RADIATION FROM A 2-DIMENSIONAL DUCT

An exact solution is obtained for the problem of the radiation of soun d from a semi-infinite duct, one plate of which is hard and the other soft. The solution of the problem results in a matrix Wiener-Hopf prob lem, which is solved by carrying out an exact matrix factorization. So me numerical results are given for the reflection coefficient, when th e lowest mode propagates. The problem can be considered as a first app roximation to an acoustically lined duct.