Generalised running DHT and real-time (DHT) analysers

Introduces generalised running discrete Hartley transforms (DHT) and recursive DHT real-time analysers. Four types (I-IV) are described. They are defined and used as bases for updating both the discrete Hartley and Fourier transforms sample by sample. The z-transforms solutions of running DHTs are used to design the recursive real-time DHT analysers. These serve as efficient foundations for sub-band filters, spectrum analysis, convolution and fast computation of various forms of discrete Fourier transforms. An exemplary architecture is given. The analysis of the designed prefilters using the four types of DHTs is covered