Design Of The Telephone Record System Used In The Meeting-room Of Prison

In the meeting room of prison and detention center, the recording of interviewphones which are used to help the prisoners to communicate with their family is oneof the most important kinds of data. it is the most important way to understand thethoughts and emotions of inmates and is also important to obtain the informationwhich can help to solve the cases. Therefore, the automatic recording system ofinterview phone is a important equipment for the prison and detention center. Withthe informationalized requirement of the judicial department increasing, the demandof the telephone recording equipment which is used in the jail and prison is alsogrowing fast.At present, the meeting telephone recording equipment can be divided into twocategories that the analog equipment and the digital equipment. And the digitalequipment is taking the place of analog equipment to be the mainstream equipment.But the existing equipment have the same disadvantage that they take the recordingno matter if there is a voice. This topic take the recording only if there is a voice toremove this drawback. Using this method, the size of the voice file can be reduced then therecording system require smaller storage to store the voice file.The automatic recording system of interview phone designed by this topic useARM AM1808embedded CPU as the kernel of the system controller to form themain framework of hardware system, coupled with A/D conversion chip MC145480and Ethernet controller DM9161.This automatic recording system use the embedded Linux operation system as thesoftware operation environment. According to the demands, This automatic recordingsystem configure and tailor the Linux operation system appropriately. At the same time,to meet the functional requirements of the equipment, this topic also designed thecorresponding voice sampling driver, recording and network service application.This topic has realized the voice recording, the voice record management andtransmission, and other functions. This automatic recording system meet the basicrequirements of users and have a strong practical value.