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    • 8. 发明授权
    • Public address system and method for an urban transit vehicle
    • 城市交通车辆的公共广播系统和方法
    • US07068795B2
    • 2006-06-27
    • US10417383
    • 2003-04-16
    • James D. KennedyJohn R. Rowlette, Jr.
    • James D. KennedyJohn R. Rowlette, Jr.
    • H04R27/00H04B1/00
    • H04R27/00
    • Apparatus and method for allowing an operator of a transit vehicle to make public address announcements to passengers internal and external to the vehicle. The safety of the vehicle and passengers is maintained through providing a hands-free directional microphone having noise canceling characteristics. The microphone is used as an input device for receiving an audio signal and provides the signal to a processing module that converts the signal into a digital signal. The digital signal is then processed by a digital signal processor to cancel undesirable noise common to a transit vehicle. The noiseless signal can then be converted into an analog signal and recorded within the memory of the public address system where, upon needed, the signal can be transferred to an output device such as a speaker system internal or external to the vehicle. After playback, the recorded message can also be easily repeated by means of a repeat switch.
    • 允许过境车辆的操作员向内部和外部车辆的乘客发布公共广播通知的装置和方法。 通过提供具有降噪特性的免提定向麦克风来维持车辆和乘客的安全性。 麦克风用作接收音频信号的输入设备,并将信号提供给将信号转换为数字信号的处理模块。 然后,数字信号由数字信号处理器处理以消除运输车辆所共有的不期望的噪声。 然后,无噪声信号可以被转换成模拟信号并被记录在公用地址系统的存储器中,在需要时可以将信号传送到诸如车辆内部或外部的扬声器系统的输出设备。 播放后,也可以通过重复开关轻松重复录制的消息。