1
Charles P Sandbank: Device for the remote control of a videorecorder or a videoreceiver. British Broadcasting Corporation, Robert F O Connell, December 5, 1989: US04885579 (138 worldwide citation)

A conventional video recorder comprises electromechanical components, electronic circuits and a control unit with which there are associated both front panel controls and a user remote control unit with a sensor to which signals can be sent from a hand-held remote control unit. In addition to these ...


2
Nicholas D Wells, Michael J Knee, Charles P Sandbank: Method of coding a video signal for transmission in a restricted bandwidth. British Broadcasting Corporation, Robert F O Connell, August 29, 1989: US04862264 (75 worldwide citation)

A video signal is coded for transmission in a restricted bandwidth by sub-dividing a frame of picture information into a set of constituent blocks, measuring the amount of picture activity in each block, sampling the information in each block at a rate related to the amount of picture activity in th ...


3
Ian R Pullen, Charles P Sandbank: Data transmission in active picture period. British Broadcasting Corporation, Robert F O Connell, December 24, 1991: US05075773 (69 worldwide citation)

A method and apparatus for transmitting extended aspect ratio pictures is described. The transmitted pictures can be viewed on an extended aspect ratio high definition screen but can also be viewed on a reduced number of lines on a conventional receiver. The lines not used in the picture viewed on t ...


4
Charles P Sandbank, Ian Childs, Richard Storey: Bandwidth compression for television signals. British Broadcasting Corporation, Robert F O Connell, July 17, 1990: US04942466 (32 worldwide citation)

A video signal received from a source (10) is bandwidth-compressed by filters (12, 14, 16), filter (14) being a temporal filter and filter (16) being a spatial filter. Selection of the filter to be used is dependent upon picture content. The transmitter reconstitutes in interpolators (44, 46) the si ...


5
Andrew Oliphant, Charles P Sandbank: Color television system. British Broadcasting Corporation, Robert F O Connell, July 11, 1989: US04847676 (5 worldwide citation)

In a color television signal the total line length or period and the bandwidth requirement can be conventional, but the active line period is increased to e.g. about 94% of the line period, giving an aspect ratio of about 3:2 instead of 4:3.


6
Charles P Sandbank, Richard Storey, Martin Weston: Television signals. British Broadcasting Corporation, Robert F O Connell, October 1, 1991: US05053857 (2 worldwide citation)

In order to achieve increased resolution and to minimise cross-colour and cross-luminance effects in a PAL, NTSC or SECAM encoded signal, a high definition source (20) is pre-filtered at a higher line rate according to one of at least two methods (22, 24, 26). The filtered signal is sub-sampled (at ...