|
SCL6
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 recordin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SCL6 (codec)
Master Quality Authenticated (MQA) is a Proprietary software, proprietary system for delivering high-quality digital audio. The system includes audio signal processing, audio compression (data), 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 Master Quality Authenticated#Audio signal processing description, end-to-end digital filter response; 2) preparing the audio for transfer to a smartphone or audio device using a Master Quality Authenticated#Codec description, lossy audio compression format with Master Quality Authenticated#Authentication description, authentication; and 3) Master Quality Authenticated#Codec description, decompressing the recording for playback. There has been controversy regarding several aspects of MQA. These aspects i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lossless Audio
In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original representation. Any particular compression is either lossy or lossless. Lossless compression reduces bits by identifying and eliminating statistical redundancy. No information is lost in lossless compression. Lossy compression reduces bits by removing unnecessary or less important information. Typically, a device that performs data compression is referred to as an encoder, and one that performs the reversal of the process (decompression) as a decoder. The process of reducing the size of a data file is often referred to as data compression. In the context of data transmission, it is called source coding: encoding is done at the source of the data before it is stored or transmitted. Source coding should not be confused with channel coding, for error detection and correction or line coding, the means for mapping data onto a sig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Audio Compression (data)
In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original representation. Any particular compression is either lossy or lossless. Lossless compression reduces bits by identifying and eliminating Redundancy (information theory), statistical redundancy. No information is lost in lossless compression. Lossy compression reduces bits by removing unnecessary or less important information. Typically, a device that performs data compression is referred to as an encoder, and one that performs the reversal of the process (decompression) as a decoder. The process of reducing the size of a data file is often referred to as data compression. In the context of data transmission, it is called source coding: encoding is done at the source of the data before it is stored or transmitted. Source coding should not be confused with channel coding, for error detection and correction or line coding, the means ... [...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] |
LHDC (codec)
Low Latency High-Definition Audio Codec (LHDC) is an audio codec technology developed by Savitech. LHDC allows high-resolution audio streaming over Bluetooth. It is a high-quality Bluetooth codec based on the A2DP Bluetooth protocol and allows a bit-rate of up to 1000 kbps compared to SBC's bit rate of 345 kbps. LHDC is an alternative to Bluetooth SIG's SBC and LC3 codecs. Its main competitors are Qualcomm's aptX-HD/ aptX Adaptive, Huawei 's L2HC and Sony's LDAC codec. Starting from Android 10, enumeration constant symbols for LHDC and LLAC are part of the Android Open Source Project, enabling every OEM to integrate this standard into their own Android devices freely. Older versions of Android require LHDC/LLAC enumeration constant symbols to be implemented by the smartphone manufacturers or Android app. Android apps with this type of LHDC support include Savitech's Hi-Res BT Player, FiiO Music, HIFIMAN Music and DA&T Audio. LHDC LHDC supports bitrates of 16 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LC3 (codec)
LC3 (Low Complexity Communication Codec) is an audio codec specified by the Bluetooth Special Interest Group (SIG) for the LE Audio audio protocol introduced in Bluetooth 5.2. It's developed by Fraunhofer IIS and Ericsson as the successor of the SBC codec. Mono only LC3-SBW is also supported over Bluetooth Classic HFP 1.9, improving on mSBC. It is possible to send 4 LC3 streams to LE audio earbuds, like Samsung's Buds2 Pro. Codec LC3 provides higher audio quality and better packet loss concealment than SBC, G.722 and Opus, according to subjective testing by the Bluetooth Special Interest Group and ETSI. The conclusion regarding Opus is disputed as the test only included speech audio, but the comparison was made to version 1.1.4 of the reference Opus encoder, using complexity level 0 at 32 kbps and relying on CELT (general audio) instead of the FEC-capable SILK (speech); the test also did not take into account the newer version 1.2 of the Opus encoder released in 2017 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lossy
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] |
Open Source
Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use and view the source code, design documents, or content of the product. The open source model is a decentralized software development model that encourages open collaboration. A main principle of Open-source software, open source software development is peer production, with products such as source code, blueprints, and documentation freely available to the public. The open source movement in software began as a response to the limitations of proprietary code. The model is used for projects such as in open source appropriate technology, and open source drug discovery. Open source promotes universal access via an open-source or free license to a product's design or blueprint, and universal redistribution of that design or blueprint. Before the phrase ''open source'' became widely adopted, developers and producers used a variety of other terms, suc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sample Rate
In signal processing, sampling is the reduction of a continuous-time signal to a discrete-time signal. A common example is the conversion of a sound wave to a sequence of "samples". A sample is a value of the signal at a point in time and/or space; this definition differs from the term's usage in statistics, which refers to a set of such values. A sampler is a subsystem or operation that extracts samples from a continuous signal. A theoretical ideal sampler produces samples equivalent to the instantaneous value of the continuous signal at the desired points. The original signal can be reconstructed from a sequence of samples, up to the Nyquist limit, by passing the sequence of samples through a reconstruction filter. Theory Functions of space, time, or any other dimension can be sampled, and similarly in two or more dimensions. For functions that vary with time, let s(t) be a continuous function (or "signal") to be sampled, and let sampling be performed by measuring ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dither
Dither is an intentionally applied form of noise used to randomize quantization error, preventing large-scale patterns such as color banding in images. Dither is routinely used in processing of both digital audio and video data, and is often one of the last stages of mastering audio to a CD. A common use of dither is converting a grayscale image to black and white, so that the density of black dots in the new image approximates the average gray level in the original. Etymology The term ''dither'' was published in books on analog computation and hydraulically controlled guns shortly after World War II. Though he did not use the term ''dither'', the concept of dithering to reduce quantization patterns was first applied by Lawrence G. Roberts in his 1961 MIT master's thesis and 1962 article. By 1964 dither was being used in the modern sense described in this article. The technique was in use at least as early as 1915, though not under the name ''dither''. In digital pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tidal (service)
Tidal (stylized TIDAL) is a Norwegian-American music streaming service, launched in 2014 by the Norwegian-Swedish public company Aspiro. Tidal is now majority-owned by Block, Inc., the owner of the point-of-sale system Square. With distribution agreements with all three major record labels and many independent labels, Tidal claims to provide access to more than 100 million tracks and 650,000 music videos. On April 10, 2024, Tidal merged its two subscription plans to become one simply named Tidal, which offers the same quality as the former HiFi Plus plan (FLAC HiRes 24-bit/192KHz and MQA – 24-bit/352.8 kHz). However, on July 24, 2024, Tidal removed the feature to listen in MQA. Tidal claims to pay the highest percentage of royalties to music artists and songwriters within the music streaming market. In March 2015, Aspiro was acquired by Project Panther Bidco Ltd., which relaunched the service with a mass-marketing campaign, promoting it as the first artist-ow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
