By Michael Fay • January 8, 2019 Case For Lossy Formats, Sidebar 1 Per the Library of Congress Sustainability of Digital Formats website. MP3 is the common name for MPEG Layer III audio encoding, and is defined in two ISO/IEC specification families (MPEG-1: 11172-3 and MPEG-2: 13818-3). MP3 compression employs perceptual coding, an approach based on psychoacoustic models that permit the codec to discard or reduce the precision of audio components that are less audible to human hearing. The three classes of audio compression associated with MPEG-1 and -2 specifications are known as Layers I, II, and III; MP3 is shorthand for Layer III. Each higher level designation increases the trade-off between increased syntax and coding complexity, and improved coding efficiency. An MP3 file created with a bitrate of 128 kbit/s is about 1/11 the size of an uncompressed Linear Pulse Code Modulated (LPCM) file at compact disk levels of quality (44.1 kHz, 16 bits deep). An MP3 file can also be recorded at higher or lower bitrates, with higher or lower resulting quality. Case For Lossy Formats, Sidebar 2 Reference Track Sampler Night Winds – Randy Dorman and Rick Harper Calling Elvis — Mark Knopfler and Dire Straits Some People — LeAnn Rimes Can’t Find the Words – Kim Richey Pop Culture – Thomas Dolby I Will Remember — Toto Poquito Mas – Infected Mushroom Capricorn — 30 Seconds To Mars You can find the full list of my favorite tracks here — look for the MF SysTune link. I keep most of these tracks handy on various storage media and on one small, portable device. I have a tiny thumb drive on my key ring and a number of compilation CDs, but my favorite is a FiiO X1, high-resolution, lossless music player. This device is compatible with the lossless and lossy file types listed below, and unlike phones, tablets and most computers that use headphone outputs, it has a dedicated line-level output with excellent specs. FiiO File Formats Supported Lossless APE (Fast): 192 kHz / 24 bit APE (Normal): 96 kHz / 24 bit APE (High): 96 kHz / 24 bit FLAC: 192 kHz / 24 bit WAV: 192 kHz / 32 bit AIFF: 192 kHz / 32 bit AIF:192 kHz / 24 bit WMA Lossless: 48 kHz / 24 bit (to be supported by future update) Apple Lossless: 192 kHz / 24 bit Lossy Compression MP3, AAC, WMA, OGG FiiO Output Specs THD + N ≤ 0.003% (1 kHz) Frequency Response 5 Hz to 60 kHz Crosstalk ≥101 dB (10 kOhms / 1 kHz) Signal to Noise Ratio (SNR) ≥ 115 dBA Dynamic Range ≥ 107 dB Line Output Level 1.7 Vrms (10 kOhms / 1 kHz) Read the rest of this post 1 2 3 4 About Michael Michael Fay Michael Fay is owner/principal at GraceNote Design Studio, an audio, video and acoustic design consultancy; a sustaining member and graduate of multiple SynAudCon workshops; a member of AVIXA and the Acoustical Society of America; an SDVoE Design Partner; former Integration Division general manager and senior design consultant with Sound Image; and former editor of Recording Engineer/Producer magazine. https://www.gracenoteds.com/ Tagged with: Audio Basics Michael Fay MP3 Music Formats · all topics Subscribe to Live Sound International Subscribe to Live Sound International magazine. Stay up-to-date, get the latest pro audio news, products and resources each month with Live Sound.