A method for the melting of pig iron in a blast furnace operated with oxygen or in a melt-reduction plant, with a reduction region. The communication system receives data samples that are either sampled at a narrowband rate or a wideband rate and provides various functions and services, such as echo cancellation, DTMF detection and generation, and call discrimination. Thus, commercially available storage containers, differing considerably in their dimensions, can be directly fitted onto the gun housing in a short time and by a reliable method. The integrator is configured to receive and integrate the instantaneous frequency samples to generate a sequence of phase samples.