Principles and Analysis of the Squeezing Approach to Low Bit Rate Spatial Audio Coding

Cheng, Bin; Ritz, Christian; Burnett, Ian

doi:10.1109/icassp.2007.366604

Cited by 16 publications

(30 citation statements)

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“…phase/level difference and correlation. Recently, Spatially Squeezed Surround Audio Coding (S 3 AC) [3,4] has been proposed as an alternative approach to spatial audio coding. Rather than other approaches that derive relationships between individual channels, S 3 AC is based on analysis of the localized soundfield sources and 'squeezing' them into a stereo space.…”

Section: Introductionmentioning

confidence: 99%

“…Rather than other approaches that derive relationships between individual channels, S 3 AC is based on analysis of the localized soundfield sources and 'squeezing' them into a stereo space. Results for coding of ITU 5.1 multichannel [5] audio signals have shown significant advantages of this approach in preserving the correct sound localization information [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…3 AC APPLIED TO AN ITU 5.1 CHANNEL SIGNAL S 3 AC [3,4], described previously for coding ITU 5.1 multichannel audio signals, achieves compression by exploiting the localization redundancy of the human auditory system [8]. In [4], a compressed (squeezed) stereo sound field was demonstrated as being able to carry the perceptual localization information of a 360° horizontal sound scene without side information.…”

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confidence: 99%

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A Spatial Squeezing approach to Ambisonic audio compression

Cheng

Ritz

Burnett

2008

2008 IEEE International Conference on Acoustics, Speech and Signal Processing

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Spatially squeezed surround audio coding (S3AC) has been previously shown to provide efficient coding with perceptually accurate soundfield reconstruction when applied to ITU 5.1 multichannel audio. This paper investigates the application of S3AC to the coding of Ambisonic audio recordings. Traditional ambisonics achieve compression and backward compatibility through the use of the UHJ matrixing approach to obtain a stereo signal. In this paper the relationship to Ambisonic B-format signals is described and alternative approaches that derive a stereo or mono-downmix signal based on S3AC are presented and evaluated. The mono-downmix approach utilizes side information consisting of spatial cues that are quantized based on novel source localization listening experiments. Objective and subjective tests demonstrate significant improvements in the localization of sound sources resulting from decoding the compressed B-format signals to a 5.1 speaker playback. A SPATIAL SQUEEZING APPROACH TO AMBISONIC AUDIO COMPRESSION Bin Cheng, Christian Ritz and Ian BurnettWhisper Laboratories, University of Wollongong, Wollongong, NSW, Australia bc362@uow.edu.au, critz@uow.edu.au, ianb@uow.edu.au ABSTRACTSpatially Squeezed Surround Audio Coding (S 3 AC) has been previously shown to provide efficient coding with perceptually accurate soundfield reconstruction when applied to ITU 5.1 multichannel audio. This paper investigates the application of S 3 AC to the coding of Ambisonic audio recordings. Traditional Ambisonics achieve compression and backward compatibility through the use of the UHJ matrixing approach to obtain a stereo signal. In this paper the relationship to Ambisonic B-format signals is described and alternative approaches that derive a stereo or mono-downmix signal based on S 3 AC are presented and evaluated. The mono-downmix approach utilizes side information consisting of spatial cues that are quantized based on novel source localization listening experiments. Objective and subjective tests demonstrate significant improvements in the localization of sound sources resulting from decoding the compressed B-format signals to a 5.1 speaker playback.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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A Spatial Squeezing approach to Ambisonic audio compression

Cheng

Ritz

Burnett

2008

2008 IEEE International Conference on Acoustics, Speech and Signal Processing

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“…More recently, Directional Audio Coding (DirAC) was proposed for both compression of loudspeaker signals as well as microphone array recordings and in (Ahonen et al, 2007), an application of DirAC to spatial teleconferencing was proposed. In this chapter, an alternative approach based on the authors' Spatially Squeezed Surround Audio Coding (S 3 AC) framework (Cheng et al, 2007) will be presented. In previous work, it has been shown that the S 3 AC approach can be successfully applied to the compression of multichannel loudspeaker signals (Cheng et al, 2007) and has some specific advantages over existing approaches such as Binaural Cue Coding (BCC) (Faller et al, 2003), Parametric Stereo and the MPEG Surround standard .…”

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confidence: 99%

“…In this chapter, an alternative approach based on the authors' Spatially Squeezed Surround Audio Coding (S 3 AC) framework (Cheng et al, 2007) will be presented. In previous work, it has been shown that the S 3 AC approach can be successfully applied to the compression of multichannel loudspeaker signals (Cheng et al, 2007) and has some specific advantages over existing approaches such as Binaural Cue Coding (BCC) (Faller et al, 2003), Parametric Stereo and the MPEG Surround standard . These include the accurate preservation of spatial location information whilst not requiring the transmission of additional side information representing the location of the spatial sound sources.…”

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confidence: 99%