초록 ▼

An active silencer provided in a pipe which has one end reaching the noise source and the other end open, the active silencer being provided with a sound generating means which is provided at the sidewall of the pipe facing inside the pipe, a sound collecting means which is provided outside the pipe

An active silencer provided in a pipe which has one end reaching the noise source and the other end open, the active silencer being provided with a sound generating means which is provided at the sidewall of the pipe facing inside the pipe, a sound collecting means which is provided outside the pipe close to the other end and which detects noise dissipated from the pipe opening, a phase leading means which outputs a lead phase output signal which is advanced from the phase of an output signal of the sound collecting means by a phase corresponding to a predetermined time determined by the distance between the sound generating means and the sound collecting means; and a drive means which outputs a signal constituting the lead phase output signla inverted in phase as a drive signal for the sound generating means, the predetermined time tt

대표청구항 ▼

An active silencer provided at a pipe which has one end reaching a noise source and another end open, said active silencer comprising: means for generating a sound into said pipe so that a noise passing through said pipe from said noise source is reduced; means for collecting the sound dissipated fr

An active silencer provided at a pipe which has one end reaching a noise source and another end open, said active silencer comprising: means for generating a sound into said pipe so that a noise passing through said pipe from said noise source is reduced; means for collecting the sound dissipated from the open end of the pipe, said sound collecting means being provided outside the pipe close to said another open end and away from said sound generating means;