Processing of digitally-coded pictures to improve perceived quality without increasing transmission channel capacity, featuring dividing the video signal into a low, middle and high frequency signals (16, 26), finely quantizing the low frequency signal (18), adding pseudo-random noise (33) to the middle frequency signal prior to quantizing (28), enhancing (36) and adding pseudo-random noise (48) prior to coarsely quantizing (50) the high frequency signal. The pseudo-random signals are subtracted...

A coding system for applying identifying data bits to a segment of a film strip having an integrated circuit bonded to a lead pattern formed on the segment by selectively piercing marking areas of the segment. A die of a punch press has a predetermined number, normally a power of 2, of pin holes which are arranged in a predetermined array. Piercing punches, one for each pin hole, are mounted on a punch holder for limited vertical movement with respect to the punch holder. The punches are arrange...

Apparatus for selectively color marking successive copies produced in a copy machine to provide color-coded copies for routing or other identification purposes.

Disclosed is a coding switch comprising at least two conductor paths each having a plurality of contact points disposed on a circuit board about at least a portion of a circle, the circles about at least a portion of which the contact points of the respective paths are disposed being coaxial, and a wiper having at least two spaced and electrically connected contact points secured to the circuit board to rotate about the center of the coaxial circles so that each contact point of the wiper can co...

A coding system for effecting band compression transmission of a binary signal such as a facsimile picture signal is disclosed. The coding system is characterized by converting each block of that binary coded m-ary digit which is associated with a length composed of a train of "0" of a binary signal into a code word having that order which corresponds to an original order of the m-ary digit which means the block in one of two groups and converting each block of that binary coded digit which is a...

A coding switch contact arrangement providing binary and complementary binary outputs from a simplified contact layout. Fixed contact tracks are located on one side of a contact board. A switching disc has mutually insulated contact groups whose contact points are radially arranged, at least one group being an angular distance from an adjacent group which is 2.sup.n times the distance between switching positions.

A lock system for cash registers or the like which does not require rotational movement of a key. The system has a key, with a pattern of lugs and gaps along an edge thereof, and a lock containing one row of fixed and one row of movable contacts are urged against the fixed contacts, in accordance with the pattern of lugs and gaps on the key, to produce the desired function.

A method and apparatus for applying a coded mark to an article for the purpose of facilitating the subsequent treatment thereof in an automatic manner utilize a coding element which is adapted to apply the mark to the article by utilising an edge of the article and so to fix the relative position of the mark on the article. In one embodiment, the coding element comprises a stamp adapted to be pasted over an edge of the article in a predetermined manner, and on which the coded mark may be written...

Coding keyboard for a teleprinter. It comprises a central plate, a lower plate which is a printed circuit panel and an upper plate forming a cover, these three plates being parallel to one another. The central plate has holes in which are inserted push-button guides. Push-buttons may slide in said guides such that, when a key connected to a push-button is lowered, a magnet fixed to the push-button controls the closing of a switch with flexible blades fixed on the upper face of the printed circui...

A method and apparatus for coding signals representing a stream of digital data groups (for example run lengths) for transmission or storage, each group representing a numerical quantity, is described. The signals are supplied via input and modify registers (4,6) and an encode latch (11) to a set of encode PROMs (12). The PROMs (12) generate for each data group a code representing the group, the code comprising a terminator codeword and, where necessary, one or more make-up codewords. The codewo...