| 摘要 |
<p>PURPOSE:To prevent the occurrence of phase delay of the signal for negative feedback by transmitting the signal for negative feedback from the speaker system to a speaker driving circuit through the conductor on the inner side of a cable wherein the section of the conductors is of concentrical circle form. CONSTITUTION:A speaker system 2 and a system driving amplifier 1 are coupled by means of a triple coaxial cable 3 wherein the section of conductors is of concentrical circle form, the innermost conductor being used for the negative feedback signal from the system 2, the inside conductor for hot and the outermost conductor for grounding. As a result, the negative feedback signal is shielded from the outside and if the mesh wire or the like being the shield wire of the negative feedback signal conductor is connected to the conductor on the hot side, then the potential of the mesh wire for shielding of the conductor for hot becomes higher than that of the innermost conductor and the occurrence of the phase delay of the negative feedback by the interconductor capacity is prevented. Hence the speaker system is stably driven.</p> |
