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Flash-based players: These are non-mechanical solid state devices that hold digital audio files on internal flash memory, removable flash memory cards or a USB flash drive. Due to technological advances in flash memory, these originally low-capacity storage devices are now available commercially ranging up to 128 GB.
The Certified Wireless USB logo. Wireless USB (Universal Serial Bus) is a short-range, high-bandwidth wireless radio communication protocol created by the Wireless USB Promoter Group, which is intended to increase the availability of general USB-based technologies. It is unrelated to Wi-Fi and
Computer speakers, or multimedia speakers, are speakers sold for use with computers, although usually capable of other audio uses, e.g. for an MP3 player. Most such speakers have an internal amplifier and consequently require a power source, which may be by a mains power supply often via an AC adapter, batteries, or a USB port.
The interface class is used when a USB device can contain more than one function. It is possible, therefore, to have USB devices with two different interfaces at the same time (for example, a USB telephone may use a keypad covered by the HID class and a speaker covered by the USB communications device class).
The turn of the millennium saw the widespread introduction of solid-state removable media, with the SD card being introduced in 1999, followed by the USB flash drive in 2000. [21] The capacity of these removable flash drives improved over time, with 2013 seeing Kingston unveiling a 1 terabyte USB flash drive. [22]
The latest sound cards support up to 8 audio channels for the 7.1 speaker setup. [12] A few early sound cards had sufficient power to drive unpowered speakers directly – for example, two watts per channel. With the popularity of amplified speakers, sound cards no longer have a power stage, though in many cases they can adequately drive ...
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