(Elektrik, Elektronik) A diplexer is a device that combines radio frequency inputs from two or more radio transmitters into a single output, or, when used in the opposite direction, divides a single RF input into two or more outputs based on frequency using bandpass filters. Depending on how it is used, a diplexer may be called a combiner or splitter. The device is referred to as a duplexer in land mobile radio, where a receiver and transmitter are sometimes combined onto the same antenna. Though the basic goal is the same in all diplexers, there are massive variations in scale depending upon the application
A signal-combining network that allows several discrete inputs to be added into a common bandwidth and that has high isolation between inputs Also may refer to a power-combining network
In a cryptographic context, a combiner is a mechanism which mixes two data sources into a single result A "combiner style cipher" refers to a stream cipher Reversible combiners are used to encipher plaintext into ciphertext in a stream cipher The ciphertext is then deciphered into plaintext using a related inverse or extractor mechanism Irreversible or non-invertible combiners are often used to mix multiple RNG's into a single confusion sequence, also for use in stream cipher designs Also see balanced combiner, additive combiner and complete, and The Story of Combiner Correlation: A Literature Survey, in the Literature Surveys and Reviews section of the Ciphers By Ritter page