Editing CD player (section)

==CD player features==
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CD players can employ a number of ways to improve performance or reduce component count or price. Features such as oversampling, one-bit DACs, dual DACs, interpolation (error correction), anti-skip buffering, digital and optical outputs are, or were, likely to be found. Other features improve functionality, such as track programming, random play and repeat, or direct track access. Yet others are related to the CD player's intended target, such as anti-skip for car and portable CD players, pitch control and queuing for a DJ's CD player, remote and system integration for household players. Description of some features follows:

*''[[Oversampling]]'' is a way to improve the performance of the low pass filter present at the output of most CD players. By using a higher sampling frequency, a multiple of the 44.1&nbsp;kHz used by CD encoding, it can employ a filter with much lower requirements.
*''[[Delta-sigma modulation#Digital-to-analog conversion|One-bit DACs]]'' were less expensive than other types of DACs, while providing similar performance.
*''Dual DACs'' were sometimes advertised as a feature because some of the early CD players used a single DAC, and switched it between channels. This required additional supporting circuits, possibly degrading sound quality.
*''Anti-skip'', ''Antishock'', or [[Electronic skip protection|''electronic skip protection'']] is a way for the CD player to avoid interrupting the audio output when mechanical shock is experienced by the disc playback mechanism. It consists of an additional data processor and a [[RAM chip]] installed on the player that reads the disc at double speed and stores various frames of audio data in a RAM [[memory buffer]] for later decoding. Some players may compress the audio data prior to buffering to use lower capacity (and less expensive) RAM chips. Typical players can store about 44 seconds of audio data on a 16&nbsp;Mbit RAM chip.