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Manual Reference Pages  -  POCKETSPHINX_CONTINUOUS (1)


pocketsphinx_continuous - Run speech recognition in continuous listening mode




pocketsphinx_continuous -hmm hmmdir -dict dictfile [ options ]...


This program opens the audio device and waits for speech. When it detects an utterance, it performs speech recognition on it.
-adcdev name for audio input (platform-specific)
-adchdr Size of audio file header in bytes (headers are ignored)
-adcin Input is raw audio data
-agc Automatic gain control for c0 (’max’, ’emax’, ’noise’, or ’none’)
  Initial threshold for automatic gain control
  Do phoneme recognition
-alpha Preemphasis parameter
  Print back trace of recognition results
-beam Beam width applied to every frame in Viterbi search (smaller values mean wider beam)
  Run bestpath (Dijkstra) search over word lattice (3rd pass)
  Language model probability weight for bestpath search
  Cache senone scores from first pass search
  Input is cepstral files, output is log spectral files
-cepdir files directory (prefixed to filespecs in control file)
-cepext Input files extension (prefixed to filespecs in control file)
-ceplen Number of components in the input feature vector
-cmn Cepstral mean normalization scheme (’current’, ’prior’, or ’none’)
-cmninit Initial values (comma-separated) for cepstral mean when ’prior’ is used
  Compute all senone scores in every frame (can be faster when there are many senones)
-ctl file listing utterances to be processed
  No. of utterances to be processed (after skipping -ctloffset entries)
-ctlincr Do every Nth line in the control file
  No. of utterances at the beginning of -ctl file to be skipped
-dict pronunciation dictionary (lexicon) input file
-dither Add 1/2-bit noise
  Use double bandwidth filters (same center freq)
-dsratio Frame GMM computation downsampling ratio
-fbtype FB Type of mel_scale or log_linear
-fdict word pronunciation dictionary input file
-feat Feature stream type, depends on the acoustic model
-fillpen Filler word transition penalty
-frate Frame rate
-fsg state grammar
-fsgbfs Force backtrace from FSG final state
  finite state grammar control file
  Use alternative pronunciations for FSG
  (FSG Mode (Mode 2) only) Insert filler words at each state.
-fwd3g Use trigrams in first pass search
-fwdflat Run forward flat-lexicon search over word lattice (2nd pass)
  Beam width applied to every frame in second-pass flat search
  Minimum number of end frames for a word to be searched in fwdflat search
  Language model probability weight for flat lexicon (2nd pass) decoding
  Window of frames in lattice to search for successor words in fwdflat search
  Beam width applied to word exits in second-pass flat search
-fwdtree Run forward lexicon-tree search (1st pass)
-hmm containing acoustic model files.
-hyp output file name
-hypseg output with segmentation file name
  Endianness of input data, big or little, ignored if NIST or MS Wav
  Maximum number of Gaussians per leaf node in kd-Trees
  Maximum depth of kd-Trees to use
-kdtree file for Gaussian selection
-latsize Lattice size
-lifter Length of sin-curve for liftering, or 0 for no liftering.
-live Get input from audio hardware
-lm trigram language model input file
-lmctl a set of language model
The -hmm and -dict arguments are always required. Either -lm or -fsg is required, depending on whether you are using a statistical language model or a finite-state grammar.


Written by numerous people at CMU from 1994 onwards. This manual page by David Huggins-Daines <>


Copyright © 1994-2007 Carnegie Mellon University. See the file COPYING included with this package for more information.


pocketsphinx_batch(1), sphinx_fe(1).
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