Matsushita Electric Industrial Co., Ltd.

Takeji Kimura

Michihiro Inoue

Masaharu Sato

Masahiko Tsunoo

Eiichi Tsuboka

Hirokazu Yoshino

Tomio Oyama

Haruyasu Yamada

Toyoki Takemoto

Ryoichi Wada

Namio Hirose

Shuzi Harada

Masaya Nakajima

Masao Nakazawa

Tatuo Fujita

Hideo Hozumi

Shiro Horiuchi

Iwajiro Sembokuya

Katsumi Fujisaki

A television receiver is disclosed, which receives two television signals and compresses a time axis of one of the television signals and inserts the compressed signal to a portion of the other television signal to display both signals on the same screen. A signal indicating a boundary of the two images is produced from a synchronizing signal derived from one of the two received television signals and the boundary indicating signal is superimposed on one or both of a brightness signal and a chrominance signal to display the boundary.

Television receiver for display of plural video images including a

An electronic musical instrument of a type in which information of actuation of keys is detected by scanning the keys of keyboard. The electronic musical instrument includes the keys selectively actuable for producing sounds which correspond to respective musical scale notes, circuitry for sequentially scanning said keys for detection of the information of the actuation of said keys, and memorizing circuitry which corresponds to each of the keys so that the information of the actuation of the keys is memorized. Each memorizing circuitry is composed of a pair of capacitors, one of which is a small capacitor for 'dynamic' holding, and the other of which is a capacitor for determination of decay envelope, with the latter being sequentially connected electrically to the former.

Electronic musical instrument

The present invention is an electronic musical instrument the type in which information of the actuation of keys is detected by scanning the keys of a keyboard. The electronic musical instrument includes keys selectively actuable for producing sounds which correspond to respective musical scale notes, circuitry for sequentially scanning these keys for detection of the information of the actuation of these keys, and a memory circuit corresponding to each of the keys so that the information of the actuation of the keys is stored in the memory circuits.

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 a potential distribution in a source region, and an impedance converter 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.

Tone generator system for an electronic organ

An electronic musical instrument has a plurality of tone selectors which select musical tones; a waveshape calculator which calculates a waveshape represented by amplitudes at two or more than two sampled points of one period of the selected tone and which is operative whenever the tone selectors are actuated; a plurality of waveshape memories which temporarily memorize the calculated waveshapes; clock signal generator which generates clock signals with high frequencies corresponding to pitches of depressed keyswitches of the musical instrument and which is operative whenever the keyswitches are depressed; a reading circuit which repetitively and successively reads out the memorized waveshape amplitudes by the clock signal generated by the clock signal generator; and a converter which converts the waveshape amplitudes read out by the reading circuit to a musical tone, wherein a musical tone is generated by repetitively reading out the temporarily memorized musical waveshape.

Electronic music instrument

The present invention is an integrated circuit for an electronic musical instrument comprising: a plurality of frequency divider chains receiving a plurality of input signals for dividing the frequencies of the input signals one after another and corresponding to a plurality of series of adjacent notes which are chromatically arranged in turn in a twelve-tone of a musical scale, respectively; keyer-gates for switching on and off the input signals and output signals of the frequency dividers of the frequency divider chains respectively; and adding means for adding at least two output signals of the keyer-gates which correspond to the adjacent notes chromatically arranged to each other, so as to produce output tone signals therefrom, respectively.

Integrated circuit for an electronic musical instrument

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.

The channel current of an MOS transistor is controlled by varying the potential distribution in the source area. The source area is formed of a resistive material and provided with at least two electrodes on at least one of which a controlling voltage is applied. The current between the source and the drain terminals increases more rapidly than the linear change with respect to the increase in the voltage between the terminals, i.e. current-voltage characteristics are convex toward the lower direction. This device has excellent characteristics for use as a discharge impedance element in a sustain function circuit of an indirect keying or other circuit of an electronic musical instrument.

MOS type semiconductor device

In a television receiver, a video signal for a single frame at any moment is stored in a storage tube. The stored video signal is displayed, if necessary, as a still picture on a part of the picture tube screen together with the ordinary broadcasted television picture in motion.

Television receiver with zoom storage tube frame grabber with electronic

An electronic organ comprises memory means for memorizing in an analog manner the synthesizing ratio of repetitively occuring waves such as square waves for synthesizing qualities of sound in response to the signals from means for selecting qualities of sound (to be referred to as tablets hereinafter); a mixing circuit for adding the synthesizing ratio for each repetitively occuring wave when the means for selecting qualities of sound are selected; frequency dividers for dividing the oscillation frequencies of top octave generators, an indirect keying circuit for interrupting the current corresponding to the ratio of repetitively occuring waves in response to the repetitively occuring signal waveforms from the frequency dividers and intermittingly interrupting said current in response to on-off signals from a keyboard; a synthesizing circuit for combining the outputs from the indirect keying circuit into a group for each octave; a variable filter for changing the frequency characteristics electronically in response to the outputs from said tablets; and detectors of key number and tablet number for detecting the number of keys pressed and the number of tablets selected, respectively, for effecting the additive control of the amplitudes of the output tone signals.

Electronic organ

A ghost signal cancellation system for cancelling ghost signals caused, for example, by reflection in a transmission line of television signals transmitted from a television transmitting station. This system is particularly suited for incorporation in a television receiver to improve the picture quality of a reproduced picture.

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Hirakata, Japan

Takeji Kimura