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DASS (Digital Audio Analyrer System) is a PC platform based Digital Audio measurement and analysis System developed by German ADM Engineering company specifically for the design, development and quality control of Audio products by Audio manufacturers. It is divided into DAAS3L, DAAS4Pro and DAAS4usb series.

 

 

= use 40kHz, 24 bit, digital/simulation and simulation/digital conversion to generate signals and execute tests

 

 

= frequency and impedance measurement frequency adjustable section resolution

 

 

= phase calculation of frequency and impedance curve and automatic delay correction

 

 

= acoustic measurement line except phase correction

 

 

= group delay line except phase group delay calculation

 

 

= transient response and cumulative spectrum attenuation (waterfall)

 

 

= frequency response curve free tone correction

 

 

= distortion measurement of arbitrary internal signal frequency

 

 

= distortion measurement of external signal

 

 

= distortion and frequency, level evaluation

 

 

= intermodulation distortion measurement: Tim and Dim

 

 

=Thiele small parameter calculation

 

 

= maximum frequency resolution 0.1hz

 

 

= it can be used with the loudspeaker auxiliary design software Akabak, CALSOD and LEAP

 

 

=RT60 with narrowband noise

 

 

= automatic test macro editing, Go/No Go decision

 

 

= drive directivity test turntable to conduct directivity test

 

 

software

 

 

It USES 16-bit or 24-bit D/A and A/D converter to generate test signals and perform calculations, test signals and perform calculations, and the test interface is composed of graphical curves, title samples and information samples. The simple and intuitive test function, graphical operation menu prompt, makes your measurement work convenient.

 

 

hardware

 

 

1) DAAS4Pro: pci4-bit 2-channel module/number, number/module conversion public plug-in card front and rear control box (including power amplifier MIC phantom power source and front amplifier) microphone (15V or 48V)

 

 

2) DAAS4usb: front and rear control box of USB interface (including power amplifier MIC phantom power supply and preamplifier) microphone (15V or 48V)

 

 

DAAS4 pro can realize the online quality control functions of frequency response, polarity, impedance, harmonic distortion, friction & beep, and average sensitivity by purchasing QC Extension software, and all test results can directly generate Excel reports for quality analysis.

 

 

(-) test range of the new DAAS system

 

 

1, frequency divider 2, speaker 3, speaker 4, microphone 5, headset 6, amplifier 7, inductance 8, capacitance 9, resistance 10, room acoustic characteristics

 

 

(ii) DAAS system can generate the following test signals

 

 

1, pink noise 2, white noise 3, longest sequence (MLS)

 

 

The above three signals are used for frequency response test under different conditions.

 

 

4. Sine wave - any frequency can be adjusted for impedance and distortion test

 

 

5. Testing of sine wave combination signal - intermodulation factor

 

 

6. Sequence signal - for harmonic distortion test

 

 

7. PN sequence signal - this signal is coordinated with the spectrum analyzer for frequency response test

 

 

In addition, other signals can be generated at the user's request

 

 

(iii) testing projects and important functions of DAAS

 

 

1. High-speed and precision measurement frequency response curve (maximum 0.3s, resolution: 0.5hz)

 

 

2. High speed and precision measurement of impedance characteristic curve (maximum 0.3s, resolution: 0.5hz)

 

 

3. Calculate the phase and minimum phase of frequency response, and automatically correct the delay.

 

 

4. Calculate the phase and minimum phase of impedance characteristics and automatically correct the delay.

 

 

5. Calculate the data of frequency response curve and impedance curve at any point (such as efficiency). The frequency. Impedance, etc.

 

 

6. Calculate the group delay curve by the phase curve or the minimum phase curve

 

 

7. Correction of free sound field of frequency response curve

 

 

8. Measure trapezoidal response

 

 

9. Measure the waterfall spectrum

 

 

10. Testing of instantaneous and high-speed frequency response and impedance characteristics.

 

 

11. Measure THIELE SMALL low frequency parameters immediately

 

 

12. Test frequency distortion at any point (second to ninth harmonic distortion)

 

 

13. Variable frequency test and intermodulation distortion test

 

 

14. Calculate the total harmonic distortion

 

 

15. Evaluate the relationship between frequency and distortion

 

 

16. Sound pressure and level testing

 

 

17. Loudspeaker (speaker box) internal wiring polarity automatic discriminant display

 

 

18. RT60 delay reverberation test

 

 

19. Performance test of frequency divider

 

 

20. Function of oscilloscope

 

 

Real-time spectrum analysis

 

 

22. As many as 10 sensitivity sampling points can be set arbitrarily

 

 

23. Automatic sensitivity reading of various sensitivity conversion methods

 

 

24. Automatic quality setting management function

 

 

25, ultra-high frequency resolution, with 4096 frequency sampling points (only 512 sampling points for LMS tester)

 

 

In addition, DASS computer audio test system also has a number of auxiliary functions, for example: curve can be arbitrarily amplified. Zoom out and smooth, arbitrarily set the curve resolution. Any frequency band testing. Any test signal exchange. Whether the distance of the test microphone from the speaker is 1M or not, it can be automatically converted into the pre-set sensitivity unit of 1W/m, 0.5w / 0.5m, dBV, dBPa, and so on. Its high speed on-line quality control function provides the guarantee and advanced means for many factories to improve product quality..

 

 

DAAS computer audio test system also provides a very friendly man-machine dialogue, using a Windows interface, all test buttons and test items at a glance. The test results can be quickly stored and printed, and can be saved in PCX file exchange format, which is convenient for typesetting with WORD AUTOCAD PHOTOSHOP. Graphic design software is used together. It can be seen that the function of DAAS is equivalent to the sum of the functions of dozens of conventional devices, while the combination of dozens of conventional devices cannot achieve the test speed and accuracy of DAAS. The excellent performance of DAAS computer audio test system has become the mainstream of digital test field.

 

 

 

 

Curve, microphone, speaker, microphone, audio, SPL electroacoustic tester

 

 

Agency & service:

 

A. Italian CLIO audio test analysis system

 

B. German DAAS audio test and analysis system

 

C. LMS audio test and analysis system

 

D. Us SoundCheck audio test and analysis system

 

E. Taiwan all kinds of frequency - sweeping audio-testing machine, Fo machine, impedance machine, white and pink signal generator

 

F. Horn life test time recording monitor

 

G. Various standard test fixtures: iec-318 artificial ear, ECM artificial mouth, dc-power, VIBOX, etc

 

H. Standard measuring amplifier :LMS amplifier model-1100, CLIO amplifier model-2, model-3, model-4, DAAS amplifier

 

I. SMT environmental sound field testing system software.

 

J. Audio measurement system upgrade service

 

K. All kinds of electroacoustic products measurement consultation

 

L. No noise room (anechoic room) design, planning, inspection, analysis, construction.