I want to measure the voice frequency in Hz. Is there any open source or tool available in Ubuntu?
This list is by no means exhaustive:
Spek - helps to analyse your audio files by showing their spectrogram. Perhaps the easiest for novice users and available from the Software Centre.
Audacity - the reference audio editor for Linux, but with a complex user interface; also available from the Software Centre.
JAAA - audio signal generator and spectrum analyser designed to make accurate measurements; available from the Software Centre.
Spectrum3d - an audio spectrum analyser in 3D for Linux; works in real time from the mic or in non-real time from an audio file.
Toscanalyzer - among many other features: frequency band analysis on 4 bands and sub-band; frequency band distribution in stereo space; representation of spectrum with frequency and tonal scaling.
SoundRuler - a tool for measuring and graphing sound and for teaching acoustics.
Spectrum Analyzer - an oldie programmed for DOS that is supposed to run on Wine.
A lightweight application which does just this is
Note: when you run lingot from within your Ubuntu desktop environment, set the audio device to