JP6848771B2 - Sound output device - Google Patents

Description

The present invention relates to a sound output device.

As a sounding method of an electronic musical instrument, a musical instrument (acoustic musical instrument) is recorded, and the waveform information of the recorded musical instrument is stored in a memory as digital waveform data encoded by PCM coding or the like, and the electronic musical instrument is stored. There is known a method of reading waveform data from a memory and outputting it when it should be sounded with. For example, Patent Document 1 includes speakers arranged at positions corresponding to recording positions of waveform data of a live musical instrument, and each speaker performs sounding based on the waveform data recorded at the corresponding positions of the live musical instrument. An electronic keyboard instrument that reproduces the acoustic characteristics of the performance of is disclosed.

Japanese Unexamined Patent Publication No. 2013-041292

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

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

The sound output device according to an embodiment of the present invention is a first acoustic signal including a first axial component of sound arriving from a sound source at a first sound collection point corresponding to a first sound emission point. Is emitted with directivity in the first axial direction, and a second acoustic signal including a component in the second axial direction of the sound arriving at the first sound collection point from the sound source is transmitted. A third that emits sound with directivity in the second axial direction and includes a component in the third axial direction of the sound arriving from the sound source at the second sound collection point corresponding to the second sound emission point. The acoustic signal is emitted with directivity in the third axial direction, and a fourth acoustic signal including a component in the fourth axial direction of the sound arriving at the second sound collection point from the sound source is emitted. The sound emitting unit is provided, which emits sound with directivity in the fourth axial direction.

The sound output device according to an embodiment of the present invention uses directional microphones arranged in the first to fourth axial directions at each of the first and second sound collection points from the sound source. A sound generation unit that generates an acoustic signal obtained by sampling the components in the first to fourth axial directions contained in the reaching sound may be further provided.

The sound output device according to the embodiment of the present invention virtualizes the components of the sound arriving from the sound source in the first to fourth axial directions at each of the first and second sound collection points. A sound generator that generates an acoustic signal obtained by calculating the above may be further provided.

The sound emitting unit may be provided corresponding to the first and second sound collecting points arranged in the left-right direction of the position of the performer of the sound source.

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

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

The 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 a sound arriving from a sound source at a first sound collection point corresponding to a first sound emission point. Is emitted with directivity in the first axial direction, and a second acoustic signal including a component in the second axial direction of the sound arriving at the first sound collection point from the sound source is transmitted. A third that emits sound with directivity in the second axial direction and includes a component in the third axial direction of the sound arriving from the sound source at the second sound collection point corresponding to the second sound emission point. The acoustic signal is emitted with directivity in the third axial direction, and a fourth acoustic signal including a component in the fourth axial direction of the sound arriving at the second sound collection point from the sound source is emitted. , The sound is emitted with the directivity in the fourth axial direction.

The electronic musical instrument according to the embodiment of the present invention includes the above-mentioned sound output device, the performance operator, and the first acoustic signal, the second acoustic signal, and the first, depending on the operation of the performance operator. The sound generation unit for generating the third acoustic signal and the fourth acoustic signal is included.

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 the acoustic characteristics of a live musical instrument.

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

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

The sound output device according to the 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 a source of sound emitted from the speaker in accordance with the direction 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 operator 109, a setting operator 111, and a sound output device 112. Each of these configurations is connected to each other via 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 executes a control program stored in the storage unit 103, which will be described later, by the CPU to realize various operations of the electronic musical instrument 10. The CPU executes note-on event processing in response to a note-on event operated by the performance operator 109, which will be 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 or 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 in a state of being stored in a computer-readable recording medium such as a magnetic recording medium, an optical recording medium, an optical magnetic recording medium, or a semiconductor memory. In this case, the electronic musical instrument 10 may be provided with a device for reading the recording medium. Further, 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. Further, the communication I / F 105 may be connected to a communication line such as the Internet or LAN to communicate with an external device such as a server. The function of the storage unit 103 may be realized by an external device capable of communicating by 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 on the setting of the electronic musical instrument 10 to the user based on the control by the control unit 101.

The performance operator 109 is an operator 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, a unique pitch (note) is associated with each of the plurality of keys included in the performance operator 109. The user operates the performance operator 109 to input a note-on event (pronunciation instruction). Based on the note-on event, note-on event data (hereinafter referred to as control signal CONT) including note-on data, note number data that specifies the pitch (note) to be pronounced, velocity data according to the key press speed, etc. Will be generated. The control signal CONT may be data expressed in MIDI format.

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

The sound output device 112 outputs an acoustic signal based on the control signal CONT generated by the operation of the performance operator 109. The sound output device 112 includes a sound generating unit 113 and a sound emitting unit 117. The sound output device 112 may include an amplification unit 115.

The sound generation unit 113 processes music data for a predetermined number of sound channels based on the control signal CONT for each sampling cycle, and generates 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 collecting points is separated from each other by a predetermined distance.

The amplification unit 115 includes a plurality of amplifiers corresponding to the speakers included in the sound generation unit 117, which will be 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 117a to 117d, which will be described later) that convert each of the amplified acoustic signals into sound waves and emit the sound. Each speaker included in the sound emitting unit 117 has directivity in the sound emitting direction corresponding to the arrival direction at each of the plurality of sound collecting points. Each speaker emits a sound based on an acoustic signal corresponding to each sound collection point with a corresponding directivity.

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

The control register 201 receives and stores the control signal CONT corresponding to the note-on event generated by the operation of the performance operator 109 from the control unit 101. The control register 201 transmits the stored control signal CONT to the address signal generation unit 202. Further, the control register 201 transmits the control signal CONT to the sound signal adjusting 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 generation unit 202 generates an address signal ADD for reading the desired musical tone data corresponding to the note-on event generated by the operation of the performance operator 109 from the musical tone data memory 205 for each sampling cycle. The address signal ADD indicates the address of the desired musical tone data among the musical tone data stored in the musical 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 sound data memory 205 stores a plurality of musical sound data sets in which musical sound data for at least a plurality of channels are set for one pitch of a 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 the 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 the present embodiment, a case where one musical tone data set is composed of musical tone data for four channels will be described.

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

3A and 3B are schematic views for explaining the recording of sound from a sound source. In FIGS. 3A and 3B, a 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 seen from the performer side. The grand piano 30 has a keyboard 31 composed of a plurality of keys 33. In the grand piano 30, each key 33 of the keyboard 31 is arranged so that the pitch assigned to each key 33 is raised by a semitone from left to right with respect to the performer. In the housing of the grand piano 30, strings (sounding bodies) 35 corresponding to the pitches of the keys are stretched in a direction (vertical direction in FIG. 3A) from the keyboard side of the grand piano 30 to the back. When one key 33 is pressed, a hammer (not shown) corresponding to the pressed key strikes (strikes) the corresponding string 35. A part of the vibration of the string 35 generated by the impact of the hammer directly vibrates the air and becomes a sound. Further, a soundboard (not shown) is provided in the housing of the grand piano 30, and a part of the vibration of the string 35 generated by the impact of the hammer is transmitted to the soundboard and resonates in the soundboard. And magnified, the air is vibrated and a sound is emitted. Further, a part of the sound generated from the strings 35 and the soundboard is reflected by each part of the grand piano 30 and then emitted to the outside of the grand piano 30.

As shown in FIGS. 3A and 3B, the musical sound data stored in the musical sound data memory 205 of the electronic musical instrument 10 according to the present embodiment is sampled at the first sound collecting point C1 and the second sound collecting point C2. Two unidirectional microphones 37a and 37b are arranged at the first sound collection point C1, and two unidirectional microphones 37c and 37d are arranged at the second sound collection point C2. Here, the arrangement of the microphones 37a and 37b at the first sound collection point C1 means that the microphones 37a and 37b are arranged so as to collect the sound arriving at the first sound collection point C1. .. Similarly, arranging the microphones 37c and 37d at the second sound collection point C2 means that the microphones 37c and 37d are arranged so as 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. Further, each of the microphones 37a to 37d is arranged 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 provided in the left-right direction when viewed from the performer who plays the grand piano 30.

As shown in FIG. 3B, the sound Sub 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 of the axial Da in which the microphone 37a is arranged among the sound Sabs. The microphone 37b picks up the component Sb in the axial direction Db in which the microphone 37b is arranged among the sound Subs. That is, the microphones 37a and 37b pick up the components (Sa, Sb) in the orthogonal axial directions (Da, Db) with respect to the sound Sab, respectively. Similarly, for the sound Scd that arrives at the sound collection point C2 from each part of the grand piano such as the string 35, the microphone 37c picks up the component Sc of the axial Dc in which the microphone 37c is arranged, and the microphone 37d picks up the sound Scd. The component Sd in the axial direction Dd in which the microphone 37d of the Scd is arranged is picked up. That is, the microphones 37c and 37d pick up the components (Sc, Sd) in the orthogonal axial directions (Dc, Dd) with respect to the sound Scd, respectively. Each of the microphones 37a to 37d is connected to the recording channel of the multi-track 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 encoded in parallel, and digitally assigned to the recording channel corresponding to each of the microphones 37a to 37d of the multitrack recorder 39. It is audio data and is stored as time-synchronized music sound data. In this embodiment, an example in which components of two orthogonal axes of incoming sounds are collected at two sound collection points (first sound collection point C1 and second sound collection point C2) has been described. However, it is not limited to this. The number of sound collection points is M (M is an integer of 2 or more), and the number of sounds in the axial direction at each sound collection point may be N (N is an integer of 2 or more). Further, the axial directions do not necessarily have to be orthogonal to each other.

In the present embodiment, four channels of musical tone data for each pitch are stored in the musical tone data memory 205 as a set of musical 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, respectively. Four channels of musical sound data that are time-synchronized for one pitch can be obtained. The music sound data of each channel included in the music sound data set is digital audio data of the voltage value of the analog acoustic signal picked up by each of the microphones 37a to 37d in a conventionally known coding format such as a PCM coding format. It is the data converted to.

Returning to the description of the sound generation unit 113 with reference to FIG. The sound signal adjusting unit 203 receives the address signal ADD from the address signal generating unit 202, respectively. Further, the sound signal adjusting unit 203 receives the control signal CONT from the control register 201, respectively. The sound signal adjusting unit 203 uses the received address signal ADD to read from the musical tone data memory 205 one musical tone data set corresponding to a desired musical tone, that is, four channels of musical tone data synchronized in time.

Further, the sound signal adjusting unit 203 adjusts the characteristics of the read four-channel musical sound data based on the control signal CONT. Specifically, the sound signal adjusting unit 203 adjusts the characteristics of each of the read musical sound data of each channel based on the velocity data included in the control signal CONT.

The sound signal adjusting unit 203 simultaneously outputs the four-channel musical sound data whose characteristics have been adjusted to the DAC 207. The DAC 207 includes a DAC corresponding to four channels of musical sound data output from the sound signal adjusting unit 203. The DAC 207 digitally-analogly converts the musical sound data of each corresponding channel, and outputs the converted analog signal, which is an acoustic signal, to the amplification unit 115. That is, in the present embodiment, a total of four channels of acoustic signals are simultaneously output from the sound generation unit 113 to the amplification unit 115.

The amplification unit 115 has an amplifier (not shown) corresponding to a 4-channel acoustic signal output from the sound generation unit 113. The four-channel acoustic signal output from the sound generation unit 113 is amplified by the amplification unit 115 and simultaneously output to the sound generation unit 117.

The sound emitting unit 117 has four speakers 117a to 117d corresponding to the four channels of acoustic signals amplified by the amplification unit 115. As described above, the speakers 117a to 117d have sound emission points (first sound collection point E1, second sound collection point E1, second sound collection point C2) corresponding to a plurality of sound collection points (first sound collection point C1 and second sound collection point C2). Each of the E2) is provided, and has the directivity of sound emission in the axial direction (Da'to Dd') corresponding to the plurality of axial directions (Da to Dd) at each of the plurality of sound collection points. Here, the fact that the speakers 117a to 117d are provided at the sound collection points corresponding to the plurality of sound collection points means that the sound arriving at each sound collection point corresponding to each sound collection point can be reproduced at each sound collection point. It means that it is provided in.

4A and 4B are schematic views for explaining the sound emission from the speaker. In FIGS. 4A and 4B, the electronic piano 40 is shown as the electronic musical instrument 10. FIG. 4A is a top view of the electronic piano 40, and FIG. 4B is a front view of the electronic piano 40 as seen from the performer 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 two speakers 117c and 117d at the second sound emission point E2. Speakers 117a to 117d are axial components of sound coming from the sound source toward the first sound collection point C1 and the second sound collection point C2 corresponding to the first sound collection point E1 and the second sound collection point E2, respectively. Sound signals including are output at the same time.

The first sound emission 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. Corresponding to the directivity of the microphone 37a in the axial direction Da at the first sound collection point C1, the speaker 117a has directivity in the axial direction Da'at the first sound emission point E1. Axial direction Da'corresponds to axial direction Da. Corresponding to the microphone 37a picking up the component Sa of the axial Da at the first sound collection point C1 of the grand piano 30, the speaker 117a has an acoustic signal at the axial 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. Corresponding to the directivity of the microphone 37b in the axial direction Db at the first sound collection point C1, the speaker 117b has directivity in the axial direction Db'at the first sound emission point E1. The axial direction Db'corresponds to the axial direction Db. Corresponding to the microphone 37b picking up the component Sb of the axial direction Db at the first sound collecting point C1 of the grand piano 30, the speaker 117b gives an acoustic signal to the axial direction Db'at the first sound emitting 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, by outputting the acoustic signal Sa'corresponding to the component Sa and the acoustic signal Sb' corresponding to the component Sb, the sound Sab at the first sound collection point C1 is output at the first sound emission point E1. Sound Sub'is generated.

Similarly, a speaker 117c is provided at the second sound emission point E2 corresponding to the microphone 37c at the second sound collection point C2. The speaker 117c has directivity in the axial direction Dc'at the second sound collection 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. Corresponding to the microphone 37c picking up the component Sc of the axial direction Dc at the second sound collecting point C2 of the grand piano 30, the speaker 117c has an acoustic signal at the axial direction Dc'at the second sound emitting 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 emission 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 collection 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. Corresponding to the microphone 37d picking up the component Sd of the axial direction Dd at the second sound collecting point C2 of the grand piano 30, the speaker 117d has an acoustic signal at the axial direction Dd'at the second sound emitting 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, by outputting the acoustic signal Sc'corresponding to the component Sc and the acoustic signal Sd' corresponding to the component Sd, the sound Scd at the second sound collection point C2 is output at the second sound emission point E2. Sound Scd'is generated.

As described above, the sound corresponding to the sound Sub and the sound Scd arriving at the sound collection point C1 and the sound collection point C2 from each part of the grand piano 30 such as the string 35, which is the sound source, is the sound emission point of the electronic piano 40. It is generated and emitted as sound Sub'and sound Scd' from E1 and the sound emission point E2. As a result, the listener can feel 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, at each of the plurality of sound collection points, the musical sound data of a plurality of channels based on the arrival direction of the sound of the live musical instrument is stored in the musical sound data memory 205. To. By generating an acoustic signal based on this musical sound data, it is possible to generate an acoustic signal in consideration of the directivity of the sound of the live musical instrument at each of the plurality of sound collection points. Therefore, when the electronic musical instrument 10 including the sound output device 112 is played, the reproducibility of the sound at the time of playing the live musical instrument can be improved.

Further, in the present embodiment, 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 music sound data corresponding to the acoustic signal, and the direction of arrival of the sound from the sound source. It corresponds to. Thereby, when the electronic musical instrument 10 including the sound output device 112 is played, the reproducibility of the sound at the time of playing the live musical instrument can be further improved.

In general, low frequency vibrations are more easily diffracted than high frequency vibrations, and the directivity of sound can be largely ignored. On the other hand, high-frequency vibration is less likely to be diffracted than low-frequency vibration, and has high straightness. Therefore, high-frequency vibration has higher directivity than low-frequency vibration, and affects the reproducibility of the musical sound of a live musical instrument by an electronic musical instrument. Therefore, when collecting the sound of a live instrument using a microphone to obtain musical sound data, especially for sounds having a pitch higher than a predetermined frequency, the musical sound data in consideration of the direction of arrival of the sound from the sound source at the sound collecting point. It is preferable to obtain the above and store it in the musical sound data memory 205 of the electronic musical instrument 10. Further, particularly for a sound having a pitch higher than a predetermined frequency, a sound emission that directs an acoustic signal based on musical sound data considering the arrival direction of the sound from the sound source at the sound collection point in the sound emission direction corresponding to the arrival direction. It is preferable to output from the unit. By associating the sound emitting direction when emitting a sound having a high directivity above a predetermined frequency with the direction of arrival of the sound from the original live musical instrument, the electronic musical instrument 10 determines the sound having a predetermined frequency or higher. The reproducibility of musical sounds can be further improved. The predetermined frequency may be appropriately set.

(Second Embodiment)
Hereinafter, the sound output device according to the 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 generation unit. .. Therefore, the description of the hardware configuration of the electronic musical instrument including the sound output device according to the present embodiment will be omitted except for the sound generation unit of the sound output device.

FIG. 5 is a block diagram showing a configuration of the sound output device 112a according to the present embodiment. Note that, in FIG. 5, the same reference number as the reference number in FIG. 2 is assigned to the same or similar configuration as the sound output device 112 described with reference to FIG. 2, and duplicate description is omitted. The sound output device 112a 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 music data memory 505, a channel divider 507, a digital-to-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 music 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 instrument 10 according to the first embodiment described above. Since it is substantially the same as the signal generation unit 202, the sound signal adjustment unit 203, and the music data memory 205, detailed description thereof will be omitted. Here, as described in the first embodiment, the musical tone data memory 505 is obtained by sampling the sound of a live instrument at a predetermined sound collection point using a microphone having unidirectionality, and each sound is obtained. It is assumed that a musical tone data set containing musical tone data of 4 channels for pitch is stored.

The sound signal adjusting unit 503 uses the address signal ADD generated based on the control signal CONT to read out a musical tone data set including musical tone data of 4 channels from the musical tone data memory 505. The sound signal adjusting unit 503 adjusts the characteristics of the read four-channel musical sound data based on the control signal CONT. The sound signal adjusting unit 203 outputs the four-channel musical sound data whose characteristics have been adjusted to the channel divider 507. The channel divider 507 separates each of the four channels of musical tone data into a high frequency component having a predetermined frequency or more and a low frequency component having a frequency lower than a predetermined frequency. The high frequency component in the 4-channel musical tone data separated by the channel divider 507 is output to the DAC 509. The low frequency components in the 4-channel musical 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 a high frequency component in the 4-channel musical tone data output from the channel divider 507. The DAC 509 digitally-analogly converts the high-frequency component of the music sound data of each corresponding channel, and outputs an acoustic signal, which is the 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 117a to 117d. The speakers 117a to 117d have directivity in the sound emitting direction corresponding to the arrival direction at each of the plurality of sound collecting points. The speakers 117a to 117d emit sound signals corresponding to the sound components picked up by the microphone at each sound collection point with the corresponding directivity.

The low-frequency components in the 4-channel musical tone data output to the mixer 511 are combined into one low-frequency component by the mixer 511. The synthesized low frequency component is output to DAC513 for digital-to-analog conversion. 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 speaker for low frequency components (not shown) or a soundboard speaker (not shown). As described above, the low frequency vibration is more easily diffracted than the high frequency vibration, and the directivity of the sound can be substantially ignored. Therefore, the speaker for the low frequency component does not have to have directivity, unlike the speakers 117a to 117d that output the acoustic signal corresponding to the high frequency component. As a result, the speakers 117a to 117d can be inexpensively configured without using a high-priced speaker having a wide frequency characteristic from a low frequency component to a high frequency component.

The music data of the digital signal output by the sound signal adjustment unit 503 is first digital-analog converted by the DAC 509 and DAC 513, and the converted analog signal is configured by an analog filter circuit or the like and is high by a channel divider that performs analog signal processing. An acoustic signal composed of a frequency component and an acoustic signal composed of a low frequency component may be separated 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 sound data is separated into a high frequency component having a predetermined frequency or more and a low frequency component having a frequency lower than the predetermined frequency. The acoustic signal corresponding to the separated high frequency component is output from the speaker pointing in the sound emitting direction corresponding to the arrival direction at each of the plurality of sound collecting points. In the present embodiment, only the acoustic signal corresponding to the highly directional high frequency component is output from the speaker pointing in 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 musical sounds by an electronic musical instrument can be further improved.

In the first and second embodiments described above, the musical sound data memories 205 and 505 of the sound generation units 113 and 500 in the sound output devices 112 and 112a respectively unidirectionally direct the sound of the live instrument at a predetermined sound collection point. It stores musical sound data obtained by sampling with a microphone having sex. 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 a musical sound from a sound source. The digital audio data obtained by the virtual calculation may be data showing the waveform of the sound pressure at the observation point in the air.

Further, the sound output device according to each of the above-described embodiments may omit the musical sound data memories 205 and 505 of the sound generating units 113 and 500 and include a musical sound data calculation unit that calculates the musical sound data in real time. .. Such a musical tone data calculation unit calculates musical tone data in real time based on the control signal CONT, taking into consideration the position of the sound emitting point and the directivity of the sound emitting unit (speaker).

In each of the above-described embodiments, microphones 37a to 37d at each sound collection point and speakers 117a to 117d at each sound emission point are provided one by one in the axial direction orthogonal to the left and right with respect to the performer. As a result, based on the lateral vibration of the string, the sound emitted in a direction other than the stretching direction of the string (longitudinal direction of the sounding body) and reaches the sound collecting point is reproduced for the listener, especially the performer. I tried to do it. However, microphones and speakers may be provided in more axial directions surrounding the sound collecting and emitting points to further enhance the reproducibility of sound reaching the sound collecting points from various directions. For example, microphones and speakers may be provided in three orthogonal axes so as to surround the sound collecting point and the sound emitting point. Further, microphones and speakers having sharp directivity may be arranged at an acute angle (acute angle).

Further, in each of the above-described embodiments, one sound collecting point and one sound emitting point are provided for the performer, and the sound emitted from each of the strings 35 arranged in the pitch order of the grand piano 30 is localized. Was made to be felt by listeners, especially 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 the front and depth directions when viewed from the performer, that is, in the direction in which the strings are stretched (longitudinal direction of the sounding body), and the progress of the sound emitted from each part of the grand piano 30. The reproducibility may be further enhanced in a direction other than the left-right direction when viewed from the performer.

Further, in the sound output device according to each of the above-described embodiments, 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 the external sound generation 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 operator 609, a setting operator 611, and a sound output device 612. Each of these configurations is interconnected via a bus 619. Since 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 does not include a sound emitting unit, duplicate 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 of the above-described embodiments. 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 output to the external sound generation unit via the communication I / F 605.

Based on the configuration described as the embodiment of the present invention, those skilled in the art have appropriately added, deleted or changed the design of components, or added, omitted or changed the conditions of the present invention. As long as it has the gist of the above, it is included in the scope of the present invention.

In addition, even if the action and effect are different from the action and effect brought about by the above-described embodiment, those that are clear from the description of the present specification or those that can be easily predicted by those skilled in the art are of course. It is understood that it is brought about by the present invention.

10, 60: Electronic musical instrument, 101: Control unit, 103: Storage unit, 105: Communication I / F, 107: Display unit, 109: Performance operator 109: Setting operator, 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 sound data Memory, 207: DAC, 37a to 37d: Mike, 39: Multitrack recorder, 501: Control register, 502: Address signal generator, 503: Sound signal adjustment unit, 505: Music data memory, 507: Channel divider, 509: DAC, 511: Mixer, 513: DAC, 515: Amplifier, 601: Control unit, 603: Storage unit, 605: Communication I / F, 607: Display unit, 609: Performance operator, 611: Setting operator, 613: Sound generation unit, 615: Amplification unit

Claims (3)

A sound signal generator that acquires a sound data set containing at least four sound data for the same pitch and generates at least four acoustic signals corresponding to the at least four sound data included in the acquired sound data set. ,
A sound emitting unit that emits at least four acoustic signals acquired from the sound signal generating unit, and a sound emitting unit.
With
The sound emitting unit is provided in the first sound emitting area, is provided in a first speaker set including the first speaker and the second speaker, and in a second sound emitting area different from the first sound emitting area, and is provided in a third. Includes a second speaker set, including a speaker and a fourth speaker,
The distance between the first speaker and the second speaker is smaller than the distance between the second speaker and the third speaker.
The first speaker and the second speaker have different directivity directions, the first speaker has a directivity direction away from the second sound emission region, and the second speaker has the second sound emission. It has a directivity in the direction of approaching the area,
The third speaker and the fourth speaker have different directivity directions, the third speaker has a directivity direction in a direction approaching the first sound emission region, and the fourth speaker has the first sound emission region. It has a directivity in the direction away from the area,
A sound output device in which the first speaker, the second speaker, the third speaker, and the fourth speaker each output a corresponding acoustic signal out of the at least four acoustic signals. The sound emission points of the first speaker and the second speaker are the same,
The sound output device according to claim 1, wherein the sound emitting points of the third speaker and the fourth speaker are the same. The directivity direction of the first speaker and the directivity direction of the second speaker are orthogonal to each other.
The sound output device according to claim 1, wherein the directivity direction of the third speaker and the directivity direction of the fourth speaker are orthogonal to each other.

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