Lossless audio coding/decoding apparatus and method

A lossless coding method comprising:

• directly coding first symbols;
• converting the first symbols into second symbols and coding the second symbols;
• comparing a result of the coding of the first symbols and a result of the coding of the second symbols and determining a coding mode in accordance with a comparison result;
• and
• generating a final bitstream by coding the first symbols in correspondence with the coding mode.

A lossless decoding apparatus comprising:

• a selection mode analyzation unit to analyze an input selection mode and dividing and to provide a bitstream in accordance with a result of the analyzing;
• a first decoder to restore first symbols by directly decoding the bitstream provided by the selection mode analyzation unit in correspondence with the selection mode;
• a second decoder module including a plurality of second decoders to perform code inverse conversion and symbol inverse conversion and to decode the bitstream provided by the selection mode analyzation unit in correspondence with a region mode included in the selection mode by using second decoders corresponding to identification modes included in the selection mode;
• and
• a combiner to restore the first symbols by combining a result of the decoding of the first decoder and a result of the decoding of the second decoders in correspondence with the selection mode.

A lossless decoding method comprising:

• analyzing an input selection mode and dividing and providing a bitstream to a first decoder and a plurality of second decoders performing code inverse conversion and symbol inverse conversion in accordance with an analysis result;
• restoring first symbols by directly decoding the bitstream provided to the first decoder in correspondence with the selection mode;
• decoding the bitstream provided to the second decoders in correspondence with a region mode included in the selection mode by using second decoders corresponding to identification modes included in the selection mode;
• and
• restoring the first symbols by combining a decoding result of the first decoder and a decoding result of the second decoders in correspondence with the selection mode.