| 摘要 |
PURPOSE:To receive a TV sound signal and an FM sound signal by transmitting an output of amplifiers having different frequency bands to a common IF amplifier and low-frequency amplifier via a diode respectively and outputting the output as a sound from a speaker. CONSTITUTION:When a frequency changeover switch 9 is selected to the position (a), an FM receiving signal is amplified 2, frequency-converted into an IF signal and its output is extracted by an IF transformer 3. Further, a received signal is outputted as a sound from the speaker 7 via the diode 16 and a capacitor 4 through the IF amplifier circuit 5 and the low-frequency amplifier circuit 6 so as to turn on the diode 16. On the other hand, when the switch 9 is selected to the position (b), the TV sound signal is amplified 12, frequency-converted into the IF signal and outputted from an IF transformer 13. Further, a diode 17 is turned on, and the receiving signal is outputted as a sound from the speaker 7 through the diode 17, the capacitor 4, and the circuits 5 and 6. |
