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ME_SPEC(1-ESPS)                             ENTROPIC RESEARCH LAB



NNNNAAAAMMMMEEEE
     me_spec - Generate maximum-entropy  spectra  from  parameter
     vectors.

SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
     mmmmeeee____ssssppppeeeecccc [ ----nnnn _n_u_m__f_r_e_q_s ] [ ----oooo _m_a_x__o_r_d_e_r ] [ ----rrrr _r_a_n_g_e ] [ ---- xxxx
     _d_e_b_u_g__l_e_v_e_l ] [ ----GGGG ]
     [ ----PPPP _p_a_r_a_m_s ] _i_n_p_u_t _o_u_t_p_u_t._s_p_e_c

DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
     _M_e__s_p_e_c reads spectral parameters and other information from
     the input file and generates a corresponding spectral record
     file containing  logarithmically  scaled  (in  dB)  maximum-
     entropy spectral power densities.

     The spectral  parameters  may  be  reflection  coefficients,
     autoregressive-filter  coefficients, or any of several other
     types of parameters; see _s_p_e_c__r_e_p in the Parameters  section
     and the documentation for reps_rc(3-ESPS) for a list.  Other
     required information includes the total power, the order  of
     the  spectrum,  and  the  sampling  frequency.  These may be
     obtained from the input file, or defaults may be  used;  see
     the    descriptions    of    the    parameters    _m_a_x__o_r_d_e_r,
     _s_a_m_p__f_r_e_q__n_a_m_e, _s_a_m_p__f_r_e_q, _p_o_w_e_r__f_i_e_l_d, and _p_o_w_e_r. FEA_ANA(5
     - ESPS)  files  are suitable as input and are specially pro-
     vided for, but any vector field of type  _f_l_o_a_t  in  any  FEA
     file  may be treated as a vector of spectral parameters; see
     _s_p_e_c__p_a_r_a_m__f_i_e_l_d and _s_p_e_c__r_e_p in the Parameters section.

     The spectral values are computed for the specified number of
     frequencies,  which must be at least 2.  The frequencies are
     equispaced from 0 to half the sampling frequency.  There  is
     an  option to compute the spectrum to a lower order than the
     number of coefficients present in the analysis records.

     One output record is written for each input  record  in  the
     specified  range.  If ``-'' is given for the input file, the
     standard input is read.  If ``-'' is given  for  the  output
     file,  the  standard  output is written to.  The output file
     can be plotted using the plotspec(1-ESPS) command.

OOOOPPPPTTTTIIIIOOOONNNNSSSS
     The following options are supported.  Values in brackets are
     defaults.

     ----nnnn _n_u_m__f_r_e_q_s [513]
          Compute spectral values for this number of frequencies,
          equispaced from 0 to half the sampling frequency.  Must
          be at least 2.

     ----oooo _m_a_x__o_r_d_e_r
          Maximum-entropy spectra of at most this order  will  be



        Copyright Entropic Research Laboratory, Inc. 1G1        1






ME_SPEC(1-ESPS)                             ENTROPIC RESEARCH LAB



          computed,  even when more coefficients are available in
          the analysis records.  The program converts  the  spec-
          tral  parameters  to  reflection coefficients, carrying
          the computation out to the actual order of the  parame-
          ter  set  contained  in  the record.  In FEA_ANA files,
          when ----GGGG has not been specified,  the  actual  order  is
          given  by  the  header  item  _o_r_d_e_r__v_c_d, for records in
          which the _f_r_a_m_e__t_y_p_e field is VOICED or TRANSITION, and
          by  _o_r_d_e_r__u_n_v_c_d  in  other records.  In other files, or
          when ----GGGG has been specified, the actual order is assumed
          to  be  the  length  of  the field (or subsequence of a
          field) named by the parameter  _s_p_e_c__p_a_r_a_m__f_i_e_l_d.  After
          converting  the  parameters,  the program truncates the
          sequence of reflection coefficients to length _m_a_x__o_r_d_e_r
          and  computes a maximum_entropy spectrum from the trun-
          cated sequence.

          This procedure is _n_o_t equivalent to  simply  truncating
          the  original parameter set, for example by specifing a
          shorter field with _s_p_e_c__p_a_r_a_m__f_i_e_l_d.  The  latter  pro-
          cedure  may  give  incorrect  results, depending on the
          spectral representation (see _s_p_e_c__r_e_p in the Parameters
          section).   For  example,  the  _m autoregressive filter
          coefficients of order _m are not in general the same  as
          the first _m autoregressive filter coefficients of order
          _n (where _n>_m).

     ----rrrr _f_i_r_s_t::::_l_a_s_t [(first in file):(last in file)]

     ----rrrr _f_i_r_s_t::::++++_i_n_c_r
          In the first form, a pair of unsigned  integers  speci-
          fies  the  range  of  records  to be processed.  Either
          _f_i_r_s_t or _l_a_s_t may be omitted; then the default value is
          used.   If  _l_a_s_t  = _f_i_r_s_t + _i_n_c_r, the second form (with
          the plus sign) specifies the same range as  the  first.
          If  the  specified  range  contains  records not in the
          file, _m_e__s_p_e_c complains and quits.

     ----xxxx _d_e_b_u_g__l_e_v_e_l [0]
          If _d_e_b_u_g__l_e_v_e_l is non-zero,  _m_e__s_p_e_c  prints  debugging
          messages  and  other  information on the standard error
          output.

     ----GGGG    Even if the input  file  is  a  FEA_ANA  file,  it  is
          treated  like  any  other FEA file.  Special processing
          does not take place for determining filter  order  from
          voicing  or  computing  average  power  from individual
          pulse powers and durations in multipulse FEA_ANA files.
          The  parameter  file must supply values for the parame-
          ters _s_p_e_c__p_a_r_a_m__f_i_e_l_d, _s_p_e_c__r_e_p, _p_o_w_e_r__f_i_e_l_d or  _p_o_w_e_r,
          and  _s_a_m_p__f_r_e_q__n_a_m_e  or _s_a_m_p__f_r_e_q.  The filter order is
          taken to be  the  length  of  the  field  specified  by



        Copyright Entropic Research Laboratory, Inc. 2G2        2






ME_SPEC(1-ESPS)                             ENTROPIC RESEARCH LAB



          _s_p_e_c__p_a_r_a_m__f_i_e_l_d;  but  see  the  discussion  of the ----oooo
          option.

     ----PPPP _p_a_r_a_m_s[params]
          The name of the parameter file.

EEEESSSSPPPPSSSS CCCCOOOOMMMMMMMMOOOONNNN
     The ESPS common file is not referred to.

EEEESSSSPPPPSSSS PPPPAAAARRRRAAAAMMMMEEEETTTTEEEERRRRSSSS
     The following parameters are read as required.

     _n_u_m__f_r_e_q_s - _i_n_t_e_g_e_r
          The number of frequencies for which spectral values are
          computed.   The value in the parameter file is not used
          if a value is specified with the command-line option  ----
          nnnn....  The  default  value and restrictions are as for the
          argument of the option.

     _m_a_x__o_r_d_e_r - _i_n_t_e_g_e_r
          An upper bound on  the  order  of  the  maximum-entropy
          spectra that will be computed.  The value in the param-
          eter file is not used if a value is specified with  the
          command-line option ----oooo.... See the discussion of ----oooo in the
          Options section for the detailed interpretation of this
          parameter.

     _s_t_a_r_t - _i_n_t_e_g_e_r
          The number of the first record to be processed,  count-
          ing the first in the input file as number 1.  The value
          in the parameter file is not used if a  starting  value
          is given with the ----rrrr option.  The default value is 1.

     _n_a_n - _i_n_t_e_g_e_r
          The number of records to be processed.   The  value  in
          the  parameter  file  is  not  used if the ----rrrr option is
          specified.  By convention, a value of 0 means that  all
          records from the starting record through the end of the
          file are processed.  This also the default behavior  in
          case  no  value is specified either on the command line
          or in the parameter file.

     _s_p_e_c__p_a_r_a_m__f_i_e_l_d - _s_t_r_i_n_g
          The field containing  the  spectral  parameters.   This
          must  be  explicitly  specified  in  the parameter file
          unless the input file is a FEA_ANA file  and  the   ---- GGGG
          option  is  not specified.  The default in that case is
          "spec_param".  This parameter may  be  simply  a  field
          name, or it may be of the form

          _f_i_e_l_d-_n_a_m_e[[[[_g_r_a_n_g_e]]]],




        Copyright Entropic Research Laboratory, Inc. 3G3        3