A system, computer-readable storage medium storing at least one program, and a computer-implemented method for identifying viewers of a television set is presented. An audio signal received by a microphone of the television metering device is monitored, the audio signal corresponding to audio of a television program presented on the television set and at least one audio tone generated by at least one audio transmitter of at least one viewer of the television set. The audio signal is analyzed to determine an identifier for the television program being presented on the television set and to identify an audio tone generated by an audio transmitter of a viewer. An identifier of the viewer associated with the audio tone is determined. An identifier for television metering device, the identifier for the television program, and the identifier of the viewer is transmitted to a server.