Abstract: A "freeze frame" video disc player is described for playback of records having an integral number of TV signal frames per circular information track or per convolution of a spiral information track. The player includes a stripe of magnetic material secured to the periphery of the player turntable and magnetic transducer apparatus for repeated recording and recovery of the frozen frame to and from the magnetic stripe.

Abstract: A signal pickup device in a rotary recording medium reproducing apparatus comprises a cantilever having at a free distal end thereof a reproducing element for reproducing recorded signals from tracks of a rotary recording medium, a permanent magnet magnetized in an axial direction of the cantilever and fixed to the cantilever at proximal end thereof, an elastic support member extending perpendicular to a longitudinal direction of said tracks and supporting the proximal end of the cantilever so that the cantilever is rotatable, accompanied by elastic deformation of the elastic support member, and tracking control coil device supplied with a tracking control current to attract and repulse the permanent magnet to cause the cantilever to rotate. The reproducing element is displaced in a direction perpendicular to the longitudinal direction of the recording tracks of the rotary recording medium to tracks.

Abstract: An automatic power supply system for an acoustic apparatus having at least a cassette deck box and an audio box connected thereto, the deck box including an automatic power supply circuit and a tape/radio selector switch. A power source +B is supplied to the automatic power supply circuit or a relay control circuit of the audio box through the selector switch. The power source +B is further supplied to an audio amplifier through a relay which is adapted to be energized or deenergized by the relay control circuit.

Abstract: A hybrid circuit arrangement for a telecommunication system includes a transformer having a first and a second partial winding connected to a two-wire line. Third and fourth partial windings having a grounded junction are coupled to a receiving branch and a transmitting branch of a four-wire transmission line, respectively. A power supply bridge having a resultant supply resistor and a supply capacitor is inserted between the first two partial windings. The total inductance of these windings equals the supply capacitor value times the squared supply resistor value. An ohmic load resistor terminating the receiving branch has a resistance according to a specific relationship depending on the ratio of turns of the third partial winding divided by those of the first and second partial windings.

Abstract: An apparatus and method for recording and reproducing extended periods of video information on a longitudinal tape recorder without losing synchronism or image quality. The composite video signal, and synchronization signals extracted therefrom, are recorded in spatial registry on separate channels of a longitudinal tape recorder/reproducer. Vertical synchronization quality is maintained by recording on a channel capable of low frequency processing. Upon reproduction all synchronization, including mixing with supplemental video sources, is synchronized to the recorded master video synchronization and blanking signals. Video display at other than normal speeds is temporally synchronized from the slower tape speed. An X-Y monitor driven by vertical and horizontal sweep signals synchronized to the corresponding recorded synchronization signals generates a video presentation without repeated or omitted frames.

Abstract: Method and apparatus for replacing defective video information in a video signal line comprises sampling the video signal. Video information from the preceding in-phase pixel and the subsequent in-phase pixel are averaged to form a replacement pixel. Weighting coefficients are generated based upon the amplitude difference between the next adjacent and semi-adjacent pixels having the same subcarrier phase. These weighting coefficients are used to determine the amount of information contribution of the previous and subsequent pixels to arrive at the closest video approximation of the defective pixel. Three times color subcarrier frequency sampling is preferred.

Abstract: Disclosed is a record carrier for storage of digital data which is provided with a first periodic track variation having a period corresponding to a frequency at which the power spectrum of the digital signals is at a zero level. The first track variation produces a corresponding modulation of the radiation when scanned by a beam so that a clock signal can be derived from the detected radiation for synchronizing readout or recording of the data. The record carrier is further provided with a second periodic track variation in a direction transverse to the track direction having a period of the same order of magnitude, and preferably equal to the period of the first periodic track modulation. The second track variation produces a corresponding modulation of the beam which is detected and is used to generate to a tracking signal, the clock signal being used as phase reference signal for demodulation of the tracking signal.

Abstract: A multiple program input audio system including a plurality of input channels each adapted to provide an output program signal. Each channel comprises an actuator which compares a rectified program signal with a reference signal and generates an actuator output signal when the rectified signal is greater than the reference signal. A zero crossing detector also receives the program signal and generates an initiator pulse when the voltage of the program signal is zero. A master control switch receives the actuator output signal and generates a first master control output signal when pulsed by the initiator pulse and generates a second master control output signal when no signal is received from the actuator. A program switch receives the program signal and in response to the first master control output signal applies the program signal to an audio program buss where the program signals from all the channels are summed and applied to a digital attenuator.

Abstract: A stylus position sensor for a video disc player is described. An electrode secured in fixed relation to a movable stylus with respect to the stylus supporting carriage is disposed between first and second electrodes to form first and second variable capacitors therewith. The capacitance of the variable capacitors change in accordance with the motion of the stylus related electrode between the first and second electrodes. First and second varactor diodes are respectively serially connected with the first and second variable capacitors and poled in a complementary manner with respect to each other. The net capacitance at said third electrode comprises the parallel combination of the two respective series combinations of variable capacitor and varactor diode. The capacitance of the variable diodes is modulated by an AC signal potential coupled from a low impedance source through respective coupling capacitances.

Abstract: A composite information recording apparatus for recording on a recording sheet a composite image of an original and variable information as separate but substantially contiguous portions of the same recording sheet without overlap therebetween includes a copy board for supporting an original, a row of illuminating elements along an edge of the copy board portion at which the original is supported, and a data input device for entering variable information, such that after said entry of the variable information appropriate ones of the illuminating elements are lit to designate the position of the copy board portion at which the original should be placed for composite reproduction in order to avoid overlap with the variable information.

Abstract: An input gain control circuit for an audio signal recorder includes a first transmission path for compressing an audio signal supplied thereto and having a variable gain amplifier and a control circuit which supplies a control signal to the variable gain amplifier for varying the gain thereof, a second transmission path for transmitting the audio signal with substantially unity gain through a resistor thereof, and an adding amplifier for adding the compressed audio signal from the first transmission path and the audio signal with substantially unity gain from the second transmission path whereby the compressed audio signal is effectively transmitted for recording when the level of the audio signal is below a predetermined value and the audio signal with substantially unity gain is transmitted for recording when the level of the audio signal is above the predetermined value.

Abstract: A pickup cartridge comprises a magnetic circuit having an air gap, a coil wound on the magnetic circuit and a cantilever having a permanent magnet inserted in to the air gap. In this case, the magnetic circuit comprises a delta-shaped jointless core having the air gap at its vertical angle, and the coil is inserted through the air gap and fixed to the core.

Abstract: An exchange center is connected to telephone lines and a telephone and a data transmitter as terminal equipment are connected to the telephone lines. The data transmitter is actuated depending upon the polarity of DC voltage applied to the telephone lines. The telephone line is potentially opened by detecting the current of the telephone during the operation of the data transmitter. The impedance of the telephone line during the opening state is detected whereby the operation of the data transmitter is stopped by inverting the DC voltage applied to the telephone line and the telephone is predominantly communicated through the exchange center over the data transmitter.

Abstract: An apparatus for recording optically detectable information in a record carrier provided with information areas arranged in accordance with a spiral or concentric track pattern, which areas alternate with synchronization areas each containing the address of the associated information area. Recording is effected with a first modulated laser beam, while a second beam is projected after the first beam for reading the recorded information. The track pattern has previously been provided with a periodic track modulation of a frequency at which the power spectrum of the information to be recorded has a substantially zero value. The apparatus comprises a first and a second filter for filtering a signal corresponding to the track modulation out of the signal derived by detecting the first or second laser beam reflected or transmitted by the record carrier. In series with the second filter there is included a delay network from which a synchronization signal is available.

Abstract: A phonograph pickup cartridge of moving coil type comprises a cartridge body and a stylus assembly detachably mounted on the body. The body includes a housing which firmly holds a permanent magnet and a pair of pole pieces. Magnetic gaps are defined between the pair of pole pieces in the region of the lower opening of housing. The housing carries a plurality of electrical terminal pins, which have their one end projecting externally from the rear end of the housing and which have their other end projecting through the bottom of the housing. The stylus assembly includes a knob member which supports a stylus subassembly having an armature which carries a pair of coils, and which also supports a plurality of electrical connectors which are adapted to be detachably coupled with the terminal pins. The ends of the coils are electrically connected with the connectors.

Abstract: A PCM recording system uses vertical and horizontal synchronizing signals like those of a television video signal, and records PCM sound signal data taking the form of PCM signals converted from a sound signal during specific ones of plural horizontal scanning periods disposed between the vertical synchronizing signals. At least one control signal such as an absolute address signal representing a tape position, an operation indicating signal for indicating the operations such as a tape running stop and a tape rewind and an adjusting signal for adjusting a reproducing system is recorded during the horizontal scanning period with no recording of the PCM sound signal data. At the time of signal reproducing, the control signal is extracted to perform a given display or a given control.

Abstract: Disclosed is a method and apparatus for recording information on a disc-shaped record carrier body with a single beam of radiation. The record carrier body is provided with a servo track which preferably exhibits a phase structure and which contains a multitude of sector addresses each associated with a portion provided with a radiation sensitive layer. Before the information is recorded, the beam is switched to a low, read level and the desired address is located. Simultaneously, the radial position and tangential speed of the radiation spot and the focusing of the radiation beam are checked. Once the desired address is located, the beam is switched to a higher, write intensity and the information is recorded on the radiation sensitive layer of the portion associated with that address. During recording, the radiation returning from the record carrier can be used to check whether the information is recorded correctly.

Abstract: A pickup arm is equipped with a photo sensor assembly for detecting non-recorded portions on a disk. The sensor is located in such a position that horizontal distance between the stylus tip and the detecting point of the sensor measured in the direction of the radius of the turntable is substantially constant throughout the possible rotational angle of the arm. The rotational angle of the arm is measured and is modified by a given angle corresponding to the above mentioned distance. When this distance deviates from a standard value on replacement of the same with another, the variation may be readily corrected by manipulating a potentiometer. Prior to performing an automatic playback, the disk is scanned by the sensor and signals indicative of the arm angles corresponding to the non-recorded portions are stored.

Abstract: A tracking control apparatus is employed in apparatus for reproducing video signals from a rotary recording medium. A reproducing transducer is used for reproducing recorded signals in which a main information signal has been recorded in a plurality of adjacent tracks and at least one reference signal has been recorded at an intermediate position between the longitudinal center lines of the adjacent tracks. The tracking control apparatus positions the reproducing transducer to follow a correct tracking along the main information signal track. The reference signal is separated from the signal reproduced by the reproducing transducer. A control signal is produced in response to the separated reference signal for application to the tracking control means. An automatic gain control operation fixes the level of the separated reference signal at a stage prior to the stage where the control signal is produced.

Abstract: In a video disc player, a carriage is subject to translatory motion in correlation with radial motion of a playback stylus relative to a disc record disposed on a rotatable turntable. A stylus arm carrying the stylus at one end thereof has the other end secured to the carriage by means of a compliant rubber coupler. A magnetic element is disposed on the stylus arm near its free end. An electromagnet is fixedly mounted in the carriage adjacent to the stylus arm-mounted, magnetic element. The electromagnet is selectively actuated to cause a change in the radial location of the stylus.