The phrase "irregular sound" is correct and usable in written English.
It can be used to describe a sound that is not consistent or does not follow a regular pattern.
Example: "The irregular sound coming from the engine raised concerns about its performance."
Alternatives: "unusual noise" or "erratic sound".
Of these, the most striking was Billone's 2001 piece "Mani.Long," a ritualistic procession of irregular sound.
Melodic sequences, angular and irregular, sound like Cubist versions of Gregorian chant.
Another player had come in to practice, and in the background there was the quiet, irregular sound of colliding balls.
Luther Dickinson on guitar and Cody Dickinson on drums, who are sons of the rock producer Jim Dickinson, have taken up the scrappy, clattery, irregular sound of juke-joint blues.
There existed a critical value of these parameters beyond which the regular edge tone of high amplitude was replaced by an irregular sound of a much lower level.
At the critical values of the parameters the regular edge tone and the irregular sound switched randomly with an average interval which was much greater than the period of the regular edge tone.
Fixed objects, such as buildings and wires, cause humming or other constant sounds called eolian tones; moving objects, such as twigs and leaves, cause irregular sounds.
Catathrenia (nocturnal groaning) is a rare condition characterized by monotonous irregular sounds that occur during sleep.
Observation points are established, where the women sit quietly, listening for gunshots, keeping a keen lookout for movement, flashlights, or irregular sounds and movements in the bush.
In daily life, we are continuously exposed to temporally regular and irregular sounds.
This case is illustrated in typical passive oddball paradigms in which irregular sounds only elicit MMN, but no higher error response of the brain such as P3a.
