Voice recording control system development

Specially at service sector because of competition between companies, companies needs newrequirements for better service quality. Communicating with telephone becomesindispensable in human life with increasing of tecnology, for effective use of telephone,people should experience with their faults and should share their experience with each other,for this case registering conversations economically is very important.At this project, the purpose is recording four telephone lines on a magnetic casette at sametime by using a modulation circuit. Records are starting manually or automatically when oneof the telephone is hanged up. A user interface is created for useful control. User interfacecontains one LCD and keypad.Principles and hardware structure is presented at this projectKeywords:Microcontroller, Analog Filter, Voice Record, Magnetic Record Field, PSTNTelephone Line1