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  2. Rat-race coupler - Wikipedia

    en.wikipedia.org/wiki/Rat-race_coupler

    A rat-race coupler, also known as a hybrid ring coupler, is a type of coupler used in RF and microwave systems. In its simplest form, it is a 3 dB coupler and is thus an alternative to a magic tee .

  3. Power dividers and directional couplers - Wikipedia

    en.wikipedia.org/wiki/Power_dividers_and...

    This synonymously meant a quadrature 3 dB coupler with outputs 90° out of phase. Now any matched 4-port with isolated arms and equal power division is called a hybrid or hybrid coupler. Other types can have different phase relationships. If 90°, it is a 90° hybrid, if 180°, a 180° hybrid and so on.

  4. In-phase and quadrature components - Wikipedia

    en.wikipedia.org/wiki/In-phase_and_quadrature...

    The two amplitude-modulated sinusoids are known as the in-phase (I) and quadrature (Q) components, which describes their relationships with the amplitude- and phase-modulated carrier. [ A ] [ 2 ] Or in other words, it is possible to create an arbitrarily phase-shifted sine wave, by mixing together two sine waves that are 90° out of phase in ...

  5. Marques Brownlee - Wikipedia

    en.wikipedia.org/wiki/Marques_Brownlee

    Brownlee's reviews have been promoted by review sites. Engadget promoted the site in January 2012 when they featured his tour of the then-new cloud storage service called Insync. [ 14 ] In November 2013, one of Brownlee's most viral videos was posted based on the LG G Flex , where he performed various scratch tests to demonstrate the self ...

  6. Polyphase quadrature filter - Wikipedia

    en.wikipedia.org/wiki/Polyphase_quadrature_filter

    PQF has an advantage over the very similar stacked quadrature mirror filter (QMF). Delay and computational effort are much lower. A PQF filter bank is constructed using a base filter, which is a low-pass at fs/4N. This lowpass is modulated by N cosine functions and converted to N band-passes with a bandwidth of fs/2N.

  7. Balun - Wikipedia

    en.wikipedia.org/wiki/Balun

    Isolation transformer. In classical transformers, there are two electrically separate windings of wire coils around the transformer's core. The advantage of transformer-type over other types of balun is that the electrically separate windings for input and output allow these baluns to connect circuits whose ground-level voltages are subject to ground loops or are otherwise electrically ...

  8. User review - Wikipedia

    en.wikipedia.org/wiki/User_review

    User reviews might be compared to professional nonprofit reviews from a consumer organization, or to promotional reviews from an advertiser or company marketing a product. Growth of social media platforms has enabled the facilitation of interaction between consumers after a review has been placed on online communities such as blogs , internet ...

  9. aptX - Wikipedia

    en.wikipedia.org/wiki/AptX

    The example CD-quality 16-bit 44 kHz (up to 22 kHz signal bandwidth) stream is divided by two layers of 64-tap QMF (Quadrature mirror filter) into four 16-bit subbands of 11 kHz (up to 5.5 kHz signal bandwidth each). The first 64-tap QMF divides into two bands (0–11 kHz and 11–22 kHz bands), and then each one is fed into another 64-tap QMF ...