Abstract: A channel selector characterized in that a plurality of receivers capable of simultaneously performing a receiving operation have a main part of a phase-locked loop frequency synthesizer connected in common thereto, the frequency synthesizer having a programmable frequency divider, a phase comparator, a reference oscillator and a reference frequency divider. The frequency synthesizer is controlled so that a local oscillation frequency corresponding to a determined frequency close to a broadcast signal of a desired receiving channel is synthesized, and one of a plurality of search tuning systems searches and tunes the broadcast signal from the local oscillation frequency.

Abstract: A channel selector for a radio frequency receiver system including a phase locked loop frequency synthesizer for synthesizing a local oscillator frequency corresponding to a closely determined frequency to a transmitted signal of a desired receiving channel, a closed loop search tuning system for varying the local oscillation frequency to provide an automatic frequency control operation of the channel selector, and a control system for enabling either the phase locked loop frequency synthesizer or the closed loop search tuning system to operate so as to control the local oscillation frequency in dependence upon the presence or absence of a received transmitted signal.

Abstract: A channel selection apparatus wherein digitized voltages corresponding to frequencies of respective channel or boundary frequencies each between respective adjacent channels are Hadamard transformed and stored, which are subsequently inverse-Hadamard transformed to reproduce the digitized voltages, which are then used for channel selection or channel indication.

Abstract: A channel selection apparatus of the scanning tuning type in which a tuning frequency is swept by a sweeping voltage to select a given tuning frequency. The sweep of the frequency is controlled for each channel by a control signal stored for each channel in the form of a number of pulses to attain exact instant tuning to a specified channel. An operating unit which compensates for temperature drift of the elements comprising the apparatus is provided to correctly compensate for temperature drift of these elements thereby attaining exact tuning.

Abstract: Anisotropic permanent magnets of Mn-Al-C polycrystalline alloy are produced by warm extrusion at a temperature of 530.degree. to 830.degree. C utilizing converging or tapered dies with lubricant interposed between the polycrystalline body and the converging die. With dies of rather small semiangles, alloys with improved magnetic properties with regard to (BH)max, and especially Br are obtained.

Abstract: This invention relates to a channel selector provided with a tuning circuit using variable capacitance elements as tuning elements, and has for its primary object the provision of such a channel selector in which bias voltages applied to the variable capacitance elements are preset so that one of these preset bias voltages may be selected by a binary memory circuit and a diode matrix circuit, the selection of the preset voltages disposed in a predetermined sequence may be effected in any desired direction, and one of the bias voltages corresponding to a desired channel may be automatically selected.

Abstract: Magnetic alloys consisting of 68.0.about.73.0 weight % manganese, (1/10 Mn - 6.6).about.(1/3 Mn - 22.2) weight % carbon, the balance aluminum, which show wasp-waisted magnetic hysteresis loops with the ratio of the residual magnetization 4.pi.I.sub.r to the intensity of magnetization 4.pi.I.sub.10000 in a magnetic field of 10000 Oe, I.sub.r /I.sub.10000, falling 0.0.about.0.2.

Abstract: A tuning apparatus using a voltage-dependent reactance element comprising a tuning circuit including a voltage-dependent reactance element as a tuning element, a voltage sweep circuit for generating a sweep tuning voltage to be applied to the voltage-dependent reactance element, an operational circuit for converting the tuning voltage to a reference voltage which linearly varies in proportion with a tuning frequency and a voltage comparator circuit for comparing an output of the operational circuit with a predetermined standard voltage, an output of the voltage comparator circuit being used to control the sweep of the voltage sweep circuit to produce a predetermined tuning frequency.

Abstract: An anisotropic permanent magnet of an Mn-Al-C alloy containing 68.0% to 73.0% by weight of manganese, (1/10Mn-6.6)% to (1/3Mn-22.2)% by weight of carbon, and the remainder aluminum, which alloy is rendered anisotropic by deforming it plastically at a temperature of 530.degree. to 830.degree. C.The permanent magnet has excellent mechanical characteristics and magnetic properties such that the (BH) max is above 4.8 .times. 10.sup.6 G.Oe up to about 9.2 .times. 10.sup.6 G.Oe in its bulk state.

Abstract: A search type tuning device wherein the output signal representing the difference frequency between the output frequency from a voltage-controlled frequency sweep oscillator and a reference frequency is filtered by a low-pass filter; the difference between the output voltage from the low-pass filter and a predetermined driving voltage for sweeping the oscillation frequency of the oscillator is derived from an adder; the output from the adder is integrated by an integrator; and the output voltage from the integrator is applied as a sweep voltage to the oscillator, thereby automatically maintaining the oscillation frequency thereof at a predetermined value. The analysis of the operation of the oscillator may be much facilitated, and when used as an automatic channel selector for a television receiver, a high speed automatic channel selection may be ensured.

Abstract: A channel selector comprising a tuning circuit including a variable reactance element as a tuning element and a non-volatile memory for permanently memorizing coded signals of channel selecting voltages to be applied to said variable reactance element, and being arranged in such a manner that the channel identification numbers and the coded signals for selecting these channels can be correspondingly memorized preliminarily in said non-volatile memory, and in channel selection the coded signal of the channel selecting voltage corresponding to a desired channel can be read out from said non-volatile memory, converted into a voltage and applied to said variable reactance element to achieve channel selection. A selected channel does not change by the cutting of the power source and the device is purely electronic. The device is especially effective for use in a television receiver.

Abstract: A sweep output generator in which an a-c voltage of small amplitude is superimposed upon a sweep voltage applied to a variable reactance element of a local sweep voltage controlled oscillator for sweeping the local oscillator frequency and also for frequency modulation. The frequency modulated local sweep oscillator output and the output of a second voltage controlled oscillator are coupled to a mixer to obtain an intermediate frequency signal. The intermediate frequency signal is frequency demodulated through a frequency discriminator, whose output is in turn integrated to obtain a sweep output voltage of a characteristic similar to the normalized oscillation frequency versus impressed voltage characteristic of the local oscillator.

Abstract: An anisotropic permanent magnet of an Mn-Al-C alloy containing 68.0% to 73.0% by weight of manganese, (1/10 Mn-6.6)% to (1/3 Mn-22.2)% by weight of carbon, and the remainder aluminum, which alloy is rendered anisotropic by deforming it plastically at a temperature of 530.degree.C to 830.degree.C.The permanent magnet has excellent mechanical characteristics and magnetic properties such that the (BH)max is above 4.8 .times. 10.sup.6 G.Oe up to about 9.2 .times. 10.sup.6 G.Oe in its bulk state.

Abstract: A method of making isotropic Mn-Al-C alloy magnets which comprises the step of subjecting an alloy comprising 71.0% to 73.0% by weight of manganese, (1/10 Mn -- 6.6)% to (1/3 Mn -- 22.2)% by weight of carbon and the remainder aluminum to plastic deformation at a temperature of 550.degree.C to 780.degree.C.By utilizing this method, it is possible to obtain isotropic Mn-Al-C alloy magnets having excellent magnetic characteristics, i.e. (BH)max = 2.0 .times. 10.sup.6 G. Oe or more.