Skip to the content

Spatial impression in multichannel surround sound systems

Hirst, JM 2006, Spatial impression in multichannel surround sound systems , PhD thesis, University of Salford.

[img] PDF
Download (1746kB)

    Abstract

    Spatial impression in both concert halls and reproduced sound has been identified as an important attribute of the listening experience. In this study, the synthesis and objective measurement of spatial impression in reproduced sound is examined. A novel, multichannel spatializing technique for musical synthesis has been developed that entailed the separation of the individual harmonics of a musical note that were spatially distributed over multichannel surround systems. Subjective testing of the techniques revealed that the perceived degree of spatial impression significantly increased as the angular spread of harmonics increased, however, extending the spatial spread beyond 90° did not significantly increase the perception of spatial impression. The concert hall measure of spatial impression, the interaural cross correlation coefficient (IACC) was used to objectively measure the effects of the spatializing techniques. The IACC measurements displayed a strong correlation to the subjective results. Further examination of the IACC measurement indicated the possibility of it’s adaptation to multichannel surround sound in general. A method of adapting IACC to reproduced sound was further developed that involved comparing IACC measurements taken in a concert hall to IACC measurements taken in reproduced versions of the same concert hall. The method was first conducted as a simulation using basic auralisation techniques. Real concert hall measurements and reproduction systems were then employed. Results showed that the method was able to discriminate between the spatial capabilities of a number of different surround sound systems and rank them in a predictable order. The results were further validated by means of a subjective test. In an attempt to sensitise the IACC measurement, the frequency dependency of IACC was investigated by means of a subjective test. The results indicated that a perceptually more accurate indication of spatial impression may be gained by applying a frequency-dependent weighting to IACC measurements. This may be useful in the spatial measurement of both reproduced sound and concert halls.

    Item Type: Thesis (PhD)
    Contributors: Davies, B(Supervisor) and Philipson, P (Supervisor)
    Uncontrolled Keywords: Surround sound, Spacial impression, Sound systems, Acoustics
    Themes: Subjects / Themes > T Technology > TK Electrical engineering. Electronics Nuclear engineering
    Subjects / Themes > Q Science > QC Physics > QC221-246 Acoustics - Sound
    Subjects / Themes > T Technology > TA Engineering (General). Civil engineering (General)
    Built and Human Environment
    Subjects outside of the University Themes
    Schools: Colleges and Schools > College of Science & Technology > School of the Built Environment
    Depositing User: Institutional Repository
    Date Deposited: 02 Sep 2009 11:34
    Last Modified: 18 Feb 2014 13:56
    URI: http://usir.salford.ac.uk/id/eprint/2226

    Document Downloads

    More statistics for this item...

    Actions (login required)

    Edit record (repository staff only)