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: At assembly of a woodwind such as a clarinet, an annular projection on a joint ring of the first joint abuts against the second ring key on the second joint which is thereupon pushed off the path of movement of the first ring key on the first joint, whereby crash of the ring keys is successfully obviated even at careless assembly.

Abstract: In construction of a keyboard device well suited for use on an electronic piano and a piano training device, a combination of a jack element corresponding to a jack on an actual action assembly, an abutment whose force acting on the jack element corresponds to the weight of an actual hammer, and a releaser corresponding to actual regulating button provides key touch very close to that obtained on an actual piano equipped with action assemblies.

Abstract: A gain-controlled amplifier amplifies with reduced distortion an input signal at a gain which varies exponentially in accordance with a control voltage, and has a wide dynamic range irrespectively of the value of the control voltage. The gain-controlled amplifier comprises first and second operational amplifiers, first and second transistor pairs, a bias current control circuit and a subtracting circuit. The first transistor pair comprises emitter-coupled first and second transistors of the same conduction type (PNP or NPN), and the second transistor pair comprises emitter-coupled third and fourth transistors of the same conduction type as the first and second transistors. The common emitters of the first and second transistor pairs are connected to output terminals of the first and second operational amplifiers, respectively. Non-inverting input terminals of the first and second operational amplifiers are grounded.

Abstract: A note clock generation circuit generates note clock pulses in correspondence to a note name of a tone to be generated. An octave rate data generation circuit generates rate data in correspondence to the octave range to which the tone to be generated belongs. By performing addition or subtraction of the rate data at the timing of generation of the note clock pulses, an address signal is generated. A tone generator generates a tone waveshape in the form of amplitude sampled values in response to an integer section of this address signal. An interpolation circuit performs interpolation between adjacent amplitude sampled values thus generated in response to a decimal section of the address signal. The rate of change of the decimal section of the address signal is changed in accordance with the tone range so that a finer interpolation is made as the tone range becomes lower. By this arrangement, decrease in an effective sampling frequency in the lower tone range can be prevented.

Abstract: In construction of a FRP sound bar preferably by lamination for percussive musical instruments, 30 to 80% by volume of reinforcing fibers are oriented in a resin matrix at least in the longitudinal direction of the sound bar and a plurality of longitudinal pores are almost uniformly distributed over the entire cross section of the sound bar, for easy and low cost production with ideal sound extension.

Abstract: In production of a permanent magnet by forming a roll of an elongated magnetic metal strap, a strap made from a spinodal decomposition type magnetic alloy is subjected, at least before formation into a roll, to age-hardening under concurrent magnetization in order to obtain a magnet having significant radial magnetic anisotropy well suited for use in sound systems such as loudspeakers.

Abstract: In production of a wood-type golf club head having a rigid shell, metal pieces are dispersed in the matrix of crude foamable synthetic resin filled in the interior of a crude rigid shell for long maintenance in position of the center of gravity of the product despite shocks at shooting balls.

Abstract: Tones of percussion instruments produce different timbres, i.e. different tone waveshapes, depending on the strength of percussion. An automatic rhythm apparatus includes a rhythm tone generating unit which stores the tone waveshape produced from a hard percussion and also that from a soft percussion performed on a same percussion instrument. A rhythm pattern is constructed by rhythmically aligned tone command signals, for various percussion instruments, designating timings and volumes of tones to be produced. At each tone production, these two kinds of waveshapes are read out by mixing them appropriately. That is, when a loud tone is to be reproduced, its waveshape is read out from the waveshape memory for loud tones, while a soft tone is read out likewise from the waveshape memory for soft tones, and a tone of an intermediate volume therebetween is reproduced by reading out the loud tone and the soft tone at a mixing ratio complying to the desired degree of volume.

Abstract: A musical tone generating apparatus of an adapter type to be connected to a host electronic keyboard musical instrument via an information cable for generating musical tone signals in accordance with key information supplied from the host musical instrument. The musical tone generating apparatus comprises switches for designating a fractional key range in the keyboard and generates a musical tone signal only when a key within the designated key range is depressed. A plurality of musical tone generating apparatuses of the same construction as the aforesaid musical tone generating apparatus can be connected in a cascade fashion to a single host electronic keyboard musical instrument.

Abstract: A complementary MOS type integrated circuit is produced by a method which comprises the steps of: disposing a first mask material layer on the surface of a semiconductor substrate, the first mask material layer having a first impurity introducing region corresponding to a desired well forming pattern; forming a well region by selectively doping an impurity into the surface of the substrate through the first impurity introducing region; forming a second mask material layer in such a manner as to cover both the first impurity introducing region and the first mask material layer; disposing first and second mask layers on the second mask material layer, the first and second mask layers respectively corresponding to a first active region pattern within the well region and a second active region pattern outside the well region, thereby defining a second impurity introducing region corresponding to a desired parasitic channel stopper pattern between the stack portion of the first and second mask material layers and

Abstract: In construction of a pad for a pad cup of a woodwind, the outermost skin bag is internally provided, at least in the region where the pad cup contacts an associated sound hole in the woodwind, with an air impervious layer such as a bladder sheet to ensure that the sound hole will be closed with a high degree of airtightness and which will ensure that the desired pad configuration is maintained over a long period of time.

Abstract: An electronic musical instrument comprises an accompaniment keyboard; a memory of a relatively small capacity storing a set of accompaniment data sequentially aligned and constituting accompaniment patterns; a read-out circuit to successively read out the accompaniment data from the memory at given clock pulse timings; a judging circuit to judge whether each accompaniment datum read out indicates a predetermined specific value; a random signal generator for generating, independently of the data-reading-out timings, random signals each differing in value with time; an accompaniment data determining circuit to determine the contents of each read-out accompaniment datum when the latter is judged to indicate the specific value in accordance with the signal randomly outputted just when a judgement is made; and a tone generation determining circuit to determine the generation of the accompaniment tone based on the key depression information coming from the accompaniment keyboard and also to function, when the read-

Abstract: Waveshapes of plural periods for plural channels having characteristics different from each other are stored in a waveshape memory and read out from it when a musical tone is to be produced. Read out waveshapes are respectively weighted by weighting data supplied from a weighting data generator and thereafter a desired tone waveshape is obtained by electrically or acoustically combining these weighted waveshape. As an example, the waveshapes are composed of plural attack waveshapes equal in number to channels and only one sustain waveshape. In this case, the attack portion of the musical tone is formed by the combined one of the attack waveshapes and the sustain portion is formed by the sustain waveshape. This enables the memory capacity of the waveshape memory to be reduced and facilitates the complex tone color control in the attack portion. In another case, each of the waveshapes is composed of an attack portion and a sustain portion, sustain waveshapes forming the sustain portions being matched in phase.

Abstract: An electronic musical instrument automatically plays a musical accompaniment utilizing a minimized number of tone signal generating channels. The electronic musical instrument has a plurality of tone signal generating channels each for generating a tone signal representative of a tone to be produced. Keys depressed on an associated keyboard are assigned to the tone signal generating channels to cause them to generate tone signals corresponding to the depressed keys. When an automatic accompaniment circuit is actuated, a predetermined number of ones of the plurality of tone signal generating channels are reserved for generation of tone signals of the accompaniment. The reservation is made such that those channels which are idle are selected at the highest priority, those channels to which the earliest released keys are assigned at the second highest priority, and those channels to which the earliest depressed keys are assigned at the third highest priority.

Abstract: There is provided a data processing circuit for processing symbol data read from a disc of a digital audio system such as a DAD player. Each of the symbol data read from the disc is first stored into a buffer register and then transferred therefrom to a symbol memory in accordance with internal pulse signals, and the number of the pulse signals generated during a period required to process one frame of symbol data is greater than that of symbol data contained in one frame of symbol data. An address data for addressing a desired area of the symbol memory is formed by adding a reference address data generated by counting the internal frame synchronization signals to a relative address data generated by adding together a specific pair of addressing data read out from an address memory, the address memory storing a plurality of groups of addressing data to be used in accordance with each mode of operation of this circuit.

Abstract: In construction of a shadow mask for color picture tubes, use of Invar for the shadow mask suppresses thermal deformation caused by electron beam impingement and provision of a four pole magnet frame surrounding each mask aperture causes increased convergence of electron beams, thereby enabling production of images with high resolution and brightness.

Abstract: An electronic musical instrument allows the performer to control tone volume of a rhythmic tone by a simple manipulation of keys of a keyboard. The electronic musical instrument comprises a rhythmic tone generator including a plurality of tone sources, to which a group of keys of the keyboard are assigned, respectively. Each of the tone sources generates a rhythmic tone when a corresponding one of the group of keys is depressed. When it is desired to give an accent to the rhythmic tone, a key adjacent the depressed tone source designating key is additionally depressed. This multiple key-depression is detected by a detection circuit. Tone volume of the rhythmic tone generated by the tone source is controlled in accordance with the detection of the multiple key-depression.