【摘要】 本文论述了利用单片机技术和归一化最小均方误差(NLMS)算法来抑制语音回路的声反馈的理论基础、硬件设计和软件设计,给出了程序框图。本研究的创新点就在于用SoC单片机来实现声反馈抑制。更多还原

【Abstract】 Microchip, known as integrated circuit, is a device consisting of a number of connected circuit elements, such as transistors and resistors, fabricated on a single chip of silicon crystal or other semiconductor material. An acoustic echo canceller works in the following fashion: it records the sound going to the loudspeaker and substracts it - in some way - from the signal coming from the microphone. The sound going through the echo-loop is transformed and delayed, and noise is added, which complicate the substraction process. This paper introduces acoustic echo cancellation system based on microchip technology, where the normalized least mean square ( NLMS ) algorithm is used in process optimization design of acoustic echo cancellation. The hardware design,software design and program diagram are given out.更多还原