Signal coding properties of asynchronous delta modulator

Various asynchronous delta modulation algorithms are considered. The statistical distribution of interbit intervals is analyzed and the signal-to-noise ratio behaviour is compared vis-a-vis linear and adaptive delta modulation algorithms. The problem of transmission of nonuniform samples through synchronous channels has also been treated. Quantization and runlength encoding characteristics of interbit intervals are studied. The optimal size and the statistical properties of buffer memory are determined and trade-offs between various system parameters such as runlength constraint, overflow and underflow probabilities and synchronization words are investigated.