Signal processing method, encoding apparatus using the signal processing method, decoding apparatus using the signal processing method, and information storage medium

A non-transitory information storage medium having recorded therein a bitstream comprising:

• synchronization information;
• bitstream information comprising additional bitstream information;
• at least one audio block comprising a skip field and at least one audio signal;
• and
• an auxiliary data field comprising auxiliary data bits,
• wherein at least one of the additional bitstream information, the skip field, and the auxiliary data bits comprises additional information for executing, by a decoding apparatus, at least one of audio channel number expansion and three-dimensional (3D) reproduction of the at least one audio signal,
• wherein at least one of the additional bitstream information, the skip field, and the auxiliary data bits comprises first information which is information associated with extraction of the additional information, and
• wherein the additional information comprises 3D information of the at least one audio signal.

An encoding apparatus comprising:

• an encoder which encodes at least one audio signal according to a predetermined standard;
• a formatter which formats the encoded at least one audio signal into a bitstream comprising synchronization information, bitstream information, at least one audio block, and an auxiliary data field;
• and
• a control unit which inserts additional information into at least one of additional bitstream information included in the bitstream information, a skip field included in the at least one audio block, and auxiliary data bits included in the auxiliary data field, and which inserts first information, which is information associated with extraction of the additional information, into at least one of the additional bitstream information, the skip field, and the auxiliary data bits,
• wherein the additional information comprises 3D information of the at least one audio signal.

A decoding apparatus comprising:

• a deformatter which deformats a bitstream comprising synchronization information, bitstream information, at least one audio block including at least one audio signal, and an auxiliary data field;
• a control unit which extracts first information, which is information associated with extraction of additional information and included in at least one of additional bitstream information included in the bitstream information, a skip field included in the at least one audio block, and auxiliary data bits included in the auxiliary data field, and which extracts the additional information from at least one of the additional bitstream information, the skip field, and the auxiliary data bits by using the extracted first information;
• and
• a decoder which decodes the extracted additional information,
• wherein the additional information comprises 3D information of the at least one audio signal.

A method of processing a bitstream, the method comprising:

• generating additional information;
• encoding at least one audio signal according to a predetermined standard;
• formatting the encoded at least one audio signal to the bitstream, the bitstream comprising bitstream information, at least one audio block, and an auxiliary data field;
• inserting the additional information into at least one of additional bitstream information included in bitstream information, a skip field included in the at least one audio block, and auxiliary data bits included in the auxiliary data field;
• and
• inserting first information into at least one of the additional bitstream information, the skip field, and the auxiliary data bits,
• wherein the first information is information used to extract the additional information from the bitstream, and
• wherein the additional information comprises 3D information of the at least one audio signal.

A method for processing a bitstream comprising synchronization information, bitstream information, at least one audio block including at least one audio signal, and an auxiliary data field, the method comprising:

• receiving the bitstream in which at least one of additional bitstream information included in the bitstream information, a skip field included in the at least one audio block, and auxiliary data bits included in the auxiliary data field comprises additional information;
• extracting first information which is information associated with extraction of the additional information, and is included in at least one of the additional bitstream information, the skip field, and the auxiliary data bits;
• and
• extracting and decoding the additional information by using the extracted first information,
• wherein the additional information comprises at least one of reconstruction information of multi-channels for expanding an audio channel number to more than a number of channels included in the bitstream, and three-dimensional (3D) information of the at least one audio signal, and
• wherein the method further comprises:
• generating, by an encoding apparatus, the additional information;
• encoding, by the encoding apparatus, the at least one audio signal according to a predetermined standard;
• formatting, by the encoding apparatus, the encoded at least one audio signal to the bitstream;
• inserting, by the encoding apparatus, the additional information into the at least one of the additional bitstream information, the skip field, and the auxiliary data bits;
• and
• inserting, by the encoding apparatus, the first information into the at least one of the additional bitstream information, the skip field, and the auxiliary data bits.

A method for processing a bitstream comprising synchronization information, bitstream information, at least one audio block including at least one audio signal, and an auxiliary data field, the method comprising:

• receiving the bitstream in which at least one of additional bitstream information included in the bitstream information, a skip field included in the at least one audio block, and auxiliary data bits included in the auxiliary data field comprises additional information;
• extracting first information which is information associated with extraction of the additional information, and is included in at least one of the additional bitstream information, the skip field, and the auxiliary data bits;
• and
• extracting and decoding the additional information by using the extracted first information, and
• wherein the additional information comprises reconstruction information of multi-channels for expanding an audio channel number included in the bitstream to more than a number of channels permitted by a predetermined standard.