External stereotactic processing device, external stereotactic processing method, and program

Abstract

To provide an out-of-head localization processing device, an out-of-head localization processing method and a program which can use a proper inverse filter.SOLUTION: An out-of-head localization processing device 100 according to an embodiment comprises: a frequency analysis part 111 which frequency-analyzes an input signal; an inverse filter part 41 which convolutes the inverse filter into the input signal to generate an output signal; a microphone 2L which collects the sound of the output signal output from an output unit; an adaptive control part 120 which calculates an error function on the basis of the input signal convoluted with a prescribed filter coefficient and a sound collection signal, performs adaptive control such that the error function becomes minimum, and changes an adaptive speed according to a result of frequency analysis; and a correction part which corrects the inverse filter according to the result of the adaptive control.SELECTED DRAWING: Figure 2

Claims

1. An input signal generation unit generates an input signal by adding a convolution signal, in which a spatial acoustic filter is convolved into multiple playback signals, A frequency analysis unit that performs frequency analysis on the aforementioned input signal, An inverse filter unit that convolves an inverse filter onto the input signal to generate an output signal, A headphone or earphone output unit that outputs the aforementioned output signal to the user's ears, A microphone, which is worn on the user's ear to acquire the sound signal, and which picks up the output signal output from the output unit, An adaptive control unit that calculates an error function based on the input signal, which has predetermined filter coefficients convolved into it, and the acquired sound signal, and performs adaptive control so that the error function is minimized, wherein the adaptive control unit changes the adaptive speed according to the result of the frequency analysis, An external positioning processing device comprising: a correction unit that corrects the inverse filter according to the result of the adaptive control;

2. When the signal level in a predetermined frequency range of the input signal is high, the adaptive speed is increased. The external positioning processing device according to claim 1, wherein the adaptive speed is slowed down when the signal level in a predetermined frequency range of the input signal is low.

3. The correction unit, The system determines whether the difference between the correction amount when the filter coefficients of the inverse filter were last updated and the current correction amount is greater than or equal to a predetermined value. The external positioning processing device according to claim 1 or 2, wherein if the difference in the correction amount is greater than or equal to a predetermined value, the filter coefficient of the inverse filter is updated and transmitted to the inverse filter unit.

4. The process involves generating an input signal by convolving multiple playback signals with a spatial acoustic filter and then adding them together, and The steps include: performing frequency analysis on the input signal; The steps include: convolving an inverse filter onto the input signal to generate an output signal; The headphone or earphone output unit outputs the output signal to the user's ears, The steps include: using a microphone attached to the user's ear to pick up the output signal output from the output unit and acquire the picked-up signal; The steps include: calculating an error function from the input signal and the acquired signal, which are convolved with predetermined filter coefficients, and performing adaptive control so that the error function is minimized; A step of changing the adaptive speed of the adaptive control according to the results of the frequency analysis, An extra-head localization processing method comprising the step of correcting the inverse filter based on the result of the adaptive control.

5. This is a program that causes a computer to perform an external stereotactic processing method. The above-mentioned extracephalic localization processing method is: The process involves generating an input signal by convolving multiple playback signals with a spatial acoustic filter and then adding them together, and The steps include: performing frequency analysis on the input signal; The steps include: convolving an inverse filter onto the input signal to generate an output signal; The headphone or earphone output unit outputs the output signal to the user's ears, The steps include: using a microphone attached to the user's ear to pick up the output signal output from the output unit and acquire the picked-up signal; The steps include: calculating an error function from the input signal and the acquired signal, which are convolved with predetermined filter coefficients, and performing adaptive control so that the error function is minimized; A step of changing the adaptive speed of the adaptive control according to the results of the frequency analysis, A program comprising the step of correcting the inverse filter based on the result of the adaptive control.

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