A method and apparatus for phase modulating a carrier signal to convey an information signal (12) such that the carrier signal has a constant amplitude envelope. A Hilbert transform signal (14) of the information signal (12) is produced. The signals (12, 14) are sampled to produce signals (16, 18), which represent cartesian coordinate values. The cartesian coordinate values are then converted into equivalent polar vectors (20-36) which have both an amplitude (R) and an angle (θ). The polar vector quantity (R,θ) is converted into two unity amplitude vectors (A, B). The unity amplitude vectors (A, B) are offset from the polar vector quantity by an angle the cosine of which is proportional to the amplitude of the polar vector (R). The carrier signal is sequentially phase modulated by each of the angles of the unity amplitude vectors (A, B) for each sample period of the information signal. This modulation procedure maintains a constant amplitude envelope for the carrier signal and makes possible simultaneous demodulation of a plurality of carrier signals in a single demodulation channel.

Method and apparatus for pulse angle modulation

An MOS integrated circuit has an array of terminal means connectable to an output buffer or the like arranged around an array of MOS circuit components such as shift registers or the like and has a novel metal programmable matrix arranged for compactly and economically accommodating any selected interconnection of the shift registers and terminal pins at the metal conductor level of the integrated circuit.

MOS integrated circuit having a metal programmable matrix

Dispositif (10) d'enregistrement longitudinal permettant de produire le ralenti d'un affichage d'une information de scene ayant ete enregistree sur un support (16) d'enregistrement magnetique. (10) longitudinal recording to produce idling of a display scene information having been registered on a support (16) of magnetic recording. Conformement au mode de realisation prefere, le support d'enregistrement (16) est transporte periodiquement suivant des cycles de transport vers l'avant ou vers l'arriere (Fig. 2 ou 3) pendant lesquels une image d'une information de scene est reproduite a partir du support d'enregistrement (16) et stockee dans un dispositif de stockage d'image (38) pour l'affichage repete sur un moniteur video (46). Accordance with PREFERRED EMBODIMENT, the recording medium (16) is periodically transports next transport cycle forward or backward (Fig. 2 or 3) during which an image of scene information is reproduced from the recording medium (16) and stored in an image storage device (38) for repeat display on a video monitor (46). Le transport du support d'enregistrement (16) conformement a des cycles de transport successifs vers l'avant produit un affichage au ralenti vers l'avant de l'information de scene, tandis que des cycles successifs de transport en arriere produisent un affichage au ralenti en arriere de l'information de scene. Transporting the recording medium (16) in accordance with successive transport cycles forward produces a display in slow motion forward scene information, while successive rounds of transportation back to produce a display slow backward the scene information.

Slow motion effect using longitudinal recording and forward/reverse tape transportation.

An active balun device is provided. The active balun device includes: a differential input portion for receiving an external single input signal to output two complementary differential signals; and a differential amplifier connected to the differential input portion in cascade to amplify the two differential signals received from the differential input portion. Thus, the active balun device has a sufficient gain and a desired bandwidth in a semiconductor circuit.

Active balun device

Disclosed is a mixer circuit which employs four FET's in a manner so that a source electrode of a first FET and a source electrode of a second FET are connected to a first terminal, a source electrode of a third FET and a source electrode of a fourth FET are connected to a second terminal, a first impedance circuit is connected between the first terminal and the earth, a second impedance circuit is connected between the second terminal and the earth, a first high frequency input terminal is connected through a first switching circuit to a junction between the first impedance circuit and the first terminal, a second high frequency input terminal is connected through a second switching circuit to a junction between the second impedance circuit and the second terminal, a gate electrode of the first FET and a gate electrode of the fourth FET are connected to a third terminal, a gate electrode of the second FET and a gate electrode of the third FET are connected to a fourth terminal, a drain electrode of the first FET and a drain electrode of the third FET are connected to a fifth terminal, a drain electrode of the second FET and a drain electrode of the fourth FET are connected to a sixth terminal, and an electric source supply circuit is connected to the fifth and sixth terminals. Phase-reversed local oscillation signals are fed to the third and fourth terminals.

Mixer circuit for use in a tuner of a television set or the like

A frequency mixer or converter which is applicable for use in superheterodyne radio frequency signal receivers and has good linearity characteristics as well as a low noise characteristic. The mixer utilizes a balanced transistor pair arrangement with an RC highpass filter but does not use a differential amplifier for amplifying the radio frequency signals. This results in a mixer having good low noise characteristics and good linearity as well as high attenuation of spurious intermediate frequency signals. In addition, the design is amenable to fabrication by integrated circuit technology.

Transistor balanced mixer

An arrangement for minimizing the picture quality reducing fluctuations in television signals reproduced from a video tape recorder and supplied to a television receiver Television signals reproduced from the video tape recorder are applied to signal switching means and signal separator means, respectively The signal switching means remove only horizontal synchronizing pulses from the reproduced television signals and result in modified picture signals The signal separator means take out horizontal synchronizing pulses selectively, which are applied to a time base processor means in which the timing of the horizontal synchronizing pulses is modulated so as to compensate for the phase shift caused by the automatic frequency control circuit in a monitor television receiver The modified picture signals and processed horizontal synchronizing pulses are added together by mixer means, and then are supplied to a monitor television receiver As a result, the picture quality reducing fluctuations of the reproduced television signals are minimized

System for minimizing fluctuations of television signal

The mixer has a transistorised doubly-balanced modulator with a number of emitter-coupled transistor pairs. The quiescent current in the balanced modulator is made to increase as the input signal's amplitude increases. The signal being mixed with the input signal and applied to the balanced modulator is made to decrease as the input signal's amplitude increases so that the resulting distortion in the modulator is reduced over a broad range of input signal amplitudes. The mixer is for use in a receiver and its balanced modulator is connected to the antenna and to a local oscillator. The modulator is controlled by the output of an IF amplitude detector.

Balanced mixer for radio receiver - reduces distortion in modulator over wide range of signal amplitudes using emitter-coupled transistor pairs

An electronically controlled variable semiconductor resistor having a three layer construction of either an NPN-type or a PNP-type which is similar to that of a bipolar transistor and basically using the base region and collector region of the transistor as a variable resistor having its resistance value controlled by varying its emitter current. The conductivity of the base region adjoining the emitter region and that of the collector region opposite the emitter region across the base region are modulated largely by minority carriers injected into the base region from the emitter. The carrier density at each emitter, base or collector region is reasonably controlled so as to thereby make it possible to obtain a variable resistor whose resistance value changes about in an inverse proportion to the emitter current and the electrode of proper construction is designed to allow the control signal component for controlling the emitter current not to appear at both ends of the resistor electrode at the resistor.

Electronically controlled variable semiconductor resistor

A superheterodyne type multiplex signal receiver for multiplex signal transmission systems for receiving two independent signals transmitted by amplitude modulation and angle modulation of single carriers, and for detecting an intermediate frequency by an intermediate frequency detector when changing the local oscillating frequency by a dial operation to select the received signal. The receiver has a switching circuit so composed that it operates a demodulation circuit which demodulates, from the modulated carrier, the two independent signals, which are then transmitted to two independent audio amplifiers provided at a later stage of an intermediate frequency amplifier for driving two speakers for reception of the multiplex signal, when the intermediate frequency is extremely close to a normally determined frequency. The switching circuit also transmits to the two independent audio amplifiers the demodulated signals obtained from an envelope detection circuit when the intermediate frequency is remote from the normally determined frequency.

Multiplex signal receiver

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