{"id":3431,"date":"2021-03-15T18:50:32","date_gmt":"2021-03-15T18:50:32","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=3431"},"modified":"2021-03-15T18:50:32","modified_gmt":"2021-03-15T18:50:32","slug":"choosing-the-best-format-to-compress-audio-data-mp3-aac-or-wavpack-part-2","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/choosing-the-best-format-to-compress-audio-data-mp3-aac-or-wavpack-part-2\/","title":{"rendered":"Choosing the best format to compress audio data: MP3, AAC or WavPack? Part 2"},"content":{"rendered":"

Choosing the best format to compress audio data: MP3, AAC or WavPack? Part 2<\/strong><\/p>\n

\"Audio<\/p>\n

The square wave after conversion to AAC retains its shape, although base distortion and harmonics around the 1 kHz peak also occurred, albeit less noticeably than in MP3.<\/p>\n

\"Music<\/p>\n

At the same time, the AAC demonstrates a 1 dB higher measured noise level. What would that mean, an intermediate recording on a cassette, or what? No, the AAC algorithm sure uses something like noise shaping, a great invention that allows you to reduce quantization errors when mixing a pseudo-random noise signal. Again, this isn’t just about drowning out the distortion below the noise floor; more sophisticated math is applied here.<\/p>\n

To illustrate, let’s look at the artifacts around the so-called 11.025 kHz jitter test. Why this particular frequency? Because the multiple harmonic of this peak falls exactly on the upper limit of the spectrum of the 44 kHz sampled digital stream, and all the rest will be outside of it. Small spurious peaks, especially those that are symmetrical with respect to pitch (modulation products, “sidebands”) – these are the grains of fluctuation.<\/p>\n

Stability in AAC (top) and MP3 (bottom) jitter testing<\/p>\n

As you can see, Fool-MP3 saved a low noise level, but generated more high frequency fluctuations (more perceptible to the ear), and AAC increased the noise a bit, but avoided clutter in the rest of the spectrum. But the WavPack encoder does even bigger tricks with noise shaping.<\/p>\n

WavPack: keep frequency, change bit width
\nIn general, if it is immediate and very short, then the WavPack encoder math today belongs to the most flexible and cool protocols for audio enthusiasts, no joke. Unlike FLAC, it can support 32-bit computation (I recommended it for creating lossless vinyl rips). Also, in WavPack you can even package a DSD file without converting it to PCM. In this case, the size of said file will be much smaller than the original dsf. But we will talk about lossless WavPack later, but for now we will consider the unique working principle of lossy WavPack codec.<\/p>\n

In one of my reviews, I showed that in several cases, when compressing at a loss, it makes sense to reduce not the sample rate, but directly the bit depth of the signal (i.e. below 24 or 16 bits), carefully mixing the dither (that is, a special noise profile to reduce quantization errors). WavPack went in exactly this glorious way, without touching on discretion and frequency in general, but changing the bit depth, which is now a dynamic value, describing the loudness level of the signal. A bit like the DSD principle, right?<\/p>\n

It is noteworthy that when converting to a lossy WavPack, you can also save a parallel “correction” file, with which you can fully restore the original, down to the last bit. However, in this case, you will not be able to save disk space, since the size of that pair will still correspond to the original without loss. However, the functionality of the protocol is still impressive.<\/p>\n

The bitrate of our test file was set at 320kb \/ s to compare it to the maximum of our MP3 and AAC, but theoretically it can be set higher in WavPack. This is especially useful for highs, I’ll show you how later, and MQA is no longer needed!<\/p>\n

Harmonic distortion comparison of original (green) and lossy WavPack encoded file (white). The noise level has increased slightly and there is almost no distortion.<\/p>\n

In the graphics, the lossy WavPack demonstrates the commendable lack of a harmonic fence that the previous two encoders had run into due to the aggressive psychoacoustic model. There are no such nifty algorithms in WavPack, nor are there any frequency response filters; only dynamic signal level weighting works for a given bitrate, and that’s it. As a result, the 1 kHz test gives only a few odd-order harmonics: 3rd, 7th, 9th, and so on. The frequency range is preserved, also the square wave. In the 11 kHz jitter test, in the rest of the spectrum, except for the increase in noise, no parasitic activity was observed.<\/p>\n

In jitter test with 11025 Hz tone, lossy WavPack is all clear<\/p>\n

For the listening experience, I have selected a couple of fairly loud and well written phonograms, which you can also download and listen to in three lossy encoding variations with a 320 kb \/ s bit rate: MP3, AAC and WavPack. In the same place, in these two files, the standard CD FLAC originals with 16 bit \/ 44 kHz resolution will be attached.<\/p>\n","protected":false},"excerpt":{"rendered":"

Choosing the best format to compress audio data: MP3, AAC or WavPack? Part 2 The square wave after conversion to AAC retains its shape, although base distortion and harmonics around the 1 kHz peak also occurred, albeit less noticeably than in MP3. At the same time, the AAC demonstrates a 1 dB higher measured noise … Continue reading “Choosing the best format to compress audio data: MP3, AAC or WavPack? Part 2”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[31187,37900,59594,28916,31233,6820,28910,6823,6822,6824,34525,22462,22463,6831,28917,6832,6830,30538,55489,6833,7040,6839,6834,6843,61231,31254,31258,50539,34527,61230,31255,31253],"class_list":["post-3431","post","type-post","status-publish","format-standard","hentry","category-audio-video","tag-audio-container-format","tag-audio-format-was-developed-by-microsoft","tag-can-you-convert-audio-format","tag-does-youtube-accept-audio-formats","tag-how-audio-formats-convert","tag-what-are-audio-formats","tag-what-are-common-audio-formats","tag-what-are-different-audio-formats","tag-what-are-lossless-audio-formats","tag-what-are-uncompressed-audio-formats","tag-what-audio-formats-can-be-used-in-powerpoint","tag-what-audio-formats-does-arc-support","tag-what-audio-formats-does-imovie-support","tag-what-audio-formats-does-itunes-support","tag-what-audio-formats-does-lightworks-support","tag-what-audio-formats-does-netflix-support","tag-what-audio-formats-does-optical-support","tag-what-audio-formats-does-plex-support","tag-what-audio-formats-does-ps5-support","tag-what-audio-formats-does-sonos-support","tag-what-audio-formats-does-youtube-accept","tag-what-is-audio-coding-formats","tag-what-is-audio-formats","tag-where-is-audio-coding-formats","tag-which-audio-format-for-ps5","tag-which-audio-format-is-best","tag-which-audio-format-is-best-for-call-recording","tag-which-audio-format-is-best-for-recording","tag-which-audio-format-is-best-for-youtube","tag-which-audio-format-is-best-ps5","tag-which-audio-format-is-the-most-popular-today","tag-which-audio-format-is-used-to-create-chiptunes"],"yoast_head":"\nChoosing the best format to compress audio data: MP3, AAC or WavPack? 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