Application of A7121 in Wireless Transmission System of Digital Audio

Aiming at the deficiency of the most short-range wireless transferring systems with bad sound quality and high cost, this paper proposed a design to realize a high-fidelity wireless audio digital transferring system by using the cheaper chips, such as A7121, WM8725, ATmega48, etc. Then we expatiated the detail of the system's architecture, the hardware connection and software design in the paper. The experimental results show that this resolution has lower cost, better sound quality and powerful anti-jamming. The concrete performance parameters of the system are up to the total harmonic distortion ratio of 0.1%, the frequency response range of 20 Hz- 20 kHz, the signal-to-noise ratio (SNR) of 95 dB, the effective transmitting distance of 100 m and the perfect CD sound quality.