CN111836181A - High-precision front-rear integrated audio test power amplifier - Google Patents
High-precision front-rear integrated audio test power amplifier Download PDFInfo
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- CN111836181A CN111836181A CN202010748508.5A CN202010748508A CN111836181A CN 111836181 A CN111836181 A CN 111836181A CN 202010748508 A CN202010748508 A CN 202010748508A CN 111836181 A CN111836181 A CN 111836181A
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- power amplifier
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- integrated audio
- audio test
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
Abstract
The invention belongs to the technical field of audio product testing, in particular to a high-precision front-rear integrated audio testing power amplifier. The internal circuit comprises a power supply part circuit of a ring transformer, a 3-channel prepositive amplification and input overvoltage protection circuit, a test MIC power supply and MIC insertion prompting circuit, a 2-channel power amplification and input overvoltage protection and output overload protection circuit, a function key, an LCD display window circuit and a complete machine system control circuit. The front-stage and back-stage integrated audio test device is convenient to operate, simple in structure, free in collocation of the 3-path independent pre-amplification and the 2-path independent power amplification, high in precision, low in distortion and large in bandwidth.
Description
Technical Field
The invention relates to the technical field of audio product testing, in particular to a high-precision front-rear integrated audio testing power amplifier.
Background
A front-stage and rear-stage integrated audio test power amplifier is mainly suitable for measuring electroacoustic characteristic parameters of digital and intelligent voice products such as MIC, earphones, mobile phones, PAD and sound boxes. At present, two sets of front-mounted amplification and power amplification split type equipment are generally available in the market, and the test equipment is large in size, complex in interconnection, poor in compatibility, low in test precision, difficult to operate and high in cost.
Disclosure of Invention
Based on two sets of front-stage amplification and power amplification split devices which are common in the market, the testing device is large in size, complex in interconnection, poor in compatibility, low in testing precision, difficult to operate and high in cost, and the high-precision front-stage and rear-stage integrated audio testing power amplifier is provided.
The invention provides a high-precision front-rear integrated audio test power amplifier which comprises a hardware shell, a power switch, six stainless steel function keys, an LCD (liquid crystal display) screen, an AC (alternating current) input plug, an AC input voltage selection switch, a grounding copper column, a power amplifier end input/output BNC connector and a prepositive end input/output BNC connector. The internal circuit comprises a power supply part circuit of a ring transformer power supply, a three-channel prepositive amplification and input overvoltage protection circuit, an MIC power supply and MIC insertion testing prompt circuit, a two-channel power amplification and input overvoltage protection and output overload protection circuit, a function key, an LCD display window circuit and a complete machine system control circuit.
Preferably, the three-channel independent preamplifier system and the two-channel independent power amplifier system are integrated to form a complete integrated audio test device, the preamplifier and the power amplifier are integrated, various protection circuits are added, power supply of AC110V or AC220V is supported, and a corresponding input voltage gear is selected through a downward-embedded toggle switch according to an AC input voltage value.
Preferably, the front panel comprises six circular stainless steel function keys and an LCD display screen, the current function state of the LCD display equipment is adopted, and the six metal keys are combined to select and set various test items of the equipment.
Preferably, the rear panel has three sets of pre-amplified input and output BNC terminals and two sets of power amplified input and output BNC terminals.
Preferably, the rear panel is a separate low impedance grounded copper post and a sunk AC input voltage diverter switch.
Preferably, the pure copper wire-wound toroidal transformer and the multi-path low-noise direct-current voltage power supply part circuit are connected with an environmental ground wire through a rear panel grounding copper column, so that the equipment is ensured to be grounded safely and reliably.
Preferably, the independent three-channel preamplifier and input overvoltage protection circuit and the test MIC power supply and MIC insertion prompting circuit have the function of selecting bias voltages of 2.0V, 2.7V and 24V to supply power for testing MIC. The testing frequency range is 7Hz-110KHz, and gains of-10 dB, 0dB, 10dB and 20dB are provided; the device can independently supply power to three measuring sensors (MIC, vibration sensor and artificial ear) for measurement at the same time; each channel has an independent input signal overvoltage protection function, and the maximum output power of the single channel of the post-stage power amplification is 25W @4 omega. The test frequency range is 10Hz-80KHz, and gains of 0dB, 20dB and 26dB are provided and can be selected. Can drive two-way loudspeakers (stereo earphone, single loudspeaker, sound box, artificial mouth) to work at the same time; each channel has independent input signal overvoltage protection and output overload protection functions.
Preferably, the independent two-channel power amplification and input overvoltage protection and output overload protection circuit.
The beneficial effects of the invention are as follows:
the front-stage and back-stage integrated audio test device is convenient to operate, simple in structure, free in collocation of the 3-path independent pre-amplification and the 2-path independent power amplification, high in precision, low in distortion and large in bandwidth.
Drawings
FIG. 1 is an exploded view of a high-precision front-rear integrated audio test power amplifier according to the present invention;
FIG. 2 is an overall appearance diagram of a high-precision front-rear integrated audio test power amplifier according to the present invention;
FIG. 3 is an internal configuration diagram of a high-precision front-rear integrated audio test power amplifier according to the present invention;
FIG. 4 is a rotation diagram of the internal structure of a high-precision front-rear integrated audio test power amplifier according to the present invention;
fig. 5 is a functional block diagram of a high-precision front-rear integrated audio test power amplifier provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-5, the high-precision front-rear integrated audio test power amplifier provided by the invention comprises a hardware shell, a power switch, six stainless steel function keys, an LCD display screen, an AC input plug, an AC input voltage selection switch, a grounding copper column, a power amplifier end input/output BNC connector and a preposition end input/output BNC connector; the internal circuit comprises a power supply part circuit of a ring transformer power supply, a three-channel prepositive amplification and input overvoltage protection circuit, an MIC power supply and MIC insertion testing prompt circuit, a two-channel power amplification and input overvoltage protection and output overload protection circuit, a functional key and LCD display window circuit and a complete machine system control circuit.
In the invention, a three-channel independent preamplifier system and a two-channel independent power amplifier system are integrated into a whole to form a complete integrated audio test device, and the preamplifier and the power amplifier are integrated into a whole and various protection circuits are added; and the power supply of the AC110V or the AC220V is supported, and the corresponding input voltage gear is selected by the embedded toggle switch according to the AC input voltage value.
In the invention, six round stainless steel functional keys and an LCD display screen on a front panel adopt the current functional state of the LCD display equipment, and six metal keys are combined to select and set various test items of the equipment.
In the invention, three groups of pre-amplification input and output BNC terminals and two groups of power amplification input and output BNC terminals of the rear panel are arranged.
In the invention, the back panel is provided with an independent low-impedance grounding copper column and a sinking type AC input voltage switch.
In the invention, the pure copper winding ring transformer and the multi-path low-noise direct-current voltage power supply part circuit are connected with the environmental ground wire through the rear panel grounding copper column, thereby ensuring the safe and reliable grounding of the equipment.
In the invention, independent three-channel preamplification and input overvoltage protection circuit and test MIC power supply and MIC insertion prompting circuit, the pre-stage preamplification single channel can select bias voltage of 2.0V, 2.7V and 24V to supply power for testing MIC; the testing frequency range is 7Hz-110KHz, and gains of-10 dB, 0dB, 10dB and 20dB are provided; the device can independently supply power to three measuring sensors (MIC, vibration sensor and artificial ear) for measurement at the same time; each channel has an independent input signal overvoltage protection function, and the maximum output power of the single channel of the post-stage power amplification is 25W @4 omega. The test frequency range is 10Hz-80KHz, and gains of 0dB, 20dB and 26dB are provided and can be selected; can drive two-way loudspeakers (stereo earphone, single loudspeaker, sound box, artificial mouth) to work at the same time; each channel has independent input signal overvoltage protection and output overload protection functions.
In the invention, the independent two-channel power amplification and input overvoltage protection and output overload protection circuit.
The working principle is as follows: inserting a standard special test MIC into a preposed input BNC interface of any channel, connecting a corresponding preposed output BNC to the input end of a test sound card, and selecting a bias power supply voltage and a gain value of the corresponding preposed channel through a function key; then connecting the tested loudspeaker to a BNC interface at the output end of any channel of the power amplifier, connecting the corresponding power amplifier input BNC to the output end of the test sound card, and selecting the gain value of the corresponding power amplifier channel through a function key; in a test environment, an MIC is aligned to a tested loudspeaker according to a standard distance and fixed, the test environment is built, a test PC sends a standard frequency sweep sound source signal through a sound card to drive the loudspeaker to sound, the MIC collects an audio signal of the loudspeaker and inputs the audio signal into the test PC through the sound card, and a test result is given after software comparison and analysis.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The utility model provides a high accuracy front and back level integral type audio test power amplifier, includes hardware shell, switch, six stainless steel function buttons, LCD display screen, AC input plug, AC input voltage select switch, ground connection copper post, power amplifier end input/output BNC joint, leading end input/output BNC joint. The internal circuit comprises a power supply part circuit of a ring transformer power supply, a three-channel prepositive amplification and input overvoltage protection circuit, an MIC power supply and MIC insertion testing prompt circuit, a two-channel power amplification and input overvoltage protection and output overload protection circuit, a function key, an LCD display window circuit and a complete machine system control circuit.
2. The high-precision front-rear integrated audio test power amplifier of claim 1, wherein the three-channel independent pre-amplification system and the two-channel independent power amplification system are integrated to form a complete integrated audio test device.
3. The high-precision front-rear integrated audio test power amplifier according to claim 1, wherein the front panel comprises six circular stainless steel function keys and an LCD display screen.
4. The high-precision front-rear integrated audio test power amplifier of claim 1, wherein the rear panel comprises three sets of pre-amplifier input and output (BNC) terminals and two sets of power amplifier input and output (BNC) terminals.
5. The high-precision front-rear integrated audio test power amplifier according to claim 1, wherein the rear panel comprises independent low-impedance grounding copper cylinders and sinking type AC input voltage switches.
6. The high-precision front-rear integrated audio test power amplifier according to claim 1, wherein the pure copper wire wound toroidal transformer and the multi-path low-noise DC voltage power supply part circuit.
7. The high-precision front-rear integrated audio test power amplifier according to claim 1, wherein the independent three-channel front-amplifying and input overvoltage protection circuit and test MIC power supply and MIC insertion prompting circuit.
8. The high-precision front-rear integrated audio test power amplifier according to claim 1, wherein the two independent channels are power amplification and input overvoltage protection and output overload protection circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010748508.5A CN111836181A (en) | 2020-07-30 | 2020-07-30 | High-precision front-rear integrated audio test power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010748508.5A CN111836181A (en) | 2020-07-30 | 2020-07-30 | High-precision front-rear integrated audio test power amplifier |
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| CN111836181A true CN111836181A (en) | 2020-10-27 |
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| CN202010748508.5A Pending CN111836181A (en) | 2020-07-30 | 2020-07-30 | High-precision front-rear integrated audio test power amplifier |
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Citations (7)
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| CN101150688A (en) * | 2007-11-05 | 2008-03-26 | 北京五科通力科技发展有限公司 | High-power digital power amplifier integrated system for digital film player |
| US20140348335A1 (en) * | 2013-05-23 | 2014-11-27 | Listen, Inc. | Audio measurement amplifier |
| CN204272365U (en) * | 2014-10-31 | 2015-04-15 | 陈晓庭 | Alert ring electric whistle control circuit of audio power amplifier |
| CN204537577U (en) * | 2015-03-12 | 2015-08-05 | 浙江海洋学院 | Based on the Experiment of Electronic Technology platform of sound amplifier |
| CN206283671U (en) * | 2016-12-20 | 2017-06-27 | 深圳市桥桥科技有限公司 | Professional audio electroacoustical measurement power amplifier |
| CN206726010U (en) * | 2017-05-09 | 2017-12-08 | 东莞市卓品电子科技有限公司 | A kind of Bluetooth function test equipment |
| JP2018170545A (en) * | 2017-03-29 | 2018-11-01 | オンキヨー株式会社 | Signal analyzer, signal analytic program, program storage medium and signal analysis method |
-
2020
- 2020-07-30 CN CN202010748508.5A patent/CN111836181A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101150688A (en) * | 2007-11-05 | 2008-03-26 | 北京五科通力科技发展有限公司 | High-power digital power amplifier integrated system for digital film player |
| US20140348335A1 (en) * | 2013-05-23 | 2014-11-27 | Listen, Inc. | Audio measurement amplifier |
| CN204272365U (en) * | 2014-10-31 | 2015-04-15 | 陈晓庭 | Alert ring electric whistle control circuit of audio power amplifier |
| CN204537577U (en) * | 2015-03-12 | 2015-08-05 | 浙江海洋学院 | Based on the Experiment of Electronic Technology platform of sound amplifier |
| CN206283671U (en) * | 2016-12-20 | 2017-06-27 | 深圳市桥桥科技有限公司 | Professional audio electroacoustical measurement power amplifier |
| JP2018170545A (en) * | 2017-03-29 | 2018-11-01 | オンキヨー株式会社 | Signal analyzer, signal analytic program, program storage medium and signal analysis method |
| CN206726010U (en) * | 2017-05-09 | 2017-12-08 | 东莞市卓品电子科技有限公司 | A kind of Bluetooth function test equipment |
Non-Patent Citations (1)
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| 骆旭坤: "基于Proteus的音频功率放大器的设计与仿真", 《佛山科学技术学院学报(自然科学版)》 * |
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Application publication date: 20201027 |