1. A method to credit media presented by a media presentation device, the method comprising: determining, using a neural network at a stationary unit, a first distance of a first portable audio detector from the stationary unit, the first portable audio detector associated with a first panelist, the stationary unit located in proximity to the media presentation device; determining, using the neural network, a second distance of a second portable audio detector from the stationary unit, the second portable audio detector associated with a second panelist; in response to the first distance being less than a threshold distance, crediting the media as exposed to the first panelist; and in response to the second distance being more than the threshold distance, not crediting the media as exposed to the second panelist.