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A discrete cosine transform (DCT) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies.The DCT, first proposed by Nasir Ahmed in 1972, is a widely used transformation technique in signal processing and data compression.
ARP4754(), Aerospace Recommended Practice (ARP) Guidelines for Development of Civil Aircraft and Systems, is a published standard from SAE International, dealing with the development processes which support certification of Aircraft systems, addressing "the complete aircraft development cycle, from systems requirements through systems verification."
The form of DCT used in signal compression applications is sometimes referred to as DCT-2 in the context of a family of discrete cosine transforms, [19] or as DCT-II. More recent standards have used integer-based transforms that have similar properties to the DCT but are explicitly based on integer processing rather than being defined by ...
The field of materials engineering is an important one within aerospace engineering. Its practice is defined by the international standards bodies [1] who maintain standards for the materials and processes involved. [2] Engineers in this field may often have studied for degrees or post-graduate qualifications in it as a speciality. [3]
The modified discrete cosine transform (MDCT) is a transform based on the type-IV discrete cosine transform (DCT-IV), with the additional property of being lapped: it is designed to be performed on consecutive blocks of a larger dataset, where subsequent blocks are overlapped so that the last half of one block coincides with the first half of the next block.
In applied mathematics, a discrete Chebyshev transform (DCT) is an analog of the discrete Fourier transform for a function of a real interval, converting in either direction between function values at a set of Chebyshev nodes and coefficients of a function in Chebyshev polynomial basis.
These standards are enforced by "designated engineering representatives" of the FAA who are usually paid by a manufacturer and certified by the FAA. In the European Union the IEC describes "recommended" requirements for safety-critical systems, which are usually adopted without change by governments. A safe, reliable piece of avionics has a "CE ...
DO-178C, Software Considerations in Airborne Systems and Equipment Certification is the primary document by which the certification authorities such as FAA, EASA and Transport Canada approve all commercial software-based aerospace systems.