Fecha de publicación: 18/08/2010 Fuente: Wipo "digitalization" An apparatus for providing a combined digital signal comprises a bit adder and a combiner. The combined digital signal contains information of a first digital input signal and a second digital input signal, wherein a block length of the first digital input signal is shorter than a block length of the second digital input signal. The bit adder is configured to add at least one filling bit to a block of the first digital input signal to obtain an adapted first digital input signal, so that the block length of the adapted first digital input signal is equal to a block length of the second digital input signal. The combiner is configured to combine the adapted first digital input signal and the second digital input signal to obtain and provide the combined digital signal.