Parcor coefficient quantization method, parcor coefficient quantization apparatus, program and recording medium

A PARCOR coefficient quantization method, comprising:

• a PARCOR coefficient quantization step of quantizing a PARCOR coefficient,
• wherein it is assumed that the PARCOR coefficient is represented by an R-bit value, U represents a predetermined integer equal to or greater than 1 and smaller than {R−(2U−1)}, and V represents a predetermined integer equal to or greater than 0 and smaller than {R−(2U−1)−U}, and
• the PARCOR coefficient quantization step comprises:
• (a) a step of determining a bit sequence that represents an absolute value L of the PARCOR coefficient K;
• (b) a step of acquiring U bits beginning with the most significant bit from the bit sequence that represents the absolute value L of the PARCOR coefficient K;
• and
• (c) a step of acquiring (U+V+W) bits beginning with the most significant bit from the bit sequence that represents the absolute value L of the PARCOR coefficient K, where W represents a value of the U bits acquired in the step (b).

A PARCOR coefficient quantization method, comprising:

• a PARCOR coefficient quantization step of quantizing a PARCOR coefficient,
• wherein the PARCOR coefficient quantization step comprises:
• (a) a step of determining a bit sequence that represents an absolute value L of the PARCOR coefficient K;
• (b) a step of acquiring a bit sequence having a predetermined length beginning with the most significant bit from the bit sequence that represents the absolute value L;
• and
• (c) a step of acquiring a bit sequence corresponding to a value T from a look-up table, the value T being a value of the bit sequence acquired in the step (b), and the look-up table allocating a bit sequence including more effective bits from the most significant bit toward the least significant bit to a larger value T.

A PARCOR coefficient quantization apparatus, comprising:

• a PARCOR coefficient quantization part that quantizes a PARCOR coefficient,
• wherein it is assumed that the PARCOR coefficient is represented by an R-bit value, U represents a predetermined integer equal to or greater than 1 and smaller than {R−(2U−1)}, and V represents a predetermined integer equal to or greater than 0 and smaller than {R−(2U−1)−U}, and
• the PARCOR coefficient quantization part comprises:
• a first processing part that determines a bit sequence that represents an absolute value L of the PARCOR coefficient K;
• a second processing part that acquires U bits beginning with the most significant bit from the bit sequence that represents the absolute value L of the PARCOR coefficient K;
• and
• a third processing part that acquires (U+V+W) bits beginning with the most significant bit from the bit sequence that represents the absolute value L of the PARCOR coefficient K, where W represents a value of the U bits acquired by the second processing part.

A PARCOR coefficient quantization apparatus, comprising:

• a PARCOR coefficient quantization part that quantizes a PARCOR coefficient,
• wherein the PARCOR coefficient quantization part comprises:
• a first processing part that determines a bit sequence that represents an absolute value L of the PARCOR coefficient K;
• a second processing part that acquires a bit sequence having a predetermined length beginning with the most significant bit from the bit sequence that represents the absolute value L;
• and
• a third processing part that acquires a bit sequence corresponding to a value T from a look-up table, the value T being a value of the bit sequence acquired by the second processing part, and the look-up table allocating a bit sequence including more effective bits from the most significant bit toward the least significant bit to a larger value T.