Method and apparatus for processing multimedia signals

• US 10,469,969 B2
• Filed: 09/17/2014
• Issued: 11/05/2019
• Est. Priority Date: 09/17/2013
• Status: Active Grant

• Current Assignee: GCOA Company Limited, WILUS Inc.
• Original Assignee: WILUS Inc.
• Inventors: Oh, Hyunoh, Lee, Taegyu
• Primary Examiner(s): Blair, Kile O
• Application Number:
  US15/022,923
• Publication Number:
  US 20160219388A1
• Time in Patent Office: 1,875 Days
• CPC Class Codes: G10L 19/008 Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
• CPC Class Codes: G10L 19/0204 using subband decomposition
• CPC Class Codes: G10L 25/48 specially adapted for particular use
• CPC Class Codes: H03H 17/0229 reducing the number of taps
• CPC Class Codes: H03H 17/0248 Filters characterised by a particular frequency response or filtering method
• CPC Class Codes: H03H 17/0266 Filter banks
• CPC Class Codes: H03H 17/0272 Quadrature mirror filters
• CPC Class Codes: H03H 21/0012 Digital adaptive filters
• CPC Class Codes: H04R 5/04 Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments combinations of amplifiers H03F3/68; stereophonic systems H04S
• CPC Class Codes: H04S 2400/01 Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
• CPC Class Codes: H04S 2400/03 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 Class Codes: H04S 2420/01 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 Class Codes: H04S 2420/03 Application of parametric coding in stereophonic audio systems
• CPC Class Codes: H04S 2420/07 Synergistic effects of band splitting and sub-band processing
• CPC Class Codes: H04S 2420/11 Application of ambisonics in stereophonic audio systems
• CPC Class Codes: H04S 3/00 Systems employing more than two channels, e.g. quadraphonic H04S5/00, H04S7/00 take precedence
• CPC Class Codes: H04S 3/002 Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution control circuits for electronic adaptation of the sound field H04S7/30
• CPC Class Codes: H04S 3/008 in which the audio signals are in digital form, i.e. employing more than two discrete digital channels data reduction aspects thereof based on psychoacoustics G10L19/02
• CPC Class Codes: H04S 3/02 of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
• CPC Class Codes: H04S 5/005 of the pseudo five- or more-channel type, e.g. virtual surround
• CPC Class Codes: H04S 7/30 : Control circuits for electronic adaptation of the sound field

Abstract

The present invention relates to a method and an apparatus for processing a signal, which are used for effectively reproducing a multimedia signal, and more particularly, to a method and an apparatus for processing a signal, which are used for implementing filtering for multimedia signal having a plurality of subbands with a low calculation amount.

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.

Claims

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.