Patent ID: 6691086
Filing Date: 2004-02-10
Classification: G10L,G11B,H04B,H04H

Abstract:
A digital transmission system having a transmitter and a receiver, for transmitting a wide-band digital audio signal, comprising at least two signal components including a first and a second audio signal component, via a transmission medium, the transmitter comprising:an encoder having analysis filter means for filtering the signal components to form a number n of sub-signals for each of the at least two signal components; data reducing means for data reducing the n sub-signals of each of the at least two signal components; and transmission means for transmitting the data-reduced sub-signals via the transmission medium, and the receiver comprising: receiving means for receiving the data-reduced sub-signal; data expansion means for data expanding the received data-reduced sub-signals to form non-data-reduced replicas of the sub-signals; and a decoder having synthesis filter means for combining sub-signals for each of the at least two signal components to form replicas of the at least first and second signal components, characterized in that the transmitter is further adapted to transmit at least a first auxiliary digital signal component, the transmitter further comprising: means for generating a composite transmission signal comprising frames, a frame including a first frame portion comprising synchronization information, a second frame portion comprising a block of data of the data reduced sub signals, and a third frame portion located after the second frame portion in said frame, said third frame portion comprising a block of data of the auxiliary digital signal, and the receiver further comprising: derivation means for deriving said at least one auxiliary digital signal component from third frame portions in frames of the composite transmission signal received.