Patent ID: 7984091

Claim:
An interpolator configured to provide a quadratic approximation of a sinusoid, comprising: a sample source for providing first order derivatives of sub-sampled sets of phase factor samples; a flow controller coupled to receive an index input for selecting a harmonic order, and configured to provide signaling responsive in part to the index input; the sample source coupled to the flow controller and configured to provide phase factor information responsive to the signaling; a first differentiator coupled to receive the first order derivatives from the sample source and configured to provide second order derivatives of the first order derivatives; a first scaling device coupled to receive the first order derivatives from the sample source; a second scaling device coupled to receive the second order derivatives from the first differentiator; a first integrator coupled to receive output from the first scaling device and to receive output from the second scaling device; a third scaling device coupled to receive output from the first integrator; and a second integrator coupled to receive output from the third scaling device.