Digital sampling frequency converter

A calculation unit able to supply a shift signal to set of shift registers of a converter converting an input digital signal into an output digital signal and comprising:

• a first storage unit able to contain a value of a conversion ratio or of its inverse, so that the stored value is between 0 and 1,
• a second storage unit able to contain, at a cycle time i+1, i being an integer, a future signal equal to a sum of a current signal contained in the second unit at a cycle time i and of the content of the first storage unit, the shift signal resulting from an exclusive OR function between a most significant bit of the current signal and a most significant bit of the future signal.

A method of converting an input digital signal into an output digital signal, said method comprising the calculation step able to supply a shift to a set of shift registers, itself comprising the substeps of:

• storage of a value of a conversion ratio or of its inverse, so that the value stored is between 0 and 1,
• addition or subtraction of the value of the value previously stored to or from a current signal initially equal to an initialization signal, resulting from a future signal,
• exclusive OR between a most significant bit of the current signal and a most significant bit of the future signal.