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  2. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  3. Analog-to-digital converter - Wikipedia

    en.wikipedia.org/wiki/Analog-to-digital_converter

    Since a practical ADC cannot make an instantaneous conversion, the input value must necessarily be held constant during the time that the converter performs a conversion (called the conversion time). An input circuit called a sample and hold performs this task—in most cases by using a capacitor to store the analog voltage at the input, and ...

  4. Digital-to-analog converter - Wikipedia

    en.wikipedia.org/wiki/Digital-to-analog_converter

    For instance, a 1-bit DAC is designed to reproduce 2 (2 1) levels while an 8-bit DAC is designed for 256 (2 8) levels. Resolution is related to the effective number of bits which is a measurement of the actual resolution attained by the DAC. Resolution determines color depth in video applications and audio bit depth in audio applications.

  5. Portable media player - Wikipedia

    en.wikipedia.org/wiki/Portable_media_player

    MP3 was introduced as an audio coding standard in 1992. [30] It was based on several audio data compression techniques, including the modified discrete cosine transform (MDCT), FFT and psychoacoustic methods. [31] MP3 became a popular standard format and as a result most digital audio players after this supported it and hence were often called ...

  6. Operational amplifier applications - Wikipedia

    en.wikipedia.org/wiki/Operational_amplifier...

    A mechanical analogy is a class-2 lever, with one terminal of R 1 as the fulcrum, at ground potential. V in is at a length R 1 from the fulcrum; V out is at a length R 2 further along. When V in ascends "above ground", the output V out rises proportionately with the lever. The input impedance of the simplified non-inverting amplifier is high:

  7. Speech synthesis - Wikipedia

    en.wikipedia.org/wiki/Speech_synthesis

    This is an accepted version of this page This is the latest accepted revision, reviewed on 31 January 2025. Artificial production of human speech Automatic announcement A synthetic voice announcing an arriving train in Sweden. Problems playing this file? See media help. Speech synthesis is the artificial production of human speech. A computer system used for this purpose is called a speech ...

  8. Wikipedia:Reference desk/Archives/Science/December 2005 ...

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    In practice, if you plan to get all books rather than just a handful, this would hit Amazon's servers hard (perhaps as hard as thousands of customers). They are likely to have methods in place to detect this, assume they are under attack, and block your connection temporarily or permanently.

  9. Fermat's little theorem - Wikipedia

    en.wikipedia.org/wiki/Fermat's_little_theorem

    For example, if a = 2 and p = 7, then 2 7 = 128, and 128 − 2 = 126 = 7 × 18 is an integer multiple of 7. If a is not divisible by p, that is, if a is coprime to p, then Fermat's little theorem is equivalent to the statement that a p − 1 − 1 is an integer multiple of p, or in symbols: [1] [2] ().