Method and apparatus for sinusoidal audio coding and method and apparatus for sinusoidal audio decoding

An apparatus for sinusoidal audio coding, the apparatus comprising:

• a sinusoidal analysis unit that extracts sinusoids of a current frame from an input signal;
• a sinusoid tracking unit that tracks and codes a continuation mode sinusoid of the current frame by using a sinusoid of a previous frame which continues to the continuation mode sinusoid;
• a birth mode amplitude coding unit that searches for a sinusoid having a closest frequency to a frequency of a birth mode sinusoid of the current frame, and calculates and codes a difference between an amplitude of the sinusoid having the closest frequency and an amplitude of the birth mode sinusoid;
• and
• a birth mode frequency coding unit that codes the frequency of the birth mode sinusoid,
• wherein the birth mode sinusoid is generated in the current frame but not continued from the previous frame.

A method of sinusoidal audio decoding, the method comprising:

• decoding a continuation mode sinusoid from among coded sinusoids of a current frame;
• decoding a frequency of a birth mode sinusoid of the current frame;
• searching for a sinusoid having a closest frequency to the decoded frequency;
• decoding a coded amplitude difference of the birth mode sinusoid;
• and
• calculating an amplitude of the birth mode sinusoid by adding the amplitude of the sinusoid having the closest frequency to the decoded amplitude difference,
• wherein the continuation mode sinusoid is a sinusoid that continues from a previous frame, and the birth mode sinusoid is a sinusoid that is generated in the current frame but not continued from the previous frame.

An apparatus for sinusoidal audio decoding, the apparatus comprising:

• a continuation mode sinusoid decoding unit that decodes a continuation mode sinusoid from among coded sinusoids of a current frame;
• a birth mode frequency decoding unit that decodes a frequency of a birth mode sinusoid of the current frame;
• and
• a birth mode amplitude decoding unit that searches for a sinusoid having a closest frequency to the decoded frequency, decodes a coded amplitude difference of the birth mode sinusoid, and calculates an amplitude of the birth mode sinusoid by adding the amplitude of the sinusoid having the closest frequency to the decoded amplitude difference,
• wherein the continuation mode sinusoid is a sinusoid that continues from a previous frame, and the birth mode sinusoid is a sinusoid that is generated in the current frame but not continued from the previous frame.

A computer readable recording medium having recorded thereon a computer program for executing a method of sinusoidal audio decoding, the method comprising:

• decoding a continuation mode sinusoid from among coded sinusoids of a current frame;
• decoding a frequency of a birth mode sinusoid of the current frame;
• searching for a sinusoid having a closest frequency to the decoded frequency;
• decoding a coded amplitude difference of the birth mode sinusoid;
• and
• calculating an amplitude of the birth mode sinusoid by adding the amplitude of the sinusoid having the closest frequency to the decoded amplitude difference,
• wherein the continuation mode sinusoid is a sinusoid that continues from a previous frame, and the birth mode sinusoid is a sinusoid that is generated in the current frame but not continued from the previous frame.