Two-point frequency modulation apparatus, wireless transmitting apparatus, and wireless receiving apparatus

Abstract

A two-point frequency modulation apparatus is provided that reduces input timing difference and improves modulation accuracy. Two-point frequency modulation apparatus 10 has: PLL circuit 11; frequency division ratio generator 13 that generates the frequency division ratio in frequency divider 111 based on first digital baseband signal S1 and carrier signal; adder 114 that adds second digital baseband signal S2 to the output signal of loop filter 113; a delay index calculator (filter coefficient calculator 17) that calculates the delay index based on the magnitude of change in the amplitude of the output signal of adder 114; and a delay adjuster (digital filter 18) that shifts the phase of one of first digital baseband signal S1 and second digital baseband signal S2 according to the delay index so as to reduce the phase difference.

Dependencies are inferred from the claim text.