Roland Corporation

Roland Kabushiki Kaisha

Atsushi Hoshiai

Satoshi Kusakabe

Tadao Kikumoto

Kenji Hirano

Kenji Sato

Koji Iida

Hiroyuki Endo

Provided are a memory device and waveform data editing method and editing program thereof. Waveform data obtained by sampling a musical sound is acquired, and a difference between a harmonic frequency of an nharmonic of the waveform data and a resonance sound frequency of the nharmonic sound of a resonance sound generation circuit is calculated, and if the difference is 1 Hz or more, a waveform of a frequency component of 20 Hz centered on a central of the frequency of the nharmonic of a frequency spectrum is clipped. The difference calculated in regard to the clipped waveform is reduced. The waveform and the clipped original waveform are combined to edit the waveform data. Thus, in the waveform data, the difference between the harmonic frequencies of the resonance characteristic is eliminated, and resonance is facilitated and occurrence of beat of the sound is prevented.

Memory device, waveform data editing method

An electronic musical instrument enables a phrase that is stored as audio waveform data to be played back at an arbitrary tempo. The instrument includes an operator that allows the performer to change the readout position of the waveform data manually, enabling the performer to increase, decrease or reverse the speed of waveform data playback temporarily. Upon ceasing use of the operator, the playback of the waveform data returns to synchronization with the previously set tempo at a readout position that would be the current readout position had the operator not been used by the performer.

Electronic musical instrument

The present invention relates to an audio waveform reproduction apparatus for reproducing a recorded audio waveform at a reproduction tempo that can be specified as desired, and its object is to achieve that the reproduction does not deviate from the tempo when performed at a tempo that is different from the tempo at the time of recording of the audio waveform. The audio waveform reproduction apparatus includes a storage means for storing waveform data of the audio waveform, an input means for inputting reproduction tempo information, a first information production means for producing first information (TP) that is a time function based on the reproduction tempo information, a second information production means for producing second information (PP) that is a time function based on time axis compression/expansion information (TR), a compression/expansion information production means for comparing the first information and the second information and calculating the time axis compression/expansion information (TR) towards matching the temporal change of the second information with the temporal change of the first information, and a time axis compression/expansion processing means for performing time axis compression/expansion processing based on the time axis compression/expansion information (TR) to produce a reproduction audio waveform, wherein the first information (TP) and the second information (PP) represent positions on a common axis.

Audio waveform reproduction apparatus

An apparatus and method for compression and expansion of a wave signal on a time axis. A memory device stores waveform data representative of a waveform for each sub-frequency band of each main-frequency band of a wave signal, in which the wave signal is divided into a plurality of the main-frequency bands, each of the main-frequency bands is divided into a plurality of the sub-frequency bands. A plurality of time axis compression and expansion devices are provided for each of the sub-frequency bands for performing time axis compression and expansion of the waveform. A mixing device mixes signals provided from the time axis compression and expansion devices. Each of the time axis compression and expansion devices performs compression and expansion in a sampling rate that corresponds to one of the main-frequency bands that includes the sub-frequency band that is subject to the waveform time axis compression and expansion, wherein the sampling rate of at least one of the main-frequency bands is different from the sampling rate of at least one other of the main frequency bands.

Waveform signal compression and expansion along time axis having different sampling rates for different main-frequency bands

To make possible the smooth compression and expansion of an audio signal without directly culling out or repeating a prescribed segment of the audio signal, in other words, the waveform, by the use of a phase vocoder format and, together with this, making it possible to compress and expand an audio signal that has an abundance of changes. The system includes a storage device in which the data regarding the changes in the amplitude and the frequency of the waveform that accompany the passage of time are stored. The system also includes a time position data generator in which the time position data that indicate the time positions that change such that the time positions of the waveform retrace the passage of time are generated in order. The system also includes a waveform reproducer in which, from the storage means, the amplitude and the frequency data that correspond to the time position of the waveform that indicates the time position data that are generated by the time position data generating means are read out and a waveform that is based on said read out amplitude and frequency is output.

Waveform reproduction apparatus

A method for generating a compressed or expanded waveform from original waveform data is disclosed. A plurality of frequency band-divided waveform data is generated from the original waveform data. Phase and amplitude data having periodically changing amplitudes are extracted for each of the plurality of frequency band-divided waveform data. The periodically changing phase data is converted to periodically changing frequency data, and a temporal change rate of the periodically changing amplitude and frequency data is adjusted for each of the plurality of frequency band-divided waveform data. The temporally adjusted amplitude and frequency data for the plurality of frequency band-divided waveform data is then combined to generate the compressed or expanded waveform.

An object of the present invention is to obtain musical tones being equivalent to those of an acoustic guitar with a hollow body with only an electric guitar with a solid body. For the sake of attaining this object, the effecting system according to the present invention is composed of an absolute value detecting means for detecting absolute values of musical tone signals in response to oscillations of the strings, a delay time setting means for setting a delay time based on the absolute values detected by the above described absolute value detecting means, and a delay means for delaying the above described musical tone signals by the delay time which was set by the above described delay time setting means.

Effect adding system capable of simulating tones of stringed instruments

A musical tone signal forming apparatus includes a pickup which detects vibrations of a string of an electric guitar and produces a string vibration signal. The string vibration signal and the output of a first delay imparting a first delay time are combined in a first combiner. Second and third delays impart second and third delay times to the string vibration signal, respectively. Delayed signals from the second and third delays are combined in a second combiner. Outputs of the first and second combiners are combined in a third combiner. The first delay time is determined by the distance between a bridge and a first imaginary pickup supposed to detect vibrations of the string. The second delay time is determined by the distance between the first imaginary pickup and a second imaginary pickup supposed to be disposed nearer to the bridge. The third delay time is determined by the distance between the bridge and the mid-point of the first and second imaginary pickups.

Musical tone signal forming apparatus for use in simulating a tone of

A musical tone signal forming device for an electric string music instrument having at least one pickup for detecting and delivering vibration of a string as an electric musical sound signal, including at least one comb filter having the electric musical sound signal as an input thereof; and structure for producing parameters corresponding to a specific position, which differs from a position of the pickup with respect to the string, at which an imaginary pickup is disposed and a reference vibration frequency of the string and supplying the parameters to the at least one comb filter to determine a frequency characteristic of the at least one comb filter, wherein the frequency characteristic of the at least one comb filter simulates a frequency characteristic of the electric musical sound signal delivered from the imaginary pickup disposed at the specific position.

Musical tone signal forming device for a stringed musical instrument

An improved waveform generator used in an electronic musical equipment for reproducing musical sounds stored therein, in which the waveform of each musical sound is stored in a memory as a sequence of amplitudes sampled at specific sampling points on the waveform and reproduced therefrom by interpolating arithmetically any point between these sampling points.

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Shizuoka, Japan

Atsushi Hoshiai