Patent ID: 8189430

Claim:
An apparatus comprising: at least two sound sensors for converting sounds into electric signals; means for determining an angular position of a sound source of a first sound wave as seen from the apparatus on the basis of moments of arrival of the first sound wave at the respective sound sensors which are represented by the electric signals, and determining an angular position of a sound source of a second sound wave as seen from the apparatus on the basis of moments of arrival of the second sound wave at the respective sound sensors which are represented by the electric signals, the second sound wave following the first sound wave in time domain; means for calculating a relative angle between the determined angular position of the sound source of the first sound wave and the determined angular position of the sound source of the second sound wave; and means for controlling a condition of the apparatus in response to the calculated relative angle; a monitor; and means for indicating controllable contents of the condition of the apparatus on the monitor; wherein said calculating means comprises means for setting a group of selection zones substantially centered at the determined angular position of the sound source of the first sound wave, and the number of the selection zones is equal to the number of the controllable contents indicated on the monitor.