A method and apparatus for performing compression and/or decompression is described. In one embodiment, the present invention comprises a system having a buffer, a wavelet transform unit, and a coder. The wavelet transform unit has an input coupled to the buffer to perform a wavelet transform on pixels stored therein and to generate coefficients at an output. The coder is coupled to the wavelet transform unit to code the transformed pixels received from the buffer.

Clock generation techniques are disclosed to provide clock generation with duty cycle replication. The clock generation techniques may further compensate for clock insertion delays and minimize distortion due to clock distribution networks.

A method of generating data representative of a geographical network (such as a road network) is disclosed, comprising steps of selecting from a database (2) data relating to an extended junction (formed from at least one node at least one edge) and outputting the selected data. The method address problems in existing devices relating to the selection of appropriate data, and finds particular application in the field of mobile devices and the like. Apparatus for generating data representative of...

Negative ions are generated by passing a stream of gas and water vapour free of water droplets through a corona discharge of 5,000 volts or more.

Apparatus for and methods of monitoring the current comprised by a beam of charged particles, for example a focussed ion beam as used for ion implantation of surfaces such as semiconductor circuit substrates, is described. The beam is amplitude modulated and the resultant corresponding modulation of the magnetic field strength of the beam is detected, for example by a toroidal coil, to produce an output signal proportional to the field strength modulation and therefore proportional to the beam c...

Pulsato is generated by the acoustical mixing of sounds emitted from two frequency shift channels. In one channel a musical or other signal is frequency shifted upwardly by several Hertz, and in a second channel the frequencies are shifted downwardly by a like amount. The listener perceives a pleasing pulsato effect at a frequency equal to the sum of the frequency deviation introduced in the two channels. In another embodiment, a third channel reproduces the musical signal unshifted in frequency...

Tail-less airplanes, such as dsclosed in U. S. Pat. No. 3,438,597 as a stall occurs or is about to occur, may be flown at very high angles of attack to generate favorable spanwise vorte, flows which augment the swept wing profiles creating resultant wing profiles having better lift characteristics, i.e., the vortexes created are lift generating. However, the aircraft is then uncomfortable to be in during such flights at very high angles of attack. Therefore to achieve the benefits of this lift g...

A programmable function generator, which is suitable for construction in integrated circuit form, includes a current ladder which produces an output voltage or current which is a programmable function of an input voltage or current at n evenly spaced values of the input voltage or current corresponding to n spaced output points along the current ladder. Accurately controlled current sources or current drivers control the flow of currents to each of the n points and the flow of current from termi...

An electrical wave generation circuit for providing a modified saw-tooth wave which includes a means for effecting a substantially instantaneous change in the saw-tooth configuration upon the selective application of relatively positive and negative d.c. sources thereto in an alternating fashion. The circuit includes an integrating circuit having impedance means which serves to effect the instantaneous change in output signal.

An apparatus for the reduction in the generation of ozone during the discharge of corona wires which includes the wire surrounded on three sides by a screen and on the fourth side by a surface accepting a charge with a possible grid arranged in front of the surface. The method involves connecting the screen to a voltage between that of the support of the charge accepting surface and that of the corona wire.