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来自「speech signal process tools」· DIFF 代码 · 共 144 行

.\" @(#)lpcsynt.1	3.9	02 Apr 1997
.\" Copyright (c) 1997 Entropic Research Lab, Inc.; all rights reserved
.ds ]W "\fI\s+4\ze\h'0.05'e\s-4\v'-0.4m'\fP\(*p\v'0.4m'\ Entropic Research Lab, Inc.
.TH LPCSYNT 1\-ESPS "02 Apr 1997"
.SH "NAME"
lpcsynt \- perform pitch-synchronous synthesis from FEA_ANA files
.SH "SYNOPSIS"
.B lpcsynt
[
.B \-x
] [
.BI \-P " param_file"
]
[
.BI \-r " range"
]
[
.BI \-p " range"
]
.I input_fea output_sd
.SH DESCRIPTION
.PP
This program must be used with files with a format such as that
created by \fIlpcana\fR(1\-ESPS).  Consider use of \fIlp_syn\fR(1\-ESPS).  
While still
supported, \fIlpcana\fR(1\-ESPS) and \fIlpcsynt\fR(1\-ESPS) should be considered obsolescent.
.PP
.I Lpcsynt
takes as input an ESPS FEA_ANA(5\-ESPS) file 
(\fIinput_fea\fR)
containing analysis information, performs pitch-synchronous synthesis,
and outputs the synthesized speech to an ESPS FEA_SD(5\-ESPS) file 
.I output_sd.  
The output file is written in short format.  
.PP
If "\-" is specified as the input file name, standard input is used;
if "\-" is specified as the output file name, standard output is used.
.SH OPTIONS
The following options are supported:
.TP
.B \-x
This option is specified for printing debugging message in the standard error.
.TP
.BI \-P " param_file"
uses the parameter file 
.I param_file
rather than the default which is
.I params.
.TP
.BI \-p " range"
Selects a subrange of points to be synthesized, where the start and end
points are defined with respect to the original SD file that is the
source of the input FEA_ANA file.  The range is specified using the format 
.I start\-end
or
.IR start:end
or
.IR start:+nan .
Either 
.I start
or 
.I end
may be omitted, in which case the omitted parameter defaults respectively
to the start or end of the input FEA_ANA file.  
.TP
.BI \-r " range"
\fBr\fP is a synonym for \fBp\fP.
.SH ESPS PARAMETERS
.PP
The values of parameters obtained from the parameter file are printed
if the environment variable ESPS_VERBOSE is 3 or greater.  The default
value is 3.
.PP
The following parameters are read from the params file:
.sp
.I "post_filt_num - float"
.IP
A three element vector specifying the numerator of a pole-zero
post processing filter.
If no values are specified in the parameter file,
the vector [1., -1., 0] is used.
.sp
.TP
.I "post_filt_den - float"
.IP
A three element vector specifying the denominator of a pole-zero
post processing filter.
If no values are specified in the parameter file,
the vector [1., -.875, 0.] is used.
.SH ESPS COMMON
.PP
ESPS Common is not processed.
.SH ESPS HEADERS
.PP
The following parameters are read from the header of the input 
FEA_ANA file:  
.I start, nan, nominal_frame_size, and src_sf.
.PP
.I
Synt
writes the following header items in the output FEA_SD file:
\fIsynt_order\fP (int), 
\fIsynt_method\fP (coded),
\fIsynt_interp\fP (coded),
\fIsynt_pwr\fP (coded),
\fIv_excit_method\fP (coded),
and
\fIuv_excit_method\fP (coded).
.PP
Also,
.I src_sf
is copied from the input header and used as 
\fIrecord_freq\fP in the output FEA_SD file.
.PP
In addition,
the generic header item \fIstart_time\fP (type DOUBLE)
is written in the output file.  
The value written is computed by taking the \fIstart_time\fP value from
the header of the input file (or zero, if such a header item doesn't
exist) and adding to it the offset time (from the
beginning of the original sampled data file) of the first point written
by \fIlpcsynt\fP (1\-\s-1ESPS\s+1).
.SH COMMENTS
The synthesizer implementation is very simple.  A single
impulse is used as the excitation function for each pitch pulse in
the case of voiced speech.  A gaussian white noise sequence is used as the
excitation function when the frame is unvoiced.
Linear interpolation is performed (for each pulse) on the
reflection coefficients, prior to synthesis.
.SH SEE ALSO
lpcana (1\-ESPS), ESPS(5\-ESPS), FEA_ANA(5\-ESPS),
.br
FEA_SD(5\-ESPS).
.SH "BUGS"
.PP
None known.
.SH "AUTHOR"
.PP
S. Shankar Narayan. Slight mods by John Shore.  
ESPS 3.0 modification by David Burton