公开(公告)号：US3824464A

公开(公告)日：1974-07-16

申请号：US37937873

申请日：1973-07-16

Applicant: HONEYWELL INC

Inventor： ROTIER D ,  SAWAMURA R

IPC: G01S7/527 ,  G01S11/14 ,  G01S15/10 ,  G04F10/04 ,  H03K5/153 ,  G04F11/06 ,  G01S9/06 ,  H03K5/20

CPC classification number: H03K5/153 ,  G01S7/527 ,  G01S11/14 ,  G01S15/101 ,  G04F10/04

Abstract: Pulse detection circuitry for accurately measuring the time for transmission of a train of acoustical energy pulses between a transmitter and receiver. One of the pulses has significantly greater amplitude than the other pulses in the train and has a negative-going zero crossing which occurs at a predetermined time in the pulse train. A peak detector and charge sensor is connected to the receiver. The signal from the receiver is also provided to a negative zero crossing detector which generates pulses to start a timer in response to each negative-going zero crossing. A peak detector and charge sensor also connected to the receiver detect when the pulse preceding a negative-going zero crossing is greater in amplitude than preceding pulses and reset the counter upon such detection. A data gate which increases system noise rejection is also disclosed.

Abstract translation: 脉冲检测电路，用于精确测量在发射机和接收机之间传输一串声能脉冲的时间。 一个脉冲具有比列车中的其它脉冲明显更大的振幅，并且在脉冲串中的预定时间发生负向零交叉。 峰值检测器和电荷传感器连接到接收器。 来自接收机的信号也被提供给负零交叉检测器，其产生脉冲以响应于每个负向零交叉来启动定时器。 还连接到接收器的峰值检测器和电荷传感器检测在负向过零点之前的脉冲幅度大于先前脉冲的幅度，并在这种检测时复位计数器。 还公开了一种增加系统噪声抑制的数据门。