Musical note generation device, electronic musical instrument, method, and storage medium

Patent metadata

Field	Value
Publication number	US-10109268-B2
Application number	US-201715845805-A
Country	US
Kind code	B2
Filing date	Dec 18, 2017
Priority date	Dec 26, 2016
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

A musical note generation device includes at least one processor that performs a process of generating attenuated sound waveform data by respectively reducing, among frequency components included in first sound waveform data corresponding to pitch information associated with a specified key, amplitudes of respective frequency components of a fundamental tone and harmonics of the fundamental tone corresponding to a pitch indicated by the pitch information; a process that convolves the generated attenuated sound waveform data generated with second sound waveform data corresponding to at least one of a high sound range side impulse response and a low sound range side impulse response, so as to generate third sound waveform data; and a process of outputting piano sound waveform data generated on the basis of the third sound waveform data generated by the convolution process.

First claim

What is claimed is:

1. A musical note generation device, comprising:
a plurality of keys, the plurality of keys respectively being associated with pitch information; and
at least one processor, the at least one processor performing the following processes:
an attenuated sound waveform data generation process of generating attenuated sound waveform data by respectively reducing, among frequency components included in first sound waveform data corresponding to the pitch information associated with a specified key, amplitudes of respective frequency components of a fundamental tone and harmonics of the fundamental tone corresponding to a pitch indicated by the pitch information;
a convolution operation process that convolves the attenuated sound waveform data generated by the attenuated sound waveform data generation process with second sound waveform data corresponding to at least one of a higher pitch side impulse response and a lower pitch side impulse response, so as to generate third sound waveform data, the higher pitch side impulse response having relatively higher pitch components than the lower pitch side impulse response; and
an output process of outputting piano sound waveform data generated on the basis of the third sound waveform data generated by the convolution operation process.

2. The musical note generation device according to claim 1 ,
wherein the first sound waveform data includes at least a sound obtained from vibration of a string struck due to a keypress being performed while not depressing a damper pedal in a keyboard instrument, and
wherein the second sound waveform data are impulse response waveform data for resonant tones obtained from vibration of a plurality of strings included in the keyboard instrument that is caused by vibrating at least one of a higher pitch side and a lower pitch side of the keyboard instrument while depressing the damper pedal of the keyboard instrument, the higher pitch side of the keyboard instrument generating relatively higher pitch sounds than the lower pitch side of the keyboard instrument.

3. The musical note generation device according to claim 1 ,
wherein said plurality of keys is grouped into a plurality of higher pitch keys and a plurality of lower pitch keys that are associated with pitches lower than pitches associated with the plurality of higher pitch keys, and
wherein in the convolution operation process, when a key of the plurality of lower pitch keys is pressed, the attenuated sound waveform data is convolved with the second sound waveform data corresponding to the lower pitch side impulse response, and when a key of the plurality of higher pitch keys is pressed, the attenuated sound waveform data is convolved with the second sound waveform data corresponding to the higher pitch side impulse response.

4. The musical note generation device according to claim 1 , wherein in the attenuated sound waveform data generation process, the at least one processor identifies the respective frequency components of the fundamental tone and the harmonics with a comb filter.

5. The musical note generation device according to claim 1 , wherein in the attenuated sound waveform data generation process, the at least one processor generates the attenuated sound waveform data by performing a delay process corresponding to the specified key on the first sound waveform data.

6. The musical note generation device according to claim 1 , wherein the at least one processor performs the attenuated sound waveform data generation process, the convolution operation process, and the output process when a damper pedal is depressed.

7. A musical note generation device, comprising:
a plurality of keys, the plurality of keys respectively being associated with pitch information; and
at least one processor, the at least one processor performing processes including:
an attenuated sound waveform data generation process of generating attenuated sound waveform data by respectively reducing, among frequency components included in first sound waveform data corresponding to the pitch information associated with a specified key, amplitudes of respective frequency components of a fundamental tone and harmonics of the fundamental tone corresponding to a pitch indicated by the pitch information;
a convolution operation process that convolves the attenuated sound waveform data generated by the attenuated sound waveform data generation process with second sound waveform data corresponding to at least one of a higher pitch side impulse response and a lower pitch side impulse response, so as to generate third sound waveform data, the higher pitch side impulse response having relatively higher pitch components than the lower pitch side impulse response; and
an output process of outputting piano sound waveform data generated on the basis of the third sound waveform data generated by the convolution operation process.

8. The musical note generation device according to claim 7 , wherein the at least one processor performs the following processes:
in the attenuated sound waveform data generation process, a process of generating first attenuated sound waveform data by multiplying, by a higher pitch side effect application factor, sound waveform data in which the amplitudes of the respective frequency components of the fundamental tone and harmonics are respectively reduced, and a process of generating second attenuated sound waveform data by multiplying, by a lower pitch side effect application factor, the sound waveform data in which the amplitudes of the respective frequency components of the fundamental tone and harmonics are respectively reduced, and
in the convolution operation process, a process of convolving the first attenuated sound waveform data with the second sound waveform data corresponding to the higher pitch side impulse response, a process of convolving the second attenuated sound waveform data with the second sound waveform data corresponding to the lower pitch side impulse response, and a process of generating the third sound waveform data from the respectively convolved sound waveform data.

9. An electronic musical instrument, comprising:
a damper pedal; and
the musical note generation device as set forth in claim 1 ,
wherein the at least one processor of the musical note generating device performs the attenuated sound waveform data generation process, the convolution operation process, and the output process when the damper pedal is depressed.

10. A method to be executed by a processor in an electronic musical instrument, comprising:
an attenuated sound waveform data generation process of generating attenuated sound waveform data by respectively reducing, among frequency components included in first sound waveform data corresponding to pitch information associated with a specified key, amplitudes of respective frequency components of a fundamental tone and harmonics of the fundamental tone corresponding to a pitch indicated by the pitch information;
a convolution operation process that convolves the attenuated sound waveform data generated by the attenuated sound waveform data generation process with second sound waveform data corresponding to at least one of a higher pitch side impulse response and a lower pitch side impulse response, so as to generate third sound waveform data, the higher pitch side impulse response having relatively higher pitch components than the lower pitch side impulse response; and
an output process of outputting piano sound waveform data generated on the basis of the third sound waveform data generated by the convolution operation process.

11. A non-transitory storage medium having stored therein instructions that cause a proc

Assignees

• Casio Computer Co Ltd

Inventors

• Sakata Goro

Classifications

• G10H2250/145

  Convolution, e.g. of a music input signal with a desired impulse response to compute an output · CPC title

• G10H1/32 Primary

  Constructional details · CPC title

• G10H1/08 Primary

  by combining tones (G10H1/14, G10H1/16 take precedence; chord G10H1/38) · CPC title

• G10H2210/271

  Sympathetic resonance, i.e. adding harmonics simulating sympathetic resonance from other strings · CPC title

• G10H2230/065

  Spint piano, i.e. mimicking acoustic musical instruments with piano, cembalo or spinet features, e.g. with piano-like keyboard; Electrophonic aspects of piano-like acoustic keyboard instruments; MIDI-like control therefor · CPC title