North American Philips Corporation

Philips Electronics North America Corporation

Eberhard H Fisch

Mikhail Tsinberg

Alan P Cavallerano

Faramarz Azadegan

Apparatus for converting a digital video signal between two different formats, such as interlaced field and non-interlaced progressive frame, and which avoids filtering and sub-sampling of portions of the video data which are the same in either format. For conversion from interlaced field to progressive frame, only alternate fields of the signal are subjected to digital filtering. The filtered fields are then combined with the non-filtered fields, which are subjected only to an equivalent delay, to derive averaged frames which constitute a progressive frame video signal. For the reverse conversion, alternate scan lines of each frame are sub-sampled and averaged to derive a field which is then interlaced with a field formed by the remaining scan lines of such frame, thereby deriving an interlaced field video signal.

Apparatus for converting a digital video signal which corresponds to a

A method and apparatus for generating and receiving a high definition television signal suitable for use in a broadcasting environment wherein a conventional television signal is also used, having multiple frequency multiplexed subcarriers placed within the frequency spectrum of the signal so as to minimize interference with and from the conventional television signal.

Method and apparatus for the transmission and reception of a

A method and apparatus for digital encoding are described for compressing the augmentation channel signals (chrominance and luminance signals for panel information and high frequency luminance and line difference signal) so that this information can be transmitted in a 3 MHz wide RF channel using a digital transmission scheme such as QPSK. Analog signal components are sampled and converted to digital signals. Each of the signals is fed into a separate coder which reduces the number of bits/pixel required to reconstruct the original signal. Compression is achieved by quantization and removal of redundancy. The compression scheme is based on the use of DCT together with VLC. Each augmentation signal has its own coder, which is adapted to the unique statistics of this signal.

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Yonkers, NY, United States of America

Eberhard H Fisch