Fine talk about acoustic noise Volvo VIDA DiCE method

A. Noise testing steps
System appear noise is to Volvo VIDA DiCE let each modified technician have a headache problem, however, have to master the noise search method, identification and remove skills can easily deal with these problems. Of course, noise have a great part of it is not standardized operation caused by, so to develop good habits can eliminate noise generation. For system noise can be three steps to deal with:

1. Identify
First deal with the noise of the system identification, listen carefully to noise type, pay attention to the following: what kind of symptom? Is what kind of noise? Noise is follow the whole system have? Noise is with volume size change and change? Noise from what when begin? Whether noise with the engine and speed and change? For how long?

2. Isolation
When you identify noise type,   Volvo VIDA DiCE the second step is to analyze the failure circuit part, and will it isolation. Equipment problems were relatively easy to solve, so long as will equipment demolition and repair its function whether there will be a problem to change into a can, in here should pay special attention to, don't immediately will equipment change, because if there was short circuit or reverse equal status, you may burn another station equipment. So shall first will have the problem of equipment interface equipment and environmental check carefully, and then converter to test.
The isolation of the alternative is to skip or disconnect the equipment or circuit, and then check if there is the emergence of the noise.

3. Eliminate
To identify and analyze the noise, the next step is to eliminate noise, the noise can generally from three aspects  Volvo VIDA DiCE  to solve: the car environment, acoustics and electronic.
The car environmental noise mainly through the equipment put the position or connection ways, interior environment affect noise types have mainly clutter noise into, electromagnetic interference, and the other for the car environment caused by the noise.
Acoustic problems mainly is the phase, scattering, and the load disturbance shot problems. Electronic problems about filtering the main processing, power cord, ac signal, earth and other car electric to the influence of the audio system. Electronic processing requirements higher basic knowledge, and to oscilloscope, the signal generator, ford IDS VCM  distortion tester etc instruments have higher understanding. Simple portable radio it is a to hum radiated interference problem dealt with better tools.