JP2019047242A - Sound output device - Google Patents

Abstract

To provide a sound output device capable of attaining sound effect similar to the acoustic properties of a live instrument.SOLUTION: An electronic piano 40 has a keyboard 41 constituted of multiple keys 43. The keyboard 41 is a performance operator of electronic musical instrument. The electronic piano 40 has two speakers 117a, 117b at the first sound emission point E1, and has two speakers 117c, 117d at the second sound emission point E2. The speakers 117a-117d simultaneously output acoustic signals including the axial direction components of sounds arriving from a sound source toward first and second collection points corresponding, respectively, to the first and second sound emission points E1 and E2.SELECTED DRAWING: Figure 4A

Description

  The present invention relates to a sound output device.

  As a tone generation method of an electronic musical instrument, the musical tone of a live musical instrument (acoustic musical instrument) is recorded, and waveform information of the recorded musical tone is stored in a memory as digital waveform data encoded by PCM coding or the like. There is known a method of reading out and outputting waveform data from a memory when sound should be generated. For example, Patent Document 1 includes a speaker disposed at a position corresponding to a recording position of waveform data of a live instrument, and performing sound generation based on waveform data recorded at the position corresponding to each speaker. An electronic keyboard instrument has been disclosed that reproduces the acoustic characteristics of the performance of the player.

JP, 2013-041292, A

  However, in the conventional electronic musical instrument, there is a problem that the reproducibility of the sound of the live instrument is insufficient due to the directivity of the sound output from the speaker. For example, waveform information obtained by recording a musical instrument musical tone with a microphone records the amount of musical tone at the position of the microphone, and the direction of arrival of the sound arriving at the position where the microphone is arranged is not considered. . Therefore, when recording at one place, waveform information based on the amount of superposition of sounds arriving at positions where the microphones are arranged from various directions can be obtained. When the sound is reproduced by the electronic musical instrument based on the waveform information obtained in this manner, the sound is emitted in all directions from the position of the speaker. That is, a sound obtained by superimposing sounds arriving at the microphone position from various directions is emitted in all directions, and the reproducibility of sound becomes insufficient. Therefore, there is a demand for a sound output device such as an electronic musical instrument that can obtain the same acoustic effect as the acoustic characteristic of a live instrument.

  One of the problems of the present invention is to provide a sound output device capable of obtaining an acoustic effect similar to that of a live instrument.

  A sound output apparatus according to an embodiment of the present invention is a first acoustic signal including a component in a first axial direction of sound reaching from a sound source to a first sound collection point corresponding to a first sound emission point. A second acoustic signal including a component in the second axial direction of sound arriving from the sound source at the first sound collection point, A third sound emission is made with directivity in a second axial direction, and includes a third axial component of sound arriving from the sound source at a second sound collection point corresponding to a second sound emission point An acoustic signal is emitted with directivity in the third axial direction, and a fourth acoustic signal including a component in a fourth axial direction of sound arriving from the sound source at the second sound collection point is generated. And a sound emitting unit for emitting sound with directivity in the fourth axial direction.

  A sound output apparatus according to an embodiment of the present invention uses the directional microphones arranged in the first to fourth axial directions at each of the first and second sound collection points to generate the sound source The electronic device may further include a sound generation unit that generates an acoustic signal obtained by sampling the components in the first to fourth axial directions included in the arriving sound.

  A sound output device according to an embodiment of the present invention is configured by virtually estimating the first to fourth axial components of sound arriving from the sound source at each of the first and second sound collection points. The sound generation unit may further include a sound generation unit that generates an acoustic signal obtained by the calculation.

  The sound output unit may be provided corresponding to the first and second sound collection points disposed in the left and right direction of the position of the player of the sound source.

  The sound generation unit may generate the first to fourth acoustic signals based on a sound having a predetermined frequency or more among sounds arriving from the sound source.

  A sound output apparatus according to an embodiment of the present invention generates a first acoustic signal including a component in a first axial direction of sound arriving from a sound source at a first sound collection point, and the first collection is performed. A second acoustic signal including a component in the second axial direction of the sound arriving from the sound source at a sound point is generated, and a third axial direction of sound arriving from the sound source at the second sound collecting point is generated. A third acoustic signal including a component is generated, and a fourth acoustic signal including a component in a fourth axial direction of sound arriving from the sound source at the second sound collection point is generated.

  A sound output method according to an embodiment of the present invention is a first acoustic signal including a component in the first axial direction of sound reaching from a sound source to a first sound collection point corresponding to a first sound emission point. A second acoustic signal including a component in the second axial direction of sound arriving from the sound source at the first sound collection point, A third sound emission is made with directivity in a second axial direction, and includes a third axial component of sound arriving from the sound source at a second sound collection point corresponding to a second sound emission point An acoustic signal is emitted with directivity in the third axial direction, and a fourth acoustic signal including a component in a fourth axial direction of sound arriving from the sound source at the second sound collection point is generated. Sound emission with directivity in the fourth axial direction;

  According to one embodiment of the present invention, there is provided an electronic musical instrument, comprising: the above-mentioned sound signal, the second sound signal, the above-mentioned second sound signal, and the above-mentioned sound output device, a performance operator, and the performance operator. And a sound generation unit that generates the fourth sound signal.

  According to the sound output device according to the embodiment of the present invention, it is possible to provide a sound output device capable of obtaining an acoustic effect similar to that of a live instrument.

It is a block diagram showing the hardware constitutions of the electronic musical instrument in one embodiment of the present invention. It is a block diagram showing the sound output device of the electronic musical instrument in one embodiment of the present invention. It is the schematic for demonstrating the recording of the sound from the sound source in one Embodiment of this invention. It is the schematic for demonstrating the recording of the sound from the sound source in one Embodiment of this invention. It is the schematic for demonstrating the sound emission of the sound from the speaker in one Embodiment of this invention. It is the schematic for demonstrating the sound emission of the sound from the speaker in one Embodiment of this invention. It is a block diagram which shows the structure of the sound output device in another embodiment of this invention. It is a block diagram which shows the hardware constitutions of the electronic musical instrument in another embodiment of this invention.

First Embodiment
Hereinafter, a sound output device according to an embodiment of the present invention will be described in detail with reference to the drawings. The embodiment shown below is an example of the embodiment of the present invention, and the present invention is not limited to these embodiments.

  A sound output device according to a first embodiment of the present invention will be described in detail with reference to the drawings. The sound output device according to the first embodiment of the present invention generates an acoustic signal that is the source of the sound emitted from the speaker in accordance with the orientation of the speaker of the sound output device.

[system]
FIG. 1 is a schematic view showing an example of a hardware configuration of an electronic musical instrument 10 including a sound output device according to the present embodiment. The electronic musical instrument 10 includes a control unit 101, a storage unit 103, a communication I / F 105, a display unit 107, a performance control 109, a setting control 111, and a sound output device 112. Each of these configurations is connected to one another via a bus 119. In the present embodiment, the case where the electronic musical instrument 10 including the sound output device is an electronic piano will be described as an example. However, the electronic musical instrument according to the present invention is not limited to the electronic piano, and any musical instrument capable of electrically controlling the pitch, volume and timbre may be used.

  In the electronic musical instrument 10, the control unit 101 includes an arithmetic processing circuit such as a CPU. The control unit 101 causes a CPU to execute a control program stored in a storage unit 103 described later to realize various operations of the electronic musical instrument 10. The CPU executes note-on event processing in response to a note-on event by the operation of the performance operation element 109 described later, generates a control signal corresponding to the note-on event, and transmits the control signal to the sound generation unit 113.

  The storage unit 103 is a storage device such as a non-volatile memory and a hard disk. The storage unit 103 stores a control program for realizing the operation of the electronic musical instrument 10. The control program may be provided stored in a computer readable recording medium such as a magnetic recording medium, an optical recording medium, a magneto-optical recording medium, or a semiconductor memory. In this case, the electronic musical instrument 10 may be provided with a device for reading a recording medium. Also, the control program may be downloaded via the communication I / F 105 via a network such as the Internet.

  The communication I / F 105 communicates with an external device based on the control of the control unit 101. The communication I / F 105 may be connected to a communication line such as the Internet or a LAN to perform communication with an external device such as a server. The function of the storage unit 103 may be realized by an external device that can communicate with the communication I / F 105.

  The display unit 107 is a display device such as a liquid crystal display or an organic EL display, and displays information related to the setting of the electronic musical instrument 10 to the user based on control by the control unit 101.

  The performance operation element 109 is an operation element for playing the electronic musical instrument 10. For example, when the electronic musical instrument 10 is an electronic piano, the performance operator 109 is a keyboard composed of a plurality of keys, a damper pedal, or the like. A unique pitch (note) is associated with the performance operator 109. When the electronic musical instrument 10 is an electronic piano, unique pitches (notes) are associated with a plurality of keys included in the performance operator 109, respectively. The user operates the performance operation element 109 to input a note-on event (tone generation instruction). Note-on event data (hereinafter referred to as control signal CONT) including note-on data, note number data specifying a pitch to be sounded (note), velocity data according to key depression speed, etc. based on the note-on event It is generated. The control signal CONT may be data represented in MIDI format.

  The setting operator 111 is an operator for setting parameters such as a timbre parameter of the electronic musical instrument 10 and an effector to be applied.

  The sound output device 112 outputs an acoustic signal based on the control signal CONT generated by the operation of the play operation element 109. The sound output device 112 includes a sound generation unit 113 and a sound emission unit 117. The sound output device 112 may include an amplification unit 115.

  The sound generation unit 113 processes musical tone data for a predetermined number of sound generation channels based on the control signal CONT for each sampling period to generate an acoustic signal. The sound generation unit 113 generates an acoustic signal corresponding to the sound at a plurality of sound collection points provided around the sound source. Specifically, the sound generation unit 113 generates an acoustic signal corresponding to the sound from the arrival direction which is the direction in which the sound arrives from the sound source at each of the plurality of sound collection points. The sound generation unit 113 generates a plurality of acoustic signals corresponding to a plurality of sound collection points. Here, each of the plurality of sound collection points is separated from each other by a predetermined distance.

  The amplification unit 115 includes a plurality of amplifiers corresponding to a speaker included in the sound emission unit 117 described later. The amplification unit 115 amplifies the acoustic signal output from the sound generation unit 113.

  The sound emitting unit 117 includes a plurality of speakers (speakers 117 a to 117 d described later) that convert each of the plurality of amplified acoustic signals into sound waves and emit the sound waves. Each of the speakers included in the sound output unit 117 has directivity in the sound output direction corresponding to the arrival direction at each of the plurality of sound collection points. Each speaker emits the sound based on the acoustic signal corresponding to each sound collection point with the corresponding directivity.

  FIG. 2 is a block diagram showing the configuration of the sound output device 112 according to the present embodiment. The sound generation unit 113 includes a control register 201, an address signal generation unit 202, a sound signal adjustment unit 203, a musical tone data memory 205, and a digital-analog converter (DAC) 207.

  The control register 201 receives from the control unit 101 a control signal CONT corresponding to a note-on event generated by the operation of the performance operation element 109 and stores it. The control register 201 transmits the stored control signal CONT to the address signal generator 202. Further, the control register 201 transmits the control signal CONT to the sound signal adjustment unit 203.

  The address signal generation unit 202 generates an address signal ADD for each sampling cycle based on the control signal CONT received from the control register 201. In other words, the address signal generator 202 generates an address signal ADD for reading out from the musical tone data memory 205 desired musical tone data corresponding to the note-on event generated by the operation of the performance operator 109 at every sampling cycle. The address signal ADD indicates the address of desired tone data among the tone data stored in the tone data memory 205 described later. The address signal generation unit 202 transmits the generated address signal ADD to the sound signal adjustment unit 203.

  The musical tone data memory 205 stores a plurality of musical tone data sets each having musical tone data of at least a plurality of channels as one set for one pitch of the live musical instrument corresponding to the electronic musical instrument 10. Here, the musical tone data is digital audio data obtained by recording a musical tone from a sound source and encoding waveform information of the recorded musical tone by PCM coding or the like. Alternatively, the musical tone data may be digital audio data obtained by virtually calculating the musical tone from the sound source. In this embodiment, the case where one musical tone data set includes musical tone data for four channels will be described.

  The tone data will be described below. Here, it is assumed that the musical tone data stored in the musical tone data memory 205 is digital audio data in which the sound from the sound source is recorded and the waveform information of the recorded musical tone is encoded by PCM encoding or the like. For example, when the electronic musical instrument 10 is an electronic piano, an acoustic piano is used when recording a sound.

  FIGS. 3A and 3B are schematic diagrams for explaining the recording of sound from a sound source. In FIG. 3A and FIG. 3B, the grand piano 30 is shown as an acoustic piano. FIG. 3A is a top view of the grand piano 30, and FIG. 3B is a front view of the grand piano 30 as viewed from the player side. The grand piano 30 has a keyboard 31 composed of a plurality of keys 33. In the grand piano 30, the keys 33 of the keyboard 31 are arranged such that the pitches assigned to the keys are increased by semitones from left to right to the player. In the case of the grand piano 30, strings (sounding members) 35 corresponding to the pitches of the respective keys are stretched substantially in the direction (vertical direction in FIG. 3A) from the keyboard side of the grand piano 30 to the back. When one key 33 is depressed, a hammer (not shown) corresponding to the depressed key strikes the corresponding string 35. Part of the vibration of the string 35 produced by the hammer strike directly vibrates the air and becomes a sound. In addition, a soundboard (not shown) is provided in the case of the grand piano 30, and a part of the vibration of the strings 35 generated by the striking of the hammer is transmitted to the soundboard and resonated in the soundboard. And the air is vibrated and the sound is emitted. Furthermore, part of the sound generated from the strings 35 and the soundboard is reflected by each part of the grand piano 30 and then released outside the grand piano 30.

  As shown in FIGS. 3A and 3B, the musical tone data stored in the musical tone data memory 205 of the electronic musical instrument 10 according to this embodiment is sampled at the first sound collection point C1 and the second sound collection point C2. Two unidirectional microphones 37a and 37b are disposed at the first sound collection point C1, and two unidirectional microphones 37c and 37d are disposed at the second sound collection point C2. Here, arranging the microphones 37a and 37b at the first sound collection point C1 means that the microphones 37a and 37b are arranged to collect the sound that arrives at the first sound collection point C1. . Similarly, the arrangement of the microphones 37c and 37d at the second sound collection point C2 means that the microphones 37c and 37d are arranged to collect the sound arriving at the second sound collection point C2. . At the first sound collection point C1, the microphones 37a and 37b are arranged in different axial directions orthogonal to each other, and at the second sound collection point C2, the microphones 37c and 37d are arranged in different axial directions orthogonal to each other. In addition, each of the microphones 37 a to 37 d is disposed at a position different from the stretching direction (longitudinal direction of the sounding body) of the string 35 of the grand piano 30. The first sound collection point C1 and the second sound collection point C2 are respectively provided in the left-right direction as viewed from the player playing the grand piano 30.

  As shown in FIG. 3B, the sound Sab arrives at the sound collection point C1 from each part of the grand piano such as the string 35, which is a sound source. The microphone 37a picks up the component Sa in the axial direction Da in which the microphone 37a of the sound Sab is disposed. The microphone 37 b picks up the component Sb in the axial direction Db in which the microphone 37 b is disposed in the sound Sab. That is, the microphones 37a and 37b respectively pick up the components (Sa and Sb) in the axial direction (Da, Db) orthogonal to the sound Sab. Similarly, with regard to the sound Scd arriving from the parts of the grand piano such as the string 35 to the sound collecting point C2, the microphone 37c picks up the component Sc in the axial direction Dc in which the microphone 37c is arranged among the sound Scd, and the microphone 37d The component Sd in the axial direction Dd in which the microphone 37d of the Scd is disposed is picked up. That is, the microphones 37 c and 37 d respectively pick up components (Sc, Sd) in the axial direction (Dc, Dd) orthogonal to the sound Scd. Each of the microphones 37 a to 37 d is connected to the recording channel of the multitrack recorder 39 one by one. The waveform information of the sounds (Sa to Sd) picked up by each of the four microphones 37a to 37d is simultaneously encoded in parallel, and digitalized on the recording channel corresponding to each of the microphones 37a to 37d of the multitrack recorder 39 It is audio data and stored as musical tone data synchronized in time. In the present embodiment, an example is described in which two orthogonal axes components of the arriving sound are collected at two sound collection points (first sound collection point C1 and second sound collection point C2). However, it is not necessarily limited to this. The number of sound collection points may be M (M is an integer of 2 or more), and the number of sound axis directions at each sound collection point may be N (N is an integer of 2 or more). Also, the axial directions do not necessarily have to be orthogonal.

  In this embodiment, tone data of four channels for each tone pitch is stored in the tone data memory 205 as a set of tone data sets. By recording all the sounds of the grand piano 30 using the four microphones 37a to 37d arranged at the first sound collection point C1 and the second sound collection point C2 as shown in FIGS. 3A and 3B, Tone data of four channels synchronized in time with one pitch can be obtained. The musical tone data of each channel included in the musical tone data set is digital audio data of a voltage value of an analog audio signal picked up using each of the microphones 37a to 37d in a conventionally known coding format such as PCM coding format. Converted to.

  The description returns to the sound generation unit 113 with reference to FIG. The sound signal adjustment unit 203 receives the address signal ADD from the address signal generation unit 202. Further, the sound signal adjustment unit 203 receives the control signal CONT from the control register 201. The sound signal adjustment unit 203 reads one music tone data set corresponding to a desired music tone, that is, music data of four channels synchronized in time, from the music sound data memory 205 using the received address signal ADD.

  Furthermore, the sound signal adjustment unit 203 adjusts the characteristics of the read out tone data of the four channels based on the control signal CONT. Specifically, the sound signal adjustment unit 203 adjusts the characteristics of each of the read tone data of each channel based on velocity data and the like included in the control signal CONT.

  The sound signal adjustment unit 203 simultaneously outputs in parallel the four-channel tone data whose characteristics have been adjusted to the DAC 207. The DAC 207 includes a DAC corresponding to the four-channel tone data output from the sound signal adjustment unit 203. The DAC 207 performs digital-to-analog conversion on tone data of each corresponding channel, and outputs an acoustic signal that is a converted analog signal to the amplification unit 115. That is, in the present embodiment, sound signals of four channels in total are simultaneously output from the sound generation unit 113 to the amplification unit 115.

  The amplification unit 115 includes an amplifier (not shown) corresponding to the four-channel acoustic signal output from the sound generation unit 113. The acoustic signals of four channels output from the sound generation unit 113 are amplified by the amplification unit 115, and are simultaneously output to the sound emission unit 117.

  The sound emitting unit 117 includes four speakers 117 a to 117 d corresponding to the four-channel acoustic signals amplified by the amplifying unit 115. As described above, the speakers 117a to 117d are the sound emitting points (first sound emitting point E1, second sound emitting points) corresponding to the plurality of sound collecting points (first sound collecting point C1, second sound collecting point C2) E2) are respectively provided, and have directivity of sound emission in axial directions (Da ′ to Dd ′) corresponding to a plurality of axial directions (Da to Dd) in each of the plurality of sound collection points. Here, that the speakers 117a to 117d are provided at sound emitting points corresponding to a plurality of sound collecting points means that sounds arriving at each sound collecting point corresponding to each sound emitting point can be reproduced at each sound emitting point It means that it is provided in

  FIG. 4A and FIG. 4B are schematic diagrams for explaining the emission of sound from the speaker. The electronic piano 40 is shown as the electronic musical instrument 10 in FIG. 4A and 4B. FIG. 4A is a top view of the electronic piano 40, and FIG. 4B is a front view of the electronic piano 40 viewed from the player side. The electronic piano 40 has a keyboard 41 composed of a plurality of keys 43. The keyboard 41 corresponds to the performance operator 109 of the electronic musical instrument 10. The electronic piano 40 has two speakers 117a and 117b at the first sound emission point E1, and has two speakers 117c and 117d at the second sound emission point E2. The speakers 117a to 117d are axial components of the sound coming from the sound source toward the first sound collection point C1 and the second sound collection point C2 respectively corresponding to the first sound emission point E1 and the second sound emission point E2. And simultaneously output acoustic signals including.

  The first sound output point E1 is provided at a position corresponding to the first sound collection point C1 in FIGS. 3A and 3B. A speaker 117a is provided at the first sound emission point E1 corresponding to the microphone 37a at the first sound collection point C1. The speaker 117a has directivity in the axial direction Da 'at the first sound emission point E1 corresponding to the directivity of the microphone 37a in the axial direction Da at the first sound collection point C1. The axial direction Da 'corresponds to the axial direction Da. In response to the microphone 37a picking up the component Sa in the axial direction Da at the first sound collection point C1 of the grand piano 30, the speaker 117a generates an acoustic signal in the axial direction Da 'at the first sound emission point E1 of the electronic piano 40. Output Sa '. The acoustic signal Sa 'is an acoustic signal based on the component Sa in the axial direction Da picked up by the microphone 37a at the first sound collection point C1.

  A speaker 117b is provided at the first sound emission point E1 corresponding to the microphone 37b at the first sound collection point C1. The speaker 117b has directivity in the axial direction Db 'at the first sound emission point E1 corresponding to the directivity of the microphone 37b in the axial direction Db at the first sound collection point C1. The axial direction Db 'corresponds to the axial direction Db. In response to the microphone 37b picking up the component Sb in the axial direction Db at the first sound collection point C1 of the grand piano 30, the speaker 117b generates an acoustic signal in the axial direction Db 'at the first sound emission point E1 of the electronic piano 40. Output Sb '. The acoustic signal Sb 'is an acoustic signal based on the component Sb in the axial direction Db picked up by the microphone 37b at the first sound collection point C1. Then, an acoustic signal Sa ′ corresponding to the component Sa and an acoustic signal Sb ′ corresponding to the component Sb are output, whereby the first sound emission point E1 corresponding to the sound Sab at the first sound collection point C1 Sound Sab 'is generated.

  Similarly, a speaker 117c is provided at the second sound emitting point E2 corresponding to the microphone 37c at the second sound collecting point C2. The speaker 117c has directivity in the axial direction Dc 'at the second sound output point E2 corresponding to the directivity of the microphone 37c in the axial direction Dc at the second sound collection point C2. The axial direction Dc 'corresponds to the axial direction Dc. As the microphone 37c picks up the component Sc in the axial direction Dc at the second sound collection point C2 of the grand piano 30, the speaker 117c generates an acoustic signal in the axial direction Dc 'at the second sound emission point E2 of the electronic piano 40. Output Sc '. The acoustic signal Sc 'is an acoustic signal based on the component Sc in the axial direction Dc picked up by the microphone 37c at the second sound collection point C2.

  A speaker 117d is provided at the second sound output point E2 corresponding to the microphone 37d at the second sound collection point C2. The speaker 117d has directivity in the axial direction Dd 'at the second sound output point E2 corresponding to the directivity of the microphone 37d in the axial direction Dd at the second sound collection point C2. The axial direction Dd 'corresponds to the axial direction Dd. As the microphone 37d picks up the component Sd in the axial direction Dd at the second sound collection point C2 of the grand piano 30, the speaker 117d generates an acoustic signal in the axial direction Dd 'at the second sound emission point E2 of the electronic piano 40. Output Sd '. The acoustic signal Sd 'is an acoustic signal based on the component Sd in the axial direction Dd picked up by the microphone 37d at the second sound collection point C2. Then, an acoustic signal Sc ′ corresponding to the component Sc and an acoustic signal Sd ′ corresponding to the component Sd are output, whereby the second sound emission point E2 corresponding to the sound Scd at the second sound collection point C2 Sound Scd 'is generated.

  As described above, the sound corresponding to the sound Sab and the sound Scd arriving from the parts of the grand piano 30 such as the string 35, which are sound sources, to the sound collection point C1 and the sound collection point C2 which are sound sources The sound Sab 'and the sound Scd' are generated and emitted from the point E1 and the point of sound emission E2. As a result, the listener feels the sound image 35 'corresponding to each part of the grand piano such as the string 35.

  In the sound output device 112 according to the embodiment of the present invention described above, the music sound data of the plurality of channels are stored in the music sound data memory 205 at each of the plurality of sound collection points. Ru. By generating an acoustic signal based on the musical tone data, an acoustic signal can be generated in consideration of the directivity of the sound of the live instrument at each of the plurality of sound collection points. Therefore, when playing the electronic musical instrument 10 including such a sound output device 112, it is possible to improve the reproducibility of the sound when playing the live musical instrument.

  Further, in the present embodiment, the direction of arrival of sound from a sound source from which the directivity of the speaker (sound emitting unit) that outputs the acoustic signal included in the sound output device 112 is the source of the musical tone data corresponding to the acoustic signal. It corresponds to Thereby, when playing the electronic musical instrument 10 including such a sound output device 112, it is possible to further improve the reproducibility of the sound when playing the live musical instrument.

  In general, low frequency vibrations are more easily diffracted than high frequency vibrations, and the directivity of the sound can be substantially ignored. On the other hand, high frequency vibrations are less likely to be diffracted as compared with low frequency vibrations, and the straightness is high. Therefore, high frequency vibration is more directional than low frequency vibration, and affects the reproducibility of the musical instrument's musical tone by the electronic musical instrument. Therefore, when collecting musical instrument sounds using a microphone to obtain musical tone data, the musical tone data taking into consideration the direction of arrival of the sound from the sound source at the sound collection point, particularly for the sound with a pitch higher than a predetermined frequency. , And preferably stored in the musical tone data memory 205 of the electronic musical instrument 10. Further, in particular, for a sound having a pitch equal to or higher than a predetermined frequency, an acoustic signal based on musical tone data in consideration of the arrival direction of the sound from the sound source at the sound collection point is directed to the emission direction corresponding to the arrival direction. It is preferable to output from the part. The sound emission direction at the time of emitting a sound having a high directivity or higher at a predetermined frequency or higher corresponds to the arrival direction of the sound from the original live instrument, whereby the sound at a predetermined frequency or higher is obtained by the electronic musical instrument 10 Reproducibility of musical tones can be further improved. The predetermined frequency may be set as appropriate.

Second Embodiment
Hereinafter, a sound output device according to a second embodiment of the present invention will be described. The hardware configuration of the electronic musical instrument including the sound output device according to the present embodiment is substantially the same as the hardware configuration of the electronic musical instrument 10 according to the first embodiment of the present invention described above except for the sound generating unit. . Therefore, the hardware configuration of the electronic musical instrument including the sound output device according to the present embodiment will not be described except for the sound generation unit of the sound output device.

  FIG. 5 is a block diagram showing the configuration of the sound output device 112a according to the present embodiment. In FIG. 5, the same or similar configuration as or to that of the sound output device 112 described with reference to FIG. The sound output device 112 a includes a sound generation unit 500, an amplification unit 115, and a sound emission unit 117. The sound generation unit 500 includes a control register 501, an address signal generation unit 502, a sound signal adjustment unit 503, a musical tone data memory 505, a channel divider 507, a digital-analog converter (DAC) 509, a mixer 511, and a DAC 513.

  The control register 501, the address signal generation unit 502, the sound signal adjustment unit 503, and the musical tone data memory 505 in the sound generation unit 500 are the control register 201 and the address in the sound generation unit 113 of the electronic musical instrument 10 according to the first embodiment described above. Since the signal generation unit 202, the sound signal adjustment unit 203, and the musical tone data memory 205 are substantially the same, detailed description will be omitted. Here, as described in the first embodiment, the tone data memory 505 is obtained by sampling the sound of a live instrument at a predetermined sound collection point using a microphone having a single directivity. It is assumed that a tone data set including tone data of four channels is stored for high.

  The sound signal adjustment unit 503 reads a tone data set including tone data of four channels from the tone data memory 505 using the address signal ADD generated based on the control signal CONT. The sound signal adjustment unit 503 adjusts the characteristics of the read four-channel tone data on the basis of the control signal CONT. The sound signal adjustment unit 203 outputs, to the channel divider 507, tone data of four channels whose characteristics have been adjusted. The channel divider 507 separates each of the four channels of musical tone data into a high frequency component which is equal to or higher than a predetermined frequency and a low frequency component which is lower than the predetermined frequency. The high frequency components in the four-channel tone data separated by the channel divider 507 are output to the DAC 509. The low frequency components of the four-channel tone data separated by the channel divider 507 are output to the mixer 511. The predetermined frequency can be set as appropriate.

  The DAC 509 includes a DAC corresponding to high frequency components in the four-channel tone data output from the channel divider 507. The DAC 509 performs digital-analog conversion on high frequency components of the corresponding tone data of each channel, and outputs an acoustic signal which is a converted analog signal to the amplification unit 115. The amplification unit 115 amplifies the acoustic signal and outputs the amplified acoustic signal to the speakers 117 a to 117 d. The speakers 117a to 117d each have directivity in the sound output direction corresponding to the arrival direction at each of the plurality of sound collection points. The speakers 117a to 117d emit acoustic signals corresponding to the sound components picked up using the microphones at the respective sound collection points with the corresponding directivity.

  The low frequency components in the four-channel tone data output to the mixer 511 are synthesized by the mixer 511 into one low frequency component. The synthesized low frequency component is output to the DAC 513 and is digital-to-analog converted. The acoustic signal corresponding to the low frequency component is output to the amplifier 515 and amplified. The acoustic signal amplified by the amplifier 515 is output from a low frequency component speaker (not shown) or a soundboard speaker (not shown). As described above, low frequency vibrations are more easily diffracted than high frequency vibrations, and the directivity of sound can be substantially ignored. Therefore, the speakers for the low frequency components do not have to have directivity, unlike the speakers 117a to 117d that output the acoustic signals corresponding to the high frequency components. Thus, the speakers 117a to 117d can be configured inexpensively without using a high priced speaker having wide frequency characteristics from low frequency components to high frequency components.

  The tone data of the digital signal output from the sound signal adjustment unit 503 is first converted from digital to analog by the DAC 509 and the DAC 513, and the converted analog signal is formed by an analog filter circuit or the like and processed by an analog signal processing channel divider. It may be separated into an acoustic signal composed of frequency components and an acoustic signal composed of low frequency components, and supplied to the amplification unit 115 and the amplifier 515.

  As described above, in the electronic musical instrument including the sound output device 112a of the present embodiment, the musical tone data is separated into a high frequency component higher than a predetermined frequency and a low frequency component lower than the predetermined frequency. An acoustic signal corresponding to the separated high frequency component is output from a speaker directed in the sound emission direction corresponding to the arrival direction at each of the plurality of sound collection points. In the present embodiment, only the acoustic signal corresponding to the high directivity high frequency component is output from the speaker directed to the sound direction corresponding to the arrival direction at each of the plurality of sound collection points. By including such a sound output device 112a, the reproducibility of the musical tone by the electronic musical instrument can be further improved.

  In the first and second embodiments described above, the musical tone data memories 205 and 505 of the sound generation units 113 and 500 in the sound output devices 112 and 112a respectively direct the sound of the live instrument at a predetermined sound collection point. It stores tone data obtained by sampling using a microphone having a characteristic. However, the musical tone data stored in the musical tone data memories 205 and 50 is not limited to this. For example, it may be digital audio data obtained by virtually calculating musical tones from a sound source. The digital audio data obtained by the virtual calculation may be data indicating the waveform of the sound pressure at the observation point in the air.

  In addition, the sound output device according to each embodiment described above may be provided with a tone data operation unit that calculates the tone data in real time while omitting the tone data memories 205 and 505 of the sound generation units 113 and 500. . Such a tone data calculation unit calculates tone data in real time in consideration of the position of the sound emission point and the directivity of the sound emission unit (speaker) based on the control signal CONT.

  In each of the embodiments described above, the microphones 37a to 37d at the respective sound collection points and the speakers 117a to 117d at the respective sound emission points are provided one by one in the axial direction orthogonal to the player. As a result, based on the lateral vibration of the string, the sound that is emitted in a direction other than the string stretching direction (longitudinal direction of the sounding body) and reaches the sound collection point is reproduced to the listener, particularly the performer. It was made to do. However, microphones and speakers may be provided in more axial directions surrounding the sound collection point and the sound emission point to further improve the reproducibility of the sound reaching the sound collection point from various directions. For example, microphones and speakers may be provided in orthogonal three axis directions so as to surround a sound collection point and a sound emission point. In addition, microphones and speakers having sharp directivity may be arranged more at an inferior angle (sharp angle).

  Further, in each embodiment described above, sound collecting points and sound emitting points are provided to the left and right ones for the performer, and localization of sounds emitted from each of the strings 35 arranged in order of pitch in the grand piano 30 To the listeners, especially the performers. However, more sound collecting points and sound emitting points may be provided in the left-right direction to further improve the reproducibility of localization. In addition, sound collection points and sound emission points are provided in front of or in the depth direction as viewed from the player, that is, in the string stretching direction (longitudinal direction of the sounding body), and the progress of the sound emitted from each part of the grand piano 30 Reproducibility may be further enhanced in directions other than left and right as viewed from the player.

  Further, in the sound output device according to each embodiment described above, the sound emitting unit may be omitted. In this case, the sound output device according to each embodiment outputs the acoustic signal output from the sound generation unit to an external sound emission unit (speaker). FIG. 6 is a block diagram showing an electronic musical instrument 60 including a sound output device according to another embodiment of the present invention. The electronic musical instrument 60 includes a control unit 601, a storage unit 603, a communication I / F 605, a display unit 607, a performance control 609, a setting control 611, and a sound output device 612. Each of these configurations is connected to one another via a bus 619. The configuration of the electronic musical instrument 60 is substantially the same as that of the electronic musical instrument 10 of the first embodiment except that the sound output device 612 is not provided with a sound emitting unit, and thus the redundant description will be omitted. The sound output device 612 according to the present embodiment includes a sound generation unit 613. The sound generation unit 613 has the same configuration as the sound generation unit 113 or the sound generation unit 500 in the sound output device according to each embodiment described above. The sound output device 612 may include an amplification unit 615. In the electronic musical instrument 60, the acoustic signal output from the sound generation unit 613 is amplified by the amplification unit 615, and is output to an external sound emission unit via the communication I / F 605.

  Those skilled in the art appropriately add, delete, or change design of components based on the configuration described as the embodiment of the present invention, or add, omit, or change conditions of processes are also the present invention. It is included in the scope of the present invention as long as it has the gist of

  In addition, even if other effects or effects different from the effects brought about by the aspects of the embodiment described above are apparent from the description of the present specification, or those which can be easily predicted by those skilled in the art, it is natural. It is understood that the present invention provides the

10, 60: electronic musical instrument, 101: control unit, 103: storage unit, 105: communication I / F, 107: display unit, 109: performance operation unit 109: setting operation unit, 112, 112a, 612: sound output device, 113: sound generation unit, 115: amplification unit, 117: sound emission unit, 117a to 117d: speaker, 119: bus, 201: control register, 202: address signal generation unit, 203: sound signal adjustment unit, 205: musical tone data Memory, 207: DAC, 37a to 37d: microphone, 39: multitrack recorder, 501: control register, 502: address signal generator, 503: sound signal adjuster, 505: tone data memory, 507: channel divider, 509: DAC, 511: mixer, 513: DAC, 515: amplifier, 601: control unit, 603: storage unit, 605: communication I / , 607: display unit, 609: performance operators, 611: setting operators, 613: sound generation unit, 615: amplification unit

Claims (8)

A first acoustic signal including a component in a first axial direction of a sound reaching from a sound source to a first sound collection point corresponding to a first sound emission point, with directivity in the first axial direction Sound and
A second acoustic signal including a component in the second axial direction of the sound arriving from the sound source at the first sound collection point is emitted with directivity in the second axial direction;
The directivity of the third acoustic signal including the component in the third axial direction of the sound arriving from the sound source to the second sound collection point corresponding to the second sound emission point, directivity in the third axial direction It emits noise with
A fourth acoustic signal including a component in the fourth axial direction of sound arriving from the sound source at the second sound collection point is emitted with directivity in the fourth axial direction.
Sound output device equipped with a sound emission unit. In each of the first and second sound collection points, the first to fourth included in the sound arriving from the sound source using the directional microphones arranged in the first to fourth axial directions The sound output device according to claim 1, further comprising a sound generation unit that generates an audio signal obtained by sampling an axial component. A sound that generates an acoustic signal obtained by virtually calculating the first to fourth axial components of the sound arriving from the sound source at each of the first and second sound collection points The sound output device according to claim 1, further comprising a generation unit.   The said sound emitting part is provided corresponding to the said, 1st and 2nd sound collection point arrange | positioned in the left-right direction of the position of the player of the said sound source. Sound output device.   The sound output device according to claim 2, wherein the sound generation unit generates the first to fourth sound signals based on a sound having a predetermined frequency or more among sounds arriving from the sound source. Generating a first acoustic signal including a first axial component of the sound arriving from the sound source at the first sound collection point;
Generating a second acoustic signal including a component in the second axial direction of the sound arriving from the sound source at the first sound collection point;
Generating a third acoustic signal including a component in the third axial direction of the sound arriving from the sound source at a second sound collection point,
Generating a fourth acoustic signal including a fourth axial component of the sound arriving from the sound source at the second sound collection point;
Sound output device provided with a sound generation unit. A first acoustic signal including a component in a first axial direction of a sound reaching from a sound source to a first sound collection point corresponding to a first sound emission point, with directivity in the first axial direction Sound and
A second acoustic signal including a component in the second axial direction of the sound arriving from the sound source at the first sound collection point is emitted with directivity in the second axial direction;
The directivity of the third acoustic signal including the component in the third axial direction of the sound arriving from the sound source to the second sound collection point corresponding to the second sound emission point, directivity in the third axial direction It emits noise with
Emitting a fourth acoustic signal including a component in the fourth axial direction of the sound arriving from the sound source at the second sound collection point with directivity in the fourth axial direction , Sound output method. A sound output device according to claim 1;
With the play controller,
A sound generation unit that generates the first sound signal, the second sound signal, the third sound signal, and the fourth sound signal according to an operation on the performance operation element;
Electronic musical instruments.

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