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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 4596957 | Amplifier system switchable between two amplifying operations An amplifier switchable between a dual-channel amplifier and a BTL amplifier includes first and second amplifying circuits having a non-inverting input, an inverting input and an output, a first input terminal receiving a first input signal and applying i... | 06/24/1986 |
| 4476427 | Pulse signal processing circuit having a protection circuit against over-current breakdown For protection of an output switching transistor used in a pulse signal output circuit, the present invention provides a first detector for detecting over-current flowing through the output switching element, a second detection circuit for producing a det... | 10/09/1984 |
| 4442518 | Channel switching system for use in a digital communication system A channel switching method and system for a digital communication system including a repeater station linked with first and second stations and including first and second regular channels and a standby channel in each direction between the repeater statio... | 04/10/1984 |
| 4425548 | Digital signal processing circuit A digital data signal is distorted by means of a low or high pass filter. Quantization of such a signal in accordance with extracted clock pulses will result in a high error rate if a fixed quantization level is utilized due to attenuated voltage swings a... | 01/10/1984 |
| 4388009 | Cooling system for a line printer A line printer is provided with at least one cross flow fan positioned above the hammer actuators for directing an air flow across the actuators for cooling the same. The exiting heated air is ventilated to the outside and may pass through sound absorbers... | 06/14/1983 |
| 4354273 | ADPCM System for speech or like signals In an adaptive differential pulse code modulation (ADPCM) system for frequency band compression of speech or like signals, the coefficient of the synthesis filter in both the transmitter and receiver is varied in accordance with the normalized error e | 10/12/1982 |
| 4325763 | Method of manufacturing ceramic capacitors A ceramic capacitor is prepared by corting an electrode paste on the opposite surfaces of a green ceramic body. The electrode paste contains an inorganic binder having the same composition as the green ceramic body. Then the green ceramic body is sintered... | 04/20/1982 |
| 4306497 | Dot matrix type printer An improved dot matrix type printer including a carriage mechanism for a printer head having a plurality of printer elements aligned immediately before a platen adapted to carry a sheet of paper to be printed and along a direction parallel to the axis of ... | 12/22/1981 |
| 4303303 | Mechanical optical switching device A mechanical switch for light transmitted over optical fibers has one input collimating and a pair of output converging lenses. One optical fiber transmits incoming light, bearing information signals onto said input lenses. A first triangular prism path n... | 12/01/1981 |
| 4288753 | Muting circuit with operational amplifier An FM muting circuit has a common input terminal and uses an operational amplifier which has a pair of input terminals. The two amplifier input terminals are coupled to the common muting circuit input terminal. An electronic switch is connected between gr... | 09/08/1981 |
| 4285570 | Light branching device A light branching device includes a light-focusing transmission body having a refractive index which decreases in proportion to the square of the distance from the plane of its optical axis, and two end faces perpendicular to the optical axis and a substa... | 08/25/1981 |
| 4284859 | Adaptive electronic hybrid circuit An adaptive hybrid circuit for connecting two-wire and four-wire telephone transmission lines to minimize singing, oscillation or echoes due to impedance mismatch. The circuit comprises a variable impedance circuit connected between the two-wire and four-... | 08/18/1981 |
| 4218665 | Band-pass filter A bandpass filter is disclosed which includes a low-pass filter and an analog delay circuit in which the delay time is set by a clock signal. THe analog delay circuit samples the voltage of the low-pass filter capacitor and delays the sampled voltage acco... | 08/19/1980 |
| 4218639 | Tape tension control for tape recording and/or reproducing system A purely electrical tension control system utilizing the characteristics of a shunt motor coupled with the supply reel. In a recording or reproducing mode, the reel drive motor is forced to rotate in a direction opposite to its normal direction of rotatio... | 08/19/1980 |
| 4217783 | Magnetoresistive pressure-sensing device for automotive electronic engine control systems A pressure sensor comprises essentially magnetoresistive elements formed on a diaphragm serving as a stress magnifier. The diaphragm may be made, for example, of glass in a thickness of 0.5 millimeter, and the magnetoresistive elements can be formed there... | 08/19/1980 |
| 4218705 | Delay compensator for a television signal Delay compensation apparatus for minimizing the delay differences between a video signal transmitted through a plurality of frame synchronizers, which delay the video signal, and a normally undelayed audio signal, the audio and video signal making up a co... | 08/19/1980 |
| 4218710 | Digital video effect system comprising only one memory of a conventional capacity In a digital video effect system, only one one-frame RAM (30) produces a mixed and phase-locked signal (14) for n individually synchronized input television signals (11, 12) when read by horizontal and vertical address signals (48, 49) derived from a refe... | 08/19/1980 |
| 4218711 | Special effect device for electronically accomplishing a gradual scene shift In an electronic special video effect device, first and second digital video signals (DF and DS) derived during a keying interval of time from two television signals (VA and VB) between the beginning and a switching instant of each p... | 08/19/1980 |
| 4218700 | Luminance/chrominance separating apparatus having a spatial filtering effect Luminance/chrominance separating apparatus in which a luminance signal and chrominance signal are extracted from a composite color television signal by a comb filter. A low frequency signal component is extracted from the chrominance signal and passed thr... | 08/19/1980 |
| 4215374 | Encoding device comprising predictors for thinned and unthinned patterns For selectively carrying out predictive encoding of an original pattern of a first tone on a background of a second tone and a thinned pattern having, in effect, the first tone on its background corresponding to the second tone, a device comprises a predi... | 07/29/1980 |
| 4215417 | Two-term vector multiplier A two-term vector multiplier for calculating Ax+BY and useful in FFT and digital filter circuits is disclosed. The variables A and B are converted into standard type-minimal representation codes which are then operated upon to generate selection signals a... | 07/29/1980 |
| 4215415 | Recursive digital filter comprising a circuit responsive to first sum and feedback sign bits and second sum sign and integer bits for detecting overflow in the second sum In a recursive digital filter for dealing with data words given by two's complement representation in a common word format comprising a sign bit, an integer bit, and a predetermined number of fractional bits, an overflow detect and correct circuit is supp... | 07/29/1980 |
| 4215375 | Digital facsimile transmission system for screened pictures A digital facsimile system suitable for the facsimile transmission of newspaper pages having screened picture portions and printed character portions is disclosed. The transmitter receives a digitized facsimile signal which is a train of pel codes formed ... | 07/29/1980 |
| 4215369 | Digital transmission system for television video signals A digital transmission system for television video signals of the type which comprises a transmitter and a receiver, the transmitter having a plurality of input terminals for receiving respective television video signals to be transmitted, a plurality of ... | 07/29/1980 |
| 4200890 | Digital video effects system employing a chroma-key tracking technique A chroma-key tracking system for electronically compressing a television picture to predetermined dimensions and for moving the compressed picture to a specified area on the television screen where the compressed picture is inserted into a second picture ... | 04/29/1980 |
| 4200191 | Container for storage or transportation of semiconductor chips A container for semiconductor chips is disclosed. The container includes an annular ring having a first diameter and an annular lower casing having a second diameter, greater than the first diameter. The annular lower container houses the annular ring. A ... | 04/29/1980 |
| 4179800 | Printed wiring board comprising a conductive pattern retreating at least partly in a through-hole In a printed wiring board having an outwardly flaring through-hole, a conductive pattern is formed on the inwardly directed surface of the hole so as to reach a principal surface of the board only at that circumferential portion of the hole where the patt... | 12/25/1979 |
| 4167653 | Adaptive speech signal detector An adaptive speech signal detector for use in a 4-wire telephone channel performs an adaptive threshold value setting operation depending on the channel noise level on a transmitter-side channel to detect a speech signal present at the transmitter. The ad... | 09/11/1979 |
| 4167701 | Decoder for error-correcting code data An error correcting decoder is disclosed which blocks correction of bits received during periods of relatively high signal intensity levels. A syndrome register and decision circuit provide error correcting bits for all bits which the sequence of input da... | 09/11/1979 |
| 4160131 | Electronic key telephone system An electronic key telephone system is disclosed that provides a plurality of telephone features and functions, while only requiring a four-wire line between the central equipment and each key-set telephone (KST) and a two-wire line between the central equ... | 07/03/1979 |
| 4158105 | Clock extraction device for double-binary phase-shift keying system A circuit for extracting a clock signal from a double-binary phase-shift keying system is disclosed. The carrier wave form is regenerated at the receiver from the phase-shift keyed (PSK) signal input. The regenerated carrier wave is frequency doubled and ... | 06/12/1979 |
| 4146838 | System for detecting by a first pilot and a group of second pilots correlated to the first a frequency and/or phase difference between relayed carriers A plurality of pilot signals having predetermined relations are used to remove a phase-frequency difference introduced into transmission signals by one or more repeaters in a high frequency radio link. The pilot signals are also used to compensate for cro... | 03/27/1979 |
| 4131927 | A.C. power supply circuit with surge current suppression The current surge, normally associated with the initial application of a nominal A.C. current to an inductive load, is prevented by preventing the magnetic core of the inductive load from being driven into saturation. Initially, the current is half wave r... | 12/26/1978 |
| 4131911 | Hermetically sealed opto-electrical semiconductor device A hermetically sealed opto-electrical semiconductor device includes an opto-electrical semiconductor element centrally disposed in an envelope having at least two openings through which light beams are to pass, with flat plates made of a transparent mater... | 12/26/1978 |
| 4118776 | Numerically controlled machine comprising a microprogrammable computer operable with microprograms for macroinstructions and for inherent functions of the machine With a microprogrammable computer of a numerically controlled machine, macroinstructions are executed in response to a first microprogram. The computer makes the machine carry out its inherent functions, such as interpolation, in response to a second micr... | 10/03/1978 |
| 4118660 | Automatic machining system An automatic machining system incorporating all the features of a numerically controlled type machine while eliminating the need for paper tapes. The tool receiving head incorporates means for identifying the moment of contact between tool and work piece,... | 10/03/1978 |
| 4118672 | Attenuation equalizer having constant resistance An attenuation equalizer, having a constant resistance is comprised of a distributed constant line having a given impedance and electrical length connected to both the input and output terminals of the equalizer, and an additional constant line having a g... | 10/03/1978 |
| 4110663 | Plasma display panel driving circuit including apparatus for producing high frequency pulses without the use of clock pulses In a circuit for driving a plasma display panel, a blocking oscillator produces pulses varying between a positive and a negative voltage. Transistors controlled by first selection signals selectively supply first electrodes of the panel with either the co... | 08/29/1978 |
| 4110706 | Phase synchronizing circuit A synchronizing circuit for reproducing a synchronizing carrier wave from a received N-phase (N=2n, n being a positive real integer where n ࣙ1) PSK modulated carrier wave and employing a code converter circuit for adjusting the phase states o... | 08/29/1978 |
| 4109161 | Memory circuit with protection circuit A memory circuit with protection circuit having particular application to MOS-IC memories is disclosed. The protection circuit prevents the memory from being damaged by an undesirable turn-on or turn-off sequence of main and substrate voltage supplies or ... | 08/22/1978 |
