Acoustic Camera System

Abstract:

This project aims to build a sound controlled camera system, in which a camera placed in a room changes its focusing area according to the sound generated by an intruder. The images captured by the camera are stored in a PC for instant or future analysis. The system consists of an PIR sensor which will detect an intruder, who trespasses in to the room. The microphones placed in the different corners or points in the room will detect the sound generated by the intruder. According to the distance to the microphones from the intruder varies the intensity of the sound captured by microphones also varies. Thus by comparing the sound intensities we can identify the position of the intruder. Then the stepper motors driven by the controller will adjust the angle of camera to focus the intruder.

There is a set of IR sensors (IR LEDs and receivers) also there, which are placed in the doors and windows of the room. Whenever the optical radiations from the IR LEDs breaks, that any one enters the room, it will be detected by the sensor and the camera will be focused to that position.

The usage of both microphones and IR sensors make the system capable to identify intruders who come with and without sound, also those who come through direct and indirect paths. The GSM transceiver connected through the MAX 232 is used for communication to the authority to inform the presence of intruder.