Patent ID: 7378996

Claim:
A sampling rate conversion calculating apparatus which converts two or more digital signal sequences which have different sampling frequencies into the same sampling frequency, comprising: a first digital signal processing section for increasing a sampling frequency of the first digital signal sequence by multiplying the sampling frequency of the first digital signal sequence by an integer; a second digital signal processing section for multiplying a sampling frequency of the second digital signal sequence by a rational number which varies; an adder section for adding the digital signal sequence outputted from the first digital signal processing section and the digital signal sequence outputted from the second digital signal processing section; and an output terminal for outputting a digital signal sequence into which the adder section adds the digital signal sequences, wherein the first digital signal processing section determines the integer by which the sampling frequency of the first digital signal sequence is multiplied for increasing the sampling frequency of the first digital signal sequence in order to adjust the sampling frequency of the first digital signal sequence to the sampling frequency of the output terminal, and the second digital signal processing section determines a rational number, by which the sampling frequency of the second digital signal sequence is multiplied in order to adjust the sampling frequency of the second digital signal sequence to the sampling frequency of the output terminal.