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Acoustic cloaking for the suppression of backscattering inside ducts isproposed in the audible range where plane waves are curved around the objectusing the surface modes of the liner. It is numerically shown that a slowlyvarying resonant liner (e. g. based on an array of tubes) creates a zone ofsilence in which an object of arbitrary shape can be acoustically hidden for awide range of frequencies. And then, a resonant liner has deflecting propertieswithout reflection of the wavefront, which are close to an ideal invisibilitycloak. This kind of cloaking is effective in a wide frequency band and thecloaking band is a function of the impedance and height of the obstaclerelative to the conduit. For smooth shaped obstacles, there is an ability ofthe object to help hide itself, which increases the cloaking frequency band(self-cloaking). Dispersion effects lead to slow sounds and distortion of thewave phase.

Using liner surface modes in ducts to make obstacles reflectionless