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Generation of spatial downmixes from parametric representations of multi channel signals

A multi-channel and signal technology, applied in stereo systems, electrical components, etc., can solve problems such as transmission bandwidth or high computational complexity, and achieve the effect of reducing computational complexity and extending playback length

Active Publication Date: 2009-04-08
DOLBY INT AB +1
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Problems solved by technology

Therefore, the entire set of multi-channel signals needs to be transmitted or the parametric representation needs to be completely reconstructed before applying the head-related transfer function or crosstalk cancellation filter, so the transmission bandwidth or computational complexity is unacceptably high

Method used

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  • Generation of spatial downmixes from parametric representations of multi channel signals
  • Generation of spatial downmixes from parametric representations of multi channel signals
  • Generation of spatial downmixes from parametric representations of multi channel signals

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Embodiment Construction

[0039] The embodiments described below are merely illustrations of the principles of the invention for binaural decoding of multi-channel signals by morphed HRTF filtering. It is understood that modifications and variations to the arrangements described herein will be apparent to those skilled in the art. Therefore, it is the intention to be limited only by the scope of the independent claims and not by the specific details presented by the description and illustration of the embodiments herein.

[0040] In order to better summarize the features and advantages of the present invention, a more detailed description of the prior art will now be given.

[0041] figure 1 Traditional binaural synthesis algorithms are outlined. A set of input channels (Left Front (LF), Right Front (RF), Left Surround (LS), Right Surround (RS), and Center (C)) 10a, 10b, 10c, 10d, and 10e using a set of HRTFs 12a to 12j to filter. Each input signal is split into 2 signals (left "L" and right "R" co...

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Abstract

A headphone down mix signal (314) can be efficiently derived from a parametric down mix of a multi-channel signal (312), when modified HRTFs (310) (head related transfer functions) are derived from HRTFs (308) of a multi-channel signal using a level parameter (306) having information on a level relation between two channels of the multi-channel signals such that a modified HRTF (310) is stronger influenced by the HRTF (308) of a channel having a higher level than by the HRTF (308) of a channel having a lower level. Modified HRTFs (310) are derived within the decoding process taking into account the relative strength of the channels associated to the HRTFs (308). The HRTFs (308) are thus modified such that a down mix signal (314) of a parametric representation of a multi-channel signal can directly be used to synthesize the headphone down mix signal (314) without the need of an intermediate full parametric multi-channel reconstruction of the parametric down mix.

Description

technical field [0001] The present invention relates to the decoding of encoded multi-channel audio signals from parametric multi-channel representations, in particular to 2-channel downmixing (e.g. headphone compatible downmixing or spatial downmixing for 2 loudspeaker installations) providing a spatial listening experience ) generation. Background technique [0002] Recent developments in audio coding make it possible to recreate a multi-channel representation of an audio signal from a stereo (or mono) signal and corresponding control data. These methods differ from older matrix-based solutions such as Dolby Pro Logic because additional control data is transmitted to control the reconstruction of the surround channels (also known as upmixing) depending on the mono or stereo channel transmitted. very different. [0003] Thus, such a parametric multi-channel audio decoder (eg MPEG Surround) reconstructs N channels from M transport channels and additional control data, wher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04S3/00
CPCH04S2420/01H04S2400/01H04S3/002H04S3/008H04S3/004H04S3/00
Inventor 拉斯·维尔默斯克里斯托弗·薛林耶罗恩·布里巴特
Owner DOLBY INT AB
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