A study on the realtionships between stochastic and harmonic coding

Two of the coding methods which have appeared recently, attempting to solve the problem of high quality speech coding at bit rates below 9.6 kbits/sec are harmonic and stochastic coding. The two represent distinct approaches to this problem and yield synthetic speech of a very different kind. In this paper, we discuss the advantages and disadvantages of both methods for processing voiced and unvoiced speech segments, and examine the potential benefits of combining the two methods in coding applications.