1. An audience identification method comprising: detecting, by executing an instruction with a processor, an already asserted trigger signal being provided by an output of a media device meter; in response to determining, by executing an instruction with the processor, that an image captured by an image sensor does not correspond to any one of a plurality of recognized audiences, passing the already asserted trigger signal from the output of the media device meter to an input of a people meter to cause the people meter to output a prompt for entry of audience identification information; and in response to determining, by executing an instruction with the processor, that the image corresponds to a first one of the plurality of recognized audiences, blocking the already asserted trigger signal from being passed from the output of the media device meter to the input of the people meter to prevent the people meter from outputting the prompt.