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Audio analyzer A4

A4 is a flexible performance oriented audio analyzer with analog 2-channel output/4-channel input. It supports the expansion of high-performance electroacoustic test options and digital interfaces (BT/HDMI/I2S), and is widely used in multi-channel audio products such as car audio multimedia and Mixing console. In addition, A4 paired with SW12 series switch boxes can expand the number of input and output channels to 192.
  • Features
  • Specification
  • Options and upgrades
  • Resource centre
    • Commodity name: Audio analyzer A4
    • Commodity ID: A4

    A4 is a flexible performance oriented audio analyzer with analog 2-channel output/4-channel input. It supports the expansion of high-performance electroacoustic test options and digital interfaces (BT/HDMI/I2S), and is widely used in multi-channel audio products such as car audio multimedia and Mixing console. In addition, A4 paired with SW12 series switch boxes can expand the number of input and output channels to 192.

    The A4 is a flexible, performance-oriented audio analyzer with analog 2-channel output/4-channel input, supporting high-performance electroacoustic test options and digital interface (BT/HDMI/I2S) expansion, widely used in multi-channel audio products such as automotive multimedia and mixers. In addition, the A4 with SW12 series switch box can expand the number of input and output channels to 192 channels.

    Key features:

    • Analog 2-channel output \ 4-channel input
    • SPDIF/TOSLINK/AES/EBU digital interface is supported as standard
    • Support BT/HDMI/I2S/PDM and other digital interface expansion
    • Complete and powerful electroacoustic analyzer functions
    • Up to 60 test functions, including oscilloscope, spectrum analyzer, continuous fast sweep, etc
    • No programming is required, and full testing is possible in less than 3 seconds
    • SUPPORT FOR LABIEW, VB.NET, C#.NET
    • Automatically generate test reports in various formats
    • Supports Dolby & DTS digital streaming

     

    Some of the tested features:

    • Level/Gain & Gain
    • Frequency Response
    • Total harmonic distortion plus noise THD+N
    • 信噪比/Signal-to-Noise Ratio
    • DC Level DC Level
    • DC Level Sweep
    • Interchannel Phase
    • Scope Monitor/Specturm
    • Frequency Measurement
    • Test recorder Measurement Recorder
    • Step Level Sweep
    • Step Frequency Sweep
    • Compare Encoded Bitstream
    • Common-mode rejection ratio CMRR
    • SINAD
    • Pass/Fail verdict
    • Noise
    • Separation Crosstalk
    • Q-peak noise
    • Level Ratio
    • Input Sample Rate
    • Acoustic Response is measured
    • Speaker parameter measurement Loundspeaker Test
    • PESQ voice quality assessment
    • POLQA subjective sound quality evaluation
    • Impedance curve/TS parameter/impedance/Thiele-Small
    Key words:
    • 分析仪
    • 测试
    • 支持
    • 软件
    • 功能
    • 扫描
    • 电平
    • 接口
    • 输入
    • level
  •    

    • System performance

    Residual THD+N (20kHz BW): -106 dB

    • Source indicators

    Sinusoidal signal frequency range: 2Hz to 80.1kHz

    Frequency accuracy: 3ppm

    IMD test signals: SMPTE, MOD, DFD

    Maximum output amplitude (balanced): 16 Vrms

    Amplitude accuracy (1kHz): ±0.05 dB

    Flatness (20Hz - 20kHz): ±0.01 dB

    Analog output configuration: XLR (balanced) & BNC (unbalanced)

    Maximum digital output sampling rate: 216 kHz

    Sampling accuracy: 3ppm

    Number of bits: 8-24 bits

    Residual jitter: Electrical < 1.5ns fiber < 2.5ns

    Dolby/dts Source: Yes (pre-encoded file)

    • Analyzer indicators

    Maximum rated input voltage: 230Vpk

    Maximum bandwidth: 90 kHz

    IMD test features: SMPTE, MOD, DFD

    Amplitude accuracy (1kHz): ±0.05dB

    Amplitude flatness (20Hz - 20kHz): ±0.01dB

    Residual input noise: 1.3 uV

    Independent harmonic analyzer: d2-d10

    Maximum FFT length: 1.2M points

    DC voltage measurement

    • Common indicators

    Size (WxDxH): 480mm*405mm*153mm

    Weight: 8.5kg±0.5kg

    Working voltage (AC): 220V, 50Hz/100V-240V, 50Hz-60Hz

  • Input and output interface options:

    Audio analyzer

     

    1. AX-BT-RD option

    BT-RD option is currently the most economical solution for Bluetooth audio testing, with built-in Bluetooth wireless and Bluetooth protocol stacks, enabling engineers to make direct measurements of their Bluetooth devices, eliminating the uncertainty and inconvenience of Bluetooth Dongle, making Bluetooth audio testing faster, simpler and more reliable for R&D and production testing.
     

    2. AX-BT-PT option

    BT-PT Bluetooth module is based on the production line test needs and developed Bluetooth function option, which simplifies the pairing connection process of the traditional Bluetooth module, can achieve fast pairing connection in a very short time, has strong Bluetooth compatibility, mainly used in Bluetooth audio product production line or primary R&D testing.

    3. AX-HDMI option

    HDMI+ARC (Audio Return Channel) is a versatile audio monitoring and measurement option, it is powerful, easy to use, accurate measurement results, can be widely used in multimedia products audio quality testing, can provide all standard audio measurement items, including level, signal-to-noise ratio, distortion, phase, crosstalk, group delay, etc.

    4. AX-DSIO option

    The DSIO option adds a multi-channel digital serial interface to the audio analyzer, providing a direct connection to the chip-level interface, which plays a decisive role in the design and development of the board, and its simple use and accurate test results can be widely used in audio quality testing of various digital devices.

     

    Software Options:

    Audio analyzer

    1. AX-SPK-RD option

    SPK-RD provides designers and developers of electroacoustic products with a comprehensive set of test functions and results, including some key acoustic test indicators, a comprehensive set of T/S parameters, time-window-controlled quasi-acoustic response testing of a non-acoustic environment, impedance analysis, and more, this option includes all test functions of the production line version.

    2. AX-SPK-PT option

    SPK-PT is used for rapid testing of electroacoustic product production lines, providing the main index parameter test of loudspeakers, and obtaining all test results in one scan. The results include Rub & Buzz, the necessary set of T/S parameters, impedance amplitude and phase, and a dedicated modulated noise test function to detect air leakage in the speaker.

     

    Audio analyzer

    3. AX-PESQ is based on ITU-T P.862 standard

    Perceptual audio measurement is widely used in mobile phones, VoIP networks, and other device tests to measure how people perceive sound quality. Especially for devices with limited bandwidth or bit rate, parameters such as frequency response/distortion testing using standard sine waves do not effectively reflect device performance, and only a combination of perceptual and electrical audio tests can fully account for device performance.

    PESQ is a widely used perceptual audio measurement primarily for subjective evaluation of speech quality in low-bandwidth devices.

    4. AX-POLQA2 is based on ITU-T P.863 standard

    POLQA2 uses a new generation of POLQA algorithms for subjective assessment of speech quality in wideband voice devices or devices with acoustic coupling. (Inherits PESQ and supports HD voice, 3G, 4G/LTE and VoIP technologies)

     

    5. AX-STIPA option

    AX-STIPA is a plug-in that uses the STIPA method for Voice Delivery Index (STI) testing.

     
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