1SPHINX_FE(1)                General Commands Manual               SPHINX_FE(1)
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NAME

6       sphinx_fe - Convert audio files to acoustic feature files
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SYNOPSIS

9       sphinx_fe [ options ]...
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DESCRIPTION

12       This  program  converts  audio  files  (in  either  Microsoft WAV, NIST
13       Sphere, or raw format) to acoustic feature files for  input  to  batch-
14       mode speech recognition.  The resulting files are also useful for vari‐
15       ous other things.  A list of options follows:
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17       -alpha Preemphasis parameter
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19       -argfile
20              file (e.g. feat.params from an acoustic model) to  read  parame‐
21              ters  from.   This  will  override anything set in other command
22              line arguments.
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24       -blocksize
25              Number of samples to read at a time.
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27       -build_outdirs
28              Create missing subdirectories in output directory
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30       -c     file for batch processing
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32       -cep2spec
33              Input is cepstral files, output is log spectral files
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35       -di    directory, input file names are relative to this, if defined
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37       -dither
38              Add 1/2-bit noise
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40       -do    directory, output files are relative to this
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42       -doublebw
43              Use double bandwidth filters (same center freq)
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45       -ei    extension to be applied to all input files
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47       -eo    extension to be applied to all output files
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49       -example
50              Shows example of how to use the tool
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52       -frate Frame rate
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54       -help  Shows the usage of the tool
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56       -i     audio input file
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58       -input_endian
59              Endianness of input data, big or little, ignored if NIST  or  MS
60              Wav
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62       -lifter
63              Length of sin-curve for liftering, or 0 for no liftering.
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65       -logspec
66              Write out logspectral files instead of cepstra
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68       -lowerf
69              Lower edge of filters
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71       -mach_endian
72              Endianness of machine, big or little
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74       -mswav Defines input format as Microsoft Wav (RIFF)
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76       -ncep  Number of cep coefficients
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78       -nchans
79              Number of channels of data (interlaced samples assumed)
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81       -nfft  Size of FFT
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83       -nfilt Number of filter banks
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85       -nist  Defines input format as NIST sphere
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87       -npart Number of parts to run in (supersedes -nskip and -runlen if non-
88              zero)
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90       -nskip If a control file was specified, the  number  of  utterances  to
91              skip at the head of the file
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93       -o     cepstral output file
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95       -ofmt  Format of output files - one of sphinx, htk, text.
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97       -part  Index  of the part to run (supersedes -nskip and -runlen if non-
98              zero)
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100       -raw   Defines input format as raw binary data
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102       -remove_dc
103              Remove DC offset from each frame
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105       -round_filters
106              Round mel filter frequencies to DFT points
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108       -runlen
109              If a control file was specified, the  number  of  utterances  to
110              process, or -1 for all
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112       -samprate
113              Sampling rate
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115       -seed  Seed  for  random  number generator; if less than zero, pick our
116              own
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118       -smoothspec
119              Write out cepstral-smoothed logspectral files
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121       -sndfile
122              Use libsndfile to read input data
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124       -spec2cep
125              Input is log spectral files, output is cepstral files
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127       -sph2pipe
128              Input is NIST sphere (possibly with Shorten),  use  sph2pipe  to
129              convert
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131       -transform
132              Which  type  of  transform  to use to calculate cepstra (legacy,
133              dct, or htk)
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135       -unit_area
136              Normalize mel filters to unit area
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138       -upperf
139              Upper edge of filters
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141       -verbose
142              Show input filenames
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144       -warp_params
145              defining the warping function
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147       -warp_type
148              Warping function type (or shape)
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150       -whichchan
151              Channel to process (numbered from 1), or 0 to mix all channels
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153       -wlen  Hamming window length
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155       Currently the only kind of features supported are MFCCs  (mel-frequency
156       cepstral  coefficients).   There are numerous options which control the
157       properties of the output features.  It is VERY important that you docu‐
158       ment  the specific set of flags used to create any given set of feature
159       files, since this information is NOT recorded in the files  themselves,
160       and  any  mismatch  between the parameters used to extract features for
161       recognition and those used to extract features for training will  cause
162       recognition to fail.
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AUTHOR

165       Written  by numerous people at CMU from 1994 onwards.  This manual page
166       by David Huggins-Daines <dhuggins@cs.cmu.edu>
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169       Copyright © 1994-2007 Carnegie Mellon University.  See the file COPYING
170       included with this package for more information.
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174                                  2007-08-27                      SPHINX_FE(1)
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