نتایج جستجو برای: frequency coding
تعداد نتایج: 602083 فیلتر نتایج به سال:
Frequency-warped signal processing techniques are attractive to many wideband speech and audio applications since they have a clear connection to the frequency resolution of human hearing. A warped version of linear predictive coding (LPC) is studied in this paper. The performance of conventional and warped LPC algorithms are compared in a simulated coding system using listening tests and conve...
Polynomial cancellation coding (PCC) is a very effective technique that reduces the sensitivity of orthogonal frequency division multiplexing (OFDM) to frequency errors at the cost of reduced spectral efficiency. This paper investigates the effect of PCC on the fading characteristics of multipath channels and on the error performance OFDM in a two-path fading channels. Channel coding is employe...
This work is a contribution to the Spread Spectrum project for terrestrial HDTV broadcasting and focuses mainly on the coding of a low frequency signal with certain requirements. A new multiresolution decomposition scheme based on separable Diamond-shaped ltering is proposed. It takes advantage of Gaussian lters to extract smooth-looking frequency bands from the original signal. The deliberatel...
We analysed the temporal-frequency characteristics of two functional processes involved in orientation-based texture segregation: local orientation coding and subsequent orientation-contrast coding. Two texture images, in which each micropattern was rotated by 90 degrees, were alternated at various temporal frequencies. A micropattern was a second-derivative (D2) of a Gaussian that loses orient...
In this paper, a new approach using gradient optimization algorithm for delay locked loop (DLL) is provided. Among the salient features of this structure, the proposed DLL can be quickly locked and can be used as a high-frequency circuit. In this novel architecture a digital signal processor (DSP) is used instead of phase detector, charge pump and loop filter. In digital transmitters to select ...
Data transmission security has become an extremely important field of research. Steganography is an art of hiding information in image, audio and video files in a way that would meet the security requirements in the form of overt or covert. In this study, we propose a new hybrid steganography technique for color images that hide secret messages in the frequency domain of a cover image's blu...
In this paper, a type of multi-carrier direct sequence code division multiple access (MC-DS-CDMA) system which uses frequency spread coding is proposed and investigated for the down-link. An MC-DS-CDMA system is a combined system of CDMA and multi-carrier modulation. This system is often categorized as a “serial to parallel (S/P) type” system because serial to parallel converted data symbols ar...
To investigate the genetic basis of type 2 diabetes (T2D) to high resolution, the GoT2D and T2D-GENES consortia catalogued variation from whole-genome sequencing of 2,657 European individuals and exome sequencing of 12,940 individuals of multiple ancestries. Over 27M SNPs, indels, and structural variants were identified, including 99% of low-frequency (minor allele frequency [MAF] 0.1-5%) non-c...
Human height is a highly heritable, polygenic trait1,2. The contribution of common DNA sequence variation to inter-individual differences in adult height has been systematically evaluated through genome-wide association studies (GWAS). This approach has thus far identified 697 independent variants located within 423 loci that together explain around 20% of the heritability of height3. As is typ...
A frequently used approach for detecting potential coding regions is to search for stop codons. In the standard genetic code 3 out of 64 trinucleotides are stop codons. Hence, in random or non-coding DNA one can expect every 21st trinucleotide to have the same sequence as a stop codon. In contrast, the open reading frames (ORFs) of most protein-coding genes are considerably longer. Thus, the st...
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