| 摘要 |
PURPOSE:To enable to confirm the channel selection operation with sound, by frequency-dividing the oscillation signal of the oscillation circuit for reference and by obtaining the reproduced sound through the supply of frequency dividing signal to the low frequency part related to this operation. CONSTITUTION:The frequency division signal Sd from the frequency division circuit 42 is fed to the frequency division circuit 61 performing 1/4 frequency division and divided into the signal Sa. When either of the switches Su, Sd, S1- S8 is ON, since the output of the AND circuit 76 is zero, the multi-vibrator 77 is triggered to form the pulse Pm and it is fed to the AND circuit 74. Further, during the period of Pm=''1'', since the signal Sa is fed to the amplifier 32 through the AND circuit 74 and OR circuit 75, the sound of signal Sa is reproduced from the speaker 33 for a short time and the operation of the switch can be confirmed with this reproduction sound. |
