utils/MIT_KEMAR.def

   1 # This is a makemhr HRIR definition file.  It is used to define the layout and
   2 # source data to be processed into an OpenAL Soft compatible HRTF.
   3 #
   4 # This definition is used to transform the left ear HRIRs from the full set
   5 # of KEMAR HRIRs provided by Bill Gardner <billg@media.mit.edu> and Keith
   6 # Martin <kdm@media.mit.edu> of MIT Media Laboratory.
   7 #
   8 # The data (full.zip) is available from:
   9 #
  10 #  http://sound.media.mit.edu/resources/KEMAR.html
  11 #
  12 # It is copyrighted 1994 by MIT Media Laboratory, and provided free of charge
  13 # with no restrictions on use so long as the authors (above) are cited.
  14 #
  15 # This definition is used to generate the default HRTF table used by OpenAL
  16 # Soft.
  17
  18 # The following are the data set metrics.  They must always be specified at
  19 # the start of a definition file, but their order is not important.
  20
  21 # Sampling rate of the HRIR data (in hertz).
  22 rate     = 44100
  23
  24 # The channel type of incoming HRIR data (mono or stereo).  Mono channel
  25 # inputs will result in mirroring to provide the right ear HRIRs.  If not
  26 # specified, this defaults to mono.
  27 type     = mono
  28
  29 # The number of points to use from the HRIR data.  This should be a
  30 # sufficiently large value (to encompass the entire impulse response).  It
  31 # cannot be smaller than the truncation size (default is 32) specified on the
  32 # command line.
  33 points   = 512
  34
  35 # The radius of the listener's head (measured ear-to-ear in meters).  The
  36 # makemhr utility uses this value to rescale measured propagation delays when
  37 # a custom head radius is specified on the command line.  It is also used as
  38 # the default radius when the spherical model is used to calculate an
  39 # approximate set of delays.  This should match the data set as close as
  40 # possible for accurate rescaling when using the measured delays (the
  41 # default).  At the moment, radius rescaling does not adjust HRIR coupling.
  42 radius   = 0.09
  43
  44 # A list of the distances between the source and the listener (in meters) for
  45 # each field.  These must start at or above the head radius and proceed in
  46 # ascending order.  Since the MIT set is single-field, there is only one
  47 # distance.
  48 distance = 1.4
  49
  50 # A list of the number of azimuths measured for each elevation per field.
  51 # Elevations are separated by commas (,) while fields are separated by
  52 # semicolons (;).  There must be at least 5 elevations covering 180 degrees
  53 # degrees of elevation for the data set to be viable.  The poles (first and
  54 # last elevation) must be singular (an azimuth count of 1).
  55 azimuths = 1, 12, 24, 36, 45, 56, 60, 72, 72, 72, 72, 72, 60, 56, 45, 36, 24, 12, 1
  56
  57 # Following the metrics is the list of source HRIRs for each field,
  58 # elevation, and azimuth triplet.  They don't have to be specified in order,
  59 # but the final composition must not be sparse.  They can however begin above
  60 # a number of elevations (as typical for HRIR measurements).
  61 #
  62 # The field index is used to determine the distance coordinate (for mult-
  63 # field HRTFs) while the elevation and azimuth indices are used to determine
  64 # the resulting polar coordinates following OpenAL Soft's convention (-90
  65 # degree elevation increasing counter-clockwise from the bottom; 0 degree
  66 # azimuth increasing clockwise from the front).
  67 #
  68 # More than one HRIR can be used per source.  This allows the composition of
  69 # averaged magnitude responses or the specification of stereo HRTFs.  Target
  70 # ears must (and can only be) specified for each source when the type metric
  71 # is set to 'stereo'.
  72 #
  73 # Source specification is of the form (~BNF):
  74 #
  75 #  source = ( sf_index | mf_index ) source_ref [ '+' source_ref ]*
  76 #
  77 #  sf_index = '[' ev_index ',' az_index ']' '='
  78 #  mf_index = '[' fd_index ',' ev_index ',' az_index ']' '='
  79 #  source_ref = mono_ref | stereo_ref
  80 #
  81 #  fd_index   = unsigned_integer
  82 #  ev_index   = unsigned_integer
  83 #  az_index   = unsigned_integer
  84 #  mono_ref   = ref_spec ':' filename
  85 #  stereo_ref = ref_spec ':' filename ear
  86 #
  87 #  ref_spec = ( wave_fmt  '(' wave_parms ')' [ '@' start_sample  ] ) |
  88 #             ( bin_fmt   '(' bini_parms ')' [ '@' start_byte    ] ) |
  89 #             ( bin_fmt   '(' binf_parms ')' [ '@' start_byte    ] ) |
  90 #             ( ascii_fmt '(' asci_parms ')' [ '@' start_element ] ) |
  91 #             ( ascii_fmt '(' ascf_parms ')' [ '@' start_element ] )
  92 #  filename = double_quoted_string
  93 #  ear      = 'left' | 'right'
  94 #
  95 #  wave_fmt      = 'wave'
  96 #  wave_parms    = channel
  97 #  bin_fmt       = 'bin_le' | 'bin_be'
  98 #  bini_parms    = 'int' ',' byte_size [ ',' bin_sig_bits ] [ ';' skip_bytes ]
  99 #  binf_parms    = 'fp'  ',' byte_size                      [ ';' skip_bytes ]
 100 #  ascii_fmt     = 'ascii'
 101 #  asci_parms    = 'int' ',' sig_bits  [ ';' skip_elements ]
 102 #  ascf_parms    = 'fp'                [ ';' skip_elements ]
 103 #  start_sample  = unsigned_integer
 104 #  start_byte    = unsigned_integer
 105 #  start_element = unsigned_integer
 106 #
 107 #  channel             = unsigned_integer
 108 #  byte_size           = unsigned_integer
 109 #  bin_sig_bits        = signed_integer
 110 #  skip_bytes          = unsigned_integer
 111 #  sig_bits            = unsigned_integer
 112 #  skip_elements       = unsigned_integer
 113 #
 114 # For bin_sig_bits, positive values mean the significant bits start at the
 115 # MSB (padding toward the LSB) while negative values mean they start at the
 116 # LSB.
 117
 118 # Even though the MIT set is provided as stereo .wav files, each channel is
 119 # for a different sized KEMAR ear.  Since it is not a stereo data set, no ear
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