Abstract:
An impact printer (10) in which the action of a rotatable cam assembly (50) positions a plurality of type racks (22), enables printing and indexes paper (12) prior to restoring the type racks to the home position. Teeth (54) on the cam assembly engage teeth (30) on the type racks for positioning thereof and an extended tooth (62) on the cam assembly causes impact of the racks against a platen (14) which is caused to be rotated by movement of the cam assembly to index the paper to the next print line.
Abstract:
A data recovery circuit (20) for use in a data processing system where plural subsystems are linked by a bit serial transmission line. The data transmitted over the bit serial transmission line is in the form of a phase encoded (PE) pulse signal (ENDATA). The data recovery circuit (20) includes a time delay circuit for delaying the PE pulse signal (ENDATA) by a three-quarter bit period. The three-quarter bit period delay signal permits the generation of a control clock signal. The control clock signal is used in sampling the PE pulse signal at three-quarter bit period points in order to generate a control signal (CNTRL) that indicates the absence or presence of a transition at the midpoint of each bit period of the PE pulse signal (ENDATA). The control signal (CNTRL) is used to generate a recovered clock signal (RCLK) by logically combining the control signal (CNTRL) with the PE pulse signal (ENDATA) and a one-half bit period delayed PE pulse signal (HBTD). The control signal (CNTRL) is also used to generate a recovered data signal (RDATA) by clocking the control signal (CNTRL) into two cascaded flip-flops and logically combining the outputs of the two cascaded flip-flops.
Abstract:
A pair of narrow channel IGFET devices (10A, 10B) having separate insulated gate electrode structures (19A, 19B) formed over narrow channel regions (28A, 28B) of a substrate (11) flanking a central enhancement region (27). Methods of forming the narrow channel regions using a single photolithography step and forming separate gate electrode structures overlying each using alternative processes, each generally involving two photolithography steps, are set forth.
Abstract:
In a method for manufacturing a semiconductor non-volatile SNOS or SONOS memory device having a gate structure which includes a gate oxide layer (11) provided on a semiconductor substrate (16), a nitride layer (12) provided on the gate oxide layer (11) and a polysilicon gate electrode (14) overlying the nitride layer (12), the device is annealed in hydrogen, in an annealing vessel (40), typically for 15-60 minutes at 600-1100`C.
Abstract:
A memory system (10) having a word-addressable memory (12, 14) and bit changing circuitry (35) for changing or updating individual bits within the data words stored in the memory. The memory includes a primary memory (12) and a copy memory (14). The copy memory (14) stores duplicates of the data words stored in the primary memory (12). The bit changing circuitry (35) receives a word having a bit to be changed from the copy memory (14) and returns the word, including the changed bit, to both the primary memory (12) and copy memory (14). The memory system may constitute a parity memory system in a data processor.
Abstract:
Enciphering/deciphering apparatus having two pseudo-random bit generators (16, 28) which are cross-coupled in the enciphering mode by logic circuitry (10, 14, 18, 20, 22, 26). An input data signal is directed to the input of each bit generator by a pair of summing devices (18, 20). The data signal is also logically combined with the output of each bit generator by a second pair of summing devices (30, 32). In the deciphering mode the pseudo-random bit generators are connected in a feedback configuration by logic circuitry (12, 14, 18, 20, 24, 26). The to-be-decoded signal is directed to the input of each bit generator by the first pair of summing devices (18, 20). The to-be-decoded signal is also logically combined with the output of each bit generator by the second pair of summing devices (30, 32) to provide the decoded signal.
Abstract:
A diazo film developing apparatus and method in which an exposed diazo film (36) is moved through a heated developing chamber (16) and is contacted by ammonia vapor which develops the film. Aqueous ammonia is fed into a separation chamber (20) connected with said developing chamber (16) and the ammonia is separated from the water by heating and introduced into the developing chamber (16). A thermal control means (62) is provided between said developing chamber (16) and said separation chamber (20) to maintain a temperature differential therebetween, said separation chamber (20) having a temperature lower than the temperature of the developing chamber (16). In the preferred embodiment the separation chamber is in the form of a cavity or trough in the bottom of the developing chamber (16).
Abstract:
A method and apparatus for verifying the identity of a person by first establishing and storing in a storage unit (116) a reference vector based upon predetermined characteristics derived from a number of handwritten signature samples. In the verification mode, a person whose identity is to be verified enters an identification number on a keyboard (144) thereby selecting his reference vector from the storage unit (116). The person then writes his signature on a signature pad (108), the written signature generating an analog waveform which is digitized, the digitized representation then being compressed. Thereafter, parameters dependent on Haar coefficients and on physical features are computed to provide a vector which is compared with the reference vector utilizing a comparison threshold which has been predetermined for that person.
Abstract:
A memory system comprises a pair of RAM buffer memories (22, 24) coupled to a CCD main memory (20) to provide high-speed memory access to the memory by a processing means. Each buffer memory has stored therein a page of data transferred from the CCD main memory. Comparison means (76, 78) included in the system compares the page address in a memory request with the page address, located in address registers, of the data stored in the buffer memories. If a comparison is found, the designated buffer memory is accessed for a read/write operation at the addressed memory location. If no comparison is found, circuits (72, 92, 134) using the requested page address transfer the page in which the requested address is located from the CCD main memory to a RAM buffer memory for access by the processing means; the buffer memory to which the page is transferred is the buffer memory that was not accessed in the immediately preceding memory request. If a write operation had occured on a page stored in the buffer memories, the altered page is transferred back to the CCD main memory before a new page of data is transferred to the buffer memory.
Abstract:
A method of recording data on an optical disc (10) having already recorded thereon one or more bands or segments of data each comprising a plurality of tracks and having a portion for producing an end-of-band signal indicative of the last recorded track the respective band. After sensing the end-of-band signal of the last recorded band, a relative radial movement is brought about between a recording means and the disc (10) by a distance corresponding to a predetermined number of tracks to produce a gap (18) between the last recorded band and the next band to be recorded and recording of the next band is then commenced. The distance is determined experimentally with a view to compensating for the eccentricity errors likely to be encountered in practice when recording on an optical disc (10) at a predetermined density.