Abstract: A note ROM is addressed in response to a note code signal generated from a note code generator, and basic data is read out from the note ROM. The basic data is shifted by one higher bit and is thus doubled, and the shifted data is supplied to the A terminals of a full-adder. The basic data read out from the note ROM is supplied to the B terminals of the full-adder. The full-adder generates integer multiple data which has a value three times that of the basic data. This integer multiple data is decremented by one every time a clock is generated. When the integer multiple data becomes zero, a one-shot waveform data read clock signal is generated through an inverter.

Abstract: A dynamically illuminated guitar (10) for producing visual and sequential lighting effects on the guitar body (20) caused by spontaneous or deliberate hand and body movements of the guitarist and by external light sources. A plurality of light-emitting diodes (30) through (93) embedded into the guitar face and arranged in aesthetically pleasing designs serve as the display medium. A variety of different light display modes is selected by changing the orientation of the guitar (20) to cause a group of mercury tilt switches (120), (130), (140) to control the digital pulse format of an electronic pulse-forming circuit. Light-dependent resistors (160), (170) embedded on the guitar face further cause the guitar visual lighting display to be controlled by external variable lighting.

Abstract: A waveform step counter receives an output clock from a tone clock generator and an envelope status signal from an envelope counter. The waveform step counter generates an address signal for performing predetermined address skip, and a waveform memory is accessed in accordance with this address signal. Since the address signal performs the predetermined address skip, waveform information read out from the waveform memory indicates a timbre different from the original information stored in the memory.

Abstract: A digital filter imparting a desired tone color to the tone signal is realized by the combination of a digital pole filter and a digital zero filter capable of controlling a pole and a zero in an amplitude-frequency characteristic respectively. The amplitude-frequency characteristic of the digital filter is a composite of the respective characteristics of the pole filter and the zero filter. A "peak" portion and a "valley" portion in this composite characteristic can be set independently by the pole control of the pole filter and the zero control of the zero filter, whereby the desired tone color characteristic can be readily realized. Further, the digital filter may comprise a plurality of digital filters having respective different constructions and a connection switching circuit capable of setting arbitrarily connection between these filters. The filter characteristic as a whole can be diversely altered by changing the connection, whereby diverse tone color characteristics can be realized with ease.

Abstract: An automatic rhythm performing apparatus capable of producing a rhythmic tone of a plural-tone-source rhythmic musical instrument such as a snare drum comprises a plurality of signal producing devices which produce a plurality of rhythmic tone signals corresponding to the respective tone sources of the single instrument. A control device controls respective signal levels of the rhythmic tone signals and a combining device combined the rhythmic tone signals at signal levels controlled by the control device to provide a combined signal corresponding to the rhythmic tone of the instrument, thereby providing a desired volume relationship of the respective component tones constituting the whole rhythmic tone of the instrument.

Abstract: This electronic musical instrument has plural operation units respectively performing a predetermined basic waveform generation operation (e.g., frequency modulation operation) using a phase signal representing a pitch of a tone to be produced or a waveform signal generated by the operation unit. There is further provided a setting section for variably setting a combination of input and output connections between the respective operation units as freely as the performer desires. The input and output connections between the operation units are switched according to the set combination. An operation algorithm for tone synthesis is determined according to the combination of connections between the operation units set in this manner whereby a free tone synthesis as desired by the performer is realized. A display is provided for visually indicating the set combination of connections and a state of connection between the respective operation units is indicated as a graphic pattern on this display.

Abstract: An electronic musical instrument is of a type in which tones are produced by a limited number of tone production channels which are efficiently used for a larger number of tones utilizing channel assignment technology. Normally, three of the channels are exclusively occupied for production of three tones to constitute a triad chord. But at time a bass tone is to be produced, the specific one of the three channels is compulsively used for production of the bass tone, giving up exclusivity for production of the chord tone. This eliminates the need of providing an additional channel for the bass tone production.

Abstract: A musical performance or accompaniment unit which is so arranged that, with employment of a so-called sound multiplex system recording medium in which a vocal signal of a singer or the like is recorded on its first track and a musical signal of a musical instrument for accompaniment is recorded on its second track, when a user sings, with the recording medium being subjected to reproduction, singing abilities of the user such as rhythmical feelings, degrees of bass or soprano, etc. are automatically marked for display through comparison and calculation of the above reproduced vocal signal and signal of the song sung by the user.

Abstract: This electronic musical instrument comprises digital tone generation circuits having a plurality of tone generation channels each being capable of selecting a tone color independently from other channels. In each of the tone generation circuits, digital tone signals having the selected tone colors are produced in response to operation of a key or a switch. A specific number of analog channels are provided for processing analog tone signals channel by channel and a channel divider is also provided for distributing the digital tone signals generated by the digital tone generation circuits to these analog channels in specific combinations according to the selected tone colors. This channel divider further mixes the distributed digital tone signals together for each of the analog channels for time-division-multiplexing the mixed digital tone signals for each of the analog channels. The multiplexed digital tone signals are converted to analog signals by means of a single digital-to-analog converter.

Abstract: Musical tone color setting apparatus is arranged so that when a program/preset switch, a feet switch envelope switch and modulation switch are actuated together with a selected key of a ten-key input unit, program tone color data obtained by combining data selected from three groups of tone color data is stored in a tone color data memory. A tone color data corresponding to the program tone color data stored in the memory is later read out from a ROM, and a music sound having a tone color corresponding to the tone color data is generated from a loudspeaker in response to operation of a keyboard.

Abstract: The differentiation data of a basic waveform is read out from a differentiated value waveform memory at a clock timing corresponding to a musical scale of an operated play key, and it is multiplied by an envelope value of a musical sound waveform to form a musical sound waveform differentiation value. In parallel therewith, the differentiation data is accumulated at the clock timing to form a compensative value. The compensative value is added with the musical sound waveform differentiation value at the point of time at which the envelope value is changed to cancel a DC component which would otherwise develop in a produced musical sound waveform. The musical sound waveform differentiation values thus compensated are accumulated, and are subjected to digital-to-analog conversion, so that the musical sound waveform free from the DC component is produced.

Abstract: A touch response apparatus for an electronic musical instrument wherein a nonlinear analog-to-digital conversion is effected using a single A/D converter in correspondence with a plurality of keys, and wherein touch data are proportional to the period of time and amplitude value of an envelope waveform.

Abstract: A plurality of channels for generating musical tones are provided in LSI chips. A CPU allots a performance mode selected by select switches to the channel or channels. The melody sounds or accompaniment allotted to the channels are generated by a time divisional processing under control of the CPU. The generated sounds are sounded through a loudspeaker, after being subjected to processing by a mixing circuit.

Abstract: An automatic rhythm performing apparatus capable of simultaneously producing a plurality of rhythmic tones having the optimum volume relationship irrespective of the total volume of the rhythmic tones. A plurality of rhythmic tone signal generating devices generate a plurality of rhythmic tone signals corresponding respectively to a plurality of rhythmic musical instruments. A combining device combines the rhythmic tone signals to provide a combined output signal as an output of this apparatus, the level of which can be varied by a signal level varying device. There are provided a detecting device for detecting the level of the combined output signal and a controlling device for separately controlling respective signal levels of the rhythmic tone signals in accordance with the detected level of the combined output signal, thereby making the volume relationship of the plurality of the rhythmic tones optimum.

Abstract: An indirect speed sensor for an electric motor, such as an electric motor of the universal type, provides for a resistive element in series with the motor windings so that current pertubations that occur as a consequence of armature rotation are manifested as speed-dependent voltage signals across the resistive element. The voltage signals are amplified and filtered to remove frequency components above and below the expected signal spectrum and then provided to an analog-to-digital converter that converts the filtered analog signal to digital values that are stored in a memory. A stored-program controlled microprocessor analyzes the stored digital information by performing a fast Fourier transform to provide an equivalent amplitude spectrum. The maximum amplitude spectral component is then identified to determine the speed of the motor.

Abstract: A reduction gear type D.C. starter motor for an internal combustion engine including a planetary type reduction gear system mounted in a front bracket at a faucet joint portion between it and a rear bracket, the rear bracket and the yoke being integrally formed.

Abstract: An electronic musical instrument comprises means for detecting depressed-keys on a keyboard to generate key informations corresponding to said depressed keys, and means for generating a musical tone signal which varies pitch from the pitch of a musical tone generated by a firstly-depressed key to the pitch of a musical tone generated by a secondly-depressed key, in accordance with a key information of said firstly-depressed key and a key information of said secondly-depressed key. In the instrument, means is provided for generating an amplitude coefficient which sequentialy varies from an amplitude of the musical tone generated by the firstly-depressed key to an amplitude of the musical tone generated by the secondly-depressed key whereby the amplitude of said musical tone signal is controlled according to said amplitude coefficient.

Abstract: A musical tone forming system includes a waveform storage device for storing data representative of an attack portion of a musical tone waveform and data representative of part of the other portion of the musical tone waveform following the attack portion. An address device addresses the waveform storage device to first read the data representative of the attack portion and to then repeatedly read the part of the waveform from the waveform storage device to thereby form a musical tone signal. There is provided a device for generating data varying with time. The address device feeds an address data to the waveform storage device in accordance with the time-varying data to randomly designate as a starting address one of those addresses of the waveform storage device storing the data of the part of the waveform, thereby realizing a noisy nature characteristic of a percussion instrument.

Abstract: Herein disclosed is a drive system for a servomotor for use with the carriage of a serial printer, comprising a source of a variable command signal representative of the speed at which the servomotor is to operate, detecting means for detecting the output speed of the servomotor and producing a signal representative of the detected servomotor output speed, and first and second voltage sources respectively operative to supply predetermined voltages, the voltage from the first voltage source being higher than the voltage from the second voltage source.

Abstract: An automatic guidance device for a self-powered cargo-moving vehicle operated by a vehicle-borne sensor which follows a buried, energized wire path and which includes sensor means mounted either between the fixed and steerable axles or in the front of the fixed axle of the vehicle for guiding the vehicle when it travels in a direction such that the fixed axle precedes the sensor by effectively generating a position error signal relative to the direction of travel, the position error signal provided by a pair of sensing coils whose outputs are combined to generate an error signal V=K(R-F)+F where R and F are the differences of the output of a pair of rear sensor, and a pair of forward sensors, respectively, and K is equal to the ratio of the distance between the forward pair of coils and the virtual sense point to the distance of the rear and forward pairs of coils.