主动声探测信号的捕获与回波重构电路设计

Design of Capture and Echo Reconstruction Circuit for Active Acoustic Detection Signal

摘要:

针对主动声探测脉冲偶发、短时、超声、单频、大动态的特点，传统的微弱信号采集电路已不能满足对其探测捕获的需求。提出了一种多级放大多路同步采集的电路系统，对预处理的信号进行多级放大。 由 DSP 同时对多级输出信号进行采集与识别，将采集的某路合适信号进行分析并重构回波。该方法有效地提高了系统的实时性，满足实际情况下对主动探测脉冲的捕获与分析重构。

关键词:主动声探测脉冲;信号采集;电路系统设计;回波重构

Abstract:

For the sporadic，short-term，ultrasonic，single-frequency and large dynamic features of active acoustic detection pulse，the traditional weak signal acquisition circuit can not meet the needs of its detection and capture. This paper proposes a multi-stage amplifying and multi-channel synchronous acquisition circuit system， which implements multi-stage amplification on the pre-processed signal. The multi-level output signal is collected and recognized by the DSP at the same time，and a collected channel of appropriate signal is analyzed and reconstructed. This method effectively improves the real-time performance of the system and satisfies the capture and analysis reconstruction of the active detection pulse in practical situation.

Key words:active acoustic detection pulse;signal acquisition;circuit system design;echo reconstruction