JPH07334182A - Sound reverberation adding device - Google Patents

Abstract

PURPOSE:To adds a sound reverberation which give superior sound effects by using technology of crosstalk cancellation. CONSTITUTION:The sound reverberation adding device adds the sound reverberation to musical sound signals of two channels for sounding by two sounding sources positions in front of a listener at the same distance and has an initial reflected sound generating means 1 which generates initial reflected sound signals of two channels by delaying and attenuating an input musical sound signal from outside, a crosstalk canceling means 2 which generates a signal for cancellation by delaying and inverting the phase of the initial reflected sound signals of two channels generated by the initial reflected sound generating means 1 and then adds the signal to the initial reflected sound signal of the other channel to generate an initial reflected sound signal with cancellation for localizing a sound image of the initial reflected sound outside the two sounding sources, and sound reverberation adding means AD2 and AD3 which adds the input musical sound signal and the initial reflected sound signal with cancellation generated by the crosstalk canceling means 2 to generate output musical sound signals of two channels.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverberation adding device for imparting a reverberation effect to a tone signal.

[0002]

2. Description of the Related Art FIG. 9 shows a path of a sound reaching a listener when a musical instrument is played in a hall 54. It is assumed that a musical sound is emitted from the sound source 50 when performing vocal music or musical instrument performance. The listener 51 can hear the direct sound 52 of the musical sound emitted from the sound source 50 and the initial reflected sounds 53L and 53R.

The direct sound 52 is directly heard from the sound source 50 by the listener 5.
It is the sound that reaches the ear 1. The initial reflected sound 53 is a sound that reaches the ear of the listener 51 after being reflected from the sound source 50 to the side wall or ceiling in the hall 54. In addition, there is a rear reverberation sound that reaches the listener 51 after being reflected from the sound source 50 to the rear wall and then to the wall or ceiling.

When playing a musical instrument or the like in a hall with excellent acoustic effects, the listener 51 can feel the spread of the sound. It is said that the condition of a good hall is that the initial reflected sound 53 is sufficiently obtained from the side of the listener 51 when the musical sound is emitted from the sound source 50. In order to obtain the initial reflected sound from the side, the structure of the wall in the hole 54 may be devised.

When the left and right speakers are used as the sound source, the sound volume generated by the left and right speakers is adjusted so that the sound image is localized at an arbitrary intermediate position between the left and right speakers. Figure 10
Shows a virtual sound source using two speakers. Listener 6
Left and right two-channel speakers 61L and 61R in front of 2
Is located. The speaker 61L is on the left front side of the listener 62, and the speaker 61R is on the right front side of the listener 62.

The listener 62 recognizes that the virtual sound source is in any one of the areas 64 by the musical sound emitted from each of the speaker 61L and the speaker 61R. Speaker 6
When the musical sound is emitted from only 1L, the listener 62 recognizes that the sound source is at the position of the speaker 61L, and the speaker 61R
When a musical sound is emitted only from the listener, the listener 62 recognizes that the sound source is located at the speaker 61R. When the musical sound is emitted from both the speaker 61L and the speaker 61R, the listener 62 recognizes that there is a sound source between the speaker 61L and the speaker 61R.

A pseudo sound source whose position changes in this way is called a virtual sound source. Virtual sound sources are speakers 61L and 61R
You can make it look like there is a sound source in a place without. The position of the virtual sound source is the speaker 61L and the speaker 61.
The position of the speaker 61L is the leftmost, and the position of the speaker 61R is the rightmost, which is determined by the volume balance of the musical sounds emitted from the respective Rs.

In a space without reflecting walls or the like, or in a room where acoustic effects are not added, it is not possible to expect the reverberation of musical sounds emitted from the speakers 61L and 61R. Therefore, in order to simulate a realistic hall, the listener 62
Virtual sound source 63L and virtual sound source 6 located diagonally forward of
3R is required. The initial reflected sound is the virtual sound source 63L or the virtual sound source 63 located slightly before the side of the listener 62.
The ideal is to hear from R. However, the virtual sound sources 63L and 63R cannot be generated basically because they are outside the area 64.

Therefore, such virtual sound sources 63L, 63R
A technique of three-dimensional sound image localization is known to generate a. In order to perform three-dimensional sound image localization, first, a dummy head is prepared at the position of the listener 62, and an impulse signal is emitted at the position of the virtual sound source 63L or the virtual sound source 63R. The impulse response at the position of the dummy head is measured, and its response characteristic is matched with the coefficient of the FIR filter.

When the musical tone signal is input to the FIR filter whose coefficient has been determined, the listener can recognize that the musical tone is heard from the position of the virtual sound source 63L or the virtual sound source 63R.

[0011]

At least two FIR filters are required to perform three-dimensional sound image localization. Also,
The coefficient of the FIR filter generated after measuring the impulse response has a large number of coefficients due to the large order of the filter, which requires a large-capacity storage element and also makes the circuit configuration of the FIR filter very complicated and expensive. It becomes a circuit.

FIG. 11 shows a virtual sound source generated by crosstalk cancellation. Crosstalk cancellation is one method for realizing a virtual sound source. Normal,
The musical sound emitted from one sound source (for example, the speaker 71R) reaches the left and right ears of the listener 72. Originally, even if the music sound emitted from the right speaker 71R is desired to be heard only by the right ear of the listener 72, the music sound is usually "leaked" to the left ear. The purpose of crosstalk cancellation is to eliminate this “leakage”.

Of the musical sounds emitted from the speaker 71R, the musical sound SR1 reaches the right ear of the listener 72 in a predetermined time,
The musical sound SR2 reaches the left ear of the listener 72 after a certain delay time. When it is desired that only the right ear hears the musical sound emitted from the right speaker 71R, only the musical sound SR1 is valid and the musical sound SR2 is erased.

It is assumed that the distance that the musical sound SR2 reaches the left ear of the listener 72 is ΔL longer than the distance that the musical sound SR1 reaches the right ear of the listener 72. In other words, the musical sound SR2 is
It can be considered that the tone SR1 is a signal delayed by a distance of ΔL.

A musical sound S reaching the left ear from the right speaker 71R
In order to erase R2, a canceling musical sound CSR2 is generated from the left speaker 71L. Canceling sound CSR2
Is a signal having a phase opposite to that of the tone signal SR2 at the position of the left ear. Therefore, the musical sound SR2 is canceled by the canceling musical sound CSR2. As a result, the musical sound SR
Only one is heard in the right ear of the listener 72 and nothing is heard in the left ear. Hearing a musical sound only in the right ear is equivalent to hearing the musical sound from the virtual sound source 73 right next to the listener 72.

In order to cancel the crosstalk, it is necessary to install the left speaker 71L and the right speaker 71R at locations equidistant from the listener 72. Canceling sound CS
Since R2 is generated assuming that the listener 72 is in the middle of the left speaker 71L and the right speaker 71R in advance, crosstalk cancellation is complete only when the listener 72 and the speakers 71L and 71R have a predetermined positional relationship. To be done. Details of the configuration of the crosstalk cancel circuit are disclosed in Japanese Patent Laid-Open No. 4-318896.

It is an object of the present invention to provide a reverberation sound adding device for adding a reverberation sound giving an excellent acoustic effect to a musical tone signal by using a crosstalk canceling technique.

[0018]

DISCLOSURE OF THE INVENTION A reverberation adding device of the present invention adds a reverberation to a two-channel tone signal to be emitted from two sound sources located at the same distance in front of a listener. The device is an apparatus for delaying and attenuating an input musical tone signal supplied from the outside to generate a 2-channel initial reflected sound signal, and a 2-channel initial reflection sound generated by the initial reflected sound generating means. Cancellation is performed to delay and phase-invert each sound signal and generate a canceling signal, and then add it to the initial reflected sound signal of the other channel to localize the initial reflected sound outside the two sound sources. A crosstalk canceling means for generating an additional initial reflected sound signal, and a cancel additional initial reflection signal generated by the input musical sound signal and the crosstalk canceling means. By adding the sound signals, and a reverberation adding means for generating an output tone signals of two channels.

[0019]

When the output musical sound signal generated by adding the cancel-added initial reflected sound signal to the input musical sound signal is sounded from the two-channel sound sources, the initial reflected sound is localized outside the two sound sources. be able to. As a result, the listener feels as if he or she hears the early reflection sound from the side or diagonally forward.

[0020]

FIG. 2 is a block diagram showing the overall construction of an electronic musical instrument constructed using the reverberation sound adding device according to the embodiment of the present invention.

The keyboard 11 has a plurality of keys for performing a performance, and when the performer performs a key press, a key release, etc., a key operation such as a key on / off signal and pitch information (key code) is performed. Generate signals of information. The control unit 14 generates musical tone parameters necessary for generating musical tones according to the key operation information detected from the keyboard 11.

The tone generating section 15 generates a tone signal necessary for sound generation based on the tone parameters supplied from the control section 14. The generated tone signal is used as the reverberation sound adding device 1
6 and the reverberation sound is added. Reverberation sound addition device 1
6, the left and right two-channel tone signals generated by adding the reverberation sound are sound systems 17R and 17L.
Is pronounced in each. Sound system 17
R and 17L include a speaker that is a sound source.

The ROM 13 stores a calculation program. The control unit 14 performs various arithmetic processes such as generation of musical tone parameters using a working memory such as a register and a buffer memory provided in the RAM 12 according to an arithmetic program stored in the ROM 13.

The tone generating section 15 supplies the reverberation tone adding device 16 with a tone signal corresponding to a direct tone of a tone. The reverberation sound adding device 16 generates an initial reflected sound signal and a rear reverberation sound signal from the supplied direct sound signal. Then, crosstalk cancellation is performed only on the initial reflected sound signal, and the virtual sound source is positioned diagonally in front of the listener. Reverberation sound addition device 1
The circuit configuration of 6 will be described in detail later.

The position of the virtual sound source generated in the reverberation sound adding device 16 is determined by the circuit coefficient in the reverberation sound adding device 16. The control unit 14 can control the circuit coefficient in the reverberation sound adding device 16 to arbitrarily move the position of the virtual sound source.

FIG. 3 shows an echo pattern when a musical sound is emitted in the hall as shown in FIG. In the echo pattern, the horizontal axis represents time and the vertical axis represents sound level. The direct sound 21, the initial reflected sound 22, and the rear reverberation sound 23 of the musical sound emitted from the sound source reach the listener's ears.

Since the direct sound 21 reaches the listener's ear directly from the sound source, the direct sound 21 has the shortest reach and the highest level from the sound source to the listener as compared with the early reflection sound 22 and the rear reverberation sound 23.

The initial reflected sound 22 reaches the listener's ears after the musical sound emitted from the sound source is reflected on the side wall in the hall, etc., so that the listener's ears are slightly behind the direct sound 21. And the sound level becomes slightly attenuated compared to the direct sound 21. The initial reflected sound 22 is composed of a plurality of sounds having different arrival times. Since there are a plurality of objects such as walls, ceilings, or floors that reflect sound in the hall, early reflected sounds from various places can be obtained. The arrival time and the level of the reflected sound are different when the reflected place or the number of times is different.

Since the rear reverberation sound 23 reaches the listener's ear after the musical sound emitted from the sound source is reflected on the rear wall in the hall and is reflected a plurality of times, compared to the initial reflection sound 22. The arrival time is further delayed and the level becomes smaller. The rear reverberation sound 23 is a sound that is reflected a plurality of times on a rear wall or a side wall, a ceiling, a floor, or the like, and various reflected sounds are mixed to such an extent that it cannot be separated into smaller pieces. A variety of these mixed reflected sounds are collectively referred to as a rear reverberation sound 23.

The direct sound 21, the early reflection sound 22, and the rear reverberation sound 23 described above are generated in the reverberation sound adding device 16 shown in FIG. Next, the reverberation sound adding device 16 will be described.

FIG. 1 is a block diagram showing a circuit configuration of the reverberation sound adding device 16. To the reverberation sound adding device, the left channel tone signal Lin and the right channel tone signal Rin generated by the tone generating unit 15 shown in FIG. 2 are input.

The left-channel tone signal Lin and the right-channel tone signal Rin are multiplied by predetermined coefficients in the multipliers M1 and M2, respectively, and then added in the adder AD1 to synthesize the left and right channels. The synthesized musical tone signal W0 can be considered as a direct sound that reaches the listener from the sound source.

The initial reflected sound generation section 1 receives the musical tone signal W0 of the direct sound and receives the musical tone signals WL1 to WL3 of the initial reflected sound.
WR1 to WR3 are generated. Initial reflected sound signals WL1 to W
L3 is an initial reflected sound signal of three left channels. The initial reflected sound signals WL1 to WL3 are the initial reflected sound 22 of FIG.
The three signals have different arrival times to the listener and different sound volume levels, as shown in the echo pattern. The initial reflected sound signals WR1 to WR3 are right channel reflected sound signals having different arrival times and different sound volume levels. Details of the initial reflected sound generation unit 1 will be described later with reference to FIG.

The crosstalk cancel circuit 2 includes the initial reflected sound signals WL1 to WL generated by the initial reflected sound generator 1.
3, the crosstalk cancellation process is performed on WR1 to WR3, and the position of the virtual sound source of the initial reflected sound is set diagonally forward of the listener. The crosstalk cancellation circuit 2
The left and right two-channel initial reflected sound signals WL5 and WR5 to which the cancellation signal is added are output. Details of the crosstalk cancel circuit 2 will be described later with reference to FIG. 7.

The rear reverberant sound generator 3 receives the direct sound delay signal W.
Enter W0. The direct sound delay signal WW0 is a signal delayed by the initial reflected sound generation unit 1, and is a signal delayed by a predetermined time from the direct sound signal W0. The rear reverberation sound generation unit 3 generates a rear reverberation sound that appears after a predetermined time from the direct sound (W0). Based on the direct sound delay signal WW0 delayed by a predetermined time from the direct sound signal W0, the rear reverberation sound generation unit 3 generates further delayed two-channel left and right rear reverberation sound signals WWL1 and WWR1. Details of the rear reverberation sound generation unit 3 will be described later with reference to FIG. 8.

The adder AD2 adds the left channel direct sound signal, the initial reflected sound signal and the rear reverberation sound signal to generate a left channel output musical sound signal Lout. Adder AD
3 is a right channel output musical tone signal R obtained by adding the right channel direct sound signal, the initial reflected sound signal and the rear reverberation sound signal.
generate out.

The direct sound signal input to the adder AD2 (AD3) is a multiplier M3 with respect to the direct sound signal Lin (Rin) generated in the musical sound generating section 15 shown in FIG.
It is the signal multiplied by the coefficient in (M8).

The initial reflected sound signal input to the adder AD2 (AD3) is the initial reflected sound signal WL5 in which the position of the virtual sound source is set in the crosstalk cancel circuit 2.
It is a signal obtained by multiplying (WR5) by a coefficient by a multiplier M4 (M6).

The rear reverberation sound signal input to the adder AD2 (AD3) is multiplied by the coefficient in the multiplier M5 (M7) with respect to the rear reverberation sound signal WWL1 (WWR1) generated in the rear reverberation sound generator 3. It is a signal that has been processed.

The reverberation sound adding device 16 outputs left and right channel tone signals Lout and Rout including a direct sound, an initial reflection sound and a rear reverberation sound. Music signal Lout,
Rout is then pronounced in the sound system. The virtual sound source of the initial reflected sound in the musical sound signals Lout and Rout is set at a position diagonally ahead of the listener.

FIG. 6 shows the initial reflected sound generating section 1 shown in FIG.
3 is a block diagram showing the circuit configuration of FIG. The initial reflected sound generation unit 1 receives the direct sound signal W0 and receives the initial reflected sound signal WL1.
~ WL3, WR1 to WR3 are generated. The initial reflected sound signals WL1 to WL3 are left channel initial reflected sound signals, and the initial reflected sound signals WR1 to WR3 are right channel initial reflected sound signals.

Further, the initial reflected sound generating section 1 delays the direct sound signal W0 by a predetermined time and outputs the direct sound delay signal WW.
Generates 0. The direct sound delay signal WW0 is a base signal for generating a rear reverberation sound, and is supplied to the rear reverberation sound generation unit.

The direct sound signal W0 is input to the delay line 31 in the initial reflected sound generator 1. The delay line 31 delays according to the distance from the input terminal to which the direct sound signal W0 is input to each output terminal. Each output terminal outputs a delay signal having a longer delay time as it is farther from the input terminal. The delay line 31 receives the signals WR1, WL1, and
A delay signal having a long delay time is generated in the order of WR2, WL2, WR3, WL3, and WW0.

Initial reflected sound signals WL1 and W of the left channel
L2 and WL3 are signals in which the direct sound signal W0 is delayed by the delay line 31 and then multiplied by the coefficients in the multipliers M12, M14, and M16, respectively. The initial reflected sound signals WR1, WR2, WR3 of the right channel are delayed by the direct sound signal W0 by the delay line 31, and then are respectively multiplied by multipliers M11, M13,
It is the signal multiplied by the coefficient in M15.

FIG. 7 is a block diagram showing a circuit configuration of the crosstalk cancel circuit 2 shown in FIG. The crosstalk cancel circuit 2 includes the initial reflected sound signals WL1 to WL3 and WR1 to W generated by the initial reflected sound generation unit of FIG.
Upon receiving R3, the initial reflected sound signals WL5 and WR5 in which the position of the virtual sound source is set are output.

Initial reflected sound signals WL1 to W of the left channel
L3 is multiplied by coefficients in multipliers M21, M22, and M23, respectively, and then added in adder AD13. A low-frequency component of the added signal is cut by a high-pass filter (HPF) 32. The low frequency component is unnecessary because it has almost no effect on the sound image localization.

The signal from which the low frequency component has been cut is delayed by the delay circuit 33. The delay time when the delay is performed is shown in FIG.
1 corresponds to the time of the distance difference ΔL between the signal SR1 reaching the right ear and the signal SR2 reaching the left ear of the listener 72.

The phase of the delayed signal is inverted in the inverting circuit 34, and the signal CWL having the opposite phase is generated. The adder AD12 adds the opposite phase signal CWL of the left channel and the original right channel signals WR1 to WR3 to generate a right channel signal WR5. Right channel signal WR1
˜WR3 are signals to be given to the right ear of the listener as they are from the right speaker. The anti-phase signal CWL is a canceling signal for canceling the sound of the left channel signals WL1 to WL3 reaching the right ear of the listener.

Similarly, the right channel signals WR1 to WR3 input to the crosstalk cancel circuit 2 are multiplied by coefficients in multipliers M26, M25 and M24, respectively, and then,
The HPF 35 and the delay circuit 36 are added by the adder AD14.
And the cancellation signal CWR via the inverting circuit 37.
Is generated. The adder AD11 has a canceling signal C
WR and the original left channel signals WL1 to WL3 are added to generate a left channel signal WL5.

The signals WL1 to WL3 are signals to be given from the left speaker to the listener's left ear as they are. The cancellation signal CWR is a signal for canceling the sound of the right channel signals WR1 to WR3 reaching the left ear of the listener.

The signals WL5 and WR5 output from the crosstalk cancel circuit 2 are signals in which a canceling signal is added to the initial reflected sound signal. If the crosstalk cancellation is completely performed, the signals WL1 to WL3 included in the left signal WL5 are heard only in the left ear of the listener, and the signals WR1 to WR3 included in the right signal WR5 are in the right ear of the listener. Will only be heard. That is, the listener feels that the initial reflected sound can be heard right beside or right beside.

However, in the reverberation adding device of this embodiment,
By making the early reflection sound audible from the front of the listener, a realistic sound effect is generated. Multiplier M24
The position of the virtual sound source of the initial reflected sound is changed by controlling the coefficient of M26. The coefficients of the multipliers M21 to M26 determine the crosstalk cancellation amount. When the coefficient is 1, the cancellation amount becomes maximum, and the virtual sound source is almost beside the listener. By setting the coefficient of the multiplier to, for example, 0.6, the virtual sound source can be set at an appropriate position diagonally ahead of the listener.

Since the crosstalk cancel circuit of this embodiment is a simple circuit for realizing the crosstalk cancel, the crosstalk cancel is not completely performed even if the coefficient of the multiplier is 1, and the crosstalk cancel circuit is slightly inclined. A virtual sound source is set ahead.

Further, the crosstalk cancellation is not completely performed due to the difference in the positions of the left and right ears of the individual listener and the relative position shift between the listener and the speaker. Therefore, even if the coefficient of the multiplier is set to 1, in most cases, the early reflection sound can be localized obliquely ahead of the listener.

Since the coefficients of the multipliers M21 to M26 can be set independently, each of the initial reflected sounds WL is
It is possible to generate natural reverberant sounds by varying the canceling amounts for 1 to WL3 and WR1 to WR3 and changing the places of sound image localization.

FIG. 4 shows the position of the virtual sound source when the amount of crosstalk cancellation is large. FIG. 5 shows the position of the virtual sound source when the crosstalk cancellation amount is small. The musical sounds emitted from the left and right two-channel speakers 26L and 26R reach the listener's 27 ears. The direct sound and the rear reverberation sound can be heard from the area 25.

When the cancellation amount is large, the listener 2
Early reflected sounds can be heard from areas 28L and 28R which are located just beside 7. On the other hand, when the amount of cancellation is small, the area 29 in front of the areas 28L and 28R viewed from the listener is shown.
Early reflections can be heard from L and 29R. The position of the virtual sound source from which the initial reflected sound is heard can be changed by changing the coefficient of the multiplier to obtain the area 28L, 28R or the area 29.
It can be moved like L and 29R.

FIG. 8 shows the rear reverberation sound generating section 3 shown in FIG.
3 is a block diagram showing the circuit configuration of FIG. The rear reverberation sound generation unit 3 receives the delayed signal WW0 of the direct sound and generates the rear reverberation sound signals WWL1 and WWR1 of the left and right channels.

The direct sound delay signal WW0 is input to the m parallel blocks B1 to Bm. Blocks B1 to Bm are
Different reverberations are generated based on the signal WW0. The block B1 receives the signal WW0 and generates reverberation sound signals b1L and b1R for the left and right channels.
2 receives the signal WW0 and generates reverberation sound signals b2L and b2R.

The signal WW0 input to the block B1 is
After being multiplied by the coefficient in the multiplier MM11, it is added to the feedback signal output from the multiplier MM14 in the adder AA1. The output signal of the adder AA1 is the delay line D1.
After being delayed at, the reverberation sound signal b1L of the left channel is generated via the multiplier MM12. Then, in the delay line D1, the signal further delayed than the reverberation sound signal b1L becomes the reverberation sound signal b1R of the right channel via the multiplier MM13. In the delay line D1, a signal that is further delayed than the reverberation sounds b1L and b1R is fed back to the adder AD1 via the multiplier MM14 after the high frequency component is cut by the low pass filter LPF1.
The adder AA1 receives the feedback signal, and simulates and outputs the reverberation sound that is generated by being reflected by the wall in the hall.

Similarly, in each of the blocks B2 to Bm, the reverberation sound signals b2L to b of the left and right channels are generated.
mL, b2R to bmR are produced. The reverberation sound signals b1L to bmL and b1R to bmR generated have different delay times and different sound volume levels like the rear reverberation sound 23 in FIG.

Left channel reverberation sound signal b1L to bmL
Is added by the adder AD21 and then input to the all-pass filter (APF) 41L. Since the APF 41L includes a feedback circuit using a delay line, it is possible to generate a finer reverberation sound. After the reverberation sound is made fine in the APF 41L, a finer reverberation sound is generated in the APF 42L and converted into the reverberation sound signal WWL1.

Similarly, the reverberation sound signal b1R of the right channel
~ BmR are added by the adder AD22 and then added to APF4
It is converted into a reverberation sound signal WWR1 via 1R and APF42R.

The left and right two-channel reverberation sound signals WWL1 and WWR1 generated by the rear reverberation sound generation unit 3 are thereafter added to the initial reflection sound signal to which the direct sound signal and the canceling signal are added.

When the musical sound signal to which the direct sound, the early reflection sound and the rear reverberation sound are added is sounded from the left and right two-channel speakers, the sound image is localized between the two speakers for the direct sound and the rear reverberation sound. On the other hand, since the initial reflected sound is subjected to predetermined crosstalk cancellation, the sound image can be localized in an area outside both speakers.

The listener hears the direct sound and the rear reverberant sound from the vicinity of the front speaker position.
You can hear from diagonally forward (around the side). The listener hears the initial reflected sound diagonally from the front,
You can experience the presence as if you are listening to music in a hall with excellent acoustic effects.

Further, by performing the sound image localization of the initial reflected sound by using the crosstalk cancel circuit, the reverberation sound adding device can be realized with a simple circuit configuration without using the FIR filter like the three-dimensional sound image localization. be able to.

The rear reverberant sound generated by the rear reverberant sound generator 3 in FIG. 1 is also crosstalk canceled by the crosstalk cancel circuit as in the case of the initial reflected sound, and is heard by the listener from as many directions as possible. By doing so, a more natural reverberation sound can be generated.

The present invention has been described above with reference to the embodiments.
The present invention is not limited to these. For example, it will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

[0070]

EFFECTS OF THE INVENTION By making the tone signal to which the cancellation-added initial reflected sound signal is added generated from the two-channel sound source, the listener feels as if the initial reflected sound is heard from the side or diagonally forward. You can create an environment where you can hear a natural musical sound in a hall with excellent acoustic effects. Further, by using the crosstalk canceling means, the reverberation sound adding device can be realized with a simple circuit configuration.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of a reverberation sound adding device.

FIG. 2 is a block diagram showing an overall configuration of an electronic musical instrument configured using the reverberation sound adding device according to the embodiment of the present invention.

FIG. 3 is a graph showing an echo pattern when a musical sound is emitted in a hall.

FIG. 4 is a conceptual diagram showing a position of a virtual sound source when a crosstalk cancellation amount is large.

FIG. 5 is a conceptual diagram showing a position of a virtual sound source when a crosstalk cancellation amount is small.

FIG. 6 is a block diagram showing a circuit configuration of an initial reflected sound generation unit shown in FIG.

7 is a block diagram showing a circuit configuration of the crosstalk cancel circuit shown in FIG.

8 is a block diagram showing a circuit configuration of a rear reverberation sound generation unit shown in FIG.

FIG. 9 is a conceptual diagram showing a path of a sound that reaches a listener when playing a musical instrument or the like in a hall.

FIG. 10 is a conceptual diagram showing a virtual sound source when two speakers are used.

FIG. 11 is a conceptual diagram showing a virtual sound source generated by crosstalk cancellation.

[Explanation of symbols]

1 initial reflection sound generation unit, 2 crosstalk cancellation circuit, 3 rear reverberation sound generation unit, 11 keyboard,
12 RAM, 13 ROM, 14 control section, 15 musical sound generating section, 16 reverberation adding device, 17 sound system, 21 direct sound,
22 early reflection sound, 23 rear reverberation sound, 2
5 direct sound / reverberation area, 26 speakers,
27 listeners, 28,29 early reflection area,
31 delay line, 32,35 high pass filter, 33,36 delay circuit, 34,37 inversion circuit, 41,42 all pass filter, 50
Sound source, 51 Listener, 52 Direct sound, 53
Early reflection sound, 54 holes, 61,71 speaker, 62,72 listener, 63,73 virtual sound source, AD adder, M multiplier

Claims (2)

[Claims] 1. A reverberation sound adding device for adding a reverberation sound to a two-channel music sound signal for producing sound from two sound sources located at the same distance in front of a listener, the input music sound signal supplied from the outside. Initial reflection sound generation means (1) for delaying and attenuating the two-channel initial reflection sound signal, and delaying and phase inverting the two-channel initial reflection sound signal generated by the initial reflection sound generation means. After generating the canceling signal by adding, the addition with the initial reflected sound signal of the other channel is performed, and a cancellation-added initial reflected sound signal for localizing the initial reflected sound outside the two sound sources is generated. Talk canceling means (2), adding the input musical tone signal and the cancellation-added initial reflected sound signal generated by the crosstalk canceling means,
A reverberation sound adding device having reverberation sound adding means (AD2, AD3) for generating output musical sound signals of two channels. 2. A rear reverberation sound generating means (3) for generating a rear reverberation sound signal further delayed and attenuated from the initial reflection sound signal generated by the initial reflection sound generation means on the basis of an input musical sound signal. Wherein the reverberation sound adding means adds an input musical sound signal, a cancellation-added initial reflected sound signal generated by the crosstalk canceling means, and a rear reverberation sound signal generated by the rear reverberation sound generating means, The reverberation sound adding device according to claim 1, wherein an output musical tone signal of two channels is generated.