Head-related transfer function convolution method and head-related transfer function convolution device

A head-related transfer function convolution device configured, when an audio signal is reproduced acoustically by electro-acoustic conversion means disposed in a nearby position of both ears of a listener, to convolute a head-related transfer function into said audio signal, such that a sound image is localized in a perceived virtual sound image localization position, said head-related transfer function convolution device comprising:

• a storage unit configured to store, when a sound source is disposed in said virtual sound image localization position, and sound-collecting means are disposed in the position of said electro-acoustic conversion means,
• a measured direct wave direction head-related transfer function regarding a direction of a direct wave from said sound source to said sound-collecting means, and
• a measured reflected wave direction head-related transfer function regarding a direction of selected one reflected wave or reflected wave direction head-related transfer functions regarding directions of selected plurality of reflected waves, from said sound source to said sound-collecting means;
• and
• convolution means configured to read out said obtained direct wave direction head-related transfer function, and said reflected wave direction head-related transfer function regarding the direction of said selected one reflected wave or said reflected wave direction head-related transfer functions regarding the directions of said selected plurality of reflected waves, and convolute into said audio signal.

A head-related transfer function convolution method arranged, when an audio signal is reproduced acoustically by electro-acoustic conversion means disposed in a nearby position of both ears of a listener, to convolute a head-related transfer function into said audio signal, which allows the listener to listen to the audio signal such that a sound image is localized in a perceived virtual sound image localization position, said head-related transfer function convolution method comprising the steps of:

• obtaining beforehand, when a sound source is disposed in said virtual sound image localization position, and sound-collecting means are disposed in the position of said electro-acoustic conversion means,
• a direct wave convolution start point in time to start convolution of a direct wave direction head-related transfer function regarding a direction of a direct wave from said sound source to said sound-collecting means as to said audio signal, and
• a reflected wave convolution start point in time or a plurality of reflected wave convolution start points in time to start convolution of a reflected wave direction head-related transfer function regarding the direction of selected one reflected wave or the directions of selected plurality of reflected waves as to said audio signal, from said sound source to said sound-collecting means;
• holding data to be convoluted as to said audio signal from said direct wave convolution start point in time, and said one reflected wave convolution start point in time or said plurality of reflected wave convolution start points in time, respectively;
• and
• convoluting said held data as to said audio signal from said direct wave convolution start point in time, and said reflected wave convolution start point in time or said plurality of reflected wave convolution start points in time, respectively.

A head-related transfer function convolution device configured, when an audio signal is reproduced acoustically by electro-acoustic conversion means disposed in a nearby position of both ears of a listener, to convolute a head-related transfer function into said audio signal, such that a sound image is localized in a perceived virtual sound image localization position, said head-related transfer function convolution device comprising:

• means configured to perform convolution processing of the head-related transfer function, measured by a sound source being disposed in said virtual sound image localization position, and sound-collecting means being disposed in the position of said electro-acoustic conversion means, regarding a direction of a direct wave from said sound source to said sound-collecting means, as to said audio signal from a direct wave convolution start point in time set beforehand to start convolution as to said audio signal, as direct wave convolution data;
• and
• means configured to perform convolution processing of the head-related transfer function or head-related transfer functions, measured by the sound source being disposed in said virtual sound image localization position, and sound-collecting means being disposed in the position of said electro-acoustic conversion means, regarding a direction of a selected reflected wave or directions of selected plurality of reflected waves from said sound source to said sound-collecting means, as to said audio signal from one or plurality of reflected wave convolution start points in time set beforehand to start convolution as to said audio signal, as reflected wave convolution data.

A head-related transfer function convolution method arranged, when an audio signal is reproduced acoustically by an electro-acoustic conversion unit disposed in a nearby position of both ears of a listener, to convolute a head-related transfer function into said audio signal, which allows the listener to listen to the audio signal such that a sound image is localized in a perceived virtual sound image localization position, said head-related transfer function convolution method comprising the steps of:

• measuring, when a sound source is disposed in said virtual sound image localization position, and a sound-collecting unit is disposed in the position of said electro-acoustic conversion unit,
• a direct wave direction head-related transfer function regarding a direction of a direct wave from said sound source to said sound-collecting unit, and
• a reflected wave direction head-related transfer function regarding a direction of selected one reflected wave or reflected wave direction head-related transfer functions regarding directions of selected plurality of reflected waves, from said sound source to said sound-collecting unit, to obtain such head-related transfer functions, separately beforehand;
• and
• convoluting said obtained direct wave direction head-related transfer function, and said reflected wave direction head-related transfer function regarding the direction of said selected one reflected wave or said reflected wave direction head-related transfer functions regarding the directions of said selected plurality of reflected waves, into said audio signal.

A head-related transfer function convolution device configured, when an audio signal is reproduced acoustically by an electro-acoustic conversion unit disposed in a nearby position of both ears of a listener, to convolute a head-related transfer function into said audio signal, such that a sound image is localized in a perceived virtual sound image localization position, said head-related transfer function convolution device comprising:

• a storage unit configured to store, when a sound source is disposed in said virtual sound image localization position, and a sound-collecting unit is disposed in the position of said electro-acoustic conversion unit,
• a measured direct wave direction head-related transfer function regarding a direction of a direct wave from said sound source to said sound-collecting unit, and
• a measured reflected wave direction head-related transfer function regarding a direction of selected one reflected wave or reflected wave direction head-related transfer functions regarding directions of selected plurality of reflected waves, from said sound source to said sound-collecting unit;
• and
• a convolution unit configured to read out said obtained direct wave direction head-related transfer function, and said reflected wave direction head-related transfer function regarding the direction of said selected one reflected wave or said reflected wave direction head-related transfer functions regarding the directions of said selected plurality of reflected waves, and convolute into said audio signal.

A head-related transfer function convolution method arranged, when an audio signal is reproduced acoustically by an electro-acoustic conversion unit disposed in a nearby position of both ears of a listener, to convolute a head-related transfer function into said audio signal, which allows the listener to listen to the audio signal such that a sound image is localized in a perceived virtual sound image localization position, said head-related transfer function convolution method comprising steps of:

• obtaining beforehand, when a sound source is disposed in said virtual sound image localization position, and a sound-collecting unit is disposed in the position of said electro-acoustic conversion unit,
• a direct wave convolution start point in time to start convolution of a direct wave direction head-related transfer function regarding a direction of a direct wave from said sound source to said sound-collecting unit as to said audio signal, and
• a reflected wave convolution start point in time or a plurality of reflected wave convolution start points in time to start convolution of a reflected wave direction head-related transfer function regarding a direction of selected one reflected wave or the directions of selected plurality of reflected waves as to said audio signal, from said sound source to said sound-collecting unit;
• holding data to be convoluted as to said audio signal from said direct wave convolution start point in time, and said one reflected wave convolution start point in time or said plurality of reflected wave convolution start points in time, respectively;
• and
• convoluting said held data as to said audio signal from said direct wave convolution start point in time, and said reflected wave convolution start point in time or said plurality of reflected wave convolution start points in time, respectively.

A head-related transfer function convolution device configured, when an audio signal is reproduced acoustically by an electro-acoustic conversion unit disposed in a nearby position of both ears of a listener, to convolute a head-related transfer function into said audio signal, such that a sound image is localized in a perceived virtual sound image localization position, said head-related transfer function convolution device comprising:

• a unit configured to perform convolution processing of the head-related transfer function, measured by a sound source being disposed in said virtual sound image localization position, and a sound-collecting unit being disposed in the position of said electro-acoustic conversion unit, regarding a direction of a direct wave from said sound source to said sound-collecting unit, as to said audio signal from a direct wave convolution start point in time set beforehand to start convolution as to said audio signal, as direct wave convolution data;
• and
• a unit configured to perform convolution processing of the head-related transfer function or head-related transfer functions, measured by the sound source being disposed in said virtual sound image localization position, and the sound-collecting unit being disposed in the position of said electro-acoustic conversion unit, regarding a direction of a selected reflected wave or directions of selected plurality of reflected waves from said sound source to said sound-collecting unit, as to said audio signal from one or plurality of reflected wave convolution start points in time set beforehand to start convolution as to said audio signal, as reflected wave convolution data.