Automatic telephone answering machineA thesis submitted in partial fulfilment of the requirement forthe degree of Bachelor of technology In Electronics &communication byPuspita Priyadarsini Nayak(0901335047),Bhagyashree Nayak(0901335037),Pragyan Pranati Mishra(0901335039),Satabdi Mansingh(0901335043) &Subhan Pratim Jena(0901335051) Under the guidance of Prof Satyasen Panda Department ofElectronics and communication Engineering Synergy Institute ofTechnology, BBSR.
Automatic telephone answering machineA thesis submitted in partial fulfilment of the requirement forthe degree of Bachelor of technology In Electronics &communication byPuspitaPriyadarsiniNayak(0901335047),Bhagyashree Nayak(0901335037),Pragyan Pranati Mishra(0901335039),Satabdi Mansingh(0901335043) &Subhan Pratima Jena(0901335051)Under the guidance of Prof Satyasen Panda Department ofElectronics and communication Engineering Synergy Institute ofTechnology,BBSR
CERTIFICATEThis is to certify that the thesis entitled “Automatic TelephoneAnswering Machine” submitted by PUSPITA P.NAYAK,PRAGYAN P. MISHRA,SATABDIMANSINGH,BHAGYASHREE NAYAK AND SUBHAN P. JENA Finalyear student of Electronics & Communication Engineering, inpartial fulfilment of the requirements for the award of B.Techdegree at SYNERGY INSTITUTE OF TECHNOLOGY,BBSR abonafide work carried out by them under my supervision andguidance. To the best of my knowledge, the matter embodiedin the thesis has not been submitted to any otheruniversity/institute for the award of any degree or diploma.(Prof. Satyasen panda) Project Guide ECE Dept. Synergy Institute ofTechnology ,bbsr ACKNOWLEDGEMENT
We would like to articulate our and profound gratitude indebtedness tothose persons who helped us in completion of the project. The mostpleasant point of pre-sending a thesis is the opportunity to thank thosewho contributed to it. First and foremost, we would like to convey ourobligation to our project guide Prof satyasen panda for his constantmotivation, valuable suggestions and timely inspirations throughout theproject duration. We are sincerely thankful to him for his esteemedguidance and pain taking effort in improving our understanding on thetopic.We truly appreciate all our faculty members for providing a solidbackground for our studies and research thereafter which helped a lot toproperly shape the problem and provided insights towards the solution.They have been great sources of inspiration to us and we thank them fromthe bottom of our heart always encouraged and helped us in thesuccessful completion of our thesis work.Date-22.12.2012 Puspita P.NayakSit,bbsr Satabdi Mansingh Pragyan P. Mishra Bhagyashree Nayak Subhan pratima Jena
ABSTRACTAn automatic telephone answering machine or system is an electronicdevice that answers automatically to an incoming telephone call and plays apre recorded message and is capable of recording a message the caller wantto leave. These systems include message recording system having remoteaccess to message playback, automatic dialing, equipment to receive analarm, automatic data entry-answering systems and other commontelephone devices being used along with modem equipments. Themicrocontroller typically controls a number of peripherals, components ofthe answering machine such as an LCD or LED display, an indicator lightfor recording and playback options, a DTMF receiver and an audiocontroller. A telephone answering machine must be capable of beingremotely activated consisting of: A switch deciding the mode of operation either automatic or normalmode. Provis ion for receiving the calls automatically when in automatic mode. Provis for recording the message to be delivered to the incoming user ionand also to record his message Storage for the message Micro controller to deliver control signal as per the mode of operationCommonly used telephone answering devices comprises of a number offeatures which allow a user to examine the presence of a call, seize calls,play back recorded voice messages, record an announcement etc.Triggering of a telephone answering machine done by counting theincoming ring signals and when the count surpass a preset number set bythe user. The machine is programmed in such a way that if the user does notattain his telephone within a specified time period which is the function ofnumber of ring signals, the call is automatically answered and a message isplayed back to the caller as well as asks him to leave a message.