# This is a makemhr HRIR definition file. It is used to define the layout and # source data to be processed into an OpenAL Soft compatible HRTF. # # This definition is used to transform the left ear HRIRs from the full set # of KEMAR HRIRs provided by Bill Gardner <billg@media.mit.edu> and Keith # Martin <kdm@media.mit.edu> of MIT Media Laboratory. # # The data (full.zip) is available from: # # http://sound.media.mit.edu/resources/KEMAR.html # # It is copyrighted 1994 by MIT Media Laboratory, and provided free of charge # with no restrictions on use so long as the authors (above) are cited. # # This definition is used to generate the default HRTF table used by OpenAL # Soft. # The following are the data set metrics. They must always be specified at # the start of a definition file, but their order is not important. # Sampling rate of the HRIR data (in hertz). rate = 44100 # The channel type of incoming HRIR data (mono or stereo). Mono channel # inputs will result in mirroring to provide the right ear HRIRs. If not # specified, this defaults to mono. type = mono # The number of points to use from the HRIR data. This should be a # sufficiently large value (to encompass the entire impulse response). It # cannot be smaller than the truncation size (default is 32) specified on the # command line. points = 512 # The radius of the listener's head (measured ear-to-ear in meters). The # makemhr utility uses this value to rescale measured propagation delays when # a custom head radius is specified on the command line. It is also used as # the default radius when the spherical model is used to calculate an # approximate set of delays. This should match the data set as close as # possible for accurate rescaling when using the measured delays (the # default). At the moment, radius rescaling does not adjust HRIR coupling. radius = 0.09 # A list of the distances between the source and the listener (in meters) for # each field. These must start at or above the head radius and proceed in # ascending order. Since the MIT set is single-field, there is only one # distance. distance = 1.4 # A list of the number of azimuths measured for each elevation per field. # Elevations are separated by commas (,) while fields are separated by # semicolons (;). There must be at least 5 elevations covering 180 degrees # degrees of elevation for the data set to be viable. The poles (first and # last elevation) must be singular (an azimuth count of 1). azimuths = 1, 12, 24, 36, 45, 56, 60, 72, 72, 72, 72, 72, 60, 56, 45, 36, 24, 12, 1 # Following the metrics is the list of source HRIRs for each field, # elevation, and azimuth triplet. They don't have to be specified in order, # but the final composition must not be sparse. They can however begin above # a number of elevations (as typical for HRIR measurements). # # The field index is used to determine the distance coordinate (for mult- # field HRTFs) while the elevation and azimuth indices are used to determine # the resulting polar coordinates following OpenAL Soft's convention (-90 # degree elevation increasing counter-clockwise from the bottom; 0 degree # azimuth increasing clockwise from the front). # # More than one HRIR can be used per source. This allows the composition of # averaged magnitude responses or the specification of stereo HRTFs. Target # ears must (and can only be) specified for each source when the type metric # is set to 'stereo'. # # Source specification is of the form (~BNF): # # source = ( sf_index | mf_index ) source_ref [ '+' source_ref ]* # # sf_index = '[' ev_index ',' az_index ']' '=' # mf_index = '[' fd_index ',' ev_index ',' az_index ']' '=' # source_ref = mono_ref | stereo_ref # # fd_index = unsigned_integer # ev_index = unsigned_integer # az_index = unsigned_integer # mono_ref = ref_spec ':' filename # stereo_ref = ref_spec ':' filename ear # # ref_spec = ( wave_fmt '(' wave_parms ')' [ '@' start_sample ] ) | # ( bin_fmt '(' bini_parms ')' [ '@' start_byte ] ) | # ( bin_fmt '(' binf_parms ')' [ '@' start_byte ] ) | # ( ascii_fmt '(' asci_parms ')' [ '@' start_element ] ) | # ( ascii_fmt '(' ascf_parms ')' [ '@' start_element ] ) # filename = double_quoted_string # ear = 'left' | 'right' # # wave_fmt = 'wave' # wave_parms = channel # bin_fmt = 'bin_le' | 'bin_be' # bini_parms = 'int' ',' byte_size [ ',' bin_sig_bits ] [ ';' skip_bytes ] # binf_parms = 'fp' ',' byte_size [ ';' skip_bytes ] # ascii_fmt = 'ascii' # asci_parms = 'int' ',' sig_bits [ ';' skip_elements ] # ascf_parms = 'fp' [ ';' skip_elements ] # start_sample = unsigned_integer # start_byte = unsigned_integer # start_element = unsigned_integer # # channel = unsigned_integer # byte_size = unsigned_integer # bin_sig_bits = signed_integer # skip_bytes = unsigned_integer # sig_bits = unsigned_integer # skip_elements = unsigned_integer # # For bin_sig_bits, positive values mean the significant bits start at the # MSB (padding toward the LSB) while negative values mean they start at the # LSB. # Even though the MIT set is provided as stereo .wav files, each channel is # for a different sized KEMAR ear. Since it is not a stereo data set, no ear # is specified. The smaller KEMAR ear (in the left channel: 0) is used. 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