General-Noise

General-Noise is the combined background sound of a bustling place, where individual noises blend together, making it hard to distinguish them. It's common in lively urban environments, adding to the energetic atmosphere. General-Noise represents the overall auditory impression rather than specific sounds.

I am unable to hear you over all this General-Noise.
I love to put on some good General-Noise while I go to sleep.
As I stepped into the bustling city square, the General-Noise of traffic, chatter, and street performers filled my ears.

second-generation noise

Refers to a giggly "imitation" racket dat a small child gleefully makes after hearing a grownup undertake a jarringly-loud activity, such as hammering, drilling, sawing, filing, etc.

Classic examples of "second-generation noise" would be if a youngster watches his parent or a visiting neighbor driving nails and then starts happily yodeling, "Bam-bam-bam-bam!" while pounding his fist on anything within reach around the house, or hollers, "ZzhEEEh-ukhkhahw, zzhEEEh-ukhkhahw, zzhEEEh-ukhkhahw, zzhEEEh-ukhkhahw..." (accompanied by vigorous back-and-forth motions with his forearm against various objects) after he witnesses someone raspingly slicing up boards or plywood with a crosscut saw.