Application And Research Of Acoustic Communication Protocol In TV Interaction

With the rapid growth of the national economy,people's consumption level has been greatly improved.Intelligent equipment has become a necessity in people's daily life.The popularity of smart devices has enabled the near field communication technology to have a suitable application scenario.In the current multi field communication technology,acoustic communication technology has the characteristics of convenient use and low hardware requirements,so that it is suitable for equipment matching,information jump,small data transmission and other scenes.The mode of TV interaction is less than that of TV,and the interactive information of TV can be transmitted by sound wave.Therefore,the application of acoustic communication protocol in TV interactive scene has a certain research prospect.This paper mainly studies a kind of TV interactive acoustic communication protocol with high frequency sound as the medium,and realizes the TV interactive system based on the acoustic communication protocol.The main work of this paper is as follows:(1)A voice communication protocol in TV interactive scenario is proposed.In this paper,the transmission characteristics of acoustic wave in the air and the audio characteristics of the computer loudspeaker and the mobile microphone are tested.The auditory characteristics of the human ear,the channel coding principle in the digital communication system and the signal modulation and demodulation technology are studied.On this basis,we compare and analyze the encoding and decoding characteristics of RS codes and convolutional codes in channel coding and the ability of error correction,and select RS codes as channel coding schemes.The 8FSK modulation technology is used to modulate the carrier signal,and the frequency points of the acoustic communication are determined.The range of the protocol coding is expanded through the mapping combination.The demodulation scheme selects the Goetzel algorithm with the time complexity lower than the FFT spectrum algorithm.The structure of the data packet in the communication protocol is designed.Through the experimental simulation of the acoustic communication protocol,the experiment error rate under the conditions of different communication distance and communication rate is tested,and the feasibility of the acoustic communication protocol is verified.(2)A TV interactive system based on sonic communication protocol has been implemented.On the basis of the sound results of the acoustic communication protocol experiment simulation,the software architecture and interface of the TV interactive system based on the acoustic communication protocol are designed with the object oriented idea.The system sending terminal is successfully realized in the Windows platform,the system decode terminal is realized in the IOS platform.At last,the operation demonstration of the TV interactive system is carried out,and the performance of the system is tested.The test results are accurate and effective.It has reached the demand of TV interaction and has certain application value.