The influence of non-audible high frequency noise on the playback sound of audio equipment

In recent audio equipment, induction and inflow of non-audible high frequency noise to audio equipment is increasing more and more due to implementation of personal computer / network connectivity and high resolution capability. Therefore, in this study, we confirmed by actual measurement that the influence of non-audible high frequency noise on the playback sound of audio equipment. From measured results, it is confirmed that the non-audible high frequency noise that has plural frequency components causes the intermodulation distortion (IMD) in audible frequency band.