Yamaha Corporation

Nippon Gakki Seizo Kabushiki Kaisha

Iwao Higashi

Toshifumi Kunimoto

Toru Kitayama

Chifumi Takeuchi

Akira Yamauchi

Yasuyuki Umeyama

Tomoyuki Funaki

Eiichiro Aoki

Hideyuki Masuda

Takuro Sone

Yoichiro Ogai

Masahiro Koyama

Mitsuru Fukui

When sound parameters defining a selected element among plural elements constituting a sound are edited, a predetermined schematic display of the entire elements constituting the sound is made and, also, a particular part of the schematic display corresponding to the selected element in a special form is made about the selected element for emphasizing it. An operator can thereby recognize easily for which part of element in the entire sound structure he is currently making the parameter editing. In response to designation of a desired object of editing by the operator, plural possible candidates of edition processings corresponding to the designated object are displayed. Upon selection of one of the plural processings by the operator, the selected editing processing is automatically performed.

Sound parameter editing device for an electronic musical instrument

In a device which excites an oscillating signal in a closed loop containing a delay circuit and a filter so as to synthesize a sound of pitch corresponding to the total delay time in the closed loop, arithmetic operations are performed in the closed loop, in response to a change in a color controlling coefficient caused during generation of the sound, for interpolating delayed output signals from plural points in the loop having different delay time. This interpolation compensates for a variation in the signal delay time in the closed loop resultant from the change in the filter coefficient, to allow the entire closed loop to provide such a total delay time that excites oscillation corresponding to a desired pitch. The closed loop also includes first and second filters. When generation of the sound is to be started, the delay time adjustment or pitch modification is performed by using, as the first filter, an all-pass filter that has the advantage of having no adverse effect on the frequency characteristic of sound. During generation of the sound, so as to avoid the adverse effect resultant from a variation in the coefficient of the all-pass filter, variable control of the delay time or variation control of the pitch is performed by using, as the second filter, a low-pass filter that functions as a delay interpolator.

Digital sound synthesizing device using a closed wave guide network with

A tone signal control system for controlling a tone signal supplied from a tone generator. The tone signal control system includes a CPU for executing a computational and control operation in accordance with an externally stored program, a DSP for executing a computational and control operation in accordance with an internally stored program, a memory accessible by both CPU and DSP, and an access controller for controlling an access by CPU and DSP to the memory. The access controller calculates a logical product of a clock signal, an access signal from CPU, and an access signal from DSP, and outputs the logical product as a CPU wait signal. The tone signal control system is not required to increase the number of pins too many even if CPU and DSP are assembled on a single chip.

Electronic tone generator system with CPU and DSP

Electronic musical instrument comprises a musical tone synthesis device, a memory and pitch control device. The musical tone synthesis device processes input signals based on at least one parameter, and synthesizes and outputs musical tones with pitches in accordance with the values of the parameters. The memory stores initial values of the parameters which generate a musical tone having a target pitch. The pitch control device detects a difference between the target pitch of the musical tone and a pitch of the musical tone outputted form the musical tone synthesis device. And, the pitch control device outputs a value of the parameter which will eliminate the difference to the musical tone synthesis device.

Waveguide electronic musical instrument employing pre-performance tuning

The musical tone synthesizing apparatus is mainly configured by a closed loop which at least provides a delay circuit and an all-pass filter. The delay circuit delays an input signal (e.g., excitation wave signal) by a first delay time corresponding to a certain integral number of sampling periods. The all-pass filter functions to at least delay an output of the delay circuit by a second delay time corresponding to a decimal fraction of the sampling period, so that an output of the all-pass filter is fed back to the delay circuit. The whole delay time of the closed loop consists of the first and second delay times which can be respectively controlled. Thus, a musical tone signal representing a synthesized musical tone (e.g., an attenuating sound which is produced from an percussion instrument) is picked up from the closed loop. Incidentally, the whole configuration of the closed loop can be embodied by a digital signal processor (DSP).

Musical tone synthesizing apparatus utilizing an all-pass filter having

An electronic musical instrument: is provided to perform an active control on the pitch of the musical tone to be generated, thereby simulating the pitch-rising phenomenon to be occurred in the performance of a non-electronic musical instrument such as a wind instrument, percussion instrument and stringed instrument. In case of the simulation of the wind instrument, this electronic musical instrument is mainly configured by an excitation-vibration circuit and a tube simulation circuit which are connected together by means of a junction. The tube simulation circuit is configured by a closed-loop circuit in which plural delay circuits and junction circuits are connected together in cascade-connection manner. Herein, the delay circuits simulate the propagation delay of the air-pressure wave to be transmitted through the tube of the wind instrument, while the junction circuits simulate the scattering manner of the air-pressure wave at the points at which the diameter of the tube is changed. The number of the delay stages which are required to simulate the musical sound is controlled to be changed in a lapse of time.

Electronic musical instrument capable of simulating small pitch

An electronic musical instrument includes a plurality of tone generating substrates, a connection portion, a channel detector and a channel assigner. Each of the plurality of tone generating substrates has at least one tone generation channel which generates a tone signal in response to assignment information input thereto. The connection portion has a plurality of connection slots with which the tone generating substrates are connected. The channel detector detects a number of all the tone generation channels of the tone generating substrates connected with the connection portion. The channel assigner, responsive to performance information input thereto, assigns the performance information as assignment information to one of the tone generation channels detected by the channel detector. The assigned tone generation channel generates a tone signal in accordance with the performance information.

Electronic musical instrument connectable with a plurality of tone

A method of detecting localization of an acoustic image, in which an acoustic impulse is emitted from a sound source to a dummy of a human head, an acoustic sensor is provided to a portion of the dummy's ears, and the response waveform is received by the acoustic sensor. This enables the detection of what effects are derived from interruption, reflection, and the like of a tone due to the human head. The received response waveform is analyzed and parameters for an acoustic image localization system are obtained. The acoustic image localization system comprising a delay circuit, a filter and an amplification controller sets the parameters into the delay circuit, the filter and the amplification controller, so that the detected localization of an acoustic image is reproduced.

Method of detecting localization of acoustic image and acoustic image

An electronic musical instrument includes an excitation signal generating device, a plurality of loop circuits and a coupling circuit. The excitation signal generating device generates an excitation signal in accordance with musical tone designating information. Each of the plurality of loop circuits at least delays an input signal in response to the musical tone designating information and repeatedly circulates the input signal therein. The excitation signal generated by the excitation signal generating device is supplied to at least one of the plurality of loop circuits as an input signal. The coupling circuits couples the plurality of loop circuits in accordance with a predetermined coupling form. At least one signal circulated in at least one of the plurality of loop circuits is output as a musical tone signal to be generated. The electronic musical instrument further includes a memory circuit which stores a plurality of coupling forms. The coupling forms respectively indicates how to couple input and output terminals of the plurality of loop circuits. The input and output terminals are coupled to each other in accordance with one of the plurality of coupling forms.

Electronic musical instrument including a configurable tone synthesizing

A desired sound signal that is input from outside is amplitude-modulated or frequency-modulated with a signal of a predetermined characteristic which is generated from a signal generating source. A frequency characteristic controlling circuit controls the frequency characteristic of the modulated sound signal in accordance with a characteristic of a tone to be generated, and it outputs the controlled signal as a tone signal.

Device for generating tone signals using modulation

A musical tone synthesizing apparatus provides a time-varying signal processing circuit the transfer function of which gradually varies over time in order to gradually vary over time the tone color of a synthesized musical tone. A number of time-varying signal processing circuits are presented. An interpolation-type-time-varying signal processing circuit is provided with interpolators for interpolating control parameters generated based on a desired musical tone, a signal processing circuit carrying out a signal operation based on the interpolated control parameters on an input signal incomming thereto. A mixing-type or distribution-type time-varying signal processing circuit is provided with a plurality of signal processing circuits for carrying out signal operations based on control parameters on input signals, and with a mixer which mixes the output signals of the signal processing circuits in such a way that the mixing ratio gradually varies over time or with a distribution circuit which distributes an input signal to the signal processing circuits in such a way that the distribution ratio gradually varies over time.

Musical tone synthesizing apparatus having smoothly varying tone control

The present invention provides a signal delay circuit for substantially steplessly changing a delay interval. The signal delay circuit is composed essentially of a delay controller, a first delay circuit, and a second delay circuit. The delay controller generates and outputs control data consisting of a real number bearing control information for controlling the delay interval, the real number consists of an integral portion and a fractional portion. The first delay circuit receives an incidental signal, delays the incidental signal for creating a first intermediate signal, and outputs the first intermediate signal, the first intermediate signal being delayed with respect to the incidental signal by an interval which is a product of a predetermined cardinal interval and the integral portion of the real number. The second delay circuit receives the first intermediate signal, produces at least one second intermediate signal by delaying the first intermediate signal by at least one interval which is an integral multiple of the predetermined cardinal interval, interpolates the first intermediate signal and said at least one second intermediate signal for producing a delayed signal, and outputs the delayed signal, the delayed signal being delayed with respect to the first intermediate signal by an interval which is a product of the predetermined cardinal interval and the fractional portion of the real number. As a result, the delayed signal is delayed with respect to the incidental signal by a delay interval which is a product of the predetermined cardinal interval and the real number output by the delay control means.

Signal delay circuit, FIR filter and musical tone synthesizer employing

A musical tone waveform signal forming apparatus comprises a waveform signal transmission section, a musical tone control signal input section and a pitch control section. The waveform signal transmission section comprises a plurality of signal transmission units which are connected in cascade one by one and each of which comprises first and second signal lines respectively serving as forward and backward paths of a waveform signal and a node portion for feeding back an output from the first signal line to an input side of the second signal line. At least one of the first and second signal lines serves as a signal delay line. The musical tone control signal input section receives the waveform signal from the waveform signal transmission section and a musical tone control signal for controlling musical tone parameters of a musical tone to be generated to change the waveform signal in accordance with the musical tone control signal and output the changed waveform signal to the waveform signal transmission section. The pitch control section changes delay times of the signal delay lines in accordance with a pitch signal, one of the tone control signal, for controlling a tone pitch of the musical tone to be generated.

Musical tone waveform signal forming apparatus having pitch control means

A musical tone waveform signal forming apparatus having a modulation function comprises a delay loop system including a delay circuit and a filter, a excitation signal input section, a control member and a filter characteristic control circuit. The excitation signal input to the delay loop system circulate therein, so that a musical tone signal is formed. The control member instructs modulation of a musical tone signal. The filter characteristic control circuit changes with time the characteristics of the filter in accordance with an output from the control member. So that pitch modulation accompanied with tone color modulation is effected.

Musical tone waveform signal forming apparatus having pitch and tone

An electronic musical instrument includes an excitation circuit, a closed loop circuit, a characteristics analysis circuit and a control circuit. The excitation circuit generates an excitation signal in response to performance information. The closed loop circuit causes the excitation signal inputted from the excitation circuit to circulate thereabout musical tone signal. The closed loop circuit also has a delay circuit for delaying the musical tone signal for a predetermined time. The characteristics analysis circuit analyzes an input signal and generates a control signal corresponding to the result of the analysis of the input signal. The control circuit controls characteristics of the musical tone signal circulating in the closed loop circuit in response to the control signal. The musical tone signal circulating in the closed loop circuit is then outputted therefrom as a sound signal.

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Hamamatsu, Japan

Iwao Higashi