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achieved ACTIVE NOISE CONTROL algorithm ANC system approximation array processing asxou attenuation beam boundary element bungalow calculated cancellation COMPLEX HIGHWAY CROSS correlation covariance matrix CROSECT cross-section dB(A direction distance ESPRIT ALGORITHM estimate field focalization geometry Helmholtz equation HIGH RESOLUTION SONAR HIGHWAY CROSS SECTIONS hydrophones IEEE Institute of Acoustics INTERNAL WAVES iterations LEVELS FROM COMPLEX linear located low frequency maximum likelihood measured medium noise barriers number of snapshots obtained optimal beamformer output parameters PARAMETRIC ARRAY PRACTICAL RESULTS PREDICTION OF TRAFFIC pressure primary ratings ray tracing reflection refractive index RESOLUTION SONAR SYSTEM secondary sources self-tuning SENSOR POSITIONAL ERRORS SHADING COEFFICIENTS shown in Figure sidelobes signal processing simulated annealing simulator SOUND PROPAGATION sound source SOURCE LOCALIZATION space spatial window spectrum subarray subspace surface temperature TRAFFIC NOISE LEVELS transducer TRRL LISTENING ROOMS VALIDATION OF TRRL vector vehicle velocity wave equation wavenumber