Don Keele, Jr. All arrays were analyzed assuming no extra drive signal processing other than frequency-independent shading. A weighted performance analysis yielded the following ranking from best to worse 6, 7, 5, 4, 3, 2, 1, with the CBT Legendre-shaded circular-arc array on top and the un-shaded straight-line array on the bottom.
For instance, a single loudspeaker with incorrect polarity may clearly compromise the sound level and directivity of the whole system. The identification of such errors, however, can be very time consuming. Therefore, it is desirable to have a fast, yet reliable procedure to finding such array elements.
This paper presents a step-by-step method to check the integrity of a line array and to find the cause in case of a polarity problem.
Besides the theoretical background, a successful practical case is described. This paper presents a new method that is able to calculate the relative time delays of multiple active sources to multiple microphones where previous methods are unable to. The calculated time delays can be used to compensate for delays that cause comb filtering and can also be used in source separation methods that utilize delays. The proposed method is shown to be able to calculate delays in configurations where other methods fail and is also able to give an estimate of sources physical positions.
The results show that multiple delays can be accurately calculated when multiple sources are active and that noise can effect the accuracy of the method. The signal alignment of these components is crucial to provide even level coverage and consistent spectral distribution throughout the audience areas.
