A redesigned digital filter is disclosed which uses fewer of the costly multiplier components than conventional digital filters. Samples of the input signals are processed alternately using a multiplier common to two successive samples and a correction term is generated using successive pairs of input samples. The generation of the correction term requires fewer than one-half of the multiplier circuits used in a conventional filter so that the overall circuit saves about one-fourth of the multip...

A digital circuit is formed by transistors operable in an unsaturated state. A pair of first transistors are connected in a differential relationship with their emitters commonly connected. A pair of second transistors are also connected in a differential relationship and have their emitters connected in common and their collectors connected respectively to the bases of the first transistors. At least one of the first transistors is connected to the bases of the second transistors to form a feed...

A digital magnetic compass in which an optically sensible code element is employed as the compass rotor in conjunction with an array of photosensors to provide a plurality of digital electrical signals representative of compass position. The code element, typically a disk, is mounted for rotation in association with one or more magnets within an enclosure filled with a damping liquid, this enclosure being supported within a liquid filled housing by means of an internal gimbal assembly also dispo...

A digital timepiece is disclosed in which characters to indicate the minutes of the first digit and of the second digit and of the hour are formed by light transmitting film in drums; a plurality of drums are disposed in parallel and driven intermittently by a synchronous motor and a source of light in each drum directly irradiates the characters.

A digital flowmeter provides axially spaced transducers clamped on the exterior of a fluid conducting conduit. Sonic energy from the first transducer is applied through the pipe and into the medium and the time taken to reach the second transducer is counted. Sonic energy is then sent from the second transducer, through the medium, to the first transducer and the time taken to reach the first transducer is counted and subtracted from the first time. This difference is then displayed as a functio...

The digit-capacity of display units is made smaller than that of a register storing the numeral information for indication to reduce the size and assembly cost of the apparatus equipped with the display units. To display the whole of the numeral information stored in the register, the numeral information is divided with reference to the decimal point thereof into a plurality of groups, each group being a digit number equal to the digit-capacity of the display units, and then the numeral informat...

A segment type digital indicator, which displays flat and easy to read large dotted figures clearly in daylight, as well as at night, includes a masking plate having dotted apertures, segment shutter plates having vertically disposed arm members and mounted immediately behind the masking plate, a reflecting plate mounted immediately behind the segment shutter plates, and operating means connected to the vertically disposed arms of the segment shutter plates to operate the segment shutter plates ...

A digital clock having time display drums, shift pinions to regulate these time display drums, an electric motor, a plurality of gears for transmitting the rotating movement of the electric motor to the time display drums and timer members related to the rotating movement of the time display drum, these components being attached to a frame, in which a plastic mounting and a plastic holding plate, these being a side wall of the frame and arranged in parallel each other, are provided with a plural...

A printer for printing in alpha-numeric character form information from a digital source available in the form of a video-type signal representative of alpha-numeric characters corresponding to the digital information. The printer utilizes a high speed rotating spindle having at least one spiral electrical conductor on its periphery and means for forming a mark on a continuous sheet of paper in response to an electrical signal applied to the spiral conductor. The paper is moved past the spindle ...

A -n coefficient digital filter in which the sample y.sub.i of the filtered signal at instant i is derived from the sum ##EQU1## WHERE A.sub.K ARE COEFFICIENTS DEFINING THE FILTER CHARACTERISTICS AND THE X.sub.I.sub.-K ARE THE SUCCESSIVE PRECEDING DATA SAMPLES, SAID FILTER INCLUDING A FIRST SET OF MEANS FOR COMPUTING A VALUE ##EQU2## A SECOND SET OF MEANS FOR COMPUTING A VALUE ##EQU3## A THIRD MEANS FOR PROVIDING A CONSTANT VALUE W.sub.I OBTAINED BY ADDING TOGETHER THE PRODUCTS OF PAIRS OF CONSE...