Patent ID: 7949139
Filing Date: 2011-05-24
Classification: G01S,H04S

Abstract:
1. A method for measuring distance between an audio loudspeaker and a selected location, comprising: placing a microphone at the selected location, outputting an audio test signal from the audio loudspeaker, receiving the audio test signal at the microphone, measuring an impulse response to the audio test signal from the audio loudspeaker at the microphone to detect both a time delay of an initial pulse of the impulse response and width of the initial pulse of the impulse response at a predetermined level, calculating an initial raw distance value from the audio loudspeaker to the selected location as a function of the time delay of the initial pulse by retrieving, from a database, data correlating predetermined audio loudspeaker type characteristics and the time delay of the initial pulse to distance between the audio loudspeaker and the microphone, and applying the audio loudspeaker type characteristics, the time delay of the initial pulse, and width of the initial pulse to the data in the data base to output a correction factor for correcting distance calculation between the audio loudspeaker and the selected location and calculating a corrected distance value from the audio loudspeaker to the selected location by subtracting from the initial raw distance value, the pulse width of the initial pulse multiplied by the correction factor.