Download e-book for iPad: The Engineers Guide to Standards Conversion by John Watkinson

By John Watkinson

ISBN-10: 1900739038

ISBN-13: 9781900739030

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Extra resources for The Engineers Guide to Standards Conversion

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It is a consequence of the band-limiting of the original antialiasing filter that the filtered analogue waveform could only travel between the sample points in one way. 3 a) Is the spectrum of a sampled system. Reducing the sampling rate alone causes aliasing b) as the sidebands are unchanged in width. As the reconstruction filter has the same frequency response, the reconstructed output waveform must be identical to the original band-limited waveform prior to sampling. Interpolation may be used to increase or decrease the sampling rate.

It will be evident that fixed coefficients are not suitable. 1c) shows that the filter coefficients must come from a ROM which can be addressed by the required phase. 1 a) A fractional ratio converter can be thought of as two integer ratio converters in series. b) It is far more efficient to combine the two. Each sample now requires coefficients of a different phase (overleaf). c) A ROM is required as shown which can be addressed by the phase to produce the correct coefficients (overleaf). 4 Variable interpolation In converters which need to change the aspect ratio, and in motion compensated converters, it becomes necessary to compute sample values which have an arbitrary relationship to the input sample lattice.

1 a) A fractional ratio converter can be thought of as two integer ratio converters in series. b) It is far more efficient to combine the two. Each sample now requires coefficients of a different phase (overleaf). c) A ROM is required as shown which can be addressed by the phase to produce the correct coefficients (overleaf). 4 Variable interpolation In converters which need to change the aspect ratio, and in motion compensated converters, it becomes necessary to compute sample values which have an arbitrary relationship to the input sample lattice.

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The Engineers Guide to Standards Conversion by John Watkinson


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