| 摘要 |
An FM transmitter improved in degree of freedom of selecting components. The FM transmitter comprises an oscillator 72 connected to a crystal oscillator 70, a clock generating circuit 50 for generating a clock signal having a frequency which is an integral multiple of the frequency of the output signal from the oscillator 72 by using the output signal as a reference frequency signal fr1, a DSP 20 operable synchronously with the clock signal and adapted for conducting digital stereo modulation, digital FM modulation, and digital IQ modulation of inputted stereo data, a frequency synthesizer 60 for generating a signal having a frequency which is an integral multiple of the frequency of the output signal from the oscillator 72 by using the output signal as a reference frequency signal fr2, mixers 40, 42 for mixing the signals outputted from the DSP 20 with the signal generated by the frequency synthesizer 60, an adder 44 for adding the outputs from the mixers 40, 42, and amplifier 46 for amplifying the output signal from the adder 44 to transmit it from an antenna 48.
|
