is a Multi -media technology in the The basic functions of sound cards are put from the microphone, tape, CD-ROM to be original voice signal conversion, output tospeakers, amplifiers, tape recorders and other sound equipment, or through the Musical Instrument Digital Interface (MIDI) instruments issued so beautiful voice.
CD-ROM drive: also known as compact disc read-only memory is a read-only optical storage medium.CD CD-DA Digital Audio It was originally used for audio CD using the CD-DA (Digital Audio) format developed.
DVD drive: is a drive to read DVD discs, in addition to compatible DVD-ROM, DVD-VIDEO, DVD-R, CD-ROM, such as a common format, for CD-R/RW, CD-I, VIDEO-CD, CD-G and so must be good support..
OMBO CD-ROM: "combo" drive people are commonly known as the COMBO drive. COMBO CD CD-ROM DVD-ROM. The COMBO drive is a collection of the CD burner, CD-ROM and DVD-ROM for the integrated multi-functional optical storage products.
Burn CD-ROM: includes CD-R, CD-RW and DVD burner and so on, which was divided into DVD burner DVD + R, DVD-R, DVD + RW, DVD-RW (W representative may repeatedly rewritable) and DVD-RAM. Burner drive and the general appearance of almost only on its front panel is usually a clear identification of writing, three types of replication and reading speed.
MODEM..
Modem (Modem) for data communications at the digital signal with limited bandwidth analog channel designed to conduct long-distance transmission, and it generally baseband, modulation and demodulation, signal amplification and filtering, balanced a few parts. Modulation is digital signal and audio carrier combinations have fit in the transmission of audio signal (analog signal); are from the audio signal demodulator to recover the digital signal.
enerally be divided into the external modem, built-in and card three. PCMCIA Through the telephone line or private network cables, external modems and computer serial interface; built-in modem directly plugged into the computer expansion slot; PC card is a computer using a direct plug in a standard PCMCIA slot.
14.4K 19.2K 28.8K 33.6K 56K 56K Modem performance and the rate is directly related to the network after the information transmission speed, the modem has a rate of 14.4K, 19.2K, 28.8K, 33.6K and 56K so 56K is currently more commonly used. CCITT . CCITT recommendations V.34 modem standard, and its biggest feature is "adaptive rate transmission", that is, during transmission, according to the quality of the local subscriber line quality, the product has the automatic adjustment function of transmission rate, which will enable the area poor line internet subscribers can also enjoy high-speed connectivity effects. V.379600~128000bps60~108kHz56000bps信 The V.37 standard with a 9600 ~ 128000bps signal rate, four-wire full-duplex communication, synchronization, single sideband modulation and 60 ~ 108kHz-based features such as group circuit; v.42 standards 56000bps-signal rate, full-duplex communication way synchronization and has a data compression and error control technology and other features.
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