Encoding device, encoding method, and program

An encoding method of an encoding device, comprising

• a first high-frequency encoding unit which calculates a high-frequency code amount being a code amount of a high-frequency code string for obtaining a high-frequency component based on a low-frequency component and the high-frequency component of an input signal;
• a low-frequency encoding unit which encodes the low-frequency component of the input signal to generate a low-frequency code string;
• a low-frequency decoding unit which decodes the low-frequency code string;
• a second high-frequency encoding unit which generates the high-frequency code string based on a decoded low-frequency component obtained by decoding the low-frequency code string and the high-frequency component such that the code amount of the high-frequency code string is not larger than the high-frequency code amount;
• and
• a multiplexing unit which multiplexes the low-frequency code string and the high-frequency code string to generate an output code string,
• the encoding method comprising the steps of:
• calculating the high-frequency code amount by the first high-frequency encoding unit;
• encoding the low-frequency component by the low-frequency encoding unit;
• decoding the low-frequency code string by the low-frequency decoding unit;
• generating the high-frequency code string by the second high-frequency encoding unit;
• and
• generating the output code string by the multiplexing unit.

A program which allows a computer to execute a process comprising the steps of:

• calculating a high-frequency code amount being a code amount of a high-frequency code string for obtaining a high-frequency component based on a low-frequency component and the high-frequency component of an input signal;
• encoding the low-frequency component of the input signal to generate a low-frequency code string;
• decoding the low-frequency code string;
• generating the high-frequency code string based on a decoded low-frequency component obtained by decoding the low-frequency code string and the high-frequency component such that the code amount of the high-frequency code string is not larger than the high-frequency code amount;
• and
• multiplexing the low-frequency code string and the high-frequency code string to generate an output code string.