| 摘要 |
PURPOSE:To prevent the deterioration of degree of separation at the stage of demodulation, by bisecting an introduction line of an FM signal of two-voice carrier system, and connecting a mutual modulation circuit, a filter, and a frequency discriminator to one of them so that one of stereo signals can be outputted. CONSTITUTION:An introduction line l1 for a carrier signal (F1+ or -DELTAF( (L+R)))+ (F2+ or -DELTAF(R)) frequency-modulated for two-voice carrier system, is bisected. Further, on one line l2, an intermodulation circuit U1 mentioned later, the 1st band pass filter BPF1 taking the frequency of the ternary component signal (2F1-F2) as the center frequency, and the 1st audio frequency discriminator U2 are connected, to output one stereo signal L. To another line l3, the 2nd band pass filter BPF2 taking the 2nd carrier F2 as the center frequency and the 2nd voice frequency discriminator U3, are connected to output another stereo signal R. The intermodulation circuit U1 consists of the constitution as shown in Figure, for example, to produce the frequency components of an odd order consisting of the combination of input side signals f1, f2, as f1, f2, 2f1-f2, 2f2-f1, 3f1-2f2,-. |
