| 摘要 |
PURPOSE:To prevent folding even in case of <1 conversion rate by using an N-fold conversion rate of a desired conversion rate and thinning it to the desired 1/N conversion rate after the output passes a low-pass filter. CONSTITUTION:In case of conversion from an input sample train x(n) of a sampling frequency fs to a sampling frequency pfs (p<1), conversion is performed with an N-fold conversion rate Np of a conversion rate P in an interpolating processing 1. The output is allowed to pass a digital low-pass filter 2 having a sampling frequency Npfs to limit the output to a p-fold signal band pfc of an original signal band fc. This output is thinned in a sample thinning circuit 3 to 1/N to obtain a sampling rate conversion result of the conversion rate (p). |
