Patent ID: 7043036
Filing Date: 2006-05-09
Classification: H04S

Abstract:
1. 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 the listener is converted on a time domain; first over-sampling means for converting the sampling frequency of the out put 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; a delay circuit for delaying the input digital audio signal by a predetermined period and producing a delayed output signal; third filtering means for extracting at least a low-frequency component and a high frequency component from said delayed output the signal of the delay circuit; 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; wherein the third filtering means comprises a first low-pass filter and a second low-pass filter at least as a low-frequency-component extracting filter, and the third filtering means sends the output signal of the first low-pass filter to the first adder means, and sends the output signal of the second low-pass filter to the second adder means; wherein the third filtering means comprises a first high-pass filter and a second high-pass filter at least as a high-frequency-component extracting filter, and the third filtering means sends the output signal of the first high-pass filter to the first adder means, and sends the output signal of the second high-pass filter to the second adder means.