The audio analyzer based on LPC2148 designs


Posted on Feb 6, 2014

With the microelectronics and technical fast development of information, the digital technical development represented by one-chip computer changes with each passing day. Because one-chip computer have small, low power dissipation, strong expanding flexibility, micromation and using advantaging such as being convenient control function, and apply


The audio analyzer based on LPC2148 designs
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to the control of various instruments, network communication and data transmission of the computer extensively, real time control and data processing of the industrial automation process. In fact, control by adopting the one-chip computer, can realize the digitization, intelligent and micromation of the instrument. This text realizes the design of the audio analyzer by comparing with and choosing to adopt LPC2148 chip solution. While analyzed to the voice signal, until Fu set up the leaf and vary FFT algorithm fast literary grace this, namely carry on dispersed V Visualization to the voice signal at first, then carry on FFT operation, find the power number value that each discrete frequency of signals is lighted, and get the power spectrum of discretization, calculate in the frequency domain the total power of examining the voice signal finally. On the choice of the processor, can usually choose MCU of 8, 16 or 32-bit microcomputer. But in the course of dealing with the signal, usually can use Fu set up the leaf and vary FFF algorithm fast, so need to carry on a large amount of floating point arithmetic, and a floating point should take up four byteses, so take up a large number of memory in the processing procedure, the operating time of floating point is very slow at the same time, so it is generally difficult to finish operation to adopt 8 ordinary MCUs and 16 MCUs during when sure. Consider magnitude and operation speed...




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