摘要
在物联网平台下,设计饭堂自动快速计价系统,提高饭堂的工作效率。提出一种基于近场通讯的DSP数字信号处理的物联网下的饭堂自动计价系统设计方法。进行了系统的总体设计和模块化硬件设计,饭堂自动计价系统主要分为价格信息的发射模块、信息接收模块、信息处理模块和输出模块等,输入信号经过变阻器分压送到TDA8920BTH的输入引脚,TDA8920BTH完成对输入信号的PWM调制、调制波的功率放大输出。采用近场通讯原理设计接收电路,接收电路主要任务是将接收通道、参考通道两路信号经过放大、滤波、阻抗变换等预处理后送入A/D进行采样,低通滤波选用AD公司AD712465,组成二阶低通滤波器,采用BLR(基线恢复器)进行输入信号的倍频均衡处理,完成系统的集成设计。仿真结果表明,采用该系统进行饭堂自动计价控制,具有较好的稳定性和准确性,工作效率较高。
In the IOT platform,automatic pricing system design to improve the working efficiency of the canteen. This paper presents an automatic pricing system design method of near- field communication DSP digital signal processing under the Internet of things based on the dining hall. The paper researches the system overall design and modular hardware design. Canteen automatic pricing system mainly consists of price information transmitting module and information receiving module,information processing module and output module etc. Input signal after rheostat points pressure delivered to TDA8920 BTH input pin,and TDA8920 BTH completed the input signal of PWM modulation,the modulation wave power amplifier output. The near field communication principle is applied to design receiving circuit,through which the main realized task is pretreated,including receive channel and reference channel signals after amplification,filter,impedance transforming into the A/D sampling,low pass filtering selecting ad company AD712465,consisting of a second- order low-pass filter,and using the BLR（ baseline restorer） to achieve frequency equalization of the input signal processing,therefore completing system integration design. Simulation results show that using the system to realize canteen automatic pricing control,has good stability,accuracy and high work efficiency.
出处
《智能计算机与应用》
2015年第6期94-97,共4页
Intelligent Computer and Applications
基金
2012广东省质量工程人才培养实验区项目(粤教高函[2012]204号)
2015年度广东省大学生创新创业训练计划项目(201513656018)
关键词
饭堂
自动计价系统
物联网
近场通信
Canteen
Automatic Pricing System
Internet of Things
Near Field Communication
