DTMF decoding via arithmetic Fourier transform / DecodificaÃÃo de sinais DTMF via transformada aritmÃtica de Fourier

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

Dual-Tone Multifrequency (DTMF) signalling has manifold applications and has been used in a broad range of modern Telecommunication systems, such as, for instance, telephony, voice mail, e-commerce, and interactive home banking. Due to the ever increasing demand for higher transmission rates in this scenario, the fast decoding of a DTMF signal becomes a highly important requirement for such systems. A smaller decoding time results in a capacity of simultaneously processing a larger number of channels. In this dissertation, a new method for the decoding of DTMF signals is proposed. The approach, which applies the Arithmetic Fourier Transform, is more efficient, in terms of computational complexity, than existing techniques, thus allowing a faster DTMF decoding. Theoretical aspects and features that determine the accuracy and the complexity of the proposed technique are discussed. The robustness of this method in the presence of quantizers is also examined. Simulation results are presented and a few implementations are suggested

ASSUNTO(S)

fourier series discrete fourier transform dtmf engenharia eletrica dtmf transformada discreta de fourier sÃrie de fourier fast algorithms transformada aritmÃtica de fourier algoritmos rÃpidos arithmetic fourier transform

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