Research And Application Of Telephone Recording System Base On USB

With the rapid development of the social economy and communications industry, the trend of the networks of telephone and computers penetrate into each other is evidently accelerating, which brings the telephone recording system into digital times, this paper proposes to design a external USB telephone recording box, it connect telephone and computer achieve automatic recording function..The telephone recording box designed in this paper,connect the telephone and telephone lines and computer connection as a whole, it can record each call, and stored audio files in the computer’s hard drive, so we can give full play to the advantages of computer in Management functions, realize two major network’s connections.In schematic design, using the DSP as the core of the signal processor and controller, building the system around the DSP module. First, DSP through the hang up detection circuit to realize automatically recording function. Second, using a serial port McBSP on DSP connect the AD module to achieve signal acquisition. Finally, the audio signals processed by DSP transfer to the computer through the USB interface circuit.In the specific design, utilizing the modular design thinking, The telephone recording system is designed based on VC5402,it mainly includes data acquisition module and data transmission module two parts. This paper given the realization method of every major modules, respectively from the hardware circuit and software design, the data acquisition module can be further divided into detection module for the automatic recording, pre-processing circuit module, AD converter module. When the DSP module detected the start signal of recording, voice signal processed by differential circuit transferred into the AD converter module, data transmission module mainly to realize data transmission of digital phone via USB interface real-time, and stored in the computer hard drive, so as to complete digital recording function, and achieve telephone recording system based on the USB interface.This paper introduces the purpose and significance of the subject, as well as domestic and international research status, problems and development trend. Then gives the overall system design goals, and then respectively from the hardware and software design give out main module realization method of system function, Finally, given the system function test.