Patent ID: 8565348

Claim:
A radio transmitting apparatus that performs modulation of an input packet signal according to at least two modulation schemes, comprising: a signal routing circuit that routes the input packet signal; a first modulator that performs modulation of the packet signal routed from the signal routing circuit according to a first modulation scheme and outputs a resulting first modulated signal; a second modulator that performs modulation of the packet signal routed from the signal routing circuit according to a second modulation scheme and outputs a resulting second modulated signal; a first initial phase value setting circuit that sets, in the first modulator, an initial value of the phase of the first modulated signal, which is a value at the start of the modulation according to the first modulation scheme; a phase storing circuit that stores the phase of the first modulated signal at the end of the modulation of the packet signal by the first modulator; a second initial phase value setting circuit that sets, in the second modulator, the phase stored in the phase storing circuit as an initial value of the phase of the second modulated signal, which is a value at the start of the modulation according to the second modulation scheme; and a signal gathering circuit that selects and outputs the first modulated signal output from the first modulator and then selects and outputs the second modulated signal output from the second modulator, wherein the first modulation scheme is FSK (frequency shift keying), and wherein the second modulation scheme is DPSK (differential phase shift keying).