Active horn loudspeaker with automatic start-stop function

The utility model discloses an active horn loudspeaker with an automatic start-stop function. The active horn loudspeaker comprises a horn loudspeaker body, a power amplifier control module, an audio input module, a timing module, a second operational amplifier control circuit and a power supply module, the device satisfies the function of an active horn, supports wide sensitivity input, outputs high level to control a power amplifier chip and request to open loudspeaker output when detecting external audio input, and delays 5 seconds to close loudspeaker output when detecting no external audio input, thereby achieving the purposes of saving energy, protecting environment and prolonging the service life of the power amplifier loudspeaker. And meanwhile, three-stage amplification comparison is adopted, so that noise input can be shielded. 本实用新型公开了一种带自动启停功能的有源号角扬声器，包括号角扬声器本体、功放控制模块、音频输入模块、计时模块第二运放控制电路以及电源供电模块；本装置满足有源号角的功能，支持宽灵敏度输入，当检测有外部音频输入时，输出高电平控制功放芯片，请求打开扬声器输出，当检测到外部没有音频输入时，延时5秒关闭扬声器输出，达到节能环保和延长功放扬声器的使用寿命目的