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High-resolution Audio
High-resolution audio is a term for music files with bit depth greater than 16-bit and sampling frequency higher than 44.1 kHz or 48 kHz used in CD and DVD formats. The Audio Engineering Society (AES), Consumer Technology Association (CTA) and Japan Audio Society (JAS) set 24-bit/96 kHz as the minimum requirement to fulfill the standard. The Recording Academy Producers & Engineers Wing also cites 24-bit/96 kHz as the preferred resolution for tracking, mixing and mastering audio. It is supported by media formats such as DVD-Audio, DualDisc and High Fidelity Pure Audio, download stores like Bandcamp, HDtracks and Qobuz, and streaming platforms including Apple Music, Amazon Music and Tidal. Research into high-resolution audio began in the late 1980s and recordings were made available on the consumer market in 1996. Other bit depth/sample rate combinations that are often marketed as "high-resolution" include 1-bit/2.8224 MHz ( DSD), 20-bit/44.1 kHz ( HDCD), 24-bit/44 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apple Music
Apple Music is an audio and video streaming service developed by Apple Inc. Users can select music to stream to their device on-demand, or listen to existing playlists. The service also includes the sister internet radio stations Apple Music 1, Apple Music Hits, Apple Music Country, Apple Música Uno, Apple Music Club, and Apple Music Chill which are broadcast live to over 200 countries 24 hours a day. The service was announced on June8, 2015, and launched on June30, 2015. New subscribers get a one-month free or six months free trial with the purchase of select products before the service requires a monthly subscription. Originally strictly a music service, Apple Music began expanding into video in 2016. Executive Jimmy Iovine has stated that the intention for the service is to become a "cultural platform", and Apple reportedly wants the service to be a "one-stop shop for pop culture". The company is actively investing heavily in the production and purchasing of video cont ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Recording Industry Association Of America
The Recording Industry Association of America (RIAA) is a trade organization that represents the music recording industry in the United States. Its members consist of record labels and distributors that the RIAA says "create, manufacture, and/or distribute approximately 85% of all legally sold recorded music in the United States". RIAA is headquartered in Washington, D.C. RIAA was formed in 1952. Its original mission was to administer recording copyright fees and problems, work with trade unions, and do research relating to the record industry and government regulations. Early RIAA standards included the RIAA equalization curve, the format of the stereophonic record groove and the dimensions of 33 1/3, 45, and 78 rpm records. RIAA says its current mission includes: #to protect intellectual property rights and the First Amendment rights of artists #to perform research about the music industry #to monitor and review relevant laws, regulations, and policies Between 2001 and 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-resolution Audio
High-resolution audio is a term for music files with bit depth greater than 16-bit and sampling frequency higher than 44.1 kHz or 48 kHz used in CD and DVD formats. The Audio Engineering Society (AES), Consumer Technology Association (CTA) and Japan Audio Society (JAS) set 24-bit/96 kHz as the minimum requirement to fulfill the standard. The Recording Academy Producers & Engineers Wing also cites 24-bit/96 kHz as the preferred resolution for tracking, mixing and mastering audio. It is supported by media formats such as DVD-Audio, DualDisc and High Fidelity Pure Audio, download stores like Bandcamp, HDtracks and Qobuz, and streaming platforms including Apple Music, Amazon Music and Tidal. Research into high-resolution audio began in the late 1980s and recordings were made available on the consumer market in 1996. Other bit depth/sample rate combinations that are often marketed as "high-resolution" include 1-bit/2.8224 MHz ( DSD), 20-bit/44.1 kHz ( HDCD), 24-bit/44 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compact Disc Digital Audio
Compact Disc Digital Audio (CDDA or CD-DA), also known as Digital Audio Compact Disc or simply as Audio CD, is the standard format for audio compact discs. The standard is defined in the '' Red Book'' technical specifications, which is why the format is also dubbed ''"Redbook audio"'' in some contexts. CDDA utilizes pulse-code modulation (PCM) and uses a 44,100 Hz sampling frequency and 16-bit resolution, and was originally specified to store up to 74 minutes of stereo audio per disc. The first commercially available audio CD player, the Sony CDP-101, was released in October 1982 in Japan. The format gained worldwide acceptance in 1983–84, selling more than a million CD players in its first two years, to play 22.5 million discs, before overtaking records and cassette tapes to become the dominant standard for commercial music. Peaking around year 2000, the audio CD contracted over the next decade due to rising popularity and revenue from digital downloading, and duri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lossy Compression
In information technology, lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data discarding to represent the content. These techniques are used to reduce data size for storing, handling, and transmitting content. Higher degrees of approximation create coarser images as more details are removed. This is opposed to lossless data compression (reversible data compression) which does not degrade the data. The amount of data reduction possible using lossy compression is much higher than using lossless techniques. Well-designed lossy compression technology often reduces file sizes significantly before degradation is noticed by the end-user. Even when noticeable by the user, further data reduction may be desirable (e.g., for real-time communication or to reduce transmission times or storage needs). The most widely used lossy compression algorithm is the discrete cosine transform (DCT), first published by N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Master Quality Authenticated
Master Quality Authenticated (MQA) is a proprietary system for delivering high-quality digital audio. The system includes audio signal processing, lossy audio compression and authentication. MQA requires licensing fees to use. The system was launched in 2014 by Meridian Audio, and is now owned by Lenbrook. The MQA system is a three-part process applied to digital audio music recordings consisting of 1) modifying and controlling the end-to-end digital filter response; 2) preparing the audio for transfer to a smartphone or audio device using a lossy audio compression format with authentication; and 3) decompressing the recording for playback. There has been controversy regarding several aspects of MQA. These aspects include but are not limited to whether the audio signal processing improves or degrades the sound quality, whether the lossy audio compression degrades the sound quality, the utility of the authentication function, and the effect of licensing fees on music recordi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dolby Digital Plus
Dolby Digital Plus, also known as Enhanced AC-3 (and commonly abbreviated as DDP, DD+, E-AC-3 or EC-3), is a digital audio compression scheme developed by Dolby Labs for the transport and storage of multi-channel digital audio. It is a successor to Dolby Digital (AC-3), and has a number of improvements over that codec, including support for a wider range of data rates (32 kbit/s to 6144 kbit/s), an increased channel count, and multi-program support (via substreams), as well as additional tools (algorithms) for representing compressed data and counteracting artifacts. Whereas Dolby Digital (AC-3) supports up to five full-bandwidth audio channels at a maximum bitrate of 640 kbit/s, E-AC-3 supports up to 15 full-bandwidth audio channels at a maximum bitrate of 6.144 Mbit/s. The full set of technical specifications for E-AC-3 (and AC-3) are standardized and published in Annex E of ATSC A/52:2012, as well as Annex E of ETSI TS 102 366. Technical details Specif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LDAC (codec)
LDAC (Lossless Digital Audio Codec) is a proprietary software, proprietary audio codec, audio coding technology developed by Sony, which allows streaming Lossy compression, lossy audio over Bluetooth connections at up to 990 kbps at 32 bits/96 kHz. Despite this, Sony markets LDAC as "lossless" and "high-resolution," declaring the quality to be better than true lossless, high-resolution audio. It is used by various products, including headphones, earphones, smartphones, portable media players, active speakers, and home theaters. The encoder of LDAC is open-source under Apache License 2.0, so that any device can be coded to transmit LDAC streams without patent or licensing issues. The decoder design remains proprietary. Audio coding LDAC is an alternative to Bluetooth Special Interest Group, Bluetooth SIG's SBC (codec), SBC codec. Its main competitors are Huawei's L2HC, Qualcomm's AptX#aptX HD, aptX-HD/AptX#aptX Adaptive, aptX Adaptive and the HWA Union/Savitech's LHDC (codec) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital-to-analog Converter
In electronics, a digital-to-analog converter (DAC, D/A, D2A, or D-to-A) is a system that converts a digital signal into an analog signal. An analog-to-digital converter (ADC) performs the reverse function. DACs are commonly used in music players to convert digital data streams into analog audio signals. They are also used in televisions and mobile phones to convert digital video data into analog video signals. These two applications use DACs at opposite ends of the frequency/resolution trade-off. The audio DAC is a low-frequency, high-resolution type while the video DAC is a high-frequency low- to medium-resolution type. There are several DAC architectures; the suitability of a DAC for a particular application is determined by figures of merit including: resolution, maximum sampling frequency and others. Digital-to-analog conversion can degrade a signal, so a DAC should be specified that has insignificant errors in terms of the application. Due to the complexity ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital EXtreme Definition
Digital eXtreme Definition (DXD) is a digital audio format that originally was developed by Philips and Merging Technologies for editing high-resolution recordings recorded in Direct Stream Digital (DSD), the audio standard used on Super Audio CD (SACD). As the 1-bit DSD format used on SACD is not suitable for editing, alternative formats such as DXD or DSD-Wide must be used during the mastering stage. In contrast with DSD-Wide or DSD Pure which offers level, EQ, and crossfade edits at the DSD sample rate (64fs, 2.822 MHz), DXD is a PCM signal with 24-bit resolution (8 bits more than the 16 bits used for Red Book CD) sampled at 352.8 kHz – eight times 44.1 kHz, the sampling frequency of Red Book CD. The data rate is 8.4672 Mbit/s per channel – three times that of DSD64. DXD also utilizes the vast array of plugins also available to PCM-based digital audio workstations, such as Cubase, Logic Studio, Digital Performer Digital Performer is a digital aud ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High Definition Compatible Digital
High Definition Compatible Digital (HDCD) is a proprietary audio encode-decode process that claims to provide increased dynamic range over that of standard Compact Disc Digital Audio, while retaining backward compatibility with existing compact disc players. Originally developed by Pacific Microsonics, the first HDCD-enabled CD was released in 1995. In 2000, the technology was purchased by Microsoft, and the following year, there were over 5,000 HDCD titles available. Microsoft's HDCD official website was discontinued in 2005; by 2008, the number of available titles had declined to around 4,000. A number of CD and DVD players include HDCD decoding, and versions 9 and above of Microsoft's Windows Media Player on personal computers are capable of decoding HDCD. HDCD is a favorite among artists who have a preference for high quality sound, such as Neil Young, the Beach Boys and the Grateful Dead—all of whom have multiple CD titles (new and archival) in their catalogs mastered i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
