Sample rate converter using polynomial interpolation
AssigneeKoninklijke Philips Electronics N.V.
InventorBruno J. G. Putzeys
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Abstract
A sample rate converter for converting the sampling frequency of an input signal from a first frequency to a second frequency. Such a sample rate converter uses interpolator and a phase-locked loop receiving the first and the second sampling frequency. The interpolator is implemented as a polynomial interpolator.
Claims6
A sample rate converter for converting the sampling frequency of an input signal from a first sampling frequency to a second sampling frequency, said sample rate converter comprising:
- input means for receiving the input signal with the first sampling frequency;
- output means for supplying an output signal with the second sampling frequency;
- converting means for converting the input signal into the output signal, said converting means comprising interpolation means;
- and
- a phase-locked loop for receiving the first and second sampling frequencies, and for controlling the converting means, characterized in that the interpolation means comprises polynomial interpolation means using the formula:
- Y ( x ) = ∑ i = 0 6 x i ∑ j = 0 m + n a i , j y ( j - m ) ;
- wherein Y(x)=the output signal, and y(j−m)=an input signal sample.
A method for converting the sampling frequency of an input signal from a first sampling frequency to a second sampling frequency, said method comprising the steps of:
- receiving the input signal with the first sampling frequency;
- and
- converting the input signal into an output signal with the second sampling frequency using interpolation, wherein the converting step is controlled by a signal depending on the difference between the first and second sampling frequencies, characterized in that the interpolation used in the converting step is polynomial interpolation using the formula:
- Y ( x ) = ∑ i = 0 6 x i ∑ j = 0 m + n a i , j y ( j - m ) ;
- wherein Y(x)=the output signal, and y(j-m)=an input signal sample.
Dependencies are inferred from the claim text.