乘数提高反响系统的动态范围

Multiplier Improves the Dynamic Range of Echo Systems
Multiplier Improves the Dynamic Range of Echo
Systems (HA-2556, HA-5177)
Application Note November 1996 AN9515.1



Introduction
In an echo system the returned signal amplitude is a function the time it takes sound to travel approximately one foot
of the distance to the target, and it can be expressed mathe- through air. During the rst portion of the ramp, when the
matically as function of time. An echo system with a xed returned signal is very large, the multiplier gain is small
gain preamp has poor dynamic range because close targets because