ACOUSTIC SIGNAL REGENERATING METHOD

• Main Authors: SAGAWA HIROYUKI, INANAGA KIYOFUMI, MIURA MASAMI, IIDA YASUHIRO
• Format: Patent
• Language: English
• Published: 13.03.1990
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; STEREOPHONIC SYSTEMS

PURPOSE:To promptly and high-accurately detect the change of the direction of the head part of a listener by calculating the above-mentioned change based on the input signal of a detecting electromagnetic wave signal to be outputted from a detecting sound source device and the phase difference between the output signals of a pair of microphones to be arranged for two parts in the head part to pick up a detecting acoustic signal. CONSTITUTION:Microphones 3 and 4 are arranged for mutually separated two parts in a headphone device 2. An ultrasonic signal is supplied from an ultrasonic oscillating source 8 through the first modulating device 9 to a speaker 6 of a detecting sound source device 5 positioned at a separate position from the listener, and the speaker 6 outputs the detecting acoustic signal. Further, a prescribed frequency signal is supplied from an electromagnetic wave signal oscillating source 11 through the second modulating device 12 to a transmitter 7, and the transmitter 7 transmits the detecting electromagnetic wave signal. The change of the direction of the head part is calculated by an arithmetic unit 13 based on the output signal of a receiving device 21 to receive the detecting electromagnetic wave signal and the phase difference between the output signals of a pair of microphones 3 and 4 to pick up the detecting acoustic signal, and the acoustic signals of a left channel and a right channel are processed by an acoustic processor 26 based on transmission characteristics corresponding to the calculated direction of the head part.