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  1. 21,206.35
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    截至 2022年6月27日, 週一 上午 8:49 EDT · (USD)。(股價延遲20分鐘)。市場開市中。
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    • 今日股價區間
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  2. › wiki › BitcoinBitcoin - Wikipedia

    Bitcoin ( ) is a decentralized digital currency that can be transferred on the peer-to-peer bitcoin network. [7] Bitcoin transactions are verified by network nodes through cryptography and recorded in a public distributed ledger called a blockchain.The cryptocurrency was invented in 2008 by an unknown person or group of people using the name Satoshi Nakamoto. [10]

    • BTC, XBT
    • 10−8
    • bitcoins
    • ₿ (Unicode: .mw-parser-output .monospaced{font-family:monospace,monospace}U+20BF ₿ BITCOIN SIGN)
  3. › wiki › Bit_rateBit rate - Wikipedia

    • Prefixes
    • in Data Communications
    • Multimedia
    • Encoding Bit Rate
    • External Links

    When quantifying large or small bit rates, SI prefixes (also known as metric prefixesor decimal prefixes) are used, thus: Binary prefixes are sometimes used for bit rates.The International Standard (IEC 80000-13) specifies different abbreviations for binary and decimal (SI) prefixes (e.g. 1 KiB/s = 1024 B/s = 8192 bit/s, and 1 MiB/s = 1024 KiB/s).

    Gross bit rate

    In digital communication systems, the physical layer gross bitrate, raw bitrate, data signaling rate, gross data transfer rate or uncoded transmission rate (sometimes written as a variable Rb or fb) is the total number of physically transferred bits per second over a communication link, including useful data as well as protocol overhead. In case of serial communications, the gross bit rate is related to the bit transmission time T b {\\displaystyle T_{b}} as: 1. R b = 1 T b , {\\displaystyle R_...

    Information rate

    The physical layer net bitrate, information rate, useful bit rate, payload rate, net data transfer rate, coded transmission rate, effective data rate or wire speed (informal language) of a digital communication channel is the capacity excluding the physical layer protocol overhead, for example time division multiplex (TDM) framing bits, redundant forward error correction (FEC) codes, equalizer training symbols and other channel coding. Error-correcting codes are common especially in wireless...

    Network throughput

    The term throughput, essentially the same thing as digital bandwidth consumption, denotes the achieved average useful bit rate in a computer network over a logical or physical communication link or through a network node, typically measured at a reference point above the datalink layer. This implies that the throughput often excludes data link layer protocol overhead. The throughput is affected by the traffic load from the data source in question, as well as from other sources sharing the sam...

    In digital multimedia, bitrate represents the amount of information, or detail, that is stored per unit of time of a recording. The bitrate depends on several factors: 1. The original material may be sampled at different frequencies. 2. The samples may use different numbers of bits. 3. The data may be encoded by different schemes. 4. The informatio...

    In digital multimedia, bit rate refers to the number of bits used per second to represent a continuous medium such as audio or video after source coding (data compression). The encoding bit rate of a multimedia file is its size in bytesdivided by the playback time of the recording (in seconds), multiplied by eight. For realtime streaming multimedia...

    • Advantages and Disadvantages of VBR
    • Methods of VBR Encoding
    • See Also

    The advantages of VBR are that it produces a better quality-to-space ratio compared to a CBR file of the same data. The bits available are used more flexibly to encode the sound or video data more accurately, with fewer bits used in less demanding passages and more bits used in difficult-to-encode passages. The disadvantages are that it may take mo...

    Multi-pass encoding and single-pass encoding

    VBR is created using so-called single-pass encoding or multi-pass encoding. Single-pass encoding analyzes and encodes the data "on the fly" and it is also used in constant bitrate encoding. Single-pass encoding is used when the encoding speed is most important — e.g. for real-time encoding. Single-pass VBR encoding is usually controlled by the fixed quality setting or by the bitrate range (minimum and maximum allowed bitrate) or by the average bitrate setting. Multi-pass encoding is used when...

    Bitrate range

    This VBR encoding method allows the user to specify a bitrate range — a minimum and/or maximum allowed bitrate.Some encoders extend this method with an average bitrate. The minimum and maximum allowed bitrate set bounds in which the bitrate may vary. The disadvantage of this method is that the average bitrate (and hence file size) will not be known ahead of time. The bitrate range is also used in some fixed quality encoding methods, but usually without permission to change a particular bitrate.

    Average bitrate

    The disadvantage of single pass ABR encoding (with or without Constrained Variable Bitrate) is the opposite of fixed quantizer VBR — the size of the output is known ahead of time, but the resulting quality is unknown, although still better than CBR. The multi-pass ABR encoding is more similar to fixed quantizer VBR, because a higher average will really increase the quality.

  4. › wiki › BitdefenderBitdefender - Wikipedia

    • History
    • Bitdefender Products
    • Fighting Cyber-Crime
    • Controversies and Incidents
    • See Also

    Bitdefender software was originally developed by SOFTWIN and sold as AVX (Antivirus Expert) from 1996 until 2001, when its name was changed. In 2007, SOFTWIN spun off Bitdefender.

    Bitdefender develops and markets cybersecurity products and services for companies and consumers including endpoint protection (with hardening and risk analytics capabilities), extended detection and response, multi-cloud security, and managed detection and response, antivirus software, IoT security, VPN and privacy services. The company also deliv...

    Bitdefender advises Europol's European Cybercrime Centre (EC3) in supporting investigations into criminal activity in cyberspace, sharing relevant data and knowledge about disruption, prevention, investigation and prosecution. The company is involved in ongoing cooperation with international law enforcement actors such as local, regional and intern...


    On March 20, 2010, computers running Bitdefender under 64-bit versions of Windows were affected by a malfunctioning update which classified every executable program as well as dll files as infected. These files were all marked as 'Trojan.FakeAlert.5' and were moved into quarantine. This action led to software and systems malfunctions that affected users around the world. Bitdefender representatives announced the removal of the faulty update and a workaround for the users affected,except for t...

    DarkSide ransomware

    In 2021, Bitdefender was accused of self-promotion when releasing and publicly announcing a decryptor to the detriment of actual victims with regards to DarkSide, a hacking group. In 2020, DarkSide switched their main encryption ransomware product over to an "affiliate" model wherein other attackers could download and use their software in exchange for a portion of the profits. However, they introduced a bug in the process where affiliate hackers would all use the same private RSA key - meani...

    REvil Ransomware

    In September 2021, Bitdefender published a universal decryptor utility that will help past victims of the REvil ransomware recover their encrypted files.

  5. › wiki › MegabitMegabit - Wikipedia

    Yibit. yobibit. —. Orders of magnitude of data. The megabit is a multiple of the unit bit for digital information. The prefix mega (symbol M) is defined in the International System of Units (SI) as a multiplier of 10 6 (1 million), [1] and therefore. 1 megabit = 106 bits = 1 000 000 bits = 1000 kilobits. The megabit has the unit symbol Mbit ...

  6. › wiki › GigabitGigabit - Wikipedia

    The prefix giga (symbol G) is defined in the International System of Units (SI) as a multiplier of 10 9 (1 billion, short scale ), and therefore. 1 gigabit = 109 bits = 1 000 000 000 bits. The gigabit has the unit symbol Gbit or Gb . Using the common byte size of 8 bits, 1 Gbit is equal to 125 megabytes (MB) or approximately 119 mebibytes (MiB).

  7. › wiki › TerabitTerabit - Wikipedia

    The prefix tera (symbol T) is defined in the International System of Units (SI) as a multiplier of 10 12 (1 trillion, short scale ), and therefore. 1 terabit = 1012 bits = 1 000 000 000 000 bits = 1000 gigabits. The terabit has the unit symbol Tbit or Tb . The terabit is closely related to the tebibit, a unit multiple derived from the binary ...

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