CMUSphinx4 SR (legacy)

Speech recognizer based on the CMUSphinx project. Additional language models can be downloaded from Sourceforge and Voxforge. You can also learn your own dictionary and language model and reuse the standard English acoustic model. To automatically create a dictionary and language model file from smaller text files simply go to CMU lmtool page. For more details see the CMU Building Language Model tutorial. Once created you can use your dictionary and language model with an existing acoustic model e.g. en-us.

Notice: If you get bad results check that the sampling rate of your audio files match the one used to train the language model (see CMUSphinx FAQ). The included models where trained with a sampling rate of 16kHz.

Options

Audio Column
The audio column to process
Fail on error
The node fails when an error occurs during processing. If input has multiple AudioFiles, setting "Fail on Error" results in the Node failing when Speech Recognition of one one more AudioFiles fails. If not set, the Node will complete with missing values for all SR columns of the failed AudioFiles.
Audio Model
Build in audio models. Please notice that the included models where trained with a sampling rate of 16kHz.
Selected acoustic model directory
The acoustic model to use. Supports KNIME protocol e.g. knime://knime.workflow/data/acoustic
Selected dictionary file
The dictionary file to use. Supports KNIME protocol e.g. knime://knime.workflow/data/knime.dict
Selected language model file
The language model to use. Supports KNIME protocol e.g. knime://knime.workflow/data/knime.lm

Input Ports

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Table with audio column

Output Ports

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Audio table with recognition result

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Installation

To use this node in KNIME, install the extension KNIME Audio Processing from the below update site following our NodePit Product and Node Installation Guide:

v5.9

A zipped version of the software site can be downloaded here.

Plugin provider: KNIME AG, Zurich, Switzerland
Plugin version: 5.9.0.v202511130853
On NodePit since: 2025-12-11
Last update: 2026-01-22
Tags: Streamable
KNIME versions: Since v3.6

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