Device for calculating a charge for a charged information signal with errors avoided in a report of the charge

摘要

An amount of money which should be charged on reception of a pay television signal or a like charged information signal, is calculated by a charging device comprising a calculator (25) for calculating an amount of charge as the amount of money and an encoder (28) for encoding the charge and time instants by a key code specific to the charging device into a check code which should be reported together with the charge. The time instants may be indicated either by a timepiece (26) or by a time signal multiplexed on the information signal. Cost information used in the calculator may be multiplexed on the information signal. Alternatively and preferably, the cost information is represented by a scrambling key used in providing the information signal.