Audio reproducing apparatus

An audio reproducing apparatus comprising:

• first filtering means for convoluting into an input audio signal, an impulse response to which a transfer function from a position where the sound image of the input audio signal is located to the left ear of a listener is converted on a time domain;
• first reverberating means for performing a reverberation processing to the output signal of the first filtering means;
• second filtering means for convoluting into the input audio signal, an impulse response to which a transfer function from the position where the sound image of the input audio signal is located to the right ear of the listener is converted on the time domain;
• second reverberating means for performing a reverberation processing to the output signal of the second filtering means;
• third filtering means for extracting a low-frequency component from the input audio signal;
• first adder means for adding the output signal of the third filtering means to the output signal of the first reverberating means to obtain a first output audio signal;
• and
• second adder means for adding the output signal of the third filtering means to the output signal of the second reverberating means to obtain a second output audio signal.

An audio reproducing apparatus comprising:

• down-sampling means for down-sampling an input digital audio signal to generate a digital audio signal having a sampling frequency lower than the sampling frequency of the input digital audio signal;
• first filtering means for convoluting into the down-sampled digital audio signal, an impulse response to which a transfer function from a position where the sound image of the digital audio signal is located to the left ear of a listener is converted on a time domain;
• first over-sampling means for converting the sampling frequency of the output signal of the first filtering means to the sampling frequency of the input digital audio signal;
• second filtering means for convoluting into the down-sampled digital audio signal, an impulse response to which a transfer function from the position where the sound image of the digital audio signal is located to the right ear of the listener is converted on the time domain;
• second over-sampling means for converting the sampling frequency of the output signal of the second filtering means to the sampling frequency of the input digital audio signal;
• third filtering means for extracting at least a low-frequency component from the input digital audio signal;
• first adder means for adding the output signal of the third filtering means to the output signal of the first over-sampling means to obtain a first output audio signal;
• and
• second adder means for adding the output signal of the third filtering means to the output signal of the second over-sampling means to obtain a second output audio signal.

An audio reproducing apparatus comprising:

• a band-restriction filter for extracting a frequency component having a predetermined frequency or lower from an input audio signal;
• first filtering means for convoluting into the output audio signal of the band-restriction filter, an impulse response to which a transfer function from a position where the sound image of the output audio signal is located to the left ear of a listener is converted on a time domain;
• second filtering means for convoluting into the output audio signal of the band-restriction filter, an impulse response to which a transfer function from the position where the sound image of the output audio signal is located to the right ear of the listener is converted on the time domain;
• third filtering means for extracting a low-frequency component from the input audio signal;
• first adder means for adding the output signal of the third filtering means to the output signal of the first filtering means to obtain a first output audio signal;
• and
• second adder means for adding the output signal of the third filtering means to the output signal of the second filtering means to obtain a second output audio signal.