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This is pure free hyper-quality resampler, re-quantizer, and having high-freq predictor effect.

This project aims to replace Saracon-level audio quality resampler with a free alternative.
This resampler and re-quantizer consists of the following algorithms:

• Resampler Section: The audio is divided into overlapped chunks, and linear phase and minimum phase filters are selectively used for fine frequency bands, primarily 128 bands on the mel scale.
  All possible choices are tested to minimize the difference after resampling based on overall noise tonality, gain, and band information. The method judged to be optimal is used for each respective band.
• Re-quantizer Section: The audio is divided into overlapped chunks, frequency distribution is analyzed, and shaping coefficients are designed to place noise in areas where it cannot be heard, then noise shaping is performed based on these coefficients. HFE (High Frequency Enhancement) function is still under development.

※This project utilizes LLM technology.

Git: https://github.com/Super-YH/sradcon#readme
Latest (linux) release: https://github.com/Super-YH/sradcon/releases/latest
Developer: Super-YH

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DSRE / Deep Sound Resolution Enhancer
...it's in beta stage and executable has chinese GUI only:

Description:
DSRE is a high-performance audio enhancement tool that can batch-convert any audio files into high-resolution (Hi-Res) audio. Inspired by Sony DSEE HX, it uses a non-deep-learning frequency enhancement algorithm, allowing fast processing of large batches without heavy computation.

Key Features:

• Batch Processing: Convert multiple audio files at once.
• Multiple Formats：Supports WAV, MP3, FLAC, M4A, etc.
• Preserves Cover & Metadata：No manual editing required.
• Flexible Parameters：Modulation count, decay, high-pass filter, etc.
• Fast & Stable：Does not rely on deep learning, fast processing.

Git: https://github.com/x1aoqv/DSRE---Digital-Sound-Resolution-Enhancer#readme
License: MIT
Latest release: https://github.com/x1aoqv/DSRE---Digital-Sound-Resolution-Enhancer/releases/latest

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caudec is a BASH script for macOS and Linux that can transcode supported audio files using multiple CPU cores, as well as resample and / or downmix to stereo if needed. ReplayGain is supported for certain codecs only (see README.md and HELP.md).

https://github.com/gcocatre/caudec

Here's a 10+ years refresh of caudec to reflect advances in certain codecs, as well as my own usage and setup. I have:

• removed:
  • old software and Windows or Linux only software: TAK, Flake, Musepack, qaac, WaveGain, Nero AAC stuff (encoder, decoder, tagger)
  • the creation of ramdisks, because internal and external SSDs are more than fast enough these days
  • the ability to delete source files (too dangerous)
  • testing the integrity of files using hashes previously computed by caudec (internal codec testing, still available, is enough)
• fixed a lot of bugs
• added some features:
  
  • multi-threading for FLAC, WavPack and Monkey's Audio
  • ReplayGain for Opus
  • hard linking lossy WavPack Hybrid .wv files into their own root directory
  • "touching" files by setting their date/time using audio metadata and duration
  • embedding user-specified artwork into FLAC, anything APEv2, MP3, Opus, m4a (AAC / ALAC)
  • copying non-audio files to the destination directory (all, lists of files and or lists of file extensions)
  • setting default destination directories (default, lossless, lossy) in the configuration file

Please note that I have not touched the Linux specific parts and I have not yet tested the new version on Linux, as I have been using macOS since the last 2014 update (version 1.7.6).

I have reached a state where I feel confident enough to publish the new version. However, more testing needs to be done. Use at your own risk. Make sure you have a backup of your music collection stored somewhere safe.

Comments, remarks, questions, are most welcome.