468-weighting is still demanded by the BBC and many other broadcasters,[REF] with increasing awareness of its existence and the fact that it is more valid on random noise where pure tones do not exist.
While not intended for this application, the 468 curve has also been used (offset to place the 0 dB point at 2 kHz rather than 1 kHz) as "M weighting" in standards such as ISO 21727[REF] intended to gauge loudness or annoyance of cinema soundtracks.