| 摘要 |
PURPOSE:To realize the confirmation of the CM (commercial) broadcast with no crosstalk, by eliminating the low frequency region of both CHs (channels) of the aural signal to confirm the CM broadcast in the multiple TV broadcast and the like, piling the prescribed frequency to secure the inversion of the phases of both CHs and thus increasing enough the CM identification signal in the aural signal. CONSTITUTION:The reproduced signals sent from right and left monaural tape decks 301 and 302 are amplified 311 and 312 each and then recorded on tape decks 341 and 342 via HPF322 and 321 after cutting e.g. 100Hz or less. Then compounding units 441 and 442 are provided between HPF321/322 and amplifiers 331/332, and oscillation frequencies f1, f2 and f3 selected at 100Hz or less and excepting those near the commercial power source frequency are coded through switches 411- 413. Then the phase of the CM identification signal is piled after inversion onto the unit broadcast signal to perform the broadcasting. The CM identification signal is detected out of the received signals, and then the broadcasting of the unit broadcast information is confirmed. Thus the CM identification signal in the aural signals can be increased enough for the TV sound multiple broadcast, realizing the confirmation of the CM broadcast with no crosstalk. |
