CN218450540U

CN218450540U - Separated flexible acoustic testing hardware platform

Info

Publication number: CN218450540U
Application number: CN202222651362.XU
Authority: CN
Inventors: 韦岩; 崔顺; 陆跟成
Original assignee: Suzhou HYC Technology Co Ltd
Current assignee: Suzhou HYC Technology Co Ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2023-02-03
Anticipated expiration: 2032-10-09

Abstract

The utility model discloses a separate flexible acoustic testing hardware platform, which comprises a first hardware part, and comprises an MCU (microprogrammed control unit) main control module and a CPLD (complex programmable logic device) module, wherein the main control module is used for realizing the control and communication of the hardware platform, and the CPLD module is used for measuring and collecting data; the main control module is connected with the CPLD module; a second hardware section including a plurality of analog circuit modules providing ports for acoustic testing of a product under test; and the main control module utilizes the various analog circuit modules to test products through the connector module. The design is carried out on the basis of the separation of a digital part circuit and an analog circuit, so that the interference of the digital part to the analog part is reduced, the system structure is optimized, the universality and the expansibility of acoustic testing are enhanced, the development and production cost is greatly reduced, and the development efficiency is improved.

Description

Separated flexible acoustic testing hardware platform

Technical Field

The utility model relates to an acoustics test field. And more particularly to a separate flexible acoustic testing hardware platform.

Background

The existing Audio test hardware platforms are mainly divided into two types, one type is an integrated Audio analyzer, and is represented by series of APx500B, APx52xB and the like of Audio Precision company. The analyzer is reliable and stable in measurement and powerful in function, and is the leading analyzer in the field of audio frequency at present. But the disadvantage is also obvious, such analyzer is too expensive, has long measuring time, is limited by hardware design, and has obvious limitation in multi-channel measurement, which also makes it difficult to be used as a main testing device in mass production in the consumer electronics industry.

Another audio testing hardware platform is to use a professional sound card, such as Fireface. The integrated professional sound card is expensive, focuses on application performance, low delay, multiple channels, multiple interfaces, tuning and the like, and is not stable and reliable in testing performance.

Therefore, it is desirable to provide a separate flexible acoustic test hardware platform designed based on the separation of digital and analog circuits. The basic hardware part and the variable hardware part are separately designed, and the two parts are connected with a board connector by using a 0.8mm SAMTEC board.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a flexible acoustics of disconnect-type tests hardware platform to solve at least one of above-mentioned problem.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a split flexible acoustic testing hardware platform, comprising:

the first hardware part comprises an MCU main control module and a CPLD module, wherein the main control module is used for realizing the control and communication of a hardware platform, and the CPLD module is used for measuring and collecting data; the master control module is connected with the CPLD module;

the second hardware part comprises various analog circuit modules and provides a port for acoustic testing of a product to be tested; and

the main control module utilizes the various analog circuit modules to test products through the connector module.

Preferably, the main control module communicates with the upper computer through a USB CDC and a UAC; the USB CDC comprises a virtualization control serial port and a data port; the UAC is used for acquiring audio data in real time.

Preferably, the main control module configures each analog circuit module through the connector module.

Preferably, the master control module reads the data of the CPLD through the FMC bus.

Preferably, the first hardware part further comprises a plurality of memories connected with the main control module.

Preferably, the second hardware part includes a codec control module, and the plurality of analog circuit modules are connected to the connector module through the codec control module.

Preferably, the analog circuit module further comprises a microphone and a microphone pre-amplification module; the loudspeaker and the loudspeaker output power amplifying module.

Preferably, the second hardware part further includes an impedance test module connected between the connector module and the speaker to collect voltage and current of the speaker to obtain raw data, and transmit the obtained data to the main control module.

Preferably, the coding and decoding control module performs DA conversion on the data from the main control module and outputs the data to the speaker output power amplification module, and converts the signal from the microphone pre-amplification module into a digital signal and transmits the digital signal to the main control module.

Preferably, the first hardware part is a digital part, the analog hardware part is an analog part, and the connector module is a board-to-board connector for signal switching between the digital part and the analog part.

The utility model has the advantages as follows:

the utility model discloses be applied to acoustic test platform with flexible thought, with unchangeable, digital part circuit design on the bottom plate, will change according to the demand, analog part circuit design is on independent module, and the centre is through board to board connector connection, and this kind of design has both reduced the interference of digital part to analog part, has optimized system architecture again, strengthens acoustic test's commonality, expansibility. In addition, the structure can realize targeted test more easily, and an analog circuit can be customized according to a tested product, so that the development and production cost is greatly reduced, and the development efficiency is improved.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 shows a block diagram of an acoustic testing hardware platform according to the present invention;

fig. 2 shows a schematic structural diagram of a first partial example of the acoustic testing hardware platform of the present invention.

Fig. 3 shows a schematic structural diagram of a second partial example of the acoustic testing hardware platform of the present invention.

Detailed Description

In order to explain the present invention more clearly, the present invention will be further described with reference to the preferred embodiments and the accompanying drawings. Similar components in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

As shown in fig. 1, fig. 2 and fig. 3, an embodiment of the present invention takes a test simulation speaker and a simulation microphone as an example, and introduces a separate flexible acoustic test hardware platform, which includes:

the first hardware part comprises an MCU main control module and a CPLD module, wherein the main control module is used for realizing the control and communication of a hardware platform, and the CPLD module is used for measuring and collecting data; the main control module is connected with the CPLD module;

a connector module for connecting the first hardware portion and the second hardware portion,

the main control module tests the product through the connector module by utilizing the various analog circuit modules. Specifically, the utility model discloses use digital part circuit and analog circuit separation to design as the basis. The first hardware part and the second hardware part are designed separately, and the two parts are connected to the board connector by using a 0.8mm SAMTEC board. The first hardware part takes STM32+ CPLD as a core, wherein STM32 mainly realizes USB sound card and control function, and CPLD (Complex Programmable Logic Device) can conveniently realize data measurement, acquisition and other functions. The STM32 and the CPLD are connected through an FMC (Flexible Memory Controller) bus, the hardware platform of the part is kept unchanged, and corresponding STM32 and CPLD programs only need to be written according to the difference of the second hardware circuit. The second hardware portion may be customized for different test products, including but not limited to speakers, microphones, speakers, audio lines, headphones, MIDI keyboards, etc., to customize different circuits. The system formed in this way can conveniently realize the variable circuit part in a mode of fixed production by taking products as guidance due to the separated characteristic, thereby not only improving the flexibility and expansibility of the test platform, but also greatly reducing the cost.

In an optional embodiment, the main control module communicates with the upper computer through a USB CDC and a UAC; the USB CDC comprises a virtualized control serial port and a data port; the UAC is used for acquiring audio data in real time.

Specifically, the main control module is used for communicating with a PC end through a USB CDC and a UAC; the USB CDC is a virtual serial port with two paths, wherein the first path is used as a control serial port for sending a control instruction and upgrading firmware to the main control module by the PC end, and the second path is used as a data port for transmitting test data; the UAC is used for acquiring audio data in real time. The MCU main control module and the PC are connected through a USB BCDC (communication device Class) and a UAC (USB Audio Class), wherein two serial ports are virtualized through the CDC, one serial port is used as a control serial port, a control instruction and Firmware can be sent to the MCU through the PC, and the other serial port is used as a data port and used for transmitting a large amount of data, such as voltage or current test data. The UAC is used for acquiring audio data of the audio equipment in real time;

in an optional embodiment, the master control module configures each analog circuit module through the connector module.

Specifically, the main control module is configured to configure a plurality of analog circuit module chips of the second hardware portion, and set up a gain switching channel. One function of the main control module is as a control module, and the main control module is used for configuring a plurality of chips used by the analog circuit, such as setting gain, switching channels and the like;

in an optional embodiment, the master control module reads the data of the CPLD through the FMC bus.

Specifically, the other function of the main control module is to communicate with the CPLD through the FMC bus to read the measurement data of the CPLD. The CPLD (Complex Programmable Logic Device) module selects an Intel MAX 10 series Programmable Device, a Flash is built in the Programmable Device, programming data are not required to be rewritten into an SRAM from an external memory when the Programmable Device is started, and the Programmable Device is convenient to use and easy to implement. The CPLD is mainly used for high-speed signal measurement and acquisition, and particularly in impedance testing, the advantage of hardware parallelism can easily realize the measurement of voltage and current data at a high sampling rate.

In an optional embodiment, the first hardware portion further comprises a plurality of memories connected with the master control module.

Specifically, the first hardware part further comprises an SDRAM connected to the main control module, and is configured to store impedance test data; and the QSPI Flash is connected with the main control module and used for storing audio small files and program backup data for testing, and the EEPROM is connected with the main control module and used for storing mark bit data and calibration parameter data. The first hardware part also comprises a USB3320 chip connected to the USB2.0ULPI transmitter of the main control module, wherein the USB3320 chip is a USB PHY chip supporting USB2.0, and the MCU does not contain a USB HS PHY chip inside but can be realized through an ULPI interface; the SDRAM is used for storing data, such as data of impedance test and the like; the QSPI Flash is used for storing large data which are not required to be rewritten repeatedly, such as audio small files for testing, program backup and the like, and the EEPROM is used for storing small data, such as flag bits, calibration parameters and the like.

In an optional embodiment, the second hardware portion includes a codec control module, and the plurality of audio analog circuit modules are connected to the connector module through the codec control module.

Specifically, the second hardware part comprises a loudspeaker and a loudspeaker output power amplification module, wherein the loudspeaker output power amplification module is connected between the coding and decoding control module and the loudspeaker, amplifies a signal from the coding and decoding control module and then loads the signal onto the loudspeaker to drive the loudspeaker to sound; and the main control module carries out audio module data transmission with the coding and decoding control module through a serial audio interface.

The core of the coding and decoding control module selects a 24bit Codec chip integrated with ADC and DAC, data from the MCU main control part is subjected to DA conversion through the DAC part and then output to the loudspeaker output power amplification module, and signals from the microphone pre-amplification module are converted into digital quantity through the ADC part and sent to the MCU main control part. The highest sampling rate of the Codec chip supports 192KHz, the THD theory can reach 115dB, and high-quality conversion of audio data can be guaranteed.

And the loudspeaker output power amplification module amplifies the signal from the coding and decoding control module and then loads the amplified signal to a loudspeaker to drive the loudspeaker to produce sound.

In an optional embodiment, the audio analog circuit module further comprises a microphone and a microphone pre-amplification module; the loudspeaker and the loudspeaker output power amplifying module.

Specifically, the microphone preamplification module is connected between the coding and decoding control module and the microphone, and amplifies an analog signal from the microphone and outputs the amplified analog signal to the ADC module of the coding and decoding control module. The second hardware part also comprises a microphone power supply module which is used for supplying power to a 4mA current source so that the analog microphone can work normally.

In an optional embodiment, the second hardware part further includes an impedance testing module connected between the connector module and the speaker to collect voltage and current of the speaker to obtain raw data, and transmit the obtained data to the main control module.

Specifically, the impedance testing part is composed of a series of ADC acquisition circuits, and is mainly used for acquiring voltage and current of the loudspeaker to obtain original data and transmitting the obtained data to the MCU main control module.

In an optional embodiment, the codec control module is configured to perform DA conversion on data from the main control module, output the data to the speaker output power amplification module, convert a signal from the microphone pre-amplification module into a digital signal, and transmit the digital signal to the main control module.

In an alternative embodiment, the first hardware part is a digital part, the second hardware part is an analog part, and the connector module is a board-to-board connector for signal switching between the digital part and the analog part.

Specifically, the connector module uses a 0.8mm SAMTEC board-to-board connector for signal transfer between the digital part and the analog part. The system comprises various common bus interfaces and signals, such as I2C, SPI, SAI, GPIO and the like, and meets the interface requirements of various variable circuits.

The utility model provides a flexible acoustics of disconnect-type tests hardware platform divide into two parts of first hardware part and second hardware part. The first hardware part mainly comprises an MCU main control module and a CPLD module, and is assisted by external devices such as a USB2.0ULPI transmitter, an SDRAM, a QSPI Flash, an EEPROM and the like; the second hardware part relates to a combination of a plurality of modules, and an application mode is described by taking the test of an analog loudspeaker and an analog microphone as an example. The application mainly comprises a coding and decoding control module, a loudspeaker output power amplification module, a microphone acquisition pre-amplification module, a microphone power supply module and an impedance testing part, wherein the two parts are connected through a connector module.

Specifically, taking a simulated microphone test as an example, the working process is briefly described as follows:

step one, connecting the acoustic testing platform with a PC, a loudspeaker and a standard microphone, and placing the microphone and the loudspeaker in a sound insulation box in a relative position fixing mode.

And step two, calibrating the microphone and the loudspeaker through a standard sound source and storing calibration parameters.

And step three, connecting the tested analog microphone to an acoustic test platform.

And step four, testing by matching with an electroacoustic testing system tool, developing and applying by self through LabVIEW or other tools, and analyzing a testing result.

And step five, taking down the tested object, and repeating the step three and the step four, so that the test can be continuously carried out and can be simultaneously carried out in multiple channels. Can be matched with automatic production equipment to improve the production efficiency during application

And step six, if the types of the test products need to be changed (the interfaces are not consistent), the test on various products can be realized only by changing different analog circuit boards and correspondingly updating the programs of the MCU main control part.

The utility model discloses a typical feature is to apply the flexibility thought to the acoustics test platform. The design not only reduces the interference of the digital part to the analog part, but also optimizes the system structure and enhances the universality and expansibility of the acoustic test. In addition, the structure can realize targeted test more easily, and an analog circuit can be customized according to a tested product, so that the development and production cost is greatly reduced, and the development efficiency is improved.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and that other variations or modifications of different forms can be made on the basis of the above description for those skilled in the art, and all the embodiments cannot be exhausted here, and all the obvious variations or modifications led out by the technical solutions of the present invention are still in the scope of the present invention.

Claims

1. A discrete flexible acoustic testing hardware platform, comprising:

a second hardware section including a plurality of analog circuit modules providing ports for acoustic testing of a product under test; and

2. The acoustic testing hardware platform of claim 1, wherein the master control module communicates with an upper computer through a USB CDC and a UAC; the USB CDC comprises a virtualized control serial port and a data port; the UAC is used for acquiring audio data in real time.

3. The acoustic testing hardware platform of claim 1, wherein the master module configures each analog circuit module through the connector module.

4. The acoustic testing hardware platform of claim 1, wherein the master control module reads CPLD data through FMC bus.

5. The acoustic testing hardware platform of claim 1, wherein the first hardware portion further comprises a plurality of memories connected with the master module.

6. The acoustic testing hardware platform of claim 1, wherein the second hardware portion comprises a codec control module through which the plurality of analog circuit modules are connected to the connector module.

7. The acoustic testing hardware platform of claim 6, wherein the analog circuit module further comprises a microphone and a microphone pre-amplification module; the loudspeaker and the loudspeaker output power amplifying module.

8. The acoustic testing hardware platform of claim 7, wherein the second hardware portion further comprises an impedance testing module connected between the connector module and the speaker to collect voltage and current of the speaker to obtain raw data and transmit the obtained data to a master control module.

9. The acoustic testing hardware platform of claim 7, wherein the codec control module performs DA conversion on data from the main control module and outputs the data to the speaker output power amplification module, and converts a signal from the microphone pre-amplification module into a digital signal and transmits the digital signal to the main control module.

10. The acoustic testing hardware platform of claim 1, wherein the first hardware portion is a digital portion, the second hardware portion is an analog portion, and the connector module is a board-to-board connector for signal adaptation of the digital portion and the analog portion.