US 5,530,655 AGranted

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

AssigneeU.S. Philips Corporation

InventorsGerardus C. P. Lokhoff, Yves-Francois Dehery, Gerhard J. Stoll

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Abstract

A transmission channel may be utilized for a combination of wide-band signals and auxiliary signals, while still providing improved reproduction accuracy. Digital sub-signals or subband signals representing at least first and second data-reduced components are combined with at least one auxiliary digital signal in defined frame portions before transmission. The auxiliary signal may be user-discernible information such as third and fourth audio channels, so that a four channel surround sound signal is transmitted; or teletext or video or picture information may be provided. Sampling reduction and filtering into subbands may be applied to the auxiliary signal as well as to the first and second signal components.

Claims28

Dependent claims

A digital transmission system, for transmitting a digital signal comprising a plurality of information signal components including at least a first component, a second component and a first auxiliary component, over a transmission medium from a transmitter to a receiver, wherein

said transmitter comprises:
an encoder including analysis means for altering and data-reducing said first component and second component to obtain a number n of sub-signals for each of said first component and second component,
means for combining said number n of sub-signals for each of said first component and said second component and a signal corresponding to said first auxiliary component to form said digital signal, and
transmission means for transmitting said digital signal via the transmission medium, and
said receiver comprises:
receiving means for receiving said digital signal,
derivation means for deriving said number n of sub-signals for each of said first component and said second component and said signal corresponding to said first auxiliary component from the received digital signal, and
a decoder for obtaining respective replicas of the information signal components, said decoder including synthesis means for expanding and combining said sub-signals for said first component and for expanding and combining said sub-signals for said second component.

5 more elements

A digital transmission system, for transmitting a digital signal comprising a plurality of information signal components including at least a first wide-band audio component, a second wide-band audio component and a first auxiliary component, over a transmission medium from a transmitter to a receiver, wherein

said transmitter comprises:
an encoder including analysis means for filtering and data reducing said first and second components to obtain subband signals in a number n of subbands for each of said first component and second component,
means for combining said subband signals and a signal corresponding to said first auxiliary component to form said digital signal, and
transmission means for transmitting said digital signal via the transmission medium, and
said receiver comprises:
receiving means for receiving said digital signal,
derivation means for deriving said subband signals and said signal corresponding to said first auxiliary component from the received digital signal, and
a decoder for obtaining respective replicas of the information signal components, said decoder including synthesis means for expanding and combining the subband signals for said first component and expanding and combining the subband signals for said second component.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/483,009Filed 6 Jun 1995 · continuation
Priority: NL 89014022 Jun 1989
Granted: 25 Jun 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification33 codes

H04H 20/88
Arrangements characterised by the broadcast information itself: stereophonic broadcast systems
G10L 19/008
Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals,…:…
G10L 19/0208
Using subband decomposition: subband vocoders
G11B 20/00007
Signal processing not specific to the method of recording or reproducing; Circuits therefor: time or data compression or expansion

Family

Serial532,462Parent of this continuation · filed 1 Jun 1990
Serial997,158Parent of this continuation · filed 21 Dec 1992
Serial173,850Parent of this continuation · filed 27 Dec 1993
Serial190,807Parent of this continuation · filed 1 Feb 1994
US 5,323,396 AParent of this continuation · filed 21 Jun 1994
US 5,530,655 AThis patent

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