ITU-R 468 noise weighting

ITU-R 468 (originally defined in CCIR recommendation 468-4) is a standard relating to noise measurement, widely used when measuring noise in audio systems. The standard defines a weighting filter curve, together with a quasi-peak rectifier having special characteristics as defined by specified tone-burst tests. It is currently maintained by the European Broadcasting Union who took it over from the CCIR.

It is used especially in the UK, Europe, and former countries of the British Empire such as Australia and South Africa.^{[citation needed]} It is less well-known in the USA where A-weighting has always been used.^{[citation needed]}