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DBM (format pliku)

DBM – format pliku modułów muzycznych używany przez program DIGIBooster Pro. Struktura formatu oparta jest na samoopisujących się blokach, zwanych chunkami, podobnie jak w formatach-kontenerach IFF, czy RIFF. Każdy z bloków rozpoczyna się czterobajtowym identyfikatorem, identyfikator to cztery wielkie litery w kodzie ASCII. Po identyfikatorze następuje 32-bitowa liczba określająca długość zawartości bloku. W formacie DBM wszystkie liczby wielobajtowe są zapisane w konwencji big endian. Jeżeli chodzi o teksty zapisane w module, nie zakłada się żadnej konkretnej strony kodowej. Najczęściej jest to standardowa dla Amigi strona ECMA Latin-1 czyli ISO-8859-1.


dBm – logarytmiczna jednostka miary mocy odniesiona do mocy 1 mW – stąd oznaczenie dBm. Moc wyrażona w dBm informuje o ile decybeli moc ta jest większa lub mniejsza od mocy 1 mW: P }


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dBm is unit of level used to indicate that a power ratio is expressed in decibels with reference to one milliwatt. It is used in radio, microwave and fiber-optical communication networks as a convenient measure of absolute power because of its capability to express both very large and very small values in a short form compared to dBW, which is referenced to one watt. Since it is referenced to the watt, it is an absolute unit, used when measuring absolute power. By comparison, the decibel dB is a dimensionless unit, used for quantifying the ratio between two values, such as signal-to-noise ratio. The dBm is also dimensionless but since it compares to a fixed reference value the dBm rating is an absolute one. In audio and telephony, dBm is typically referenced relative to a 600-ohm impedance, while in radio-frequency work dBm is typically referenced relative to a 50-ohm impedance.


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List of column-oriented DBMSes

Oracle Autonomous Datawarehouse Cloud Service Scylla database Cloud MariaDB SkySQL Amazon Redshift Snowflake Computing Microsoft Azure SQL Data Warehouse Google BigQuery

Array DBMS

Array database management systems provide database services specifically for arrays, that is: homogeneous collections of data items, sitting on a regular grid of one, two, or more dimensions. Often arrays are used to represent sensor, simulation, image, or statistics data. Such arrays tend to be Big Data, with single objects frequently ranging into Terabyte and soon Petabyte sizes; for example, today’s earth and space observation archives typically grow by Terabytes a day. Array databases aim at offering flexible, scalable storage and retrieval on this information category.

Column-oriented DBMS

A column-oriented DBMS is a database management system that stores data tables by column rather than by row. Practical use of a column store versus a row store differs little in the relational DBMS world. Both columnar and row databases can use traditional database query languages like SQL to load data and perform queries. Both row and columnar databases can become the backbone in a system to serve data for common extract, transform, load and data visualization tools. However, by storing data in columns rather than rows, the database can more precisely access the data it needs to answer a query rather than scanning and discarding unwanted data in rows. Query performance is increased for certain workloads.


dBm0 is an abbreviation for the power in dBm measured at a zero transmission level point. dBm0 is a concept used amongst other areas in audio/telephony processing since it allows a smooth integration of analog and digital chains. Notably, for A-law and μ-law codecs the standards define a sequence which has a 0 dBm0 output. Note 1: A consequence for the A-law and μ-law codecs of the 0 dBm0 definition is that they have a respective 3.14 dBm0 and 3.17 dBm0 maximum signal level ratio between the maximum obtainable sine wave amplitude and the specified reference 0 dBm0 sine wave amplitude. Note 2: 0 dBm0 is often replaced by or used instead of digital milliwatt or zero transmission level point. The "unit" dBm0 is used to describe levels of digital signals. E.g. the nominal downlink level in mobile phone telecommunication at the point of interconnection POI is -16 dBm0. The unit is derived from its counterpart dBm. Even though digitally represented signals have nothing to do with absolute power levels and cannot be expressed as dBm, the dinosaurs of telephonometrie had problems thinking in levels relative to full scale, so they introduced the completely redundant pseudo-digital unit of "dBm0". It actually connects both, the old world of analogue telecommunication and the new world of digital communication in a weird and unnatural way. The 0 dBm0 level corresponds to the digital milliwatt DMW and is defined as the absolute power level at a digital reference point of the same signal that would be measured as the absolute power level, in dBm, if the reference point was analog. The absolute power in dBm is defined as 10 log power in mW/1 mW. When the test impedance is 600 Ω resistive, dBm can be referred to a voltage of 775mV, which results in a reference active power of 1 mW. 0 dBm0 corresponds to an overload level of approximately 3 dBm in the A/D conversion. Given a sine signal of RMS Voltage of 0.775.} TIA-810 characterizes: "When a 0.775 volt rms analog signal is applied to the coder input, a 0 dBm0 digital code is present at the digital reference. In general, when a 0 dBm0 digital code is applied to the decoder, a 0.775 volt rms analog signal appears at the decoder output. More specifically, when the 0 dBm0 periodic sequence as given in Table 2, in either mu-law or A-law as appropriate, is applied to the decoder at the digital reference point, a 1 kHz, 0.775 volt rms sine-wave signal appears at the decoder output. 0 dBm0 is 3.14 A-law or 3.17 mu-law dB below digital full scale." A more commonly used unit for digital signal levels is dB Full Scale or dBFS. The relationship between dBm0 and dBFS is unfortunately ambiguous. It depends how you define rms and peak levels in a sampled system. The level of 0 dBm0 is defined as specific pattern in a sampled system see standards referenced below. However, In an A-law coded system, the maximum level of a sinusoidal in such a system is +3.14 dBm0. The ambiguity is if the level is a peak or rms value. Today, the interpretation by many companies tend to go towards the rms interpretation. This means that +3.14 dBm0 = 0dBFS peak and -3dBFS rms. This also means that the same signal has a peak level of +6.14dBm0 peak. This means that the commonly used Point of Interconnect level of -16dBm0 can be transformed to -22.14dBFS rms in a A-law codec system. -22.17 dBFSrms in a μ-law codec system.

Rel (DBMS)

Rel is an open-source true relational database management system that implements a significant portion of Chris Date and Hugh Darwens Tutorial D query language. Primarily intended for teaching purposes, Rel is written in the Java programming language.

Polyhedra DBMS

Polyhedra is a family of relational database management systems offered by ENEA AB, a Swedish company. The original version of Polyhedra was an in-memory database management system which could be used in high availability configurations; in 2006 Polyhedra Flash DBMS was introduced to allow databases to be stored in flash memory. All versions employ the client–server model to ensure the data are protected from misbehaving application software, and they use the same SQL, ODBC and type-4 JDBC interfaces. Polyhedra is targeted primarily for embedded use by Original Equipment Manufacturers, and big-name customers include Ericsson, ABB, Emerson, Lockheed Martin, United Utilities and Siemens AG.


Database Manager DBM, a component of 1987s Extended Edition v1.0 release of IBMs OS/2 operating system dBm, a unit for power measurement Difference bound matrix, a data structure used in a field of computer science Dibenzoylmethane, an aromatic diketone: 1.3-diphenylpropane-1.3-dione DBM computing, family of key-value database engines including dbm, ndbm, gdbm, and Berkeley DB Dibromomethane, a halomethane

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