Sampling frequency converter

A sampling frequency converter for converting a first signal sampled at a first sampling frequency f1 into a second signal sampled at a second sampling frequency f2, said second sampling frequency f2 being equal to L/M times said first sampling frequency f1, where L and M are natural numbers satisfying L.noteq.M, said sampling frequency converter comprising:

• an interpolation device supplied with said first signal as an input signal thereof, for inserting L-1 zeros for every sampling time;
• a filter circuit supplied with an output signal of said interpolation device as an input signal thereof, for attenuating a frequency component over a frequency f/2 within an output signal of said interpolation device, where f is a frequency, said filter circuit comprising a series circuit which includes a finite impulse response digital filter and an infinite impulse response digital filter which is coupled in series to an output stage of said finite impulse response digital filter, said frequency f being equal to said first sampling frequency f1 under a condition f1<f2 and being equal to said second sampling frequency f.sub.2 under a condition f1>f2;
• and
• a decimation device supplied with an output signal of said filter circuit as an input signal thereof, for extracting sampled values in the output signal of said filter circuit at a rate of one sampled value for every M sampled values in the output signal of said filter circuit, to produce said second signal.