We use the PXI-1042Q computer from National Instruments (referred to as NI), an American business instrument company for testing:

The PXI-1042Q product of American business instrument company is a professional industrial computer case, and it becomes an industrial-grade computer with a dual-core controller (Due Core Controller). This computer is anti-vibration and anti-interference. It can skewer seven computer cards with different functions. For example, instrument control card GPIB (built-in), data acquisition card (PXI-4472 (DSA card) high-speed real-time sampling 24bits high precision, which is higher than 0.0001V accuracy, SNR reaches 110dB), digital input and output card (PXI6508 , 96-point control). Cooperate with our company's electronic interface and NI's virtual software LabVIEW 7.1 (30 years in Europe and the United States) and software management program Teststand, running on the Windows operating system, different levels and different functions of the computer card can be made It's time for all kinds of automated data acquisition control and testing.

NI’s Teststand will call and execute the corresponding LabVIEW software subprogram (VI) when running in the main framework, and we have compiled the functions such as THD.VI, dB.VI, etc., etc. Called and operated by Teststand. In the future, we can add new component VIs to the DVD testing software. For example, we need to change the testing method for quality. (Note: The software does not open the original code, and can be used directly in the form of a module. When there are new functions in the future, we will quote, and the customer engineer of the VI subprogram of the new function can directly add it to the Teststand main framework for use)

PXI-1042 is fully controlled by Teststand (using the electronic interface signal pre-processing box to control the corresponding functions received by the Dummy prototype panel, such as the CD button and the Play button and the simulation application test form) when UUT (audio machine) reads (Play) 1KHz After (the most sensitive signal of the human ear), through the speaker output, we can obtain the following information: (corresponding to the standard of the specification)

a) The left channel strength index dB (it will not be reached when the power amplifier part is broken)

b) Is the left channel audio correct? (It will not be 1KHz when the DSP board is badly decoded)

c) Left channel distortion rate THD% (If the DSP board is decoded badly, the data will not be lost)

d) Left channel clutter noises (the UUT internally inserted the wrong wire or dry winding or the power board capacitor is bad)

e) The difference between left and right channel separation (same as above)

f) The signal-to-noise ratio (S/N) of the left channel is poor (UUT circuit design has poor suppression of environmental noise, or bad components)

g) The signal-to-noise ratio (S/N) of the right channel is poor (UUT circuit design has poor suppression of environmental noise, or bad components)

h) Frequency response test can be added.

The above computer PXI tests from a) to h) are actually simulating the sensations of the human ears and brain.

i) Whether the sound is pleasing to the ears (frequency, dB level, frequency response)

ii) Does the music have high circumflex (frequency response, high school low frequency analysis)

iii) Whether the division is clear (S/N is high, THD, /Noise is low)

iv) Does the music played by the UUT unit touch the soul (Sense of Sentimental)

If it can meet i) to iv), it is basically equivalent to the computer analysis data that meets the above a) to g), and the difference between humans and computers is that the computer PXI quantifies human feelings!