Sinusoidal coding and Multi-Band Excitation (MBE) vocoders are very promising coding schemes, but require large computational complexity for generating the large number of sinusoids. This paper presents a synthesizer based on pitch period interpolation. As a result, it significantly reduces the computational requirement, in real time implementation. The computational load for a typical IMBE vocoder is reduced from 30% to 12% of the available DSP32C capacity. Since the pitch synchronized method mimics natural speech production, it produces better quality than the conventional sample by sample interpolation method.

Keywords: Speech Coding, Speech Synthesizing