---
name: "ch_lab"
section: "1"
platform: "linux"
package: "speech-tools"
version: "1:2.5.0-13+b4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/ch_lab"
---

# ch\_lab(1)

change/copy label files

## NAME

**ch\_lab** – change/copy label files

## SYNOPSIS

**ch\_lab** \[**-S** *frame* *spacing*\] \[**-start** *time*\] \[**-end** *time*\] \[**-ext** *file* *extension*\] \[**-extract** *file*\] \[**-extend** *time*\] \[**-f** *sample* *frequency*\] \[**-lf** *sample* *frequency*\] \[**-itype** *file* *type*\] \[**-key** *key* *file*\] \[**-lablist** *list* *of* *labels*\] \[**-length** *time*\] \[**-map** *map* *file*\] \[**-name** *feature* *name*\] \[**-class** *class*\] \[**-o** *output* *file*\] \[**-otype** *file* *type*\] \[**-pad** *high* \| *low*\] \[**-pos** *list* *of* *labels*\] \[**-q** *timestep*\] \[**-range** *range*\] \[**-sed** *sed* *file*\] \[fl shift *time* *delta*\] \[**-style** *output* *stype*\] \[**-vocab** *vocab* *file*\] \[**-verify**\] \[**-nopath**\] \[**-base**\] \[**-combine**\] \[**-divide**\] \[**-h**\] *input* *files* *...*

## DESCRIPTION

**ch\_lab** copies from one or more input label files to an output label file, optionally performing various operations along the way.

The following option flags are recognized:

- **-h**

  Print a summary of usage to standard output.

- **-S** *frame* *spacing*

  frame spacing of output

- **-start** *time*

  start time, in seconds, for label extraction

- **-end** *time*

  end time, in seconds, for label extraction

- **-ext** *file* *extension*

  filename extension to use for multiple output files

- **-extract** *file*

  extract a single file from a list of files

- **-extend** *time*

  extend track file by *time* seconds beyond label file

- **-f** *sample* *frequency*

  sample frequency of label file

- **-lf** *sample* *frequency*

  sample frequency for labels

- **-itype** *file* *type*

  type of input label file: esps htk ogi

- **-key** *key* *file*

  key label file

- **-lablist** *list*

  list of labels to be considered as blank

- **-length** *time*

  length of track produced, in seconds

- **-map** *map* *file*

  label mapping file

- **-name** *feature* *name*

  eg. Fo Phoneme

- **-class** *class*

  name of class defined in op file

- **-o** *output* *file*

  output file name

- **-otype** *file* *type*

  output file type: xmg, ascii, esps, htk

- **-pad** *high* \| *low*

  pad with high or low values

- **-pos** *list*

  list of labels to be regarded as 'pos'

- **-q** *timestep*

  quantize label timings to nearst value

- **-range** *range*

  difference between high and low values

- **-sed** *sed* *file*

  perform regex editing using sed file

- fl shift *time* *delta*

  shift the times of the labels

- **-style** *output* *style*

  output style e.g. track

- **-vocab** *file*

  file containing list of words in vocabulary

- **-verify**

  check that only labels in vocab file are in label file

- **-nopath**

  ignore pathnames when searching label lists

- **-base**

  use base filenames for lists of label files

- **-combine**

  - **-divide**

  ## SEE ALSO

[ch\_wave(1)](/ch_wave/1.md) [ch\_track(1)](/ch_track/1.md)