Showing papers on "Upsampling published in 1987"
TL;DR: A theoretical framework for the analysis, synthesis, and computational complexity of multirate filter banks is derived and it is shown how to obtain aliasing/ crosstalk-free reconstruction, and when perfect reconstruction is possible.
Abstract: Multirate filter banks produce multiple output signals by filtering and subsampling a single input signal, or conversely, generate a single output by upsampling and interpolating multiple inputs. Two of their main applications are subband coders for speech processing and transmultiplexers for telecommunications. Below, we derive a theoretical framework for the analysis, synthesis, and computational complexity of multirate filter banks. The use of matrix notation leads to basic results derived from properties of linear algebra. Using rank and determinant of filter matrices, it is shown how to obtain aliasing/ crosstalk-free reconstruction, and when perfect reconstruction is possible. The synthesis of filters for filter banks is also explored, three design methods are presented, and finally, the computational complexity is considered.
463 citations
TL;DR: This paper deals with linear and motion adaptive systems for both sampling patterns with special regard to the attainable spectral behavior and proposals are made for an improved motion detector using three-dimensional signal processing.
Abstract: Three-dimensional downsampling of a wide-band high-definition television signal provides an appropriate data rate for a digital transmission. Two well-known sampling patterns, fieldquincunx and linequincunx, have been proposed for downsampling of an interlaced signal. By reproducing progressive frames in the receiver, some of the disturbing effects of our present television system can be avoided. Multidimensional digital filters are also required for prefiltering prior to downsampling as for the interpolation of the missing frames. This paper deals with linear and motion adaptive systems for both sampling patterns with special regard to the attainable spectral behavior. The problems arising by the necessity to calculate a reliable motion control signal are analyzed. Proposals are made for an improved motion detector using three-dimensional signal processing.
43 citations
TL;DR: It is shown in the particular case of TV processing that the resulting effects of a block operation on small nonoverlapping blocks are very similar to the classical DSP operations based on convolutional and Fourier concepts.
26 citations
01 Apr 1987
TL;DR: The paper deals with linear and movement adaptive systems for both sampling patterns with special regard to the attainable spectral behaviour in two well-known sampling patterns for an interlaced signal.
Abstract: Three dimensional downsampling of a wideband high-definition television signal provides an appropriate data rate for a digital transmission. Two well-known sampling patterns, fieldquincunx and linequincunx, have been proposed for an interlaced signal. By reproducing progressive frames in the receiver some of the disturbing effects of our present television system can be avoided. Multi dimensional digital filters are required both for interpolation a sequence of frames from spatio-temporally subsampled television fields. The paper deals with linear and movement adaptive systems for both sampling patterns with special regard to the attainable spectral behaviour. Problems posed by calculating a reliable motion control signal are analysed under consideration of the sampling pattern. Proposals are made for an improved motion detector by three dimensional signal processing.
1 citations
01 Jan 1987
TL;DR: In this paper, a linear and movement adaptive system for both sampling patterns with special regard to the attainable spectral behaviour is proposed for calculating a reliable motion control signal under consideration of the sampling pattern.
Abstract: Three dimensional downsampling of a wideband high-definition television signal provides an appropriate data rate for a digital transmission. Two well-known sampling patterns, fieldquincunx and linequincunx, have been proposed for an interlaced signal. By reproducing progressive frames in the receiver some of the disturbing effects of our present television system can be avoided. Multi dimensional digital filters are required both for interpolation a sequence of frames from spatio-temporally subsampled television fields. The paper deals with linear and movement adaptive systems for both sampling patterns with special regard to the attainable spectral behaviour. Problems posed by calculating a reliable motion control signal are analysed under consideration of the sampling pattern. Proposals are made for an improved motion detector by three dimensional signal processing.
1 citations