A certificate of deposit (CD) is a time deposit, a financial product commonly sold by banks, thrift institutions, and credit unions.CDs differ from savings accounts in that the CD has a specific, fixed term (often one, three, or six months, or one to five years) and usually, a fixed interest rate.
cd (elliptic function), one of Jacobi's elliptic functions; Other uses in science and technology. Cadmium or Cd, a chemical element; Candela or cd, a unit of light intensity-CD, the North American call sign suffix for Class A low-power television stations operating with digital signals; Circular dichroism, a form of spectroscopy
Compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony and released in 1982. The format was originally developed to store and play only digital audio recordings but was later adapted for storage of data ().
The Compact Disc-Interactive (CD-I, later CD-i) is a digital optical disc data storage format that was mostly developed and marketed by Dutch company Philips.It was created as an extension of CDDA and CD-ROM and specified in the Green Book, co-developed by Philips and Sony, to combine audio, text and graphics.
A CD player is an electronic device that plays audio compact discs, which are a digital optical disc data storage format. CD players were first sold to consumers in 1982. CDs typically contain recordings of audio material such as music or audiobooks.
CD-R (COMPACT DISC – Recordable) is a digital optical disc storage format. A CD-R disc is a compact disc that can be written once and read arbitrarily many times.. CD-R discs (CD-Rs) are readable by most plain CD readers, i.e., CD readers manufactured prior to the introduction of CD-R.
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An album is a collection of audio recordings issued as a collection on compact disc (CD), vinyl, audio tape, or another medium.Albums of recorded sound were developed in the early 20th century as individual 78-rpm records collected in a bound book resembling a photograph album; this format evolved after 1948 into single vinyl LP records played at 33 1 ⁄ 3 rpm.
Um CD é um disco de acrílico, sobre o qual é impressa uma longa espiral (22,188 voltas, totalizando 5,6 km de extensão). As informações são gravadas em furos nessa espiral, o que cria dois tipos de irregularidades físicas: pontos brilhantes e pontos escuros.
A CD-t eredetileg a hanglemezek utódaként emlegették, de inkább mint adathordozó érte el sikereit, bár karrierje elején valóban csak és kizárólag zeneszámok tárolására alkalmazták. 1985 júniusában a CD-ROM-ot (csak olvasható memória) és 1990-ben az újraírható CD-t (CD-RW) mutatta be a Sony és a Philips.
Historia. CD:ns kommersiella historia tog sin början under tidigt 1980-tal, men redan i slutet av 1960-talet började holländska Philips och japanska NHK på var sitt håll utveckla digitala metoder att lagra ljud. År 1970 tog Philips fram en prototyp på en glasskiva som kunde avläsas av en laser.