Showing papers by "Sony Broadcast & Professional Research Laboratories published in 1970"

Recording and reproducing system for color video signal

Abstract: In recording a composite color video signal consisting of a luminance signal and a modulated chrominance signal having its frequency band contained within the luminance signal band, a carrier is frequency modulated with the luminance signal separated from the composite signal, the modulated chrominance signal separated from the composite original is frequency converted to have a frequency band juxtaposed to the lower limit of the bandwidth of the frequency-modulated luminance signal, and the latter is combined with the thus converted chrominance signal and with a pilot signal having a still lower bandwidth to provide a combined signal which is magnetically recorded. Upon magnetic reproduction of the combined signal thus recorded, the pilot signal, frequency-modulated luminance signal and converted chrominance signal are separately extracted from the reproduced signal, amplitude variations of the pilot signal are detected to control the amplitude of the converted chrominance signal which is reconverted to substantially its original frequency band by reference to the pilot signal, and the frequency-modulated luminance signal is demodulated and combined with the reconverted modulated chrominance signal to provide the composite color video signal.

White balance control system

Abstract: A white balance control system which has two amplifiers for red and blue video signals, two memory circuits for selecting the gains of the amplifiers in response to signals applied thereto, and two comparator circuits for comparing a green video signal with the red and blue video signals, respectively. The compared signals are respectively applied to the memory circuits selectively.

Recording and reproducing apparatus using magnetic tape cassette

Abstract: In an apparatus for recording and/or reproducing signals on a magnetic tape contained in a cassette, a cassette-handling mechanism includes a cassette holder into which a cassette is slidably insertable while actuating devices that load first, second and third springs. Upon the full insertion of the cassette into the holder, the first spring force is released to shift or depress the holder and the cassette therein from an elevated position to an operative position with respect to tape-driving elements and a recording and/or reproducing head. Upon actuation of an ejection control, the force of the second loaded spring is released to return the holder and the cassette therein to the elevated position of the holder, whereupon the force of the third loaded spring is automatically released to slidably propel the cassette substantially out of the holder.

Television signal recording system with color information recorded on a low frequency carrier at reduced amplitude with respect to the luminance information

Abstract: A standard color television signal which has a luminance signal component and at least two chrominance signal components is recorded with one head on a magnetic tape or other medium. The chominance signal components are combined alternately into a line sequential chrominance signal, and the luminance signal component and line sequential chrominance signal are modulated on separate carriers having relatively high and low carrier frequencies, respectively, to form two independent modulated carriers which are mixed or combined to constitute a single channel composite signal recorded by the one head and in which the carrier modulated with the line sequential chrominance signal has an amplitude of from one-fifth to one-third the amplitude of the carrier modulated with the luminance signal component. During reproduction, the reproduced composite signal is separated into the luminance signal component and the line sequential chrominance signal, and the latter is separated into the two chrominance signal components with the aid of a delay line.

Counter for a tape recorder/playback mechanism

Abstract: A tape cassette for use with a video tape recorder having a counter mounted in the cassette to indicate to the user, or other concerned parties, the amount of time the material which is recorded on the magnetic tape within the cassette has been used. The counter can only operate when it is properly mated with a member on the VTR chassis and a ratchet and pawl mechanism in which indicia is printed on the ratchet.

Recording and reporducing system for color video signal

Abstract: A composite color video signal may be magnetically recorded by separating the luminance and chrominance signals, and frequency modulating the former on a carrier, and frequency shifting the latter such that the bands of the frequency-modulated luminance signal and the frequency-converted chrominance signal are substantially not overlapping. The two signals are then combined and magnetically recorded with the frequency-converted chrominance signal added to the frequency-modulated luminance signal. To avoid a beat interference between the second harmonic of the carrier of the frequency-converted chrominance signal and the luminance signal, the system is designed to interleave the second harmonic of the carrier of the frequency-converted chrominance signal with the luminance signal. By avoiding the beat interference the amplitude of the frequency-converted chrominance signal relative to the amplitude of the frequency-modulated luminance signal can be made large with resulting good signal-to-noise ratio of the chrominance signal.

Cathode ray tube having shadow mask apertures aligned along curved horizontal and vertical lines

Abstract: In a cathode ray tube having a curved phosphor screen, a shadow mask having bored therein apertures and electron beam generating means for generating three in-line electron beams aligned in a horizontal direction, the apertures of the shadow mask are aligned along barrel-shaped lines extending in a horizontal direction and are aligned along pin-cushioned lines extending in a vertical direction and the diameter distribution of the apertures is arranged so that the distribution of the electron beam transmission factor of the mask is concentric about the center of the mask.

Counter for a tape record-playback mechanism

Abstract: A counter for use with a video tape recorder to indicate visually the amount of time the magnetic tape in a cassette has been used. After a predetermined number of revolutions of a wheel, a lever is tripped which rotates a gear having indicia thereon indicating the amount of time elapsed during which the magnetic tape was played.

Control system for moving vehicle along a predetermined path

Abstract: A control system for directing a movable vehicle along a predetermined course has a transversely magnetized guiding element extending along the course, a plurality of dual-gap magnetic flux responsive heads spaced apart on the movable vehicle in the direction of movement of the latter and each being arranged so that the direction across the gaps of the head extends substantially transversely with respect to the magnetized guiding element, and circuits connected with the heads to provide control signals indicative of deviations of the vehicle from the course and by which steering of the vehicle is controlled for maintaining the vehicle on the course. Additional magnetic heads may be provided on the vehicle to detect the magnetic fields of associated magnets arranged at selected locations along the course, and circuits are connected to such additional heads to provide respective control signals by which the speed of movement and/or stopping of the vehicle are controlled.

Electron type fluorescent display device with planar adjacent control electrode

Abstract: An electron tube having at least two electrodes and a cathode disposed within an evacuated envelope. One of the electrodes is spaced generally transversely with respect to the electro beam path from the cathode to the other electrode. The electrode which is spaced from the electron beam path is used to control the cathode current. Means are provided to couple various voltages to the respective electrodes to accomplish the desired control. The anode electrode may have a phosphor coating thereon so as to glow when bombarded by an electron beam from the cathode. Accordingly, an electron tube of this type is adaptable to display units for the display of letters, symbols, numerals and the like. In one form of the invention, the anode electrode and the control electrodes are arranged in a predetermined pattern to cause elemental areas of the anode electrode to glow and produce a display.

Magnetic recording and/or reproducing system having guide pins mounted on independently rotating plates for withdrawing tape from cassette

Abstract: In a tape recording and reproducing device adapted for use with magnetic tape cassettes and having a rotary magnetic head for recording and reproducing signals on the tape while the latter is wrapped about a guide drum, an apparatus is provided for withdrawing the tape from the cassette and guiding the tape into contact with the guide drum for skewed scanning by the head or heads. The tape guiding apparatus includes first and second tape guide members mounted for movement on the device along a generally arcuate path about the periphery of the drum from a first station adjacent the cassette to a second station remote from the cassette, and each of the guide members includes a guide pin or pins for engaging the tape within the cassette and guiding the tape about the guide drum. The guide pin on the first guide member, when located at the second station, holds the tape in wrapped engagement with the guide drum, and the guide pin, on the second guide member guides the tape along a return path remote from the drum back to the cassette. The first and second guide members are operably connected for relative movement therebetween during movement from the first to the second station.

Method of making a luminescent diode

Abstract: A method of making a luminescent diode comprising providing gallium phosphide substrate having an impurity donor which can be sulfur or tellurium with a melt of gallium-gallium phosphide solution, heating the substrate and said melt to a temperature range to render the melt in solution, and passing a carrier gas of hydrogen containing hydrogen sulfide and ammonia over the melt and substrate so as to grow an epitaxial layer on the substrate from the melt. The method further includes producing a zinc vapor which is supplied over the substrate as the epitaxial layer is grown, so as to produce luminescent diodes having a very high light emitting efficiency.

Control circuit for driving an alternating current motor at a speed corresponding to the magnitude of a control signal and for braking the motor when the signal falls below a certain value

Abstract: An alternating current motor having main and auxiliary windings is provided with a control circuit by which circuit flows in the windings produce a rotating magnetic field for driving the motor so long as control signals applied to the circuit are above a predetermined value and the speed of rotation of the motor is made dependent on the magnitude of the control signals. When the control signals fall below the predetermined value, the current flows in the windings are altered by the control circuit to provide a retarding magnetic field, which may rotate in opposition to the rotating magnetic field for normal driving of the motor, whereby to exert a braking action.

Shadow mask having apertures at intersections of barrel-shaped horizontal and pin-cushion-shaped vertical lines

Abstract: In a cathode ray tube having a curved phosphor screen, a shadow mask having apertures therein and electron beam generating means for generating three in-line electron beams aligned in a horizontal direction, the apertures of the shadow mask are aligned in the form of barrel-shaped lines extending in a horizontal direction and are aligned in the form of pin-cushioned lines extending in a vertical direction. The apertures are circular at the central portion of the mask but become gradually elliptic as the peripheral portion of the mask is approached from its center, and the longer axis of the elliptic apertures are inclined at predetermined angles to a horizontal direction corresponding to their particular locations.

Graphic symbol display system including plural storage means and shared signal converter

Abstract: A display system with a plurality of electric indicator devices having a plurality of circuits for memorizing binary digit signals supplied thereto, the number of such memorizing circuits corresponding to that of the indicator devices. Included is a circuit common to all the memorizing circuits for converting the memorized binary digit signals into code signals for display. Circuits are provided for applying the binary digit signals from each of the memorizing circuits to the converting circuit sequentially in a time divisional manner. A plurality of circuits is connected between the converting circuit and the indicator devices, respectively, each of the last-mentioned circuits being supplied with the code signals from the converting circuits in a time divisional manner to memorize them and to apply them to the respective indicator device. The system also includes a circuit for activating the indicator devices.

Electron beam deflection system utilizing a yoke having a plurality of separate windings toroidally wound theron

Abstract: In a color television receiver having a color cathode ray tube and an electron beam deflection yoke receiving the neck portion of the tube for deflection the electron beams in the tube to scan its color phosphor screen, the yoke has a plurality of separate windings toroidally wound in a generally axial direction and in a predetermined spaced relation about the periphery of an annular magnetic core, and the individual windings are interconnected to form three groups of windings, two of which are respectively connected to a horizontal deflection current source and to a vertical deflection current source and the third of which is connected to both the horizontal and vertical deflection current sources whereby the windings establish horizontal and vertical magnetic fields within the yoke and the cathode ray tube for accurate scanning of the screen by the electron beams.

Color video signal recording and reproducing apparatus with pilot signal for automatic color control

Abstract: In a color video signal recording and reproducing apparatus that records and reproduces a pilot signal along with the color video signal, so that any amplitude fluctuating component of the reproduced chrominance signal resulting from the recording and reproducing operations has its counterpart or corresponding variation in the pilot signal, the reproduced modulated chrominance signal and pilot signal are mixed to provide a mixed signal which is subjected to amplitude control, the pilot signal is separated from the amplitude-controlled mixed signal, variations in the pilot signal thus separated are detected, and such detected variations are employed for determining the amplitude control exerted on the mixed signal, whereby to diminish undesired variations in the chrominance signal derived from the amplitude-controlled mixed signal

Automatic gain control system for television cameras

Abstract: An automatic gain control system for television camera which has an amplifier circuit and a memory circuit for selecting the gain of the amplifier in response to a signal applied thereto The memory circuit stores the signal selectively applied thereto with a manual switch

Solid state target electrode for pickup tubes

Abstract: A target using a diode array for pickup tubes which consists of a semiconductor substrate including on one surface thereof an array of regions, defining PN junctions with the major portion of the substrate formed from a vapor-deposited layer of the same conductivity type as the substrate and having a plurality of polycrystalline regions of low resistivity of conductivity type opposite to the substrate.

Magnetoresistance element and method of making the same

Abstract: A magnetoresistance element comprising a semiconductor wafer having a high resistivity and having a pair of junctions formed on one surface of the wafer which are capable of injecting carriers, a portion of reduced thickness formed on the other side of the wafer and a recombining area having a high rate of recombination formed in said reduced cross-sectional portion such that the element when subjected to a magnetic field exhibits a non-linear response. The method of making the element on the semiconductor wafer is also included.

Tape recorder with pivotally mounted cassette loading plate having rotable tape guiding fingers

Abstract: A loading loading plate having longitudinally rotatably tape tape buiding fingers thereon in the loading the load plate is pivotally mounted on the chassis of a tape recorder. The loading plate is linked to a cassette holder by a substantially ''''shaped lever shaped lever which permits the loading plate to pivot in response to pivotal cassette of the cassette holder. The cassette holder is pivoted to energize the tape recorder and the loading plate is pivoted therewith so as to place the tape guiding fingers behind the tape in the cassette where the tape can be withdrawn from the cassette.

Transistor protective circuit

Abstract: A protective circuit for a transistor which limits the maximum allowable collector power loss so as to prevent the transistor from being destroyed is disclosed. A second transistor is connected in circuit with the main transistor to control the power loss in the main transistor. In one embodiment the protective transistor has a linear response and in another embodiment the protective circuit has a different slope in different operating ranges.

Method of making a magnetic head

Abstract: A MAGNETIC HEAD HAS A GAP SPACER BETWEEN MAGNETIC CORE MEMBERS THEREOF, WHICH SPACER IS CONSTUTUTED BY AT LEAST ONE LAYER OF A NON-MAGNETIC METAL OXIDE FORMED OVER A PROTECTIVE LAYER, SUCH AS SILICA DIOXIDE, ON A GAP-DEFINING SURFACE OF THE MAGNETIC CORE MEMBERS. THE METAL OXIDE LAYER IS FORMED OVER THE PROTECTIVE LAYER BY HEATING ON THE LATTER AN ACID SOLUTION OF A NON-MAGNETIC METAL HALIDE OR A SOLUTION OF AN ORGANIC METAL SALT, DURING WHICH HEATING THE PROTECTIVE LAYER PREVENTS OXIDIATION AND ETCHING OF THE UNDERLYING GAP-DEFINING SURFACE. D R A W I N G

Color television camera indexing apparatus

Abstract: A color television camera utilizing a vidicon tube that has a filter in the form of alternate stripes for the primary colors red, green and blue, a pair of electrodes for each set of three stripes and a photoconductive layer, an alternating voltage is applied to the electrodes to provide a predetermined pattern on the surface of the photoconductive layer in the form of an index signal which is overlapped on the photoconductive layer with the image to be reproduced. The composite signal on the photoconductive layer of an index signal and a color video signal is fed through the same terminals that applied the reference alternating voltage to the electrodes to a circuit which separates the color video signal from the index signal. The index signal is then applied to three demodulators to obtain the color video signals.

Process of electrodepositing magnetic metal layer on electrically conductive substrate

Abstract: A process of electrodepositing a magnetic metal layer on an electrically conductive substrate in an electrolytic cell containing one salt of the magnetic metal and a fine ferrite powder. The electrodeposited magnetic metal layer formed on the substrate of the cathode contains a fine ferrite powder dispersed therein.

Comb filter circuit

Abstract: A comb filter circuit for separating luminance and chrominance signal components from a composite color television signal transmitted with the luminance and chrominance signal components in a frequency interleaved relation, comprises a delay means for delaying the composite color television signal by one horizontal scanning period and a bridge circuit connected to the delay means and consisting of four sections of substantially equal impedance. To the bridge circuit the delayed and non-delayed composite color television signals are suppled and therein the addition and the subtraction of both signals are performed, so that the luminance and chrominance signals are derived separately from the output terminals of the bridge circuit.

Negative impedance semiconductor device with multiple stable regions

Abstract: An electrical circuit utilizing a semiconductor device to provide a novel negative impedance characteristic. The semiconductor device has, for example, four independent high impurity concentration regions formed on a semiconductor substrate, two of which regions inject carriers of opposite polarities into said substrate and another two of which regions are applied voltages so that junctions formed between said substrate and themselves are reversely biased to establish the desired negative impedance characteristics.

Magnetic tape cartridge containing engaging means for rotary head

Abstract: A magnetic tape recording and reproducing device having a tape guide drum and a rotary magnetic head for recording and reproducing signals on a tape wrapped about the drum is provided with a magnetic tape cartridge adapted to be removably mounted on the device and having a housing containing the tape and an assembly by which, when the cartridge is removed from the device, a loop of the tape is securely supported and, when the cartridge is mounted on the device, such tape loop is released to engage in wrapped relation about the guide drum for recording or reproducing operations.

Amplifier having improved load protective circuit

Abstract: A load protective circuit for an output stage of an amplifier comprising means for detecting an undesirable DC voltage at the output of the amplifier and means for producing a control signal in response to the output of the detecting means for controlling a switching means and thereby remove the undesirable DC voltage from the output of the amplifier.

Signal control circuit

Abstract: A transistorized signal control circuit including a pair of transistors which are connected between both ends of a DC power source in the same conductive direction and a plurality of series-connected resistive elements between a couple of corresponding respective electrodes of the transistors. Input terminals are connected to the other couple of corresponding respective electrodes of the transistors and output terminals are connected to connecting points between the series-connected resistive elements. A signal supplied from the input terminals and derived from the output terminals is controlled its amplitude without being changed its DC voltage level.