Patent ID: 8224659

Claim:
An audio encoding method comprising: extracting sinusoids of a current frame by performing sinusoidal analysis of an input audio signal; obtaining a birth sinusoid, which is not connected to a sinusoid of a previous frame, a continuation sinusoid, which is connected to the sinusoid of the previous frame and a sinusoid of a subsequent frame, and a death sinusoid, which is connected to the sinusoid of the previous frame and which is not connected to the sinusoid of the subsequent frame, by performing sinusoid tracking of the extracted sinusoids of the current frame; performing absolute coding of an amplitude of the birth sinusoid; performing Huffman coding of a difference between an amplitude of the continuation sinusoid and an amplitude of the sinusoid of the previous frame to which the continuation sinusoid is connected, using a first Huffman table that is based on a characteristic of the continuation sinusoid; and performing Huffman coding of a difference between an amplitude of the death sinusoid and the amplitude of the sinusoid of the previous frame to which the death sinusoid is connected, using a second Huffman table different from the first Huffman table that is based on a decreasing; characteristic of an amplitude of the death sinusoid, wherein the second Huffman table is optimized to encode the death sinusoid based on the decreasing characteristic of the amplitude of the death sinusoid.