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    • 5. 发明授权
    • Siren detector
    • 警报器探测器
    • US5710555A
    • 1998-01-20
    • US649179
    • 1996-05-17
    • Peter Robert Henderson McConnellPatricia Fern Kavanagh
    • Peter Robert Henderson McConnellPatricia Fern Kavanagh
    • G08G1/0965G08G1/07
    • G08G1/0965
    • A improved siren detector for detecting siren sounds which precess at known warble rates, such as yelp, wail, and high-low, within a selected frequency band. A transducer detects the siren sounds and produces a corresponding electrical output signal. This electrical output signal is filtered to reject signals outside of the selected siren frequency band. The signal is processed to determine the amplitude of the electrical signal, and hence the sound level of the siren sound at the transducer input. This signal is also processed by an amplitude limiter and frequency discriminator to determine the instantaneous frequency of the siren sound. This discriminator is followed by a non-linear filter to remove the FM clicks characteristic of siren sounds having a low signal to noise ratio. Selection filters are used to analyze the precession rates, maximum frequency, minimum frequency, and shape of the precession characteristic to classify the siren as to its type, such as yelp, wail, and high-low. A sound which meets the selection criteria and has a sound level above a predetermined threshold causes the siren detector to trigger signal which drives a preempt output. This preempt output signal is input to a traffic light control system. This alerts the traffic light control system to control the Pedestrian Walk/Don't Walk and traffic lights to cause pedestrians to clear the intersection and to provide a preemptive traffic control signal to a vehicle equipped with the appropriate siren.
    • 一种改进的警报警探测器,用于检测在所选频带内以已知的波峰速率(例如yelp,wail和high-low)进入的警报声。 传感器检测警报声,并产生相应的电气输出信号。 该电输出信号被滤波以拒绝所选择的警号频带之外的信号。 处理信号以确定电信号的幅度,并因此确定换能器输入处的警号声音的声级。 该信号也由幅度限制器和鉴频器处理,以确定警报声的瞬时频率。 该鉴频器之后是非线性滤波器,以去除具有低信噪比的警笛声的FM点击特征。 选择滤波器用于分析进位特征的进动速率,最大频率,最小频率和形状,以便将警笛类型分类为诸如yelp,wail和high-low。 符合选择标准并且具有高于预定阈值的声级的声音导致警号检测器触发驱动抢占输出的信号。 该抢占输出信号被输入到交通灯控制系统。 这样可以提醒交通信号灯控制系统,以控制行人走路/不要步行和交通信号灯,以便行人清除十字路口,并为配备有适当警号的车辆提供抢先的交通管制信号。
    • 7. 发明授权
    • Control signal coding and detection in the audible and inaudible ranges
    • 在可听和听不清的范围内控制信号编码和检测
    • US6133849A
    • 2000-10-17
    • US603413
    • 1996-02-20
    • Peter Robert Henderson McConnellRobert Allan Scragg
    • Peter Robert Henderson McConnellRobert Allan Scragg
    • H04B11/00H04Q1/00
    • H04B11/00
    • A coded siren sound generator and a corresponding detector module are provided which allow uniquely coded tone patterns generated by the coded siren to be detected and processed such that only specific sirens will activate the detector module. In one embodiment, only a few codewords are sent by the transmitter. The receiver looks for the occurrence of one or more of these selected codewords and takes a predetermined action based on programming of the detector. The system may operate at audible or ultrasonic frequencies. In accordance with a further embodiment, audio (either audible or ultrasonic) "packets" are sent by the transmitter These packets contain sufficient information to uniquely identify the vehicle sending the packet and allow the vehicle to send commands and data to the detector. The commands and data may be for purposes such as requesting emergency pre-emption for a left turn at an intersection, requesting straight ahead pre-emption, etc.
    • 提供了编码警报声发生器和相应的检测器模块,其允许检测和处理由编码的警号产生的唯一编码的音调模式,使得仅特定的警报器将激活检测器模块。 在一个实施例中,发射机仅发送几个码字。 接收机寻找这些选择的码字中的一个或多个的发生,并且基于检测器的编程采取预定的动作。 该系统可以以可听或超声频率操作。 根据另一实施例,发射机发送音频(声音或超声波)“分组”。这些分组包含足够的信息以唯一地识别发送分组的车辆,并允许车辆向检测器发送命令和数据。 命令和数据可能是为了在交叉点请求左转弯的紧急抢占,请求直线前进等等。