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Topic: ADC (Adaptive Differential Coding) My Experimental Lossy Audio Codec (Read 50062 times) previous topic - next topic
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Re: ADC (Adaptive Differential Coding) My Experimental Lossy Audio Codec

Reply #125 –
ADC codec lossy now Available on Zenodo!

Hello everyone,

I'm excited to announce that my codec ADC , is now available on Zenodo for public access and use!

Zenodo is a reliable open-access repository for scientific publications and software, and I've decided to make the latest version of the project available there. You can download the demo (Max time to process 31 sec. in demo).
You can find it here: https://zenodo.org/records/15333865

Re: ADC (Adaptive Differential Coding) My Experimental Lossy Audio Codec

Reply #126 –
I've been away from the forum for a long time and don't want to sound obsessive. However, I want to point out with great surprise that wavpack option -b2.0 fails to regenerate on second generation as ADC. The test was done with the source of the latest blind test that I put online. You can check it out yourself..


I tried to check if ADC fails but it does not fail this kind of feature. MP4 AAC despite the quality that should be remarkable does not have this feature, it fails on the first generation.

Please let me know if ADC fails on this feature which makes it unique in the world for now.

Re: ADC (Adaptive Differential Coding) My Experimental Lossy Audio Codec

Reply #127 –
Quote from: Nania Francesco on
I've been away from the forum for a long time and don't want to sound obsessive. However, I want to point out with great surprise that wavpack option -b2.0 fails to regenerate on second generation as ADC. The test was done with the source of the latest blind test that I put online. You can check it out yourself..


I tried to check if ADC fails but it does not fail this kind of feature. MP4 AAC despite the quality that should be remarkable does not have this feature, it fails on the first generation.

Please let me know if ADC fails on this feature which makes it unique in the world for now.
@Nania Francesco, I think if you put a MDCT filter like how MP3 and AAC does, it will be more efficient than what is now (which uses a ADPCM-like system).
Instead of sounding great at 192-256 kbps, it will sound great at probably half the bitrate (around 96-128 kbps or slightly more, also not transparent, but not a issue either)

Re: ADC (Adaptive Differential Coding) My Experimental Lossy Audio Codec

Reply #128 –
Quote
@Nania Francesco, I think if you put a MDCT filter like how MP3 and AAC does, it will be more efficient than what is now (which uses a ADPCM-like system).
Instead of sounding great at 192-256 kbps, it will sound great at probably half the bitrate (around 96-128 kbps or slightly more, also not transparent, but not a issue either)

That's exactly what I thought until recently too. In fact I was looking for something more and more precise and small. Then I started to verify that the original sound is better on a system that is not a high-end audiophile one, let's talk about a medium-low level one (I have the legendary Pioneer SA 9500 II that you can find on ebay for 1600 euros today and an Aeron AV2800) and I tell you that the difference is very noticeable on good level speakers (but always under 2000 euros). So I said to myself why not try something different. Where do I start, from the simple ADPCM. I assimilated the concepts in a day. Then I started to experiment. I tried the FFT and the MDCT but I wasn't good, in fact worse and they consumed bitrate to get excellent results. I had to read the code of the frequency domain codecs and I was going crazy with the complexity. So I went back and I'm on ADC.