Method for increasing a quality of sampled receive signals (s E) with a signal processing device, wherein the signal processing device has a controller, a receive signal generator for generating receive signals (s E) with an upper receive signal cut-off frequency f E,G, a sampling signal generator for generating sampling signals (s A), a mixer and a low-pass filter with a low-pass cut-off frequency f T,G characterized in that a set I ⊂ N and a plurality of sampling signal repetition rates f A,W,i with a running variable i for all i ∈ I are generated by the controller, that a receive signal repetition rate associated with each of the sampling signal repetition rates f A,W,i is determined by the controller with a factor c = f E,G /(f E,G - f T,G) either according to f E,W,i ≈ c · f A,W,i or according to f E,W,i ≈ 1/c · f A,W,i with f E,W,i ≠ f A,W,i, wherein the steps - generating a receive signal sequence (s E,F,i) consisting of the receive signals (s E) in that the receive signal generator is triggered with the receive signal repetition rate f E,W,i by the controller, - generating a sampling signal sequence (s A,F,i) consisting of the sampling signals (s A) in that the sampling signal generator is triggered with the sampling signal repetition rate f A,W,i by the controller, - generating a mixed signal sequence (s M,i) in that the receive signal sequence (s E,F,i) and the sampling signal sequence (s A,F,i) are mixed with one another by the mixer, - low-pass filtering the mixed signal sequence (s M,i) by the low-pass filter, and - determining a quality indicator (Q i) of the low-pass filtered mixed signal sequence (s F,i) by the controller, are executed for all i ∈ I and that a quality indicator (Q i) which exceeds a predetermined quality threshold is then selected by the controller from the determined quality indicators, and the sampling signal repetition rate f A,W,i and the receive signal repetition rate f E,W,i associated therewith are subsequently used. wherein the signal processing device has a controller, a receive signal generator for generating receive signals (s E) with an upper receive signal cut-off frequency f E,G, a sampling signal generator for generating sampling signals (s A), a mixer and a low-pass filter with a low-pass cut-off frequency f T,G characterized in that a set I ⊂ N and a plurality of sampling signal repetition rates f A,W,i with a running variable i for all i ∈ I are generated by the controller, that a receive signal repetition rate associated with each of the sampling signal repetition rates f A,W,i is determined by the controller with a factor c = f E,G /(f E,G - f T,G) either according to f E,W,i ≈ c · f A,W,i or according to f E,W,i ≈ 1/c · f A,W,i with f E,W,i ≠ f A,W,i, wherein the steps - generating a receive signal sequence (s E,F,i) consisting of the receive signals (s E) in that the receive signal generator is triggered with the receive signal repetition rate f E,W,i by the controller, - generating a sampling signal sequence (s A,F,i) consisting of the sampling signals (s A) in that the sampling signal generator is triggered with the sampling signal repetition rate f A,W,i by the controller, - generating a mixed signal sequence (s M,i) in that the receive signal sequence (s E,F,i) and the sampling signal sequence (s A,F,i) are mixed with one another by the mixer, - low-pass filtering the mixed signal sequence (s M,i) by the low-pass filter, and - determining a quality indicator (Q i) of the low-pass filtered mixed signal sequence (s F,i) by the controller, - generating a receive signal sequence (s E,F,i) consisting of the receive signals (s E) in that the receive signal generator is triggered with the receive signal repetition rate f E,W,i by the controller, - generating a sampling signal sequence (s A,F,i) consisting of the sampling signals (s A) in that the sampling signal generator is triggered with the sampling signal repetition rate f A,W,i by the controller, - generating a mixed signal sequence (s M,i) in that the receive signal sequence (s E,F,i) and the sampling signal sequence (s A,F,i) are mixed with one another by the mixer, - low-pass filtering the mixed signal sequence (s M,i) by the low-pass filter, and - determining a quality indicator (Q i) of the low-pass filtered mixed signal sequence (s F,i) by the controller, are executed for all i ∈ I and that a quality indicator (Q i) which exceeds a predetermined quality threshold is then selected by the controller from the determined quality indicators, and the sampling signal repetition rate f A,W,i and the receive signal repetition rate f E,W,i associated therewith are subsequently used.