DAB micro-transmitters for insertion of local windows

By incorporating micro-transmitters into a given DAB-SFN (digital audio broadcasting-single frequency network), service providers are able to replace the information content of a specified single channel inside the predefined ensemble so that it is of local interest. There must be no interference with neighbouring channels, which must still be receivable within the small radiation field (e.g. 300 m/sup 2/) of the micro-transmitter without loss of information content. The consequent, technical problems are analysed and discussed and measurements are reported which were derived from an experiment setup to demonstrate the operating principle. Conclusions and outlook are given.