Chinese psychologists believe that in addition to human factors, economic and technical feasibility must also be taken into account to control the noise environment. For adequate noise control, it is necessary to consider the whole system composed of noise sources, transmission channels and receivers. Noise control measures can be targeted at the above three departments or any of them. The contents of noise control include:
① Control the noise source. To reduce the noise of the sound source, the industry and transportation industry can choose low-noise production equipment and improve production technology, or change the movement mode of the noise source (such as reducing the vibration of solid sound generators by means of damping ball valve pneumatic butterfly valve, hanging ball valve pneumatic butterfly valve and other measures).
② Stop noise propagation. Reduce noise in the way of sound transmission, control the spread of noise, change the way of noise transmission that has been emitted by the sound source, such as the use of sound absorption, sound insulation, sound barrier, vibration isolation and other measures, as well as the reasonable planning of urban and architectural layout.
③ Reduce noise at the human ear. For the noise protection of the recipient or the recipient organ, if no measures can be taken on the sound source and transmission route, or the acoustic measures taken still cannot achieve the expected effect, it is necessary to take protective measures on the recipient or the recipient organ. For example, workers exposed to long-term occupational noise can wear ear plugs, ear muffs or helmets and other ear protectors.