LOW FREQUENCY DIGITAL RECEIVER

Application of digital devices removes many experimental obstacles, as the physical elements are replaced by their virtual computer analogs. A receiver is realized in an ordinary computer supplied by the ADC (analog-digital converter) board and by the appropriate soft. Such a device appears to be much cheaper than an analog one, since the computers and ADC boards are universal pieces of equipment manufactured in great series, and there is a substantial competition in the market. Tuning and adjustments of a digital receiver is simpler than those of an ordinary one and is made much faster: it is reduced to simple editing of the program listing and its re-compilation. However, one must be able to write the programs in the languages of high level and to know the update techniques of signal processing. In the present study, we provide optimal solutions for digital receivers. As an example, we present the organization of a real VLF/LF receiver. Appendix contains the listings of typical program blocks in the C/C++ and Assembler languages.