be matched with a computer for use in the actual test process, and is complicated to build; the operation interface is basically English, the operation is complex, and professional people are required to operate the operation interface. At present, a small number of manufacturers in China study and manufacture related detection devices for audio parameters by themselves, but the detection devices have single test items and low test automation degree and need manual plugging and unplugging and other operations; the self-made system has low test precision and accuracy and can not truly reflect the performance.
SUMMERY OF THE UTILITY MODEL
The utility model provides an audio parameter detection device and audio analyzer realizes improving the measuring accuracy to the automatic measurement of electronic equipment's audio parameter.
In a first aspect, an embodiment of the present invention provides an audio parameter detecting device, including: the earphone comprises a power amplifier input module, an earphone signal input module, a line input module and a control module; the power amplifier input module comprises a power amplifier input unit, a first load unit and a relay switching unit; wherein the content of the first and second substances,
the power amplifier input unit is connected with the equipment to be tested and the first load unit and is used for acquiring the power amplifier signal output by the equipment to be tested and outputting the power amplifier signal to the first load unit;
the control module is connected with the relay switching unit and used for switching the on-off state of the relay switching unit according to the received load parameters of the equipment to be tested;
the first load unit is connected with the relay switching unit and the control module and used for providing a load for the received power amplification signal through the switching state of the relay switching unit, obtaining a load power amplification signal and outputting the load power amplification signal to the control module;
the earphone signal input module is connected with the equipment to be tested and the control module, and is used for acquiring an earphone input signal of the equipment to be tested and outputting the earphone input signal to the control module;
the line input module is connected with the equipment to be tested and the control module, and is used for acquiring a line input signal of the equipment to be tested and outputting the line input signal to the control module;
and the control module is used for obtaining the audio parameters of the equipment to be tested according to the received load power amplifier signals, the earphone input signals and the line input signals.
Further, the power amplifier input module further includes: the first input protection unit and the first voltage division unit; the power amplifier input unit is connected with the first load unit through the first input protection unit, and the first load unit is connected with the control module through the first voltage division unit.
Furthermore, the power amplifier input unit comprises three power amplifier sockets, wherein the first power amplifier socket is a socket with a first jack distance, the second power amplifier socket is a socket with a first pin distance, the third power amplifier socket is a socket with a second jack distance, and the first distance is different from the second distance.
Further, the first input protection unit includes: a first filtering subunit and a second filtering subunit, the first filtering subunit comprising: first inductance, second inductance, first electric capacity and second electric capacity, second filtering subunit includes: a third inductor, a fourth inductor, a third capacitor and a fourth capacitor,
the first end of the power amplifier input unit is connected with one end of a first capacitor through the first inductor, the second end of the power amplifier input unit is connected with one end of a second capacitor through the second inductor, and the other end of the first capacitor is connected with the other end of the second capacitor;
the third end of the power amplifier input unit is connected with one end of a third capacitor through the third inductor, the fourth end of the power amplifier input unit is connected with one end of a fourth capacitor through the fourth inductor, and the other end of the third capacitor is connected with the other end of the fourth capacitor.
Further, the apparatus further comprises: the first conversion module is connected with the first voltage division unit, and the first conversion module is connected with the control module through the first isolation operational amplifier module.
Further, the first conversion module includes a first conversion unit and a second conversion unit, and the first conversion unit includes: first chip, fifth electric capacity and sixth electric capacity, the second converting unit includes: the second chip, the seventh capacitor and the eighth capacitor;
the first end of the first chip is connected with the first voltage division unit, the second end of the first chip is grounded through a fifth capacitor, the third end of the first chip is connected with the fourth end of the first chip through a sixth capacitor, and the fourth end of the first chip is connected with the first isolation operational amplifier module;
the first end of the second chip is connected with the first voltage division unit, the second end of the second chip is grounded through a seventh capacitor, the third end of the second chip is connected with the fourth end of the second chip through an eighth capacitor, and the fourth end of the second chip is connected with the first isolation operational amplifier module.
Further, the first isolation operational amplifier module comprises a first isolation operational amplifier and a second isolation operational amplifier,
the first end of the first isolation operational amplifier is connected with the fourth end of the first chip, and the second end of the first isolation operational amplifier is respectively connected with the third end of the first isolation operational amplifier and the control module;
and the first end of the second isolation operational amplifier is connected with the fourth end of the second chip, and the second end of the second isolation operational amplifier is respectively connected with the third end of the second isolation operational amplifier and the control module.
Further, the earphone signal input module includes: the earphone comprises an earphone signal input unit, a second input protection unit and a second resistance unit, wherein the second input protection unit is respectively connected with the earphone signal input unit and the second resistance unit.
Further, the apparatus further comprises: the second conversion module is respectively connected with the earphone signal input module and the line input module, and the second conversion module is connected with the control module through the second isolation operational amplifier module.
Further, the apparatus further comprises: the touch display module and the power supply module; the touch display module and the power supply module are respectively connected with the control module;
the touch display module is used for receiving a touch input signal of a user and displaying an audio parameter of the equipment to be tested;
the power supply module is used for supplying power to the control module.
In a second aspect, an embodiment of the present invention further provides an audio analyzer, where the audio analyzer includes an audio parameter detecting device as described in any of the above first aspects.
The utility model provides an audio parameter detection device and audio analyzer, include: the power amplifier input unit is connected with the equipment to be tested and the first load unit and is used for acquiring a power amplifier signal output by the equipment to be tested and outputting the power amplifier signal to the first load unit; the control module is connected with the relay switching unit and used for switching the on-off state of the relay switching unit according to the received load parameters of the equipment to be tested; the first load unit is connected with the relay switching unit and the control module and used for providing a load for the received power amplification signal through the switching state of the relay switching unit to obtain a load power amplification signal and outputting the load power amplification signal to the control module; the earphone signal input module is connected with the equipment to be tested and the control module, and is used for acquiring an earphone input signal of the equipment to be tested and outputting the earphone input signal to the control module; the circuit input module is connected with the equipment to be tested and the control module and used for acquiring a circuit input signal of the equipment to be tested and outputting the circuit input signal to the control module; and the control module is used for obtaining the audio parameters of the equipment to be tested according to the received load power amplifier signals, the earphone input signals and the line input signals. According to the technical scheme, the audio parameters of the equipment to be tested are obtained through the control module according to the received load power amplifier signals, the earphone input signals and the line input signals, automatic measurement of the audio parameters of the electronic equipment is achieved, and the measurement accuracy is improved.
Drawings
Fig. 1 is a block diagram of an audio parameter detection apparatus provided in an embodiment of the present invention;
fig. 2 is a block diagram of an audio parameter detection apparatus according to an embodiment of the present invention;
fig. 3a is a block diagram of a power amplifier socket according to an embodiment of the present invention;
fig. 3b is a block diagram of another power amplifier socket according to an embodiment of the present invention;
fig. 3c is a block diagram of a structure of another power amplifier socket according to an embodiment of the present invention;
fig. 4 is a circuit diagram of an input module of a power amplifier according to an embodiment of the present invention;
fig. 5 is a circuit diagram of the conversion module and the isolation operational amplifier module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is the embodiment of the utility model provides an audio parameter detection device's block diagram, this embodiment is applicable in the condition of check out test set audio parameter, and this audio parameter detection device sets up in audio parameter check out test set.
As shown in fig. 1, the audio parameter detection apparatus provided in this embodiment mainly includes: a power amplifier input module 110, an earphone signal input module 120, a line input module 130 and a control module 140; the power amplifier input module 110 includes a power amplifier input unit 111, a first load unit 112, and a relay switching unit 113.
Further, the power amplifier input unit 110 is connected to the device to be tested and the first load unit 112, and is configured to obtain a power amplifier signal output by the device to be tested 150 and output the first load 112 unit, and the control module 140 is connected to the relay switching unit 113, and is configured to switch the on-off state of the relay switching unit 113 according to the received load parameter of the device to be tested 150; the first load unit 112 is connected to the relay switching unit 113 and the control module 140, and is configured to provide a load to the received power amplifier signal according to a switching state of the relay switching unit 113, obtain a load power amplifier signal, and output the load power amplifier signal to the control module 140.
In this embodiment, the device under test may be understood as an electronic device that can make sound or play music, such as a television, a computer, a mobile phone, and a radio. It should be noted that the device to be tested in this embodiment may be a device that has been assembled and normally used, or may be a board card related to audio in a device that has not been assembled before leaving a factory. In this embodiment, only the device to be tested is illustrated, but not limited.
The load parameter can be understood as a load value of a loudspeaker of the equipment to be tested under a normal condition. In this embodiment, the load parameter is determined by the type and model of the device under test. The obtaining mode of the load parameter can be set according to the actual situation. For example: the user may directly input the load parameter through the input device of the detection device, that is, the load parameter of the device a to be tested is 5 Ω, and the user directly inputs 5 Ω through the input device. Accordingly, the control module 140 obtains the load parameter input by the user through the input device. The input device may be a touch display screen, or an external input device such as a keyboard or a mouse, and the input device is not limited in this embodiment, and a user may design the input device according to actual conditions. For another example: the user may input the model of the device to be tested through the input device of the detection device, and determine the load parameter of the device to be tested according to the model of the device to be tested. The corresponding relation between the model of the equipment to be tested and the load parameter is stored in the detection device in advance. Accordingly, the control module 140 obtains the load parameter of the device under test determined according to the model of the device under test.
Further, the relay switching unit 113 is composed of at least one relay, and determines the load provided by the first load unit 112 to the power amplifier input unit 111 through the on and off of the normally open contact and the normally closed contact of the relay. The first load unit 112 is composed of at least two resistors, is connected with the relay switching unit 113, and changes the connection relation between the resistors according to the on and off of the normally open contact and the normally closed contact of the relay, so that the first load unit 112 can provide loads with various resistance values, thereby simulating various test scenes and realizing the test of audio parameters of different devices to be tested.
Further, the earphone signal input module 120 is connected to the device under test 150 and the control module 140, and is configured to obtain an earphone input signal of the device under test and output the earphone input signal to the control module 140; the line input module 130 is connected to the device under test 150 and the control module, and is configured to obtain a line input signal of the device under test 150 and output the line input signal to the control module 140. The control module 140 is configured to obtain an audio parameter of the device under test 150 according to the received load power amplifier signal, the earphone input signal, and the line input signal.
In the present embodiment, the control module 140 mainly includes an ADC sampling circuit and a signal processing circuit, and preferably, the control module 140 is a chip of model STM32F103CBT 6. And the load power amplifier signal, the earphone input signal and the line input signal are transmitted to the signal processing circuit after passing through the ADC sampling circuit. The ADC sampling circuit is used for converting a load power amplifier signal, an earphone input signal and a line input signal into a digital signal, and the signal processing circuit converts the converted digital signal into an actual output voltage, an actual output power, channel imbalance, channel crosstalk and a signal-to-noise ratio through a written software algorithm.
In this embodiment, preferably, the audio parameters mainly include: actual output voltage, actual output power, channel imbalance, channel crosstalk, signal-to-noise ratio, etc.
The audio parameter detection device provided by the embodiment comprises: the power amplifier input unit is connected with the equipment to be tested and the first load unit and is used for acquiring a power amplifier signal output by the equipment to be tested and outputting the power amplifier signal to the first load unit; the control module is connected with the relay switching unit and used for switching the on-off state of the relay switching unit according to the received load parameters of the equipment to be tested; the first load unit is connected with the relay switching unit and the control module and used for providing a load for the received power amplification signal through the switching state of the relay switching unit to obtain a load power amplification signal and outputting the load power amplification signal to the control module; the earphone signal input module is connected with the equipment to be tested and the control module, and is used for acquiring an earphone input signal of the equipment to be tested and outputting the earphone input signal to the control module; the circuit input module is connected with the equipment to be tested and the control module and used for acquiring a circuit input signal of the equipment to be tested and outputting the circuit input signal to the control module; and the control module is used for obtaining the audio parameters of the equipment to be tested according to the received load power amplifier signals, the earphone input signals and the line input signals. According to the technical scheme, the audio parameters of the equipment to be tested are obtained through the control module according to the received load power amplifier signals, the earphone input signals and the line input signals, automatic measurement of the audio parameters of the electronic equipment is achieved, and the measurement accuracy is improved.
On the basis of the above embodiments, the present embodiment further optimizes the audio parameter detection apparatus. Fig. 2 is a block diagram of an audio parameter detection apparatus provided in an embodiment of the present invention.
As shown in fig. 2, further, the power amplifier input module 110 further includes: a first input protection unit 114 and a first voltage division unit 115; the power amplifier input unit 111 is connected to the first load unit 112 through the first input protection unit 114, and the first load unit 112 is connected to the control module 140 through the first voltage dividing unit 115.
In this embodiment, the first voltage dividing unit 115 is composed of a plurality of resistors with different resistance values for providing different voltage dividing values, and preferably, the first voltage dividing unit 115 provides two voltage dividing ratios, which are 6:1 and 24: 1. the voltage signal output by the first load unit 112 is divided and then transmitted to the first conversion module 180.
In this embodiment, the first input protection unit 114 is composed of an L C filter circuit and an isolation transformer, the L C filter circuit can filter out the high-frequency modulation signal of the class D power amplifier, and the isolation transformer converts the input differential signal into a single-ended signal.
Further, the audio parameter detection apparatus further includes: the first conversion module 180 is connected with the first voltage division unit 115, and the first conversion module 180 is connected with the control module 140 through the first isolation operational amplifier module 190.
In this embodiment, the first conversion module 180 is configured to convert the ac signal after voltage division output by the first voltage division unit 115 into an effective value of the ac signal, that is, a root mean square value of the ac signal. The first isolation operational amplifier module 190 is used for isolating a high voltage part and a weak current part.
Further, the earphone signal input module 120 includes: the earphone comprises an earphone signal input unit 121, a second input protection unit 122 and a second resistance unit 123, wherein the second input protection unit is respectively connected with the earphone signal input unit and the second resistance unit.
In the present embodiment, the second resistance unit 123 includes a fixed resistance and a voltage dividing resistance subunit. The preferred fixed resistor has a resistance of 32 omega. The voltage division ratio provided by the voltage division resistor subunit is 2: 1.
further, the apparatus further comprises: a second conversion module 210 and a second isolation operational amplifier module 220, wherein the second conversion module 210 is connected to the earphone signal input module 120 and the line input module 130, respectively, and the second conversion module 210 is connected to the control module 140 through the second isolation operational amplifier module 220.
Further, the apparatus further comprises: a touch display module 160 and a power supply module 170; the touch display module 160 and the power supply module 170 are respectively connected to the control module 140; the touch display module 160 is configured to receive a touch input signal of a user and display an audio parameter of the device under test; the power supply module 170 is used for supplying power to the control module 140.
Further, the apparatus further comprises: a switch module 230, wherein the switch module 230 is used to power on the detection device or reset the detection device after use.
It should be noted that the detection signal of the audio parameter detection apparatus is mainly divided into two paths, one path is composed of the power amplifier input module 110, the first conversion module 180 and the first isolation operational amplifier module 190, and is used for measuring high-power audio signals, and the other path is composed of the earphone signal input module 120, the line input module 130, the second conversion module 210 and the second isolation operational amplifier module 220, and is used for measuring low-power audio signals such as earphones and line outputs.
In this embodiment, the operation principle of the detection device is simply described in the sequence of the signal flow.
The working principle of the circuit for measuring the high-power audio signal is as follows: the power amplifier input unit 111 receives a power amplifier signal output by the device under test 150 and loads the power amplifier signal to the resistor in the first load unit 112, and the first load unit 112 can control the relay switching unit 113 to switch a specific resistance value through the control module 140, so as to adapt to different application scenarios. Then, the first voltage dividing unit 115 for the load power amplifier signal output by the first load unit 112 performs voltage division in a ratio of 24:1, sends the divided load power amplifier signal to the first conversion module 180, obtains a voltage effective value of the ac signal through conversion by the first conversion module 180, performs signal isolation by the first isolation operational amplifier module 190, sends the voltage effective value to the analog-to-digital converter in the control module 140 for analog-to-digital conversion, and converts the converted digital signal into an actual output voltage, an actual output power, channel imbalance, channel crosstalk, a signal-to-noise ratio and the like through a programmed software algorithm.
The basic circuit structure for measuring the low-power signal is similar to the circuit structure for measuring the high-power signal, the difference is that the resistor in the second load unit is a fixed resistor, the voltage dividing resistor ratio is 2:1, and the line input is also input to the first conversion module 180 after voltage division. The measured parameter values can be displayed on the touch display screen, and the measurement channels can be switched by touch.
On the basis of the embodiment, the power amplifier input module is further optimized. The power amplifier input unit 111 includes three power amplifier sockets, wherein the first power amplifier socket is a socket whose jack interval is a first interval, the second power amplifier socket is a socket whose pin interval is the first interval, the third power amplifier socket is a socket whose jack interval is a second interval, and the first interval is different from the second interval.
It should be noted that the power amplifier socket is used for connecting the power amplifier output of the device to be detected to the detection device. In order to make compatible design with more boards of equipment to be tested, the electrical connection of the three sockets is the same, and only the distance between the connecting socket pins is different.
Further, in this embodiment, the first power amplifier socket is a power amplifier socket with a jack interval of 2.54mm, and the second power amplifier socket is a socket with a pin interval of 2.54 mm. The third power amplifier socket is a socket with the distance of jacks of 2.0 mm. Fig. 3a is a block diagram of a power amplifier socket according to an embodiment of the present invention, fig. 3b is a block diagram of another power amplifier socket according to an embodiment of the present invention, and fig. 3c is a block diagram of another power amplifier socket according to an embodiment of the present invention; the power amplifier socket in fig. 3a is a socket with a pin pitch of 2.54 mm. The power amplifier socket in fig. 3b is a power amplifier socket with a jack interval of 2.54mm, and the power amplifier socket in fig. 3c is a socket with a jack interval of 2.0 mm. The 4 diodes in 3a are preferably Transient Voltage Supressor (TVS) diodes, and are used for electrostatic protection and protection of subsequent circuits.
Fig. 4 is a circuit diagram of the power amplifier input module according to an embodiment of the present invention, as shown in fig. 4, the first input protection unit includes a first filtering subunit and a second filtering subunit, the first filtering subunit includes a first inductor L1, a second inductor L2, a first capacitor C1, and a second capacitor C2, and the second filtering subunit includes a third inductor L3, a fourth inductor L4, a third capacitor C3, and a fourth capacitor C4.
The first end 1 of the power amplifier input unit is connected with one end of a first capacitor C1 through a first inductor L1, the second end 2 of the power amplifier input unit is connected with one end of a second capacitor C2 through a second inductor L2, the other end of the first capacitor C1 is connected with the other end of a second capacitor C2 and grounded, the third end 3 of the power amplifier input unit is connected with one end of a third capacitor C3 through a third inductor L3, the fourth end 4 of the power amplifier input unit is connected with one end of a fourth capacitor C4 through a fourth inductor L4, and the other end of the third capacitor C3 is connected with the other end of the fourth capacitor C4 and grounded.
It should be noted that block 410 represents the relay switching unit and the load unit, providing resistances of 4 Ω, 6 Ω and 8 Ω. The relay switching unit and the load unit are not limited in this embodiment.
It should be noted that the power amplifier signal output by the device to be tested generally has two channels, and therefore, the power amplifier input module includes two circuits with basically identical structures, in fig. 3, the portion R on the dotted line is used for measuring the parameters of the right channel of the power amplifier, and the portion L under the dotted line is used for measuring the parameters of the left channel of the power amplifier.
Furthermore, the power amplifier input module also comprises two isolation transformers T1 and T2, wherein the isolation transformers convert input differential signals into single-ended signals, a first resistor R1 and a ninth capacitor C9 form a L C filter circuit of a first channel, and a fifth resistor R1 and a tenth capacitor C10 form a L C filter circuit of a second channel.
Further, the first voltage division unit includes: first partial pressure subunit and second partial pressure subunit, first partial pressure subunit includes: a second resistor R2, a third resistor R3 and a fourth resistor R4. The second voltage-dividing subunit comprises: a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The second resistor R2, the third resistor R3 and the fourth resistor R4 are connected in series. The sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are connected in series. Further, the port 11, the port 12, the port 13 and the port 14 are connected with the first conversion module. Ports 11 and 13 provide a partial pressure ratio of 6:1, port 12 and port 14 provide a voltage division ratio of 24:1, output voltage signal.
Fig. 5 is a circuit diagram of the conversion module and the isolation operational amplifier module according to an embodiment of the present invention. As shown in fig. 5, the first conversion module includes a first conversion unit and a second conversion unit, and the first conversion unit includes: the first chip U1, the fifth capacitor C5 and the sixth capacitor C6, the second conversion unit includes: a second chip U2, a seventh capacitor C7, and an eighth capacitor C8; a first terminal of the first chip U1 is connected to the first voltage division unit, a second terminal of the first chip is grounded through a fifth capacitor C5, a third terminal of the first chip U1 is connected to a fourth terminal of the first chip through a sixth capacitor C6, and the fourth terminal of the first chip U1 is connected to the first isolation operational amplifier module; the first end of the second chip U2 is connected with the first voltage division unit, the second end of the second chip U2 is grounded through a seventh capacitor C7, the third end of the second chip U2 is connected with the fourth end of the second chip U2 through an eighth capacitor C8, and the fourth end of the second chip U2 is connected with the first isolation operational amplifier module.
Further, the first isolation operational amplifier module comprises a first isolation operational amplifier a1 and a second isolation operational amplifier a2, wherein a first end of the first isolation operational amplifier a1 is connected to a fourth end of the first chip U1, and a second end of the first isolation operational amplifier a1 is connected to a third end of the first isolation operational amplifier a1 and the control module respectively; the first end of the second isolation operational amplifier A2 is connected to the fourth end of the second chip U2, and the second end of the second isolation operational amplifier A2 is connected to the third end of the second isolation operational amplifier A2 and the control module, respectively.
The utility model discloses a measure electronic equipment audio frequency parameter automation in the production test. By using a measurement and control scheme mainly based on an embedded microcontroller, the whole board card is small in size, the purchase and maintenance cost is greatly reduced, and portable measurement can be realized; the method can measure five common electroacoustic parameters of actual output voltage, actual output power, channel imbalance, channel crosstalk and signal-to-noise ratio, pays attention to common test parameters, omits other unusual test items, improves test efficiency and reduces system operation complexity; a detection circuit is designed by adopting a high-precision chip, voltage detection can be accurate to mV level, and the performance of a detected device is truly reflected. During measurement, the device is only connected to the tested equipment through a wire, can be directly operated through a touch screen, and reads measurement parameters on a display screen in real time without additional equipment; only need select corresponding test condition on the touch-sensitive screen, the system can be through the relay automatic switching, liberates the manpower, and degree of automation is higher.
On the basis of the above-mentioned embodiment, the embodiment of the utility model provides an audio analyzer still provides, audio analyzer contains audio parameter detection device as in any of the above-mentioned embodiment. The embodiment of the utility model provides an audio frequency analyzer includes the utility model discloses the audio parameter detection device that arbitrary embodiment provided possesses corresponding functional module and beneficial effect of this audio parameter detection device.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (11)
1. An audio parameter detection apparatus, comprising: the earphone comprises a power amplifier input module, an earphone signal input module, a line input module and a control module; the power amplifier input module comprises a power amplifier input unit, a first load unit and a relay switching unit; wherein the content of the first and second substances,
the power amplifier input unit is connected with the equipment to be tested and the first load unit and is used for acquiring the power amplifier signal output by the equipment to be tested and outputting the power amplifier signal to the first load unit;
the control module is connected with the relay switching unit and used for switching the on-off state of the relay switching unit according to the received load parameters of the equipment to be tested;
the first load unit is connected with the relay switching unit and the control module and used for providing a load for the received power amplification signal through the switching state of the relay switching unit, obtaining a load power amplification signal and outputting the load power amplification signal to the control module;
the earphone signal input module is connected with the equipment to be tested and the control module, and is used for acquiring an earphone input signal of the equipment to be tested and outputting the earphone input signal to the control module;
the line input module is connected with the equipment to be tested and the control module, and is used for acquiring a line input signal of the equipment to be tested and outputting the line input signal to the control module;
and the control module is used for obtaining the audio parameters of the equipment to be tested according to the received load power amplifier signals, the earphone input signals and the line input signals.
2. The apparatus of claim 1, wherein the power amplifier input module further comprises: the first input protection unit and the first voltage division unit; the power amplifier input unit is connected with the first load unit through the first input protection unit, and the first load unit is connected with the control module through the first voltage division unit.
3. The apparatus of claim 2, wherein the power amplifier input unit comprises three power amplifier sockets, wherein a first power amplifier socket is a socket with a first distance between jacks, a second power amplifier socket is a socket with a first distance between pins, and a third power amplifier socket is a socket with a second distance between jacks, and the first distance and the second distance are different.
4. The apparatus of claim 2, wherein the first input protection unit comprises: a first filtering subunit and a second filtering subunit, the first filtering subunit comprising: first inductance, second inductance, first electric capacity and second electric capacity, second filtering subunit includes: a third inductor, a fourth inductor, a third capacitor and a fourth capacitor,
the first end of the power amplifier input unit is connected with one end of a first capacitor through the first inductor, the second end of the power amplifier input unit is connected with one end of a second capacitor through the second inductor, and the other end of the first capacitor is connected with the other end of the second capacitor;
the third end of the power amplifier input unit is connected with one end of a third capacitor through the third inductor, the fourth end of the power amplifier input unit is connected with one end of a fourth capacitor through the fourth inductor, and the other end of the third capacitor is connected with the other end of the fourth capacitor.
5. The apparatus of claim 2, further comprising: the first conversion module is connected with the first voltage division unit, and the first conversion module is connected with the control module through the first isolation operational amplifier module.
6. The apparatus of claim 5, wherein the first conversion module comprises a first conversion unit and a second conversion unit, the first conversion unit comprising: first chip, fifth electric capacity and sixth electric capacity, the second converting unit includes: the second chip, the seventh capacitor and the eighth capacitor;
the first end of the first chip is connected with the first voltage division unit, the second end of the first chip is grounded through a fifth capacitor, the third end of the first chip is connected with the fourth end of the first chip through a sixth capacitor, and the fourth end of the first chip is connected with the first isolation operational amplifier module;
the first end of the second chip is connected with the first voltage division unit, the second end of the second chip is grounded through a seventh capacitor, the third end of the second chip is connected with the fourth end of the second chip through an eighth capacitor, and the fourth end of the second chip is connected with the first isolation operational amplifier module.
7. The apparatus of claim 6, wherein the first isolation op-amp module comprises a first isolation op-amp and a second isolation op-amp,
the first end of the first isolation operational amplifier is connected with the fourth end of the first chip, and the second end of the first isolation operational amplifier is respectively connected with the third end of the first isolation operational amplifier and the control module;
and the first end of the second isolation operational amplifier is connected with the fourth end of the second chip, and the second end of the second isolation operational amplifier is respectively connected with the third end of the second isolation operational amplifier and the control module.
8. The apparatus of claim 1, wherein the headphone signal input module comprises: the earphone comprises an earphone signal input unit, a second input protection unit and a second resistance unit, wherein the second input protection unit is respectively connected with the earphone signal input unit and the second resistance unit.
9. The apparatus of claim 1, further comprising: the second conversion module is respectively connected with the earphone signal input module and the line input module, and the second conversion module is connected with the control module through the second isolation operational amplifier module.
10. The apparatus of claim 1, further comprising: the touch display module and the power supply module; the touch display module and the power supply module are respectively connected with the control module;
the touch display module is used for receiving a touch input signal of a user and displaying an audio parameter of the equipment to be tested;
the power supply module is used for supplying power to the control module.
11. An audio analyzer, characterized in that it comprises an audio parameter detection device according to any one of claims 1 to 10.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113766410A (en) * | 2021-09-22 | 2021-12-07 | 深圳市天视通视觉有限公司 | Audio detection circuit, audio detection device and audio detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113766410A (en) * | 2021-09-22 | 2021-12-07 | 深圳市天视通视觉有限公司 | Audio detection circuit, audio detection device and audio detection system |
| CN113766410B (en) * | 2021-09-22 | 2023-10-17 | 深圳市天视通视觉有限公司 | Audio detection circuit, audio detection device and audio detection system |
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