Method and apparatus for processing multimedia signals

Patent metadata

Field	Value
Publication number	US-10469969-B2
Application number	US-201415022923-A
Country	US
Kind code	B2
Filing date	Sep 17, 2014
Priority date	Sep 17, 2013
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

To this end, provided are a method for processing a multimedia signal including: receiving a multimedia signal having a plurality of subbands; receiving at least one proto-type filter coefficients for filtering each subband signal of the multimedia signal; converting the proto-type filter coefficients into a plurality of subband filter coefficients; truncating each subband filter coefficients based on filter order information obtained by at least partially using characteristic information extracted from the corresponding subband filter coefficients, the length of at least one truncated subband filter coefficients being different from the length of truncated subband filter coefficients of another subband; and filtering the multimedia signal by using the truncated subband filter coefficients corresponding to each subband signal and an apparatus for processing a multimedia signal using the same.

First claim

What is claimed is:

1. A method for processing a multimedia signal, the method comprising:
receiving a multimedia signal having a plurality of subbands;
receiving one or more proto-type filter coefficients for filtering the multimedia signal;
converting the proto-type filter coefficients into a set of subband filter coefficients for each subband;
individually truncating the set of subband filter coefficients for each subband based on a filter order obtained by at least partially using energy decay time information determined for each subband from the set of subband filter coefficients, wherein the filter order determines a truncation length of the set of subband filter coefficients, and the filter order is determined to be variable in a frequency domain according to the energy decay time information of each subband; and
filtering the multimedia signal by using the truncated set of subband filter coefficients corresponding to each subband signal.

2. The method of claim 1 , wherein the filter order has a value of a multiple of the power of 2.

3. The method of claim 1 , wherein the multimedia signal includes multi-channel or multi-object signals, and
the proto-type filter coefficients are BRIR filter coefficients of a time domain.

4. The method of claim 1 , wherein the filter order has a single value for each subband.

5. An apparatus for processing a multimedia signal having a plurality of subbands, the apparatus comprising:
a parameterization unit configured to receive one or more proto-type filter coefficients for filtering the multimedia signal, convert the proto-type filter coefficients into a set of subband filter coefficients for each subband, and individually truncate the set of subband filter coefficients for each subband based on a filter order obtained by at least partially using energy decay time information determined for each subband from the set of subband filter coefficients, wherein the filter order determines a truncation length of the set of subband filter coefficients, and the filter order is determined to be variable in a frequency domain according to the energy decay time information of each subband; and
a rendering unit configured to receive the multimedia signal and filter the multimedia signal by using the truncated set of subband filter coefficients corresponding to each subband signal.

6. The apparatus of claim 5 , wherein the filter order has a value of a multiple of the power of 2.

7. The apparatus of claim 5 , wherein the multimedia signal includes multi-channel or multi-object signals, and
the proto-type filter coefficients are BRIR filter coefficients of a time domain.

8. The apparatus of claim 5 , wherein the filter order has a single value for each subband.

Assignees

• Wilus Inst Standards & Tech Inc

Inventors

• Oh Hyunoh
• Lee Taegyu

Classifications

• H04S2420/01

  Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD] · CPC title

• H04S5/005 Primary

  of the pseudo five- or more-channel type, e.g. virtual surround · CPC title

• H04S2400/03

  Aspects of down-mixing multi-channel audio to configurations with lower numbers of playback channels, e.g. 7.1 -> 5.1 (H04S2400/01 takes precedence) · CPC title

• H03H17/0272

  Quadrature mirror filters · CPC title

• H04S2420/03

  Application of parametric coding in stereophonic audio systems · CPC title