DE69944788C5 - Verlustfreie kodierung/dekodierung in einem übertragungssystem - Google Patents

Description

• Betreffend das europäische Patent 0 993 733 ( DE 699 44 788 ) hat der 6. Senat (Nichtigkeitssenat) des Bundespatentgerichts auf Grund der mündlichen Verhandlung vom 15. Januar 2021 für Recht erkannt:
1. I. Auf die Klage wird das Europäische Patent 0 993 733 mit Wirkung für das Hoheitsgebiet der Bundesrepublik Deutschland teilweise für nichtig erklärt, soweit es über folgende Fassung hinausgeht:
   1. 1. A transmitting device for lossless transmitting a digital audio information signal via a transmission medium, comprising:
      • - a lossy encoder (6) adapted to compress the digital audio information signal to a lossy encoded signal, the lossy encoder (6) being configured as a filter bank encoder performing subband encoding or transform encoding,
      • - a lossy decoder (12) adapted to expand the lossy encoded signal so as to obtain a replica of the digital audio information signal, the lossy decoder (12) being configured as a filter bank decoder performing subband decoding or transform decoding,
      • - a first signal combination unit (16) adapted to combine the digital audio information signal and the replica to a first residue signal,
      • - a lossless encoder (26) adapted to compress the first residue signal to a lossless encoded residue signal,
      • - a second signal combination unit (30) adapted to combine the lossy encoded signal and the lossless encoded residue signal to a transmission signal for the transmission via the transmission medium, characterized in that the lossless encoder comprises
        • - a prediction filter (38) for deriving a prediction signal from the first residue signal,
        • - a signal combination unit (42) for combining the prediction signal and the first residue signal so as to obtain a second residue signal,
        • - an entropy encoder (44) for encoding the second residue signal to the lossless encoded residue signal.
   2. 2. A transmitting device as claimed in Claim 1, characterized in that the entropy encoder (44) takes the form of a Huffman encoder.
   3. 3. A transmitting device as claimed in Claim 1, characterized in that the prediction filter (38) is an adaptive filter, which calculates coefficients for which the energy content of the second residue signal is minimal.
   4. 4. A device for recording a transmission signal on a record carrier, said device comprising a transmitting device according to any of claims 1 to 3, and means for recording the transmission signal on the record carrier.
   5. 5. A device as claimed in Claim 4, characterized in that the transmitting device includes an error correction encoding unit (502) and/or a channel encoding unit (504).
   6. 6. A receiving device for lossless receiving a transmission signal which contains a lossy encoded signal and a lossless encoded residue signal, wherein the lossy encoded signal is encoded by a lossy encoder configured as a filter bank encoder performing subband encoding or transform encoding, the receiving device comprising:
      • - receiving means (60) for receiving the transmission signal from the transmission medium,
      • - demultiplexing means (62) for extracting the lossy encoded signal and the lossless encoded residue signal from the transmission signal,
      • - a lossy decoder (70) adapted to expand the lossy encoded signal to a replica of a digital audio information signal, the lossy decoder (12) being configured as a filter bank decoder performing subband decoding or transform decoding,
      • - a lossless decoder (78) adapted to expand the lossless encoded residue signal to a first residue signal,
      • - a signal combination unit (82) adapted to combine the replica of the digital audio information signal and the first residue signal to the digital audio information signal, characterized in that the lossless decoder comprises
      • - an entropy decoder (92) for decoding the lossless encoded residue signal into a second residue signal,
      • - a signal combination unit (94) for combining the second residue signal and a prediction signal to the first residue signal,
      • - a prediction filter (96) for processing the second residue signal so as to form the prediction signal.
   7. 7. A receiving device as claimed in Claim 6, characterized in that the entropy decoder (92) takes the form of a Huffman decoder.
   8. 8. A device for reproducing a transmission signal recorded on a record carrier, said device comprising a receiving device according to any claims 6 to 7, and means for reproducing the transmission signal recorded on the record carrier.
   9. 9. A device as claimed in Claim 8, characterized in that the device includes a channel decoding unit (606) and/or an error correction unit (608).
   10. 10. A method of lossless transmitting a digital audio information signal via a transmission medium, comprising the steps of:
       • - receiving the digital audio information signal,
       • - compressing the digital audio information signal in a lossy fashion so as to form a lossy encoded signal, the digital audio information signal being compressed in a lossy encoder configured as a filter bank encoder performing subband encoding or transform encoding,
       • - expanding the lossy encoded signal to a replica of the digital audio information signal in a lossy decoder (12) configured as a filter bank decoder performing subband decoding or transform decoding,
       • - combining the digital audio information signal and the replica of the digital audio information signal to a first residue signal,
       • - compressing the first residue signal in a lossless fashion so as to form a lossless encoded residue signal,
       • - combining the lossy encoded signal and the lossless encoded residue signal to a transmission signal for the transmission via the transmission medium, characterized in that the lossless compression comprises the following steps:
       • - deriving a prediction signal from the first residue signal,
       • - combining the prediction signal and the first residue signal so as to obtain a second residue signal,
       • - encoding the second residue signal to the lossless encoded residue signal.
   11. 11. A method of transmitting a digital audio information signal via a transmission medium, as claimed in Claim 10, characterized in that the prediction signal is derived from the first residue signal.
   12. 12. A method as claimed in Claim 10 or 11, in which the transmission signal is stored on a record carrier.
   13. 13. A record carrier carrying a transmission signal obtainable by means of a method as claimed in Claim 10 or a transmitting device as claimed in Claim 1, wherein the transmission signal has been obtained by combining a lossy encoded signal and a lossless encoded residue signal, the lossy encoded signal being obtained by compressing a digital audio information signal in a lossy fashion so as to form a lossy encoded signal, the digital audio information signal being compressed in a lossy encoder configured as a filter bank encoder performing subband encoding or transform encoding, the lossless encoded residue signal being obtained by encoding a second residue signal, the second residue signal being obtained by combining a prediction signal and a first residue signal, the prediction signal being derived from the first residue signal, the first residue signal being obtained by combining the digital audio information signal and the replica of the digital audio information signal, and the replica of the digital audio information signal being obtained by expanding the lossy encoded signal in a lossy decoder (12) configured as a filter bank decoder performing subband decoding or transform decoding.
   14. 14. An apparatus including a device for recording a transmission signal on a record carrier as claimed in Claim 4 and a device for reproducing the transmission signal recorded on the record carrier as claimed in Claim 8.