---
name: "sphinx_pitch"
section: "1"
platform: "linux"
package: "sphinxbase-utils"
version: "0.8+5prealpha+1-21+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/sphinx_pitch"
---

# sphinx\_pitch(1)

Extract pitch from audio files

## NAME

sphinx\_pitch - Extract pitch from audio files

## SYNOPSIS

**sphinx\_pitch** \[ *options* \]...

## DESCRIPTION

This program reads audio files and analyzes them for pitch and voicing.

- **-c**

  file for batch processing

- **-di**

  directory, input file names are relative to this, if defined

- **-do**

  directory, output files are relative to this

- **-ei**

  extension to be applied to all input files

- **-eo**

  extension to be applied to all output files

- **-flen**

  Number of seconds in each analysis frame (needs to be greater than twice the longest period you wish to detect - to detect down to 80Hz you need a frame length of 2.0/80 = 0.025).

- **-fshift**

  Frame shift: number of seconds between each analysis frame.

- **-i**

  audio input file

- **-input\_endian**

  of audio data (will be determined automatically if not given)

- **-mswav**

  Defines input format as Microsoft Wav (RIFF)

- **-nist**

  Defines input format as NIST sphere

- **-nskip**

  If a control file was specified, the number of utterances to skip at the head of the file

- **-o**

  text output file (standard output will be used if not given)

- **-raw**

  Defines input format as raw binary data

- **-runlen**

  If a control file was specified, the number of utterances to process (see **-nskip** too)

- **-samprate**

  Sampling rate of audio data (will be determined automatically if 0)

- **-search\_range**

  Fraction of the best local estimate to use as a search range for smoothing.

- **-smooth\_window**

  Number of frames on either side of the current frame to use for smoothing.

- **-voice\_thresh**

  Threshold of normalized difference under which to search for the fundamental period.

## AUTHOR

David Huggins-Daines \<dhuggins@cs.cmu.edu\>

## COPYRIGHT

Copyright © 2007-2008 Carnegie Mellon University.  See the file *COPYING* included with this package for more information.\