Patent ID: 6862356
Filing Date: 2005-03-01
Classification: H04R,H04S

Abstract:
1. An audio device comprising: a correction circuit having given transfer functions, which audio device supplies, through said correction circuit, right- and left-channel input audio signals on which head related transfer functions are superimposed, to right- and left-channel speakers located in front of a hearing position of a listener in a reproduction sound field space, wherein said correction circuit includes first to fourth operator circuits, and first and second adder circuits, and correction transfer functions obtained by an inverse matrix of a two-row and two-column matrix of which the elements are the following first to fourth transfer functions are implanted in said first to third operator circuits, said first transfer function is obtained from a third impulse response series, which is extracted from a second impulse response series of a first impulse response series, which said second impulse response series is featured by a sound field characteristic from a left-channel speaker to the listener when said left-channel speaker is disposed in an anechoic room as a model of a component layout in said reproduction sound field space, said first impulse response series being featured by a sound field characteristic of a space ranging from a left-channel speaker to the left ear of the listener when said left-channel speaker is disposed in said reproduction sound field space, said second transfer function is obtained from a sixth impulse response series, which is extracted from a fifth impulse response series of a fourth impulse response series, which said fifth impulse response series is featured by a sound field characteristic of a space ranging from a left-channel speaker to the right ear of the listener when said left-channel speaker is disposed in an anechoic room as a model of a component layout in said reproduction sound field space, said fourth impulse response series being featured by a sound field characteristic of a space ranging from a left-channel speaker to the right ear of the listener when said left-channel speaker is disposed in said reproduction sound field space, said third transfer function is obtained from a ninth impulse response series, which is extracted from an eighth impulse response series of a seventh impulse response series, which said eighth impulse response series is featured by a sound field characteristic of a space ranging from a right-channel speaker to the left ear of the listener when said left-channel speaker is disposed in an anechoic room as a model of a component layout in said reproduction sound field space, said seventh response series being featured by a sound field characteristic of a space ranging from a right-channel speaker to the left ear of the listener when said right-channel speaker is disposed in said reproduction sound field space, and said fourth transfer function is obtained from a 12th impulse response series, which is extracted from an 11th impulse response series of a 10th impulse response series, which said 11th impulse response series is featured by a sound field characteristic of a space ranging from a right-channel speaker to the right ear of the listener when said right-channel speaker is disposed in an anechoic room as a model of a component layout in said reproduction sound field space, said 10th response series being featured by a sound field characteristic of a space ranging from a right-channel speaker to the right ear of the listener when said right-channel speaker is disposed in said reproduction sound field space, and said first adder circuit adds together output signals of said first and third operator circuits when said left-channel input audio signal is input to said first operator circuit, and said right-channel input audio signal is input to said third operator circuit, and said second adder circuit adds together output signals of said second and fourth operator circuits when said left-channel input audio signal is input to said second operator circuit, and said right-channel input audio signal is input to said fourth operator circuit.