Many people think of electromagnetic interference (EMI) as disturbance in TV and radio waves. However, with the emergence of RF technology, today's EMI often appears in various situations caused by digital devices interfering with each other. One example is common mode noise appearing in differential transmission signals passing through USB cables. Delicate and precise noise suppression technology that suppresses higher harmonic waves occurring from mutual interference between bi-directional digital signals, yet does not disturb the signal waveform is required.Murata is tackling this new interference problem of the new era by developing new technology such as a line of noise suppression components for various circuits, conducting field experiments at one of the largest electromagnetic anechoic chambers in the industry, and releasing noise suppression simulation software for users.