Abstract:

The current Bluetooth technology is high-power, not suitable for multiuser laboratory research and development applications. The system uses the STM32 processors Speex speech coding and decoding algorithm technology to achieve infrared wireless communication in a short distance via voice transmission module, relaying node module and receiver module enhances the function of the voice device. Test results show that the output noise voltage of the receiving device is smaller than 0.1 V, the relaying station can change the transmission direction in any degrees, the speech signal safe, stable transmission range up to 8 m.

Key words: infrared communication, Speex algorithm, relaying transmit