Asynchronous sampling frequency conversion device, method, and computer program product

An asynchronous sampling frequency conversion method comprising:

• storing input digital signals in a storage unit;
• specifying first data and second data based on a ratio of a sampling frequency of the input digital signal to a sampling frequency of an output digital signal, the first data being sampled at a sampling timing immediately before an ith (where i is a natural number) sampling timing of the output digital signal among the input digital signals stored in the storage unit, the second data being sampled at the sampling timing immediately after the ith sampling timing of the output digital signal;
• and
• calculating a value of ith data of the output digital signal based on the specified first data, the specified second data and the ratio.

A computer program product comprising a non-transitory computer usable medium having computer readable program codes embodied in the medium causing a computer to execute:

• storing input digital signals in a storage unit;
• specifying first data and second data based on a ratio of a sampling frequency of the input digital signal to a sampling frequency of an output digital signal, the first data being sampled at a sampling timing immediately before an ith (where i is a natural number) sampling timing of the output digital signal among the input digital signals stored in the storage unit, the second data being sampled at the sampling timing immediately after the ith sampling timing of the output digital signal;
• and
• calculating a value of ith data of the output digital signal based on the specified first data, the specified second data and the ratio.