Testing Technology Research On Cracked Preserved Egg Based On TMS320DM642

Preserved egg is a kind of egg which has particular flavor and rich nutrition. The disunitiness of preserved egg did have a serious effect on the quality of it, and therefore during the process of the manufacturing, the examination and elimination of broken eggs are the key procedures. At the present, we mainly adopt artificial examination which means mass manpower; low production efficiency and can not match the requirement of the manufacturing. Hence to exploit an automatic examination system of broken preserved egg means a lot.This paper adopts the acoustics speciality of the eggshell of preserved egg combined with DSP technology to exam the broken egg. To improve the veracity of the examination, we hit the different positions of the egg, two ends and the middle, band together the 3 times vocality signals to make a comprehensive judgment. Then carries on the confirmation to the preserved egg breakage's analysis result on DSP equipment, and goes a step further to consummate the examination system. The main research content is as follows:(1) Build sound gathering and examination hardware platform. The system use TMS320DM642 processor as its core, and the experiment introduces SEED-VPM642 multimedia experiment case of Hezhongda Company which integrates multi external fixings, and 4-way sound input and output interfaces. Audio frequency equipment TLV320AIC23B chip who exchanges data with McASP interface of DSP can take sample of vocality signals and invert from A/D to D/A or backwards, moreover it can also provide microphone preamplifier or programmable amplifier for input facility like microphone. Realizes the communication of computer and SEED-VPM642 multimedia experiment through XDS560 emluator.(2) Preserved egg breakage examination system's software design. The system applies CCS 6000 2.20.18 as its software developing flat which can edit assembly source code and C-language source code. In this paper we use C-language to compile the detecting program of broken preserved egg. On the other side, DSP chip provides CSL database function which can be used to initialize of DM642 system and design eternal setup parameter. The result can be shown in the PC computer by the connection of CCS2 software and target board through XDS560 emluator and achieves real time detection.(3) For voice signal processing method was studied. the thesis contrives Butterworth-direct-â…¡configuration band-pass filter wipe off noise signals, then according to the sample frequency sure extraction 128 sampling points as valid signal, utilizing short-term energy and zero rate algorithm of effective voice signal extracted, finally makes FFT change to sound signals.(4) Discriminant model and detection system verification.by dint of MATLAB software to analyze the discrete data sequence frequency chart and power chart, and compare the power chart of the intact preserved egg and broken one to fond out the differences and confirm the eigen-parameter, and finally build up distinguish model based on Bayes distinguish theory whose character variables are power chart area, formant frequency, and the average and extreme dispersion of formant frequency, formant breadth (the maximum of power chart breadth). Confirmation preserved egg breakage criterion function on DSP equipment, the discrimination accuracy of good shell eggs and loss of shell eggs is 87.5 and 82.9%.In summary, the examination system performance of preserved egg breakage is stable and the high rate of accuracy.it has the reference value to preserved egg non-destructive inspection research, and lays the foundationfor its further studies.