Data processing system, recording/reproducing device, data processing method and file management method

A recorder/reproducer for recording and reproducing a digital video and audio coded signal of a predetermined format onto and from a recording medium, the digital video and audio coded signal including a direct current component of each small block of a frame, class information defining a method of quantizing each small block and motion information on motion of each small block from a previous frame located in a fixed position in a recording packet, the digital recording/reproducer comprising:

• means of setting (1) a part of an area to which a codeword of a small block is assigned, which part is behind an end-of-block code, (2) an area where the class information is recorded and (3) an area where the motion information is recorded as a general-purpose data recording area, and means of assigning input data to the general-purpose data recording area.

A converting method for converting input data into a format of a digital video and audio coded signal having units of a predetermined transmission packet, where a direct current component of each small block constituting a frame is present in a fixed position in the transmission packet, the method comprising the steps of:

• adding an end-of-block code in an area where a codeword of each of the small blocks is disposed, setting a part of the area of the codeword of the small block, which is behind the end-of-block code as a general-purpose data disposition area, and disposing the data is in the general-purpose data disposition area.

A converting method for converting input data into a format of a digital video and audio coded signal having units of a predetermined transmission packet, where a direct current component of each small block constituting a frame, class information and motion information are present in a fixed position in the transmission packet, the method comprising the steps of:

• setting (1) a part of an area where a codeword of each small block is disposed, which part is behind an end-of-block code, (2) an area where class information is recorded and (3) an area where motion information is recorded are set a general-purpose data disposition area, and disposing the data in the general-purpose data disposition area.

A converting method using as an input signal a digital video and audio coded signal having a format where a codeword of a direct current component of each small block of a frame is present in a fixed position in a transmission packet, the method comprising the steps of:

• setting a part of an area, where the codeword of each small block of the input signal is disposed, which part is behind an end-of-block code, as a general-purpose data area, and outputting data from the general-purpose data area as converted data.

A converting method using as an input signal a digital video and audio coded signal having a format where a codeword of a direct current component of each small block of a frame, class information and motion information are present in a fixed position in a transmission packet, the method comprising the steps of:

• setting (1) a part of an area where the codeword of each small block of the input signal is disposed, which part is behind an end-of-block code, (2) an area where the class information is recorded and (3) an area where the motion information is recorded as a general-purpose data area, and outputting data from the general-purpose data area as converted data.

A recorder/reproducer for recording and reproducing a digital video and audio coded signal of a predetermined format in units of a predetermined recording packet,

• in which a codeword of a direct current component of each small block of a frame is located in a fixed position in the recording packet, the recorder/reproducer comprising:
• means of adding an end-of-block code in an area to which the codeword of each small block in a predetermined track is assigned, means of setting a part of the area to which the codeword of the small block is assigned, which part is behind the end-of-block code, as a file management information recording area, and means of assigning file management information, which is information on files recorded in a recording medium is to the file management information recording area.

A recorder/reproducer for recording and reproducing a digital video and audio coded signal of a predetermined format in units of a predetermined recording packet,

• in which a direct current component of each small block of a frame, class information and motion information are present in a fixed position in the recording packet, the recorder/reproducer comprising:
• means of setting (1) a part of an area to which a codeword of each small block is assigned, which part is behind an end-of-block code, (2) an area where the class information is recorded and (3) an area where the motion information is recorded as a file management information recording area, and means of assigning file management information to the file management information recording area.

A converting method for converting input data into a format of a digital video and audio coded signal having units of a predetermined transmission packet, where a direct current component of each small block of a frame is present in a fixed position in the transmission packet, the method comprising the steps of:

• adding an end-of-block code in an area where a codeword of each small block is disposed, setting a part of the area where the codeword of the small block is disposed, which is behind the end-of-block code, as a file management information area, and performing conversion on the data disposed in the file management information area.

A converting method for converting input data into a format of a digital video and audio coded signal having units of a predetermined transmission packet, where a direct current component of each small block of a frame, class information and motion information are present in a fixed position in the transmission packet, the method comprising the steps of:

• setting (1) a part of an area where a codeword of each small block is disposed, which part is behind the end-of-block code, (2) an area where the class information is recorded and (3) an area where the motion information is recorded as a file management information area, and performing conversion on the data disposed in the file management information area.