GTCRN

This repository is the official implementation of the ICASSP2024 paper: GTCRN: A Speech Enhancement Model Requiring Ultralow Computational Resources.

Audio examples are available at Audio examples of GTCRN.

🔥 News

• [2026-1-18] Added a LADSPA plugin for filtering live audio on Linux using pipewire. Please note that LADSPA support is experimental and currently maintained by community contributor Bruno Gonçalves.
• [2025-5-27] A lightweight hybrid dual-channel SE system adapted for low-SNR conditions is released in H-GTCRN.
• [2025-3-13] A quick inference web is built thanks to Fangjun Kuang, see in web.
• [2025-3-10] Now GTCRN is supported by sherpa-onnx thanks to Fangjun Kuang, see here.
• [2025-3-05] An improved ultra-lightweight SE model named UL-UNAS is proposed, see in repo and arxiv.

About GTCRN

Grouped Temporal Convolutional Recurrent Network (GTCRN) is a speech enhancement model requiring ultralow computational resources, featuring only 48.2 K parameters and 33.0 MMACs per second. Experimental results show that our proposed model not only surpasses RNNoise, a typical lightweight model with similar computational burden, but also achieves competitive performance when compared to recent baseline models with significantly higher computational resources requirements.

Note:

• The complexity reported in the paper is 23.7K parameters and 39.6 MMACs per second; however, we update these values to 48.2K parameters and 33.0 MMACs per second here. This modification is due to the inclusion of the ERB module. When accounting for the parameters of the ERB module (even though they are unlearnable), the parameter count increases to 48.2K. By replacing the invariant mapping from linear bands to ERB bands in the low-frequency dimension with simple concatenation instead of matrix multiplication, the MACs per second are reduced to 33 MMACs.
• The explicit feature rearrangement layer in the grouped RNN, which is implemented by feature shuffle, can result in an unstreamable model. Therefore, we discard it and implicitly achieve feature rearrangement through the following FC layer in the DPGRNN.

Performance

Experiments show that GTCRN not only outperforms RNNoise by a substantial margin on the VCTK-DEMAND and DNS3 dataset, but also achieves competitive performance compared to several baseline models with significantly higher computational overhead.

Table 1: Performance on VCTK-DEMAND test set

Table 2: Performance on DNS3 blind test set.

Pre-trained Models

Pre-trained models are provided in checkpoints folder, which were trained on DNS3 and VCTK-DEMAND datasets, respectively.

The inference procedure is presented in infer.py.

Streaming Inference

A streaming GTCRN is provided in stream folder, which demonstrates an impressive real-time factor (RTF) of 0.07 on the 12th Gen Intel(R) Core(TM) i5-12400 CPU @ 2.50 GHz.

Related Repositories

SEtrain: A training code template for DNN-based speech enhancement.

TRT-SE: An example of how to convert a speech enhancement model into a streaming format and deploy it using ONNX or TensorRT.