US 2001/0044713 A1Published application

Digital sub-band transmission system with transmission of an additional signal

AssigneeKoninklijke Philips Electronics N.V.

InventorsGerardus C.P. Lokhoff, Yves-Francois Dehery, Gunther Josef Stoll

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Abstract

Reproduction accuracy of a digital signal, representing for example stereo audio signals, is improved by transmitting sample data which have been encoded to form transmission signals. The transmission signals are arranged in consecutive frames, each frame including a plurality of information packets, and each information packet including N bits. The number of information packets in a frame is determined by the ratio of the product of the transmission bit-rate and the number of samples represented in the frame, to the product of the number of bits in a packet and the sampling frequency. The transmission signals are recorded in a record carrier, or are transmitted in real time. In a digital stereo audio signal embodiment, the samples may be sub-band encoded or transform encoded. The transmission signal may include an indicator signal indicating a combination of certain samples, or scale factor signals for specific components of the sampled signal.

Claims29

Dependent claims

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.

7 more elements

A transmitter 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, 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.

2 more elements

A receiver for receiving a wide-band digital audio signal comprising at least a first and a second audio signal component from a transmission medium, the receiver comprising:

receiving means for receiving a composite transmission signal comprising data-reduced sub signals;
data expansion means for data expanding the received data-reduced sub-signals to form replicas of the sub-signals;
and
a decoder having synthesis filter means for combining sub-signals for each of the at least two audio signal components to form a replica of the at least first and second audio signal components, characterized in that the composite transmission signal further includes at least a first auxiliary digital signal component, the 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 the third frame portions in the frames of the composite transmission signal received.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/908,932Filed 19 Jul 2001
Priority: NL 89014022 Jun 1989
Published: 22 Nov 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

H04B 1/667
For reducing bandwidth of signals; for improving efficiency of transmission: using a division in frequency subbands
G10L 19/0204
Using spectral analysis, e.g. transform vocoders or subband vocoders: using subband decomposition
G11B 20/00007
Signal processing not specific to the method of recording or reproducing; Circuits therefor: time or data compression or expansion
G11B 20/10
Signal processing not specific to the method of recording or reproducing; Circuits therefor: digital recording or reproducing

Family

Application09/521,052Division · filed 8 Mar 2000
Application09/908,932Division · filed 19 Jul 2001
US 6,289,308 B1Related patent
US 6,691,086 B2Related patent
US 2001/0044713 A1This patent

From the US filing history. Foreign family members aren’t listed.