Patent ID: 8165871

Claim:
A method of encoding a sinusoidal signal, the method comprising: performing sinusoidal tracking for an audio signal, which comprises a first sinusoidal signal whose magnitude is less than a masking value, according to a psychoacoustic model in order to determine a second sinusoidal signal from among sinusoidal signals of a previous frame preceding a current frame which comprises the first sinusoidal signal, and a third sinusoidal signal from among sinusoidal signals of a next frame following the current frame, wherein the second sinusoidal signal and the third sinusoidal signal are connected to the first sinusoidal signal; encoding the first sinusoidal signal using a particular code indicating that a magnitude of the first sinusoidal signal is less than the masking value according to the psychoacoustic model; and encoding the third sinusoidal signal by performing difference coding for the third sinusoidal signal using only the second sinusoidal signal or both the first sinusoidal signal and the second sinusoidal signal.