The output device generates the PN code string every second chip interval with reference to the video sync signal, and spectrally spreads the additional information using this PN code string. This process is particularly suitable for the production of analgesic gas mixtures that can be used in the medical field, particularly a mixture formed from 50% oxygen and 50% nitrous oxide. A size of the fracture and detailed shape is then computed consistent with the computed orientation using a stochastic optimization procedure.