| 摘要 |
A signal filter attachment for use with a sound circuit having a sound signal device, and first and second ear phones each having first and second speakers and a wire harness and having a circuit housing , a socket on the housing; a pin plug for connecting the attachment to the sound signal device, and in which the housing has a first pair of filter coils , and wires connecting the first pair of filter coils on opposite sides of the first speaker in the first earphone ,a second pair of filter coils and wires connecting the second pair of filter coils on opposite sides of the second speaker in the second ear phone , and in which the first and second pairs of filter coils are each bifilar wound wire coils the wires of respective coils being wound adjacent to one another side by side on a common core; and, a wire harness connecting the first and second pair of filter coils to the pin plug. |
