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随着近代工业的发展,城市噪声有愈来愈大的变化趋势。城市噪声主要来自交通运输、工业生产和公共活动,其中汽车噪声是目前城市环境噪声的主要来源。因此,有必要加以控制,控制的办法之一就是降低汽车电喇叭声级。按JB 2552—79标准规定汽车用电喇叭的声级可高达118 dB(A)。那么,据城市的不同情况,使汽车用电喇叭声级降到105~108dB(A)后还能起警报信号作用则是当务之急了。
With the development of modern industry, there is a growing trend of urban noise. Urban noise comes mainly from transportation, industrial production and public activities, of which car noise is the main source of urban environmental noise. Therefore, it is necessary to be controlled, one of the ways to control is to reduce the car horn level. According to JB 2552-79 standard car audio horn sound level up to 118 dB (A). So, according to the different situations of the city, it is imperative that the alarm level of the electric horn of a car be reduced to 105 ~ 108dB (A) after the warning signal is applied.