| 摘要 |
PURPOSE:To simplify a circuit for a ringing tone and a confirming sound by using an oscillated signal from a reference frequency oscillator or a PLL circuit to generate the ringing tone and the confirming tone. CONSTITUTION:When a call button 22 is depressed, a wireless talking device is switched into the transmission state and an oscillation signal from a reference frequency oscillator 13 is inputted to a ringing tone generating circuit 20. The circuit 20 applies frequency division of 1/N2 to the said oscillation signal and inputs the result to a modulation circuit 9, the frequency division signal and a sound signal inputted to the circuit 9 through an amplifier circuit 8 from a microphone are mxied and the mixed signal is transmitted from an antenna 11 in a frequency of a desired opposite party. The oscillated signal from the oscillator 13 is inputted also to a confirming sound generating circuit 21 at the same time, the signal is subject to 1/N3 frequency division by the circuit 21 and after a button 22 is depressed, the confirming sound is fed to a speaker 7 for a prescribed time thereafter. Thus, the circuit constitution is simplified by using the oscillated signal from the oscillator 13 for the circuits 20 and 21. |
