VTX

NAME

vtx - convert lx to tx by Voiscope method

SYNOPSIS

vtx (-i item) (-H high-pass) (-L low-pass) (-C time-const) (-T threshold) (-o) file

DESCRIPTION

vtx estimates the location of pitch periods from a Layngograph waveform by the method employed in the Voiscope. This consists of: (i) filtering, (ii) agc, and (iii) peak following. Configuration of the filtering and the time constant of the peak following can be set by program options.

Options and their meanings are:

-I Identify program and exit.

-i item Select input item number.

-H high-pass Set high-pass frequency edge. Default=80Hz.

-L high-pass Set low-pass frequency edge. Default=2000Hz.

-C time-const Set time-constant of peak follower. Default=0.0025s.

-T Peak detection threshold Set threshold for peak detection. Default=750.

-o Output glottal opening points. Default: closings.

INPUT ITEMS

2.xx Laryngograph waveform.

OUTPUT ITEMS

3 Voiscope tx

VERSION/AUTHOR

2.0 - Mark Huckvale.

BUGS

Works best if Lx is right way up (up = more current flow).

SEE ALSO

HQtx
Wed Jul 17 22:31:35 2013