Patents by Inventor Gen Izumisawa

Gen Izumisawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7642445
    Abstract: A music sound generator imitates released key string vibration sounds (RKSV) and cabinet resonances of an acoustic piano. When a key is pressed, waveform is readout from a normal music sound waveform memory 15. The normal sound waveform is inputted into a filter 21, and inputted into a filter 22 through a band-pass filter 33. Output waveform of a cabinet resonance waveform memory 17 is inputted into a filter 23 when the key is pressed. Outputs of the filters are synthesized by an adder 27 through multipliers 24 through 26. When the key is pressed, a cut-off frequency of the filter 22 is sufficiently low and RKSV is not generated. If the damper is not on when key-releasing, the cut-off frequency is returned to normal and RKSV is generated. A level controller 32 attenuates the RKSV and the cabinet resonance for a longer time than the normal music sound.
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: January 5, 2010
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Gen Izumisawa
  • Patent number: 7476797
    Abstract: According to which a damper is operated before or after keying, one of two resonances is generated. A second waveform storage 18 storing original waveform data of a first resonance based on a music sound including an impact sound of keying according to a before-key-pressing pedaling, and a third waveform storage 19 storing original waveform data of a second resonance based on a music sound which does not include an impact sound of keying according to an after-key-pressing pedaling, are provided. A switch 20 is switched according to the state of the pedal at the time of key pressing to supply selected resonance waveform data to a resonance generating unit 16. The resonance signal outputted from the resonance generating unit 16 and a music sound signal of a direct sound of keying are added by an adder 24 and inputted into a sound system.
    Type: Grant
    Filed: January 18, 2007
    Date of Patent: January 13, 2009
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventors: Gen Izumisawa, Akihiro Fujita, Katsushi Ishii
  • Publication number: 20080245213
    Abstract: A music sound generator imitates released key string vibration sounds (RKSV) and cabinet resonances of an acoustic piano. When a key is pressed, waveform is readout from a normal music sound waveform memory 15. The normal sound waveform is inputted into a filter 21, and inputted into a filter 22 through a band-pass filter 33. Output waveform of a cabinet resonance waveform memory 17 is inputted into a filter 23 when the key is pressed. Outputs of the filters are synthesized by an adder 27 through multipliers 24 through 26. When the key is pressed, a cut-off frequency of the filter 22 is sufficiently low and RKSV is not generated. If the damper is not on when key-releasing, the cut-off frequency is returned to normal and RKSV is generated. A level controller 32 attenuates the RKSV and the cabinet resonance for a longer time than the normal music sound.
    Type: Application
    Filed: October 17, 2007
    Publication date: October 9, 2008
    Inventor: Gen Izumisawa
  • Publication number: 20070175318
    Abstract: According to which a damper is operated before or after keying, one of two resonances is generated. A second waveform storage 18 storing original waveform data of a first resonance based on a music sound including an impact sound of keying according to a before-key-pressing pedaling, and a third waveform storage 19 storing original waveform data of a second resonance based on a music sound which does not include an impact sound of keying according to an after-key-pressing pedaling, are provided. A switch 20 is switched according to the state of the pedal at the time of key pressing to supply selected resonance waveform data to a resonance generating unit 16. The resonance signal outputted from the resonance generating unit 16 and a music sound signal of a direct sound of keying are added by an adder 24 and inputted into a sound system.
    Type: Application
    Filed: January 18, 2007
    Publication date: August 2, 2007
    Inventors: Gen Izumisawa, Akihiro Fujita, Katsushi Ishii
  • Patent number: 6184453
    Abstract: When a low-pass filter 204 cuts a loud tone component from a waveform signal that soft and loud tone components are synthesized, and outputs a soft tone component signal, and a high-pass filter 205 cuts a soft tone component from the waveform signal that soft and loud tone components are synthesized, and outputs a loud tone component signal, the outputs at this time are switched on the basis of tone information (touch information, pitch information, tone color information, and the like).
    Type: Grant
    Filed: February 8, 2000
    Date of Patent: February 6, 2001
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Gen Izumisawa
  • Patent number: 5936182
    Abstract: A musical sound synthesizing apparatus synthesizes plural-series overtones having different inharmonicity and amplitude level so as to generate a musical sound close to a natural sound. Inharmonicity coefficients K1 and K2 are read out for each overtone of different series in accordance with a timbre and a pitch, preferably modified according to a touch velocity, and then inputted to the first and second overtone frequency generators 19 and 20. Two series of overtones respectively computed in first and second overtone generators 21 and 22 on the basis of fundamental and overtone frequencies computed using of the coefficients K1 and K2, are controlled in its amplitude by the multipliers 25 and 26, and then synthesized so as to be outputted as a musical sound signal. In the multipliers 25 and 26, respective overtones are multiplied by amplitude coefficients Lk1 and Lk2 determined for each series in accordance with the touch velocity so that their amplitude levels are modified.
    Type: Grant
    Filed: June 22, 1998
    Date of Patent: August 10, 1999
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Gen Izumisawa
  • Patent number: 5666432
    Abstract: A start portion of sampled sound data is cleared, and the resultant sound data free from the start portion is modified into data increasing gradually from level "0". Thus, noise in the start portion of the recorded sound data is removed, and also sound data gradually increasing from level "0" at the start can be obtained, that is, a discontinuous point after the noise removal is precluded.
    Type: Grant
    Filed: February 18, 1994
    Date of Patent: September 9, 1997
    Assignee: Kawai Musical Inst. Mfg. Co., Ltd.
    Inventor: Gen Izumisawa
  • Patent number: 5637821
    Abstract: A musical sound generating device has a waveform memory to store musical sound waveform data to be read-out repeatedly between a loop-top address (integral address) and a loop-end address (integral address). The same musical sound waveform data is stored at the loop-top address and the loop-end address. An address computing circuit computes a read-out address, including a decimal part, to repeatedly read out the musical sound waveform data stored between the loop-top address and the loop-end address in the waveform memory. An interpolating circuit carries out interpolation if the read-out address generated by the address computing circuit includes a decimal part. Interpolation is carried out by dividing in proportion the musical sound waveform data read out from the waveform memory using an integral part of the read-out address and the musical sound waveform data read out from the waveform memory using a value obtained by adding 1 to the integral part of the read-out address according to the decimal part.
    Type: Grant
    Filed: February 6, 1996
    Date of Patent: June 10, 1997
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventors: Gen Izumisawa, Yutaka Washiyama
  • Patent number: 5541357
    Abstract: In the sound source system, the waveform sampled from the sounds of keys pressed down with two or more kinds of intensity are synthesized in a specified rate, thereby forming the waveform of the sounds of keys pressed down with the other kind of intensity. Thus, almost the actual instrumental deep sounds can be reproduced. The sound waveform sampled from weak key presses is passed through a low pass filter, and the filtered waveform composed only of low order harmonic components is transformed to weak press data in the pulse code modulation system for the storage. Similarly, the sound waveform sampled from strong key presses are passed through a high pass filter, thereby removing the low order harmonic components. The filtered waveform composed only of the high order harmonic components are transformed to strong press data in the pulse code modulation system for the storage. The high pass filter can remove the frequency components which pass through the low pass filter.
    Type: Grant
    Filed: June 2, 1994
    Date of Patent: July 30, 1996
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventors: Hiroshi Sato, Gen Izumisawa, Jiro Tanaka, Kiyomichi Kushimiya
  • Patent number: 5478968
    Abstract: A moment at which each of a plurality of pieces of sound data is generated in response to one sounding operation is controlled, and the plurality of pieces of sound data are output to different sounding units. Consequently, differences occur among moments at which sounds are radiated by the sounding units, resulting in an occurrence of differences among lengths of time taken by the sounds to reach the ears of a listener, whereby a stereophonic sound can be produced and the listener can localize a sound image.
    Type: Grant
    Filed: December 27, 1991
    Date of Patent: December 26, 1995
    Assignee: Kawai Musical Inst. Mfg. Co., Ltd.
    Inventors: Hiroshi Kitagawa, Gen Izumisawa
  • Patent number: 5473108
    Abstract: An electronic musical instrument reads data of a musical tone from a waveform memory thereof according to pitch information input thereto, to form a tone signal containing a tone amplitude signal indicative of amplitude of the musical tone. The tone signal is passed into a plurality of signal paths to be formed into a plurality of analog tone signals. The plurality of signals paths each amplify the tone amplitude signal according to a note on/off velocity, and attenuate a plurality of modifications of the tone signal, depending on or not depending on the note on/off velocity and the pitch information on the musical tone, to generate a musical tone suitably reflecting the note on/off velocity and the pitch.
    Type: Grant
    Filed: January 6, 1994
    Date of Patent: December 5, 1995
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventors: Eiji Matsuda, Gen Izumisawa, Hiroshi Kitagawa
  • Patent number: 5455380
    Abstract: An electronic musical instrument changes sound effects, such as resonance and reverberation, during a performance. The instrument has a tone-ON channel counter, for counting keys that are simultaneously depressed; an output channel determination unit, for determining an output channel in consonance with a count value held by the tone-ON channel counter; and an output channel selector, for designating the output channel, so as to provide a desired sound effect through the selected output channel.In a modification, the instrument has a parameter value determination unit, for determining a parameter value in consonance with a count value counted by the tone-ON channel counter; a resonant tone production unit, for adding a desired sound effect; and a controller, for employing the parameter value to control the resonant tone production unit.
    Type: Grant
    Filed: December 10, 1993
    Date of Patent: October 3, 1995
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventors: Eiji Matsuda, Gen Izumisawa
  • Patent number: 5428183
    Abstract: A tone signal generating apparatus, including a memory for storing wave data containing frequency components within a full band; a tone generator for reading the wave data from the memory in accordance with key ON/OFF data to generate a tone signal; a velocity generator for generating a velocity value based on key ON/OFF data; a first coefficient processor for producing a first coefficient to control the amplitude in accordance with the velocity value generated by the velocity generator; a first operator for performing an operation on the first coefficient produced by the first coefficient processor and the tone signal generated by the tone generator, a filter for extracting frequency components within a specific band from the tone signal output from the first operator to produce a first tone signal and outputting the first tone signal; a second coefficient processor for producing a second coefficient to control the amplitude in accordance with the velocity value generated by the velocity generator; and a sec
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: June 27, 1995
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventors: Eiji Matsuda, Hiroshi Kitagawa, Gen Izumisawa, Jiro Tanaka
  • Patent number: 5288940
    Abstract: A tone generating apparatus which comprises a wave memory in which first tone waveform data with a preselected length extracted from an attack portion of a musical tone and second tone waveform data with a preselected length following the first tone waveform data and having a value of zero are stored. A read circuit reads the first tone waveform data only once from the wave memory and subsequently reads the second tone waveform data repeatedly. A tone generator generates a musical tone based on the tone waveform data read out by the read circuit. In reading out tone waveform data from the wave memory, the first tone waveform data is read out first, followed by repetitive reading of only the second tone waveform data.Repetitive reading of the second tone waveform data produces no sound because the contents of the second tone waveform data are zero. Thus, this system performs a function equivalent to tone release effected by reading out a one-shot waveform.
    Type: Grant
    Filed: January 14, 1993
    Date of Patent: February 22, 1994
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Gen Izumisawa
  • Patent number: 5221803
    Abstract: A tone generating apparatus comprising a first tone signal generator including the same number of oscillators as a polyphonic number each for generating a tone signal of that tone component of tone components constituting a musical tone which has a relatively long tone-ON time; a first assigner for assigning tone generation to one of the oscillators of the first tone signal generator; a second tone signal generator including oscillators each for generating a tone signal of a different one of the tone components constituting a musical tone than the tone component having a relatively long tone-ON time, a quantity of the oscillators being less than the polyphonic number; and a second assigner for assigning tone generation to one of the oscillators of the second tone signal generator, whereby when a tone generation is specified, a tone signal output from one of the oscillators of the first tone signal generator assigned by the first assigner and a tone signal output from one of the oscillators of the second tone
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: June 22, 1993
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventors: Gen Izumisawa, Yasushi Sato, Akiko Komatsu
  • Patent number: 5185491
    Abstract: A method for processing a waveform includes the steps of dividing an original musical tone into head data, mix data, and loop data. The data is subjected to several processing steps, including cross-fade mixing. All processing steps are carried out before the processed waveform is stored in memory. Therefore, when the stored data is read out to reproduce the original musical tone, no interpolation steps are required to link the head, mix, and loop data together because that data has been smoothly linked together prior to storage in the memory. As each musical tone is read out, the head data is read out first, followed by the mix data, and then the loop data is read out in alternating directions. The smoothly linked head, mix, and loop portions of the musical tone provide a pleasing reproduction of the original musical tone.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: February 9, 1993
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventors: Gen Izumisawa, Yasushi Sato
  • Patent number: 5146834
    Abstract: A tone generating apparatus comprises a wave memory, an address calculator, an interpolating circuit. In the wave memory is stored tone wave data of a single period to be repeatedly read out stored between a loop top address (integer address) and an address preceding by "1" a loop end address (integer address), same tone wave data as stored at the loop top address being stored at the loop end address. The address calculator generates a read address including a fraction portion, which sequentially increases from the loop top address of the wave memory toward the loop end address at an interval corresponding to a pitch, and returns to the loop top address when exceeding the loop end address.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: September 15, 1992
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventors: Gen Izumisawa, Yutaka Washiyama