Another significant cause of error in accuracy is sound reverberation which produces estimations far off from the measured angle that tend to occur with similar precision to acceptable estimations. Errors in precision occur in part because the sample rate and the speed of sound appear as constants in the angle estimation formula, when in reality they vary slightly. Furthermore, the actual speed of sound can only be estimated. The above two constraints are accounted for with a scaling factor. The average highest lag is calibrated to represent 90 degrees.
Background noise is an unavoidable factor which also contributes to errors in precision.
A significant amount of tests were performed to determine the accuracy of the system. Some of the results of these tests are displayed in the chart below. It can be seen in this chart that the error in the system increases as the angle increases. This was an anticipated result, due to the non-linear distribution of the possible lags, as described above. There are less possible lags for higher angles than lower, so there is less accuracy at higher angles.