In this paper, a novel approach for system design and hardware realization of wireless chaotic digital speech communication via digital signal processor (DSP) is proposed. According to Runge-Kutta algorithm and variable ratio expansion transformation, taking multi-scroll generalized Jerk as an example, the continuous chaotic system is converted to the discrete chaotic one so as to generate chaotic digital sequences, which are used for speech data encryption and decryption. Based on the DSP technical platform with TMS320VC5509APGE chip, by utilizing nRF2401 wireless transmitter and receiver, wireless chaotic digital speech communication is successfully implemented. The results of technical design and hardware realization are also given, which confirms the feasibility of the scheme.