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The Empeg Car was one of the first in-car MP3 players developed. Originating in a personal project to build an in-car system that could perform MP3 playback in software, a British company called Empeg was formed in July 1998 to build a commercial version of the concept, [ 1 ] this becoming available for sale in August 1999.
A car cassette adapter allowed motorists to plug in a portable music player (CD player, MP3 player) into an existing installed cassette tape deck. [25] In the early 21st century, compact digital storage media – Bluetooth-enabled devices, thumb drives, memory cards, and dedicated hard drives – came to be accommodated by vehicle audio systems.
Some MP3 players can encode directly to MP3 or other digital audio formats directly from a line-level audio signal (radio, voice, etc.). [ citation needed ] Devices such as CD players can be connected to the MP3 player (using the USB port) in order to directly play music from the memory of the player without the use of a computer.
Devices can be operated by connecting to the audio source or to a proprietary port of a specific device it is made for. In addition, certain devices such as hands-free car kits, navigation tools such as the TomTom GO, mobile phones like some Nokia Nseries models, and MP3 players may have FM transmitters built-in, however this has become uncommon.
Audacious is a free and open-source audio player software with a focus on low resource use, high audio quality, and support for a wide range of audio formats. [6] It is designed primarily for use on POSIX-compatible Unix-like operating systems, with limited support for Microsoft Windows. [7]
A Bitcrusher is an audio effect that produces distortion by reducing the resolution or bandwidth of digital audio data. The resulting quantization noise may produce a "warmer" sound impression, or a harsh one, depending on the amount of reduction.
An audio analyzer is a test and measurement instrument used to objectively quantify the audio performance of electronic and electro-acoustical devices. Audio quality metrics cover a wide variety of parameters, including level, gain, noise, harmonic and intermodulation distortion, frequency response, relative phase of signals, interchannel crosstalk, and more.
The following comparison of audio players compares general and technical information for a number of software media player programs. For the purpose of this comparison, "audio players" are defined as any media player explicitly designed to play audio files, with limited or no support for video playback.