Most of our amateur equipment transmits and receives a much broader audio bandwidth and has no special tone filters , so most hear the tones 而大多數(shù)業(yè)余設(shè)備則在發(fā)射和接收的時(shí)候處理更寬一些的聲音頻寬,所以,通過大部分這樣的設(shè)備能夠聽到音頻信號(hào)。
In the commercial equipment , the audio bandwidth tends to be narrower than our amateur equipment and there are circuits installed to filter out the tones so they are truly subaudible 在商業(yè)設(shè)備中,聲音頻寬比業(yè)余設(shè)備更窄些,并且,配備有專門的電路用于過濾音頻,于是,這些音頻信號(hào)真正的成為了“亞音” ,不會(huì)被聽到。