The term 'persistent sound' is correct and usable in written English.
You can use it to describe any sound that is continuous or repeated over a period of time. For example, "The persistent sound of the cicadas filled the summer air."
Then there was the persistent sound bleed, creating interference from all directions.
A few hours later, she could hardly rouse herself when a persistent sound broke into her sleep — the doorbell, she eventually determined, never having heard it before.
Infrasound monitors do the same job for the atmosphere, picking up the inaudible but remarkably persistent sound waves that circle the world when a bomb goes off.
On rainy days, I wandered from room to room in that big house, cocooned by the rushing, persistent sound of the rain sluicing across the slate roof, overflowing in the gutters and downpipes.
One Parisian concert review, quoted by Liszt scholar Dana Gooley, suggests the first stirrings of modern pop fandom: "The ecstatic audience, breathing deeply in its rapt enthusiasm, can no longer hold back its shouts of acclaim: they stamp unceasingly with their feet, producing a dull and persistent sound that is punctuated by isolated, involuntary screams".
But the Israeli-Lebanese border has remained remarkably quiet since Israel's army retreated to its side of it on May 24th, ending a 22-year occupation.The most persistent sound on the border these days is not Wagner's martial bombast but the plonk and tinkle of vans bringing ice cream to merry-makers.
The World Health organisation, for example, says that persistent sounds of just 30 decibels, equivalent to someone whispering in a library, are enough to disturb sleep patterns.
"It sounds like tinnitus," she said: a persistent ringing sound brought on by exposure to extreme loudness, it can just disappear, but generally it does not go away.
Despite a persistent alarm sound that caused the curtain to be briefly lowered, the dancers offered lively and charming performances.
In other neighborhoods around the globe, however, Mr. Ciofalo has company, other people who complain of hearing a persistent humming sound, usually when they are in their homes seeking peace and quiet from a busy world.
It is a thin, persistent reeling sound, which is so high-pitched that it can be inaudible to some individuals.
