WIDEBAND SIGNAL TRANSMISSION SYSTEM

摘要

Described is a transmission system (10) comprising a transmitter (12) for transmitting an input signal to a receiver (14) via a transmission channel (16). The transmitter (12) comprises a splitter (20) for splitting up the input signal into at least first and second frequency band signals. The transmitter (12) further comprises a first encoder (22) for encoding the first frequency band signal into a first encoded frequency band signal and a second encoder (24) for encoding the second frequency band signal into a second encoded frequency band signal. The transmitter (12) is arranged for transmitting the first and second encoded frequency band signals via the transmission channel (16) to the receiver (14). The receiver (14) comprises a first decoder (26) for decoding the first encoded frequency band signal into a first decoded frequency band signal and a second decoder (28) for decoding the second encoded frequency band signal into a second decoded frequency band signal. The receiver (14) further comprises a combiner (30) for combining the first and second decoded frequency band signals into an output signal and reconstruction means (48) for reconstructing the second decoded frequency band signal when the second decoded frequency band signal is not available. The transmission system (10) is characterized in that the reconstruction means (48) are arranged for reconstructing the second decoded frequency band signal from the first decoded frequency band signal. In this way, errors occurring in the receipt or decoding of the second frequency band signal can be concealed by reconstructing the missing part(s) on the basis of the first frequency band signal which was received and decoded correctly. Preferably, this reconstruction is done by means of bandwidth extension.