Abstract: The invention described herein is an efficient motion compensation apparatus for digital video format down-conversion. This apparatus is characterized by an interpolation and decimation filters implemented using efficient computation architectures. The computation architecture comprises the frequency component computing section, coefficient weighting section and pixel reconstruction section. A simple architecture for both interpolation and decimation filtering processes has been invented. The result is the dramatic reduction of the shifting and adding or subtracting operations, making them suitable for implementation in LSI realization of the video format down-conversion of digital video systems.

Abstract: A method and an apparatus for measuring the instantaneous frequency of FM modulated signals, includes sampling, instantaneous frequency computing, and lowpass filtering. FM modulated signal are sampled at prescribed intervals to provide digitized FM signal. The instantaneous frequency is computed by manipulating the digitized FM signal mathematically using a new mathematical equation proposed in this invention to provide the instantaneous frequency based on digitized FM signal samples. More accurate instantaneous frequency values can be obtained by filtering the computed instantaneous frequency values using a lowpass filter.

Abstract: A method and an apparatus for measuring the instantaneous frequency of FM modulated signals, comprises a sampling means, an instantaneous frequency computing means and a lowpass filtering means. The sampling means samples FM modulated signal at prescribed intervals to provide digitized FM signal. The instantaneous frequency computing means manipulates the digitized FM signal mathematically using a new mathematical equation proposed in this invention to provide the instantaneous frequency based on digitized FM signal samples. More accurate instantaneous frequency values can be obtained by filtering the computed instantaneous frequency values using a lowpass filter.