| 摘要 |
A passive noise reduction device (100) for use with an instrument (138) having one or more strings, the instrument (138) including at least one electromagnetic pickup (140, 142, 144) including at least one coil (162), the pickup (140, 142, 144) responsive to vibration of at least one string so as to produce a music electrical signal component in the pickup coil (162) and responsive to one or more stimuli in addition to the string vibration so as to produce a noise electrical signal component in the pickup coil (162). The device (100), including a device coil (102) wound so as to form at least one free-shaped ring, a first terminal (106) for connection to the pickup coil (162), a second terminal (108) for connection to ground, the device coil responsive to the one or more stimuli so as to produce a noise electrical signal component in the device coil (102), wherein the pickup coil and the device coil are in substantially the same plane, wherein the noise reduction device coil (102) is wound such that the pickup noise electrical signal component is substantially 180° out of phase with respect to the device noise electrical signal component, and such that the device noise electrical signal component destructively interferes with the pickup noise electrical signal component so as to reduce noise in a resultant electrical signal into the output circuit. |
