Hypersonic effect Hypersonic effect The hypersonic effect is a term coined to describe a phenomenon reported in a controversial scientific study by Tsutomu Oohashi et al., which claims that, although humans cannot consciously hear ultrasound (sounds at frequencies above approximately 20 kHz), the presence or absence of those frequencies has a measurable effect on their physiological and psychological reactions. Numerous other studies have contradicted the portion of the results relating to the subjective reaction to high-frequency audio, finding that people who have "good ears" listening to Super Audio CDs and high resolution DVD-Audio recordings on high fidelity systems capable of reproducing sounds
Radio in the Republic of Ireland commercially in Ireland, and the first attempt to license such since 2002; as well as what will amount to four stations easily receivable in most of Dublin city and county. It is expected these may be the last commercial analogue services to be licensed, as the FM band will be highly saturated in Dublin and the midlands of Ireland. Digital Radio Mondiale (DRM) on Ireland's many unused ITU-allocated medium wave frequencies is expected to be the next round of licensing, particularly as some of these allocations are 15 to 20 kHz wide, which is enough for FM-alike quality with the