Patent ID: 8725519

Claim:
An audio encoding method comprising: detecting at least one sinusoidal wave from an input audio signal; deriving additional basis vectors of the at least one detected sinusoidal wave using a number of to-be-derived basis vectors, a frequency variation determined according to the number of the to-be-derived basis vectors and at least one of de-quantized frequencies and de-quantized phases; obtaining components of additional basis vectors by using residual audio signals and the derived additional basis vectors of the sinusoidal wave; obtaining an encoding efficiency of each of the detected sinusoidal waves based on the components of the additional basis vectors, de-quantized amplitudes, and a predetermined number of the derived additional basis vectors; determining whether or not to transmit the components of the additional basis vectors by comparing the encoding efficiency with a predetermined reference value; and encoding at least one of (a) frequencies of the sinusoidal waves and (b) phases and amplitudes of the sinusoidal waves, and the derived additional basis vectors when the transmission of the components of the additional basis vectors is determined; wherein the residual audio signals are obtained by excluding the detected sinusoidal waves from the input audio signal.