It simply accesses the ensemble of multimedia data available on devices connected to the same network, in the same place and in real time.Ĭhromecast is a protocol and hardware solution developed by Google, which functions as a multimedia data exchange device. The protocol used for this guarantee of automatic functioning is UPnP (Universal Plug and Play). It is tasked with guaranteeing the automatic functioning of its devices under the same operating system. To read audio files, Bluetooth uses various codecs which reduce the quality of transmitted files.ĭLNA, Digital Living Network Alliance, is an association which brings together many manufacturers. For smartphone streaming, most platforms offer an MP3 format with a maximum bitrate of 320 Kb/s.īluetooth is a wireless communication exchange standard between two devices. A fiber connection would therefore be preferable. For Hi-Res sound streaming at a bitrate of 9.2 Mb/s, it is clear that you can quickly reach the ADSL limit. With a theoretical maximum bitrate of 13 Mb/s, an ADSL is adequate for CD quality streaming (at 1.411 Mb/s). In the case of streaming, the size and therefore the quality of the files should be chosen depending on the bitrate of internet available. An hour of music in Hi-Res 24-Bit / 192 kHz takes up 2GB whereas 635MB are required to store the same amount in CD quality. The higher the bitrate, the bigger the sizes of the files generated. The use of different audio qualities generates files with extremely varied sizes. 24-Bit resolution promises a dynamic range of 144dB and therefore an optimal listening experience for a lossless converted audio product. For example, Hi-Res sound uses 24-Bit resolution with a sampling frequency ranging between 44.1 and 192 kHz. To reproduce a sound with maximum fidelity, ensuring its resolution is important. The quality of an audio product is often defined by its bitrate and therefore by its resolution. Immediately it’s clear that there is a massive difference between a CD’s bitrate of 1.411 Mb/s and an MP3 encoded at 192 Kb/s. We therefore get a bitrate equal to 44,100 x 16 x 2 = 1,411,200 bits per second: the bitrate of a CD is equal to 1.411 Mb/s. For CDs: 44,100 samples per second, each one sampled over 16-Bit, everything over two channels (left-right stereo). It is measured in bits per second and is calculated fairly easily. The Bitrate, the flow of binary data, expresses the speed of information per second. This affects the precision with which the sound is reproduced: the higher the sampling rate, the more natural and precise the sound reproduction will be. For a CD, the sampling rate used is 44.1 kHz, meaning that each second of sound, when converted, is divided into 44,100 samples. Sampling rate corresponds to the number of samples per second. For a CD, each sample has a resolution of 16-Bit its dynamic range is expressed over a range of 96 dB (decibels), with 1 bit corresponding to 6 dB. The difference in richness of sound and feeling is very substantial compared to MP3 files or even CD quality. This is also called studio quality because 24-Bit resolution is used in a recording studio. These files are encoded with 24-Bit resolution (as opposed to 16-Bit for CD quality). Hi-Res Audio is dedicated to audio files that deliver sound with a quality superior to that of a CD. On Qobuz, the CD quality files are available in FLAC, a lossless compression format which reduces the size of the files without altering their original quality. Digitally, CD quality corresponds to a specification which has a format equivalent to that of the original file: 16-Bit / 44.1kHz. This corresponds to the sound quality similar to that of a Compact Disc which you would listen to on a CD player. The MP3 notably allows for a file size considerably smaller than that of a CD file, hence its mass use in the streaming industry. The bit rate of 320kbps corresponds to the number of bits per second, in this instance 320,000. It is a destructive format which greatly alters the sound quality. The MP3 file is a lossy audio compression format.
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