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Local area audio signal transmission system uses analog channels for voice transmission. They are constructed with one main voice transmitter and many receivers. Transmitter can also make individual communication with the receiver without additional complex switching box. Communication is established using only two lines of I2C protocol. The system developed here uses digital voice transmission upon I2C network. This system has many advantages: enhance the voice quality of broadcasting, encrypts the voice data for secret communication and reduce the overall system cost for construction and maintenance. Any receiving Node can be added or removed from this I2C bus easily; therefore a cost effective network of communication with security/monitoring functions for buildings, plants or communities can be built.