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公开(公告)号：US5589821A
公开(公告)日：1996-12-31
申请号：US355041
申请日：1994-12-13
CPC分类号： G08B21/0222 , G01S13/84 , G08B21/0227 , G08B21/023
摘要： A system generates an alarm at one unit of the system when a second unit of the system is more than a predetermined distance from the first unit. The system has a first transceiver unit with a first transmitter for transmitting a first reference signal having a phase with respect to a reference source, and a first receiver for detecting a second reference signal having a phase which bears a relationship to that of the first reference signal. There is a second, portable, transceiver unit with a second transmitter for transmitting the second reference signal after receipt of the first reference signal. The first transceiver unit includes a distance resolver for determining the distance between the two transceiver units from the phases of the first and second reference signals, and an alarm, responsive to the distance resolver, for generating an alarm signal if the distance between the two transceiver units is more than a predetermined amount.
摘要翻译： 当系统的第二单元超过距离第一单元的预定距离时，系统在系统的一个单元处产生报警。 该系统具有第一收发器单元，其具有第一发送器，用于发送具有相对于参考源的相位的第一参考信号;以及第一接收器，用于检测具有与第一参考值相关的相位的第二参考信号 信号。 存在具有第二发射机的第二便携式收发器单元，用于在接收到第一参考信号之后发送第二参考信号。 第一收发器单元包括距离分解器，用于根据第一和第二参考信号的相位来确定两个收发器单元之间的距离，以及响应于距离分解器的报警，用于产生报警信号，如果两个收发器之间的距离 单位超过预定量。
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公开(公告)号：US5661460A
公开(公告)日：1997-08-26
申请号：US570866
申请日：1995-12-12
CPC分类号： G08B21/0222 , G01S13/84 , G08B21/0227 , G08B21/023
摘要： A system has a plurality of transceiver units, including a parent unit and one or more portable and wearable child units, for generating an alarm when a child transceiver unit is more than a predetermined distance away from a parent transceiver unit. The distance is determined by the difference in the phase of a reference signal from the time it is transmitted on an rf signal by a parent unit, received and retransmitted by a child unit, and then received again by the parent unit.
摘要翻译： 系统具有多个收发器单元，包括母单元和一个或多个便携式和可佩戴的子单元，用于当子收发器单元离父母收发器单元超过预定距离时产生报警。 该距离由参考信号的相位差由从母单元的rf信号发送的时间的差异决定，由子单元接收和重传，然后由母单元再次接收。
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公开(公告)号：US5031156A
公开(公告)日：1991-07-09
申请号：US449444
申请日：1989-12-12
IPC分类号： G06M7/00
CPC分类号： G06M7/00
摘要： Articles, moving along a delivery path, are counted by directing a stream of pressurized air toward one major surface of the passing articles, the direction of the air stream being transverse to the direction of travel. Sensors arranged about the air stream detect the acoustic signal which varies with changes in the profile of the passing articles, exemplified by signatures. The detected acoustic signal is divided into a plurality of frequency ranges which, in one preferred emboidment, are averaged to reduce the effect of noise which may be present in only limited ones of the frequency bands. The averaged signals are then compared against thresholds to determine the instantaneous state of the articles, exemplified by a signature stream, to generate count signals.
摘要翻译： 沿着输送路径移动的物品通过将加压空气流引导到经过的物品的一个主表面来计数，空气流的方向横向于行进方向。 围绕空气流布置的传感器检测随着通过物品的轮廓的变化而变化的声信号，以签名为例。 检测到的声信号被分成多个频率范围，在一个优选的实施中，它被平均以减少可能存在于仅有限频带中的噪声的影响。 然后将平均信号与阈值进行比较，以确定用签名流示例的物品的瞬时状态，以生成计数信号。
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