Mitsubishi Electric

Mitsubishi Electric Addresses EMC of DIATONE Automotive Navigation/Audio System

Company Profile

The Mitsubishi Electric Group operates on the corporate principle of contributing to creating a vibrant and affluent society by enhancing its technologies, services, and creative powers, as a leader in the manufacture and sales of electric and electronic equipment used in energy and electric systems, industrial automation, information and communication systems, electronic devices, and home appliances.

The Design Challenge

Mitsubishi Electric Corporation brings fun and comfort to the in-car environment with car navigation systems that display easy-to-read maps with simple operations, car audio systems that produce high quality sounds, and infotainment systems that provide a host of useful information. These systems, marketed under the DIATONE brand name, require the highest sound quality, which can be compromised through electromagnetic interference (EMI) among these electronic systems. Therefore, electromagnetic compatibility (EMC) analysis is extremely important. In the past, the design team performed manual EMC analysis, which took a long time and required repeated empirical prototyping in order to obtain acceptable quality. This approach led to design uncertainty, cost overruns, and product release date delays. 

The Solution

Mitsubishi chose NI AWR Design Environment, specifically Microwave Office circuit design software and AXIEM EM analysis software, to perform rigorous analysis of the audio electronics of the navigation system’s circuit board design. The new EMC solution addressed the following areas: specification of the radiated noise through noise measurements obtained from a specially developed automatic measurement system, analysis of the transmission path and all of the system’s EM radiation noise using Microwave Office and AXIEM, and the design of countermeasures to reduce EM radiation and susceptibility. The new methodology decreased overall analysis times by a factor of 10, which reduced design costs by more than 50 percent.

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