| 摘要 |
<p>PURPOSE: To combinedly use a frequency generation circuit of a modulated wave, etc., in the both systems when the circuit where the transmission of an analog signal and the transmission of a digital signal are combined is composed in a transmission circuit such as a portable telephone set. CONSTITUTION: By the control of a transmission control means 21, the modulations in modulation means 6I and 6Q of the digital data that a digital data generation means 5 outputs and the FM modulation by the mixture of analog signals in a mixing means 35 are selectively performed, and the transmission of digital data and the transmission of the analog signals can be selectively performed. By the control of a transmission control means 21, the constant of a loop filter 34 is changed when the digital data is modulated in the modulation means 6I and 6Q, and when the FM modulation is performed by mixing the analog signals in the mixing means 35.</p> |
