White Noise is a technique for causing a clinical, anaesthetic effect, and has been used in minor surgery and dentistry. The patient listens to a generator of all the audio frequencies of the human ear.
The analogy with Kamatana meditation is quite useful. The noisy mind producing an effect such that the sensations associated with the Heart, at the centre of the chest, are quite unobservable, just as though it were under a kind of local anaesthetic. But as attention is directed at the spot, the mind quietens, the white noise subsides and the sensations within the heart gradually become clear and the practice of mindfulness can continue.