A Low-Delay MDCT/IMDCT

Abstract

This letter presents an algorithm for selecting a low delay for the modified discrete cosine transform (MDCT) and inverse MDCT (IMDCT). The implementation of conventional MDCT and IMDCT requires a 50% overlap‐add (OLA) for a perfect reconstruction. In the OLA process, an algorithmic delay in the frame length is employed. A reduced overlap window and MDCT/IMDCT phase shifting is used to reduce the algorithmic delay. The performance of the proposed algorithm is evaluated by applying the low‐delay MDCT to the G. 729.1 speech codec.

Optimizing the structure and optoelectronic properties of cuprite thin films via a plasma focus device as a solar cell absorber layer

“…26 Numerous deposition techniques have been investigated for producing Cu 2 O thin films, including Chemical Vapor Deposition (CVD), 27 Metal-Organic Chemical Vapor Deposition (MOCVD), 28 thermal evaporation, 29 and sputtering. [30][31][32][33] In the present study, the emphasis is placed on utilizing a plasma focusing device (PFD) for the deposition of Cu 2 O thin films, attributed to the numerous advantages it proffers, such as high ion energy, localized deposition, 34 and potential for scalability, thereby presenting itself as a compelling alternative for the fabrication of superior thin films. 35 The primary objective of this research is to execute a systematic investigation into the effects of deposition parameters, with a specific emphasis on plasma focusing shots and the structural and optoelectronic properties of the Cu 2 O thin films.…”