| 摘要 |
PURPOSE:To simplify a circuit constitution by making a power amplifier perform a mixing operation without providing a mixing circuit in the cross talk negative circuit. CONSTITUTION:The input signals of the input terminals L, R are applied to the power amplifiers L, R, respectively through the coupling condencer C1, and the output signals of the amplifiers L, R are made to branch and are applied to the negative signal generting circuits A (L) and A (R) through the switches S (R) and S (L). The left and right circuits A (L) and A (R) constituted as mentioned above are formed by a filter circuit by a resistor R3 and capacitors C4, C5, and a delay circuit by transistors TR (L), (R) and resistors R4-R8, in order that the gain in the loop can be decided by the sum of the output impedance of this delay circuit and the resistor R9 and the ratio of its output impedance to the resistor R2. And an output signal and a cross talk negative signal which is different frequency characteristic, delay time and signal level are made up, and a space cross talk is offset in audiofeeling by applying this negative signal to the input terminal - of opposite phase of the opposite side amplifiers L, R, respectively. |
