> For the complete documentation index, see [llms.txt](https://liri-resources-hub.gitbook.io/svt/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://liri-resources-hub.gitbook.io/svt/home-page-speech-and-voice-tools.md). # Home Page: Speech & Voice Tools Welcome to page of Speech & Voice Tools, here the catalogue efficiently lists the Praat scripts and plugins created by [Prof. Volker Dellwo](https://www.cl.uzh.ch/de/about-us/people/team/phonetics/vdellw.html). This page is published and accessed from [LiRI Resource Hub](https://www.liri.uzh.ch/en/resources-hub.html). You can quickly find the tools you need in the **catalogue** below, go to its **dedicated page for more information**, and download it in the corresponding GitHub repository. If you have potential improvement and bug fixes, please refer to the [contribution guide](/svt/general-info/contribution.md). Some of the Praat plugins come with an intuitive tutorial video from our [YouTube channel](https://www.youtube.com/@liri-uzh), be sure to check it out đŸ˜‰! ## Tool Catalogue ### Praat Demonstration Script snippets for demonstration on phonetics research and signal processing. Download on [GitHub](https://github.com/liri-uzh/svt/tree/main/praat_demonstrations). | Tool | Description | | ----------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------- | | demo\_amplitudeModulation | Using a carrier signal to modulate a message signal. | | demo\_convolution | Provides few waveforms frequently used for demonstrating convolution. | | demo\_damping | Graphical demonstration of damping effect. | | demo\_HappyPhonetician | Christmas gift. | | demo\_harmonicDistortion | Graphical demonstration on effects of harmonic distortion on different types of signal. | | demo\_HNRinBeatingSounds | Demonstrates how varying tone frequency affects harmonic quality by measuring the HNR of combined tones. | | demo\_pulseTrain | Demonstrates changes in HNR when combining a fixed 200 Hz tone with another varying from 200 Hz to 300 Hz. | | demo\_quantisation | Graphical demonstration on quantisation levels. | | demo\_requantiseSpeech | Simulates a change of the number of quantisation levels. | | demo\_SourceFilterSynthesiser | Graphical demonstration on the source-filter model. Easy to play around different formants. | | demo\_uncertaintyPrinciple | Interactive exploration of how changes in amplitude, type, and viewing ranges affect a sound’s waveform and spectrum, illustrating the uncertainty principle. | | rhythmCreator | Creates series of rhythmic clicks that vary in rhythm and rate. | ### Praat Signal Analysis Some utility scripts that could be useful in signal analysis with Praat. Download them on [GitHub](https://github.com/liri-uzh/svt/tree/main/praat_signal_analysis). | Tool | Description | | --------------------------- | ----------------------------------------------------------------------------------------------- | | function\_getPeakRate | Speech rate measurement by calculating the number of amplitude envelope peak points per second. | | function\_measureSpeechRate | Speech rate measurement by calculating the number of amplitude envelope peak points per second. | ### Praat Signal Processing Some utility scripts that could be useful in signal processing and analysis with Praat. Download them on [GitHub](https://github.com/liri-uzh/svt/tree/main/praat_signal_processing). | Tool | Description | | --------------------------------- | --------------------------------------------------------------------------------------------------------------------- | | addBabbleNoise | Adds a bubble noise (a given file) to the selected sound object. | | function\_addSounds | Simply adds two or more sounds. | | function\_addWhiteNoise | Adds white noise. | | function\_AM | Applies amplitude modulation to a sound. | | function\_averageIntensities | Applies the mean intensity of a number of selected sound objets to each of the selected sound objects. | | function\_chimerize | Exchanges the envelopes between two sounds. | | function\_create\_P2P\_tier | Creates a TextGrid containing peak-to-peak intervals. | | function\_createAverageSignal | Produces an average of a number of selected sounds. | | function\_createIsochronousSpeech | Creates speech with isochronous intervals based on any labelled tier. | | function\_docover | Removes the amplitude envelope of a signal and maintains the signal temporal fine-structure only. | | function\_durationalMorphing | Applies temporal manipulations to speech sounds. | | function\_FM | turns a sound into a frequency modulated (FM) sound with a carrier frequency specified by the user. | | function\_hilbert | Splits a sound at fixed duration and inserts silences of a fixed duration between each speech interval. | | function\_normalizeIntensity | Normalises the intensity of a speech sound disregarding silences. | | function\_rotatePitch | Rotates the pitch contour around its average. | | function\_rotateSpectralBands | Shifts a spectral band based on amplitude modulation technique. | | function\_sinewaveSpeech | Generates sine-wave speech (SWS) by synthesising up to three sine waves based on the formant frequencies. | | function\_speechCompression | Produces speech that is infinitely peaked clipped (ipc) and reapplies the amplitude envelope (env) to the ipc signal. | | function\_vocoder | Voice vocoder. | | function\_voiceSplitter | Splits stereo sound. | | stack\_normalizeIntensity | Sets the intensity of specified time interval of a sound file. | ### Praat Signals Frequently used signal, easily created with a simple script. Download them on [GitHub](https://github.com/liri-uzh/svt/tree/main/praat_signals). | Tool | Description | | ------------------------- | ----------------------------------------------------------------------- | | demo\_createModulatedTone | Creates a sinusoidally amplitude modulated (SAM) tone. | | demo\_createSawtooth | Creates a sawtooth wave. | | demo\_createSignalInNoise | Generates a sound composed of a pure tone combined with filtered noise. | | demo\_createSinewave | Creates sine wave and visualise the quantisation noise. | ### Praat Statistics This category is some tools useful for plotting and processing Table object. Download them on [GitHub](https://github.com/liri-uzh/svt/tree/main/praat_statistics). | Tool | Description | | ---------------------------------- | ------------------------------------------------------------------------------------- | | demo\_MDSexample | Example of MDS visualisation with Shepard diagram. | | function\_drawBarPlot | Creates a bar plot of a Table. | | function\_drawRegressionLine | Draws a regression line for a Table. | | function\_getZscoret | calculates z-scores for a specified variable in a Table. | | function\_reportConfidenceInterval | returns the confidence interval of a data column in a Table, based on t-distribution. | ### Praat Tools Praat plugins frequently used in phonetics research with Praat. Detailed description and short tutorial video are in their dedicated pages. Or directly download them on [GitHub](https://github.com/liri-uzh/svt/tree/main/praat_tools). | Tool | Description | | ------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------- | | [PresenterPro](/svt/tool-catalogue/praat-tools/plugin-presenterpro.md) | Prompting the reader to read from a screen, indexing the recordings in a Praat TextGrid, and extracting the recordings into individual files very easily. | | [DatabaseExplorer](/svt/tool-catalogue/praat-tools/plugin-databaseexplorer.md) | Simply loop through a number of files in a directory and carry out simple edits. |