A polyphase quadrature filter, or PQF, is a filter bank which splits an input signal into a given number N (mostly a power of 2) of equidistant sub-bands. These sub-bands are subsampled by a factor of N, so they are critically sampled.An important application of the polyphase filters (of FIR type) concerns the filtering and decimation of large band (and so high sample rate) input signals, e.g. coming from a high rate ADC, which can not be directly processed by an FPGA or in some case by an ASIC either. If the ADC plus FPGA/ASIC interface implements a demultiplexer of the ADC samples in N internal FPGA/ASIC registers, the polyphase filter transforms the decimator FIR filter canonic structure in N parallel branches clocked at 1/N of the ADC clock, allowing digital processing when N=Clock(ADC)/Clock(FPGA). This critical sampling introduces aliasing. Similar to the MDCT time domain alias cancellation the aliasing of polyphase quadrature filters is canceled by neighbouring sub-bands, i.e. signals are typically stored in two sub-bands. Note that signal in odd subbands is stored . PQF filters are used in MPEG-1 Audio Layer I and II, Musepack (which was based on MPEG-1 layer II), in MPEG-1 Layer III with an additional MDCT, in MPEG-4 AAC-SSR for the 4 band PQF bank, in MPEG-4 V3 SBRfor the analysis of the upper spectral replicated band, and in DTS. 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. The base lowpass is typically a FIR filter with a length of 10*N ... 24*N taps. Note that it is also possible to build PQF filters using recursive IIR filters. (Wikipedia).
GRCon19 - Demonstration of GNU Radio Compatibility with a NASA Space... by David Miller
Demonstration of GNU Radio Compatibility with a NASA Space Communications Network Modem by David Miller This paper presents the results of testing that the author recently conducted to demonstrate that a GNU Radio Software Defined Radio (SDR) receiver is compatible with a typical National
From playlist GRCon 2019
Quadratic System 2 Algebra Regents
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From playlist Quadratic Systems
Using a set of points determine if the figure is a parallelogram using the midpoint formula
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Determine if a set of points is a parallelogram using the distance formula
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From playlist Factor Quadratic Expressions | Difference of Two Squares
Determining if a set of points makes a parallelogram or not
👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr
From playlist Quadrilaterals on a Coordinate Plane
👉Learn how to factor quadratics using the difference of two squares method. When a quadratic contains two terms where each of the terms can be expressed as the square of a number and the sign between the two terms is the minus sign, then the quadratic can be factored easily using the diffe
From playlist Factor Quadratic Expressions | Difference of Two Squares
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From playlist Factor Quadratic Expressions | Difference of Two Squares
Introduction to Filter Design HDL Coder
Get a Free Trial: https://goo.gl/C2Y9A5 Get Pricing Info: https://goo.gl/kDvGHt Ready to Buy: https://goo.gl/vsIeA5 Get a brief introduction to Filter Design HDL Coder. For more videos, visit http://www.mathworks.com/products/filterhdl/examples.html
From playlist Code Generation and Verification
History of 3-phase Electricity & Distribution
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Determine if a set of points is a parallelogram by using the slope formula
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DDPS | Towards reliable, efficient, and automated model reduction of parametrized nonlinear PDEs
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