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  • Book
    Kazuhiro Iida.
    Summary: This book covers all aspects of head-related transfer function (HRTF), from the fundamentals through to the latest applications, such as 3D sound systems. An introductory chapter defines HRTF, describes the coordinate system used in the book, and presents the most recent research achievements in the field. HRTF and sound localization in the horizontal and median planes are then explained, followed by discussion of individual differences in HRTF, solutions to this individuality (personalization of HRTF), and methods of sound image control for an arbitrary 3D direction, encompassing both classic theory and state of the art data. The relations between HRTF and sound image distance and between HRTF and speech intelligibility are fully explored, and measurement and signal processing methods for HRTF are examined in depth. Here, supplementary material is provided to enable readers to measure and analyze HRTF by themselves. In addition, some typical HRTF databases are compared. The final two chapters are devoted to the principles and applications of acoustic virtual reality. This clearly written book will be ideal for all who wish to learn about HRTF and how to use it in their research.

    Contents:
    Preface
    1 Introduction
    2 HRTF and sound localization in the horizontal plane
    3 HRTFs and sound localization in the median plane
    4 Individuality of HRTFs
    5 HRTF and sound image control for an arbitrary three-dimensional direction
    6 Directional band and spectral cue
    7 Distance perception and HRTF
    8 Speech intelligibility and the HRTF
    9 Measurement method for HRTF
    10 Signal processing of HRTF
    11 Comparison of HRTF databases
    12 Principle of three-dimensional sound reproduction
    13 Acoustic VR system
    Appendix 1 Perception of direction of an actual sound source
    Appendix 2 Transmission path of sound waves
    Appendix 3 Prediction method of room acoustics
    Appendix 4 Time window
    Appendix 5 Method for making an earplug-type microphone
    Appendix 6 HRTFs using 96-kHz sampling.
    Digital Access Springer 2019
  • Article
    O'Loughlin S, Schroeter AL, Jordon RE.
    Arch Dermatol. 1978 Jun;114(6):879-83.
    Twelve of 54 patients with systemic lupus erythematosus (SLE) had nonpuric, chronic urticaria-like lessions. Skin biopsy of the lesions was performed in 11 cases, and nine showed necrotizing vasculitis. The 54 patients, in general, had severe disease, and laboratory and clinical data suggested a postivite relationship between the urticaria-like lesions and disease severity. There was no consistent relationship between the course of the urticaria-like lesions and the serologic findings and clinical activity of the SLE. The frequency and importance of urticaria-like lesions in SLE deserve further study.
    Digital Access Access Options