node-red-contrib-wav-stft

A Node-RED node to decode audio in WAV format and perform short-term Fourier transform (STFT). It computes the STFT based on the Window Size and Stride Size settings. The audio WAV should come in as Buffer data type from previous node. Here are the processing procedures:

• Slice the whole audio into fix duration segments according to the Window Size value. The Stride Size decides the interval between adjacent segments.
• Compute the STFT and frequency bins is 161
• Insert a size 1 rank as the first rank and last rank

Installation

Prerequisite

For Tensorflow.js on Node.js (@tensorflow/tfjs-node or @tensorflow/tfjs-node-gpu), it depends on Tensorflow shared libraries. Putting Tensorflow.js as the dependency of custom Node-RED node may run into a situation that multiple custom nodes install multiple tfjs-node module as their dependencies. While loading multiple Tensorflow shared libraries in the same process, the process would abord by hitting protobuf assertion.

Therefore, this module put @tensorflow/tfjs-node as peer dependency. You need to install it with the Node-RED manully.

Install @tensorflow/tfjs-node:

npm install @tensorflow/tfjs-node

Install this module:

Once you install the peer dependency, you can install this module:

npm install node-red-contrib-wav-stft