Patent ID: 8605222

Claim:
A receiver device, comprising: a first frequency converter for frequency-converting an analog input signal to a first frequency; an analog-to-digital converter for converting an analog signal obtained by the frequency conversion to the first frequency to a first digital signal which is a digital signal having the first frequency; a second frequency converter for frequency-converting the first digital signal to a second frequency differing from the first frequency to output a digital signal as a second digital signal; a digital-to-analog converter for converting one of the first and second digital signals to an analog signal for external output; and a switching circuit for switching between a first mode in which the first digital signal is supplied to the digital-to-analog converter and a second mode in which the second digital signal is supplied to the digital-to-analog converter, the switching circuit including, a wire connected at an end thereof to an input of the second frequency converter, and a switch for connecting an input of the digital-to-analog converter to one of another end of the wire and an output of the second frequency converter, the switch being configured to connect the input of the digital-to-analog converter to the another end of the wire in the first mode and connect the input of the digital-to-analog converter to the output of the second frequency converter in the second mode, wherein the second frequency converter is a computation/conversion circuit for carrying out a trigonometric function-based computation on the first digital signal to frequency-convert the first digital signal to the second frequency, and the switching circuit is a computation content control circuit for controlling content of the computation in the computation/conversion circuit according to frequency conversion information output to the computation/conversion circuit.