Patent No. | 10,580,417 |
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Issue Date | March 03, 2020 |

Title | Method And Apparatus For Binaural Rendering Audio Signal Using Variable Order Filtering In Frequency Domain |

Inventorship | Taegyu Lee, Seongnam-si (KR) Hyunoh Oh, Gwacheon-si (KR) Youngcheol Park, Wonju-si (KR) Daehee Youn, Seoul (KR) Jeongil Seo, Daejeon (KR) Yongju Lee, Daejeon (KR) Seungkwon Beack, Seoul (KR) Kyeongok Kang, Daejeon (KR) Daeyoung Jang, Daejeon (KR) |

Assignee | INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY, Seoul (KR) WI... |

1. A method for binaural rendering an audio signal, comprising:receiving an input audio signal;

receiving a set of truncated subband filter coefficients for filtering each subband signal of the input audio signal, the set of truncated subband filter coefficients being at least a portion of a corresponding set of subband filter coefficients obtained from binaural room impulse response (BRIR) filter coefficients for binaural filtering of the input audio signal, a length of the set of truncated subband filter coefficients being individually determined for each subband based on characteristic information extracted from the corresponding set of subband filter coefficients, the length of the set of truncated subband filter coefficients being determined to be variable in a frequency domain, and the set of truncated subband filter coefficients being constituted by one or more FFT filter coefficients generated by performing fast Fourier transform (FFT) by a predetermined block size in a corresponding subband;

generating at least one subframe for each subband by performing fast Fourier transform of each subband signal based on a predetermined subframe size;

generating at least one filtered subframe for each subband, each filtered subframe being generated by multiplying a corresponding subframe and the FFT filter coefficients;

inverse fast Fourier transforming the at least one filtered subframe for each subband; and

generating a filtered subband signal by overlap-adding the at least one inverse fast Fourier transformed subframe for each subband.

receiving a set of truncated subband filter coefficients for filtering each subband signal of the input audio signal, the set of truncated subband filter coefficients being at least a portion of a corresponding set of subband filter coefficients obtained from binaural room impulse response (BRIR) filter coefficients for binaural filtering of the input audio signal, a length of the set of truncated subband filter coefficients being individually determined for each subband based on characteristic information extracted from the corresponding set of subband filter coefficients, the length of the set of truncated subband filter coefficients being determined to be variable in a frequency domain, and the set of truncated subband filter coefficients being constituted by one or more FFT filter coefficients generated by performing fast Fourier transform (FFT) by a predetermined block size in a corresponding subband;

generating at least one subframe for each subband by performing fast Fourier transform of each subband signal based on a predetermined subframe size;

generating at least one filtered subframe for each subband, each filtered subframe being generated by multiplying a corresponding subframe and the FFT filter coefficients;

inverse fast Fourier transforming the at least one filtered subframe for each subband; and

generating a filtered subband signal by overlap-adding the at least one inverse fast Fourier transformed subframe for each subband.