Уровень 0 · материалов: 3
В кластер входят документы, посвященные техническим аспектам кодирования, сжатия и верификации качества цифровых аудиозаписей, но не входят документы об индивидуальном психоакустическом восприятии звуковых иллюзий.
Общие признаки: форматы аудиофайлов, потери качества при сжатии, сравнение lossless и lossy аудио, влияние битрейта на восприятие
Группа выше: Цифровой звук, кодеки и форматы
Смысл: The main idea is to empirically verify the proportion of actual lossless (FLAC) tracks in Yandex Music's library through database analysis, concluding that while many tracks are labeled as high quality, a significant portion uses high-bitrate AAC instead of true lossless audio.
An IT enthusiast reverse-engineered the Yandex Music Android app's database to find that only 27% of his 'lossless' tracks are actually FLAC, with most being 256kbps AAC.
Смысл: Apple is using its dominant market position in digital music to pressure record labels to provide 24-bit high-resolution audio, aiming to end the era of sound degradation caused by the CD and MP3 standards.
Apple is negotiating with music labels to upgrade digital music from 16-bit to 24-bit audio to restore high-fidelity sound for the general public.
Смысл: The main idea is to demonstrate the sonic loss occurring during MP3 compression using a phase-cancellation experiment, proving that while differences exist, their perceptibility depends on the bitrate and playback equipment.
The author uses phase inversion to isolate and let users hear the specific audio data lost when converting FLAC files to 128 and 320 kbps MP3s.