Abstract: Chroma-signal processing system is disclosed wherein a color television signal is sampled at a frequency equal to a sub-carrier frequency multiplied by an integer, and chroma-components of the sampled signals are sequentially stored in a plurality of storage means for each of the sample points, and the chroma-signals are retrieved from the storage means while omitting portions of the chroma signals whereby accomplishing the chroma-signal processing with a fewer number of storage means. The system can be used to reduce the size of a displayed color image without introducing phase discontinuities into the chrominance subcarrier. The reduced image may then be inset into another color image displayed on a CRT. The system may also be used to reduce the subcarrier frequency of a chrominance signal.

Abstract: Piezoelectric ceramic compositions having very high mechanical quality factors, high electromechanical coupling coefficients and high durabilities of the piezoelectric constants with cycling of mechanical impact, and comprising the quaternary system Pb(Zn.sub.1/3 Nb.sub.2/3)O.sub.3 -Pb(Mn.sub.1/3 Nb.sub.2/3)O.sub.3 -PbTiO.sub.3 -PbZrO.sub.3.

Abstract: Two yokes of magnetic material are fixedly attached to opposite axial ends of a magnet which is revolvable about its axis with a revolving shaft, an alternating magnetic field generator is positioned in the magnetic field between the two yokes to generate alternating magnetic field with revolution of the shaft, and a magnetoelectric transducer is provided in the alternating field in order to generate a pulsating electrical signal indicative of the number of the shaft revolutions.

Abstract: A channel selection apparatus having a tuner including a voltage-dependent reactance element such as a varactor diode, to which one of a plurality of channel selection voltages having different magnitudes for each of the channels is applied to select a desired channel. A plurality of channel selection voltages for selecting a plurality of channels are digitalized and previously stored in a memory block at addresses corresponding to the channels. During the channel selection operation, the digital voltage signal for the channel desired to be selected is read out of the memory block and D-A converted to produce an analog channel selection voltage, which is then applied to the tuner to select the desired channel. The memory block further stores bits to indicate whether the channels are to be selected or not to be selected but skipped to select the next channel, at each of the addresses corresponding to the channels. Thus, only the required channels can be sequentially selected.

Abstract: A frequency combining circuit in the form of a planar transmission circuit has a four-port directional coupler, two transmission lines respectively coupled to the forward and backward coupling ports of the directional coupler, and two filters respectively coupled to the two transmission lines, one of the two filters being further coupled to a load. By applying a first frequency signal to the coupler input port and applying a second frequency signal to the other one of the filters, the first and second frequency signals are combined in an excellent manner at the coupler output port of the coupler due to the provision of the two filters both of which reject the first frequency signal and pass therethrough the second frequency signal.

Abstract: There is provided a voltage-dependent resistor comprising a bulk consisting essentially of zinc oxide as the major part and as additives 0.01 to 10 mol % of Bi.sub.2 O.sub.3, CoO, MnO, TiO and NiO and electrodes on the bulk, said electrodes having been formed by baking a silver paste comprising silver powder and a glass frit on the bulk, said glass frit containing as its principal content 80 to 95% by weight of Bi.sub.2 O.sub.3 and correspondingly 20 to 5% by weight of SiO.sub.2, said glass frit also containing 1 to 5 parts by weight of B.sub.2 O.sub.3 for 100 parts of said principal content. The electrodes can also contain minor amounts of CoO, Sb.sub.2 O.sub.3, a mixture of Sb.sub.2 O.sub.3 with Ag.sub.2 O or MgO, or a mixture of CoO with MgO or Ag.sub.2 O.

Abstract: This invention concerns a signal attenuator which can be used between an antenna and a television receiver or VHF/UHF radio, so as to appropriately attenuate VHF or UHF signals applied thereto. The signal attenuator comprises, in a shielding metal enclosure, an insulator substrate having an input electrode, an output electrode and a pair of ground electrodes, the electrodes being arranged symmetrical to each other with respect to a point on the substrate. The electrodes are arranged to define narrow gaps between the ground electrodes and the input and output electrodes. A set of flat shaped resistors is directly connected between the electrodes in symmetrical relationship with respect to the point on the substrate.

Abstract: The invention discloses a magnetic recording-reproducing device wherein a reversible motor is drivingly coupled to two one-way rotary clutches one of which is engaged when rotated in one direction and the other of which is engaged when rotated in the other direction and to a capstan shaft for transporting a tape at a constant speed, and the one-way rotary clutches are drivingly coupled to two reel shafts, respectively, whereby depending upon the direction of rotation of the reversible motor, either of the reel shafts is selectively driven together with the capstan shaft.

Abstract: An electroless copper plating solution comprising a copper salt, complexing agent, reducing agent, alkali hydroxide and aliphatic perfluorocarbon-containing non-ionic surface active agent is suitable for producing copper deposition having high ductility and good appearance, and further such a solution is very stable even at a high temperature.

Abstract: In a voltage supply circuit for voltage-dependent capacitor diode tuning, a d.c. voltage is produced by a.c.-d.c. conversion of an a.c. voltage which is obtained by amplifying an a.c. signal from an oscillator with the aid of a transistor amplifier of the series-feedback type having an amplifying transistor having an amplification factor depending on a variable reactance coupled to an emitter of the amplifying transistor. The variable reactance controls the amount of negative feedback to obtain the corresponding gain of the amplifier. The degree of amplification decreases as the amount of the negative feedback increases, so that the output d.c. voltage will be stable especially in a low voltage region.

Abstract: A headphone capable of attaining binaural hearing giving substantially the same sound quality as one would expect from ordinary loudspeakers, said headphone having such sound pressure versus frequency characteristics that there are two peaks between 1.5 and 5 KHz and the level differences between the low level area and the peaks are limited within the range of 6 to 17 dB. The headphone leads the sound from a transducer through the outside as well as inside of the headphone to the ears.

Abstract: Electric blower assembly wherein air expelled by centrifugal force from impellers passes through volute chambers disposed peripherally with respect to said impellers and each defining a space which is increasingly larger as the distance from the impellers increases, whereby smooth air flow is produced in the volute chambers since the speed of air flow therethrough is lessened and pressure therein becomes static pressure. From the volute chambers air passes along inclined channels and then around a drive motor, whereby the drive motor is cooled. In entering at least part of each volute chamber air from the impellers comes into contact with a volute chamber wall extension which becomes gradually lower in a direction opposing that of impeller rotation whereby noise due to contact of a volute chamber wall by all portions of the air from the impeller does not occur simultaneously and a quieter blower assembly is provided.

Abstract: A method of making an electrooptical system including a transparent ferroelectric ceramic element which possesses memory in that a birefringence corresponding to an applied electric field remains after the field is removed. The electrooptical element is hot-pressed from a family of materials which comprises solid solution of the ternary system, lead magnesium niobate-lead titanate-lead zirconate, and the hot-pressed material may additionally contain a small amount of lanthanum oxide (La.sub.2 O.sub.3).

Abstract: A channel selection mechanism for an electronic tuner of a television receiver comprises a motor-driven shaft, a voltage selection rotary switch with the contact arm mounted on the shaft, a channel number indicating drum mounted on the shaft for rotation with the rotary switch, a cam wheel having notches on the periphery thereof and mounted on the shaft for rotation with the rotary switch and the drum, and a cam follower pivoted at one end to engage the working surface of the cam wheel to provide swivel movements. The motor is energized by a motor start switch which is operated until a desired channel is reached. A motor stop switch is provided to operate in response to the swivel movements of the cam follower to deenergize the motor to precisely align the channel indicating number to a window provided in the receiver housing.

Abstract: A tone generator system for an electronic organ which is capable of being fabricated into an LSI structure and receives a saw-tooth wave or staircase wave as an input thereto comprises a frequency divider for the saw-tooth wave or staircase wave including a ladder resistor network and a complementary MOS FET devices, an analog switch having a wide dynamic range and a high linearity in input-output transfer characteristic constructed by MOS FET devices to serve as an indirect keying means, a sustain means including a novel structure of a variable impedance element which is constructed to control a channel current in a MOS FET device by varying the potential distribution in the source region, and an impedance coverter constructed by complementary MOS FET devices and free from a D.C. level shift. With the above arrangement a tone generator system of high quality for an electronic organ is provided.

Abstract: In a cassette casing having a supply reel, a take-up reel and a hollow cylindrical member, a magnetic tape is fed from the supply reel and, after having been spirally wound around the intermediate hollow cylindrical member, is wound on the take-up reel. To this end, the hollow cylindrical member is formed with a spiral guide rib with a pitch substantially equal to the width of the magnetic tape and threadedly or screwwisely received in an opening formed in the bottom plate of the cassette casing. When the cassette casing is placed in the position in which it is ready for operation within a video recording and reproducing apparatus, a rotatable magnetic head drum having a magnetic head is inserted into the cylindrical member. Thereafter, the cylindrical member is moved outwardly from the cassette casing by rotating it through a driving apparatus, whereby the magnetic tape wound around the cylindrical member is progressively transferred onto the head drum to the position for recording or reproducing.

Abstract: A vibration detecting device adapted to be mounted on a musical instrument, such as a guitar or a violin, or a mechanical conversion apparatus for detecting sound generated by the guitar or the like or other vibration is provided, which is of simple structure having a piezoelectric ceramic plate housed in a case, and has a high sensitivity and an excellent frequency characteristic. A method for adapting the vibration detecting device is also provided.

Abstract: There is provided an image reproduction system whereby a moving picture and a still picture can be selectively reproduced from a tape-shaped recording medium having images recorded thereon in sequential frames and which also enables simple and automatic frame aligning.

Abstract: A cassette-type magnetic tape player has a take-up reel mount operatively coupled to a motor. The take-up reel mount is provided with an end-of-play detecting mechanism for substantially ejecting a tape container, such as cassette or cartridge, out of the player when a full length of magnetic tape has been wound around a take-up reel within the tape container. A rapid advance mechanism for transferring the magnetic tape onto the take-up reel at a speed higher than that required during normal recording or playback and a guide mechanism for guiding a movable chassis for movement in relation to a stationary chassis are also provided.