Coding device, coding method, decoding device, decoding method, program recording medium and data recording medium

A coding device comprising:

• transform means for converting an input signal to information of a plurality of frequency bands;
• coding means for coding the information of each band from the transform means;
• code string generation means for generating a code string by generating a plurality of partial code strings having auxiliary data and main data generated with respect to codes equivalent to information of each predetermined unit time from the coding means, and rearranging the partial code strings in an order from a partial code string of a highest importance from a leading part of a code string block of each predetermined unit time;
• and
• compression rate change means for changing a compression rate of the code string generated by the code string generation means,
• wherein the code string generation means generates the code string from codes equivalent to minimum necessary information for decoding the code string block equivalent to the information of each predetermined unit time, and arranges the code string at the leading part of the code string block of each predetermined unit time, and
• wherein the compression rate change means generates a code string having a different compression rate than the code string generated by the code string generation means rearranging a plurality of coding units from the leading part of the code string block for each predetermined unit time continuously to a code string equivalent to the minimum necessary information.

A coding method comprising the steps of:

• converting an input signal to information of a plurality of frequency bands;
• coding the information of each band;
• generating a code string by generating a plurality of partial code strings having auxiliary data and main data generated with respect to codes equivalent to information of each predetermined unit time, and rearranging the partial code strings in an order from a partial code string of a highest importance from a leading part of a code string block of each predetermined unit time, and
• changing a compression rate of the generated code string,
• wherein the compression rate of the code string is changed by cutting out a portion of the leading part of the code string block for each predetermined unit time.

A coding method comprising the steps of:

• converting an input signal to information of a plurality of frequency bands;
• coding the information of each band;
• generating a code string by generating a plurality of partial code strings having auxiliary data and main data generated with respect to codes equivalent to information of each predetermined unit time, and rearranging the partial code strings in an order from a partial code string of a highest importance from a leading part of a code string block of each predetermined unit time, and
• changing a compression rate of the generated code string,
• wherein the code string is generated from codes equivalent to minimum necessary information for decoding the code string block equivalent to the information of each predetermined unit time, and is arranged at the leading part of the code string block of each predetermined unit time, and
• wherein the step of changing the compression rate of the generated code string comprises generating a code string having a different compression rate than the code string generated by rearranging a plurality of coding units from the leading part of the code string block for each predetermined unit time continuously to a code string equivalent to the minimum necessary information.

A decoding device for decoding codes generated by coding a signal of each predetermined unit time on a side of a coding device, the decoding device comprising:

• decomposition means for decomposing into the codes a code string having partial code strings arrayed in a predetermined order from a leading part of a code string block of each predetermined unit time, the partial code strings including main data expressing components of the signal and auxiliary data for decoding generated at each of a plurality of frequency bands from the codes on the side of the coding device;
• signal generation means for generating an output signal on a basis of the codes obtained by decomposition by the decomposition means;
• and
• compression rate change means for changing a compression rate of the code string sent from the side of the coding device,
• wherein the compression rate change means changes the compression rate of the code string by cutting to a different length the leading part of the code string block of the code string sent from the side of the coding device for each predetermined unit time.

A decoding method for decoding codes generated by coding a signal of each predetermined unit time on a side of a coding device, the decoding method comprising:

• decomposing into the codes a code string having partial code strings arrayed in a predetermined order from a leading part of a code string block of each predetermined unit time, the partial code strings including main data expressing components of the signal and auxiliary data for decoding generated at each of a plurality of frequency bands from the codes on the side of the coding device;
• generating an output signal on a basis of the codes obtained by decomposition;
• and
• changing a compression rate of the code string sent from the side of the coding device,
• wherein the compression rate of the code string is changed by cutting to a different length the leading part of the code string block of the code string sent from the side of the coding device for each predetermined unit time.

A program recording medium having a coding program recorded therein, the coding program comprising the steps of:

• converting an input signal to a plurality of units of information of each of a plurality of frequency bands;
• coding the information of each band from the transform step;
• generating a code string by generating a plurality of partial code strings having auxiliary data and main data with respect to codes equivalent to information of each predetermined unit time from the coding step and rearranging the partial code strings in an order from a partial code string of a highest importance from a leading part of a code string block of each predetermined unit time;
• and
• changing a compression rate of the generated code string,
• wherein the compression rate of the code string is changed by cutting out a portion of the leading part of the code string block for each predetermined unit time.

A program recording medium having a decoding program recorded therein, the program for decoding codes generated by coding a signal of each predetermined unit time on a side of a coding device, the program comprising the steps of:

• decomposing into the codes a code string having partial code strings arrayed in a predetermined order from a leading part of a code string block of each predetermined unit time, the partial code strings including main data expressing components of the signals and auxiliary data for decoding generated at each of a plurality of frequency bands from the codes on the side of the coding device;
• generating an output signal on a basis of the codes obtained by decomposition of the decomposition step;
• and
• changing a compression rate of the code string sent from the side of the coding device,
• wherein the compression rate of the code string is changed by cutting to a different length the leading part of the code string block of the code string sent from the side of the coding device for each predetermined unit time.

A program recording medium having a coding program recorded therein, the coding program comprising the steps of:

• converting an input signal to a plurality of units of information of each of a plurality of frequency bands;
• coding the information of each band from the transform step;
• generating a code string by generating a plurality of partial code strings having auxiliary data and main data with respect to codes equivalent to information of each predetermined unit time from the coding step and rearranging the partial code strings in an order from a partial code string of a highest importance from a leading part of a code string block of each predetermined unit time;
• and
• changing a compression rate of the generated code string,
• wherein the code string is generated from codes equivalent to minimum necessary information for decoding the code string block equivalent to the information of each predetermined unit time, and is arranged at the leading part of the code string block of each predetermined unit time, and
• wherein the step of changing the compression rate of the generated code string comprises generating a code string having a different compression rate than the code string generated by rearranging a plurality of coding units from the leading part of the code string block for each predetermined unit time continuously to a code string equivalent to the minimum necessary information.