Information Hiding for Public Address Audio Signal using FH/FSK Spread-spectrum Scheme

We present a novel application and technology for hiding the messages into the emergency public address audio signals. In the emergent situation such as disaster, the public address siren is very effective way to notify the urgency of disaster to residents and supporting staffs. The people can estimate the direction of the disaster spot or distance from the spot by hearing and seeing the siren car´s moving on the way. However, the people in house or vehicle often cannot hear the notifications. Our study helps them to receive the notifications embedded into the public address siren such a scene. Moreover, the supporting staffs, who work outside, can receive the information about the helps from the siren on the way. To realize our aims, high resistancy of data transmission under outside noisy environment and high acceptance to receive from the moving signal sources are necessary. In this paper, we propose a public address information hiding (PAIH) using FH/FSK spread-spectrum scheme and evaluate its performance with the computer simulations.