Parameter selection method, parameter selection apparatus, program, and recording medium

A parameter selection method of selecting parameters for variable length coding of prediction residuals of time-series signals in a certain discrete time segment, comprising:

• (A) a step of designating a positive second-segment parameter that corresponds to a monotonically non-decreasing function value of an average amplitude of prediction residuals in a time segment including a second segment as a parameter for variable length coding of prediction residuals in the second segment, a first segment being an earliest time segment included in the discrete time segment, and the second segment being a time segment subsequent to the first segment;
• and
• (B) a step of designating a value that corresponds to a monotonically non-decreasing function value of a sum of the second-segment parameter and a positive additional value that corresponds to an index representing prediction effectiveness of a long-term prediction analysis of time-series signals in the discrete time segment as a parameter for variable length coding of a prediction residual at a certain discrete time in the first segment.

An apparatus that selects parameters for variable length coding of prediction residuals of time-series signals in a certain discrete time segment, comprising:

• a second-segment parameter calculator that designates a positive second-segment parameter that corresponds to a monotonically non-decreasing function value of an average amplitude of prediction residuals in a time segment including a second segment as a parameter for variable length coding of prediction residuals in the second segment, a first segment being an earliest time segment included in the discrete time segment, and the second segment being a time segment subsequent to the first segment;
• and
• a first-segment parameter calculator that designates a value that corresponds to a monotonically non-decreasing function value of a sum of the second-segment parameter and a positive additional value that corresponds to an index representing prediction effectiveness of time-series signals in the time segment including the second segment as a parameter for variable length coding of a prediction residual at a certain discrete time in the first segment.

An apparatus that selects parameters for variable length coding of prediction residuals of time-series signals in a certain discrete time segment, comprising:

• a second-segment parameter calculator that designates a positive second-segment parameter that corresponds to a monotonically non-decreasing function value of an average amplitude of prediction residuals in a time segment including a second segment as a parameter for variable length coding of prediction residuals in the second segment, a first segment being an earliest time segment included in the discrete time segment, and the second segment being a time segment subsequent to the first segment;
• and
• a first-segment parameter calculator that designates a value that corresponds to a monotonically non-decreasing function value of a sum of the second-segment parameter and a positive additional value that corresponds to an index representing prediction effectiveness of a long-term prediction analysis of time-series signals in the discrete time segment as a parameter for variable length coding of a prediction residual at a certain discrete time in the first segment.