| 摘要 |
PURPOSE:To improve economical efficiency by allowing one display device to perform stereophonic broadcast display of FM and that of television. CONSTITUTION:A light emitting diode is used as a stereophonic broadcast display device 38, and the stereophonic broadcast display driving output of an FM stereophonic demodulation part 5 and that of a sound multiplex demodulation part 11 of television are ORed to drive the stereophonic broadcast display device 38 by the OR output. Namely, during FM broadcast reception, a positive DC voltage appears at the output stage of a phase comparator 21 by a pilot signal of 19kHz and this DC voltage turns on the diode 35 as the display device 38. During sound multiplex signal reception, the positive DC voltage is obtained at the output stage of a phase comparator 33 and a diode turns on to emit light from the display device 38. |
