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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.
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.
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 ...
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."
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.
Control engineering – or control systems engineering, is an engineering discipline that applies automatic control theory to design systems with desired behaviors in control environments. [48] The discipline of controls overlaps and is usually taught along with electrical engineering at many institutions around the world. [48] Controllability –
Advanced Supersonic Transport (AST) model in wind tunnel. The aircraft design process is a loosely defined method used to balance many competing and demanding requirements to produce an aircraft that is strong, lightweight, economical and can carry an adequate payload while being sufficiently reliable to safely fly for the design life of the aircraft.
Comparative Analysis compares the function of the proposed part to the OAH part. As an example: If a PMA application for flight control cables were to show that the PMA part exceeds the pull strength requirements of the aircraft system it is meant for, that is general analysis. To show that it exceeds that of the OAH part is comparative analysis.