Method and means are disclosed for rapidly tuning a laser over a large number of wavelengths. The means of the present invention includes first and second reflecting means which define the optical resonating cavity of a laser, and further includes a dispersive means adapted to sequentially select and direct one and only one of the wavelengths of light from the beam emitted by a laser's amplifying ...

PURPOSE:To prevent missing or theft of a radio equipment and also to attain the request of paying of unpaid charge by stopping a reception function when a prescribed signal is received after a selective call signal is received and allowing the equipment to recognize it as sound or visual information. CONSTITUTION:A reception signal from an antenna 1 is demodulated after being amplified at a radio ...

A compensation method and apparatus for a roughly compensated RC attenuator using fixed resistors and fixed capacitors. Any difference of the high frequency attenuation ratio from the low frequency of DC attenuation ratio is detected and corrected by using multiplier for increasing or decreasing high frequency components at the output from such RC attenuator, thereby allowing digital or remote com...

PURPOSE:To attain transmission and recording of digital information data with high speed and reliability by giving a decoding algorithm so as to use it for error control in decoding product codes of a minimum distance. CONSTITUTION:In decoding a product code having a minimum distance 2t, the decoding in the column direction is conducted for (l+1) sets of codes, and a higher priority is placed to a...

A processor-assisted system helps persons with speech or hearing handicaps communicate with any telephone caller having an ordinary tone generating telephone. With minimal training, the caller can communicate with the handicapped person using a one key per letter technique for spelling out words. Received keypad sequences are decoded by the processor and the decoded message is presented on a video...

In a method for copying retouch in color picture reproduction, color values are initially acquired by image-point-by-image-point trichromatic color picture scanning and digitization. The color values are deposited in a storage medium and are addressable by image point coordinates. With the coordinate pen of a coordinate acquisition means, the retoucher first marks a read point within a first image...