An Efficient Time Domain Speech Compression Algorithm Based on LPC and Sub-Band Coding Techniques

Speech compression is a mature technology with many applications. Over the past decade, huge advances have been made in the area of speech coding for reduced bit-rate transmission. With perceptual audio coding, the signal is coded efficiently using a psychoacoustic model, as in MPEG standards. In this paper, two well known algorithms, LPC (Linear Predictive Coding) and subband coding are combined to reduce data transmission rate from 128 Kbps to as low as 12 Kbps at minimum complexity and implemented on a digital signal processor. The performance of the proposed algorithm is almost same as the MPEG algorithm without its complexity.