JPH06130942A - Acoustic effect device - Google Patents

Abstract

PURPOSE:To provide the acoustic effect device which variously changes the spread and the echo of sounds in accordance with the elapse of time to add a sufficient depth to sounds. CONSTITUTION:A reverberating circuit 3 which adds a reverberation signal to a monaural original sound signal, plural delay circuits 4 and 5 which delay the monaural reverberation signal outputted from the circuit 3 by extents of delay different from each other, and plural mixing circuits 6 and 7 which add the monaural reverberation signal and at least one of plural delay monaural reverberation signals outputted from delay circuits 4 and 5 are provided, and a part of mixing circuits 6 and 7 is so constituted that at least one of delay monaural reverberation signals to be added is added to the monaural reverberation signal after having the polarity of the amplitude value inverted, and delay circuits 4 and 5 are so constituted that delay monaural reverberation signals outputted from one and/or the other are inputted to an input part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound effect device in an electronic musical instrument or the like, and more specifically, a reverberation sound signal is added to a monaural original sound signal, and a player desires the monaural reverberation sound signal by a plurality of delay circuits. The present invention relates to an acoustic effect device capable of giving a reverberation effect such as a sense of sound spread to a monaural original sound signal by performing an operation of delaying the time and freely combining the delayed monaural reverberation sound signals.

[0002]

2. Description of the Related Art In an electronic musical instrument such as a keyboard or an electronic piano, a pseudo sound having a frequency in an audible band corresponding to a keyboard selected by a player is synthesized by an electronic calculation method. In this case, in addition to simply synthesizing a desired pseudo sound, a switch, a volume, etc. corresponding to various sound effects are provided in the electronic musical instrument, and a sound effect corresponding to the player's selection of switches etc. is added to the pseudo sound. Is common. As one of the acoustic effects, there is one that gives the listener a reverberation effect that adds a sense of sound broadening. Due to this effect, the listener can get a sense of realism as if the player is playing at the performance hall. Therefore, it is an important technique how to realize such a feeling of sound broadening in an electronic musical instrument.

As such an acoustic effect device, a device as shown in FIG. 6 is known. Sound effect device 81 of FIG.
Has a monaural original sound signal mixing circuit 82, a reverb circuit 83, a delay circuit 84, mixing circuits 85 and 86, and amplitude control circuits 87 to 94.

This monaural original sound signal mixing circuit 82
Is for adding a stereo original sound signal to create a monaural original sound signal.
Are respectively connected to the left channel 95 and the right channel 96 via amplitude control circuits 87 and 88 for controlling the volume of the input stereo original sound signal. The output section 82c is connected to the input section of the reverb circuit 83.

The reverb circuit 83 is for adding a reverberation sound signal to a monaural original sound signal to produce a monaural reverberation sound signal. Its output section is branched into two, one of which is an amplitude control circuit 89. To the input section of the delay circuit 84 via
The other is the amplitude control circuits 92 and 9 via the amplitude control circuit 90.
4 are connected to the respective input sections. Delay circuit 84
Is for delaying the monaural reverberation signal by a predetermined time, and its output section is connected to the input sections of the amplitude control circuits 91 and 93.

The mixing circuits 85 and 76 add the delayed monaural reverberation sound signal and the monaural reverberation sound signal and output them as a stereo signal to the left channel 97 and the right channel 98, respectively.
The input part and the output part of are connected to the output parts of the amplitude control circuits 91 and 92 and the left channel 97, respectively. The input section and the output section of the mixing circuit 86 are connected to the output sections of the amplitude control circuits 93 and 94 and the right channel 98, respectively.

The left channel 97 and the right channel 98 are connected to left and right speakers (neither is shown) via an arithmetic circuit, a D / A converter, and an audio amplifier.

The acoustic effect device 81 adds a stereo original sound signal to create a monaural original sound signal, and adds a reverberation sound signal to the monaural original sound signal to create a monaural reverberation sound signal. Then, the four signals obtained by branching the monaural reverberation sound signal and the delayed monaural reverberation sound signal are respectively controlled by the amplitude control circuits to have predetermined amplitudes, and then combined and added to give a stereo sound spread. There is. This is based on the principle that when the original signal is delayed by 50 to 100 mSec, the delayed signal can be temporally separated from the original signal.

Specifically, in this acoustic effect device 81,
The stereo original sound signals input from the left and right channels 95 and 96 are controlled to have predetermined amplitudes by the amplitude control circuits 87 and 88, respectively, and are added by the monaural original sound signal mixing circuit 82 to become a monaural original sound signal. The reverb circuit 83 adds a reverberation sound signal having a predetermined delay time to the monaural original sound signal to form a monaural reverberation sound signal. This monaural reverberation signal is split into two
One is input to the delay circuit 84 after being controlled to a predetermined amplitude by the amplitude control circuit 89. On the other hand, after the amplitude is controlled to a predetermined amplitude by the amplitude control circuit 90, the other is further branched and controlled to a predetermined amplitude by the amplitude control circuits 92 and 94, and then this amplitude-controlled signal is mixed. , 86 respectively.

The delayed monaural reverberation signal delayed by the delay circuit 84 is branched into two, and the amplitude control circuit 9
After being controlled to have a predetermined amplitude by 1 and 93, they are output to the mixing circuits 85 and 86, respectively.

The mixing circuits 85 and 86 add the input delayed monaural reverberation sound signal and the input monaural reverberation sound signal and output them to the left and right channels 97 and 98, respectively.

As described above, the delayed monaural reverberation signal has a separate characteristic that is temporally separated from the monaural reverberation signal. When these two signals are combined and then output to the left and right channels 97 and 98, D /
Since the sound is output from the left and right speakers (not shown) via the A conversion unit and the like, it is possible to realize stereophonic sound with a wider sound compared to the original sound of stereo.

[0013]

However, such a conventional sound effect device has the following problems. That is, originally, in the stereo sound in the building, the sound is reflected variously and the spread of the sound changes variously with time. However, in the conventional example, the reverberation sound signal is added after simply adding the stereo original sound signal, and the signal and the signal obtained by simply temporally separating the signal are added to each other to provide a sound spread. Was only. In other words, the sound image of the monaural reverberation sound changes from the position determined by the magnitude of the amplitude of the monaural reverberation sound output to the left and right channels to the position determined by the magnitude of the amplitude of the delayed monaural reverberation sound after the delay time elapses. Was just moving. Therefore, since the way of changing the sound image localization is relatively simple, the change in the spread of the sound with the passage of time was poor. In addition, since the combination of the monaural reverberation sound and the delayed monaural reverberation sound was the only combination, the change in sound reverberation was poor.

Further, there are two types of sounds respectively output from the speakers via the audio amplifiers connected to the left and right channels, that is, a monaural reverberation sound and a delayed monaural reverberation sound, and the thickness of the sound is insufficient. It was

The present invention has been made in view of the above problems, and the spread and the reverberation of the sound are variously changed with the passage of time, and the sound can add a sufficient thickness to the sound. An object is to provide an effect device.

[0016]

In order to achieve the above object, a sound effect device according to a first aspect of the present invention outputs from a reverb circuit for adding a reverberation sound signal to a monaural original sound signal and a reverb circuit. A plurality of delay circuits that delay the monaural reverberation sound signals with different delay amounts, and a plurality of delay circuits that add the monaural reverberation sound signal and at least one of the plurality of delayed monaural reverberation sound signals output from the plurality of delay circuits, respectively. And a mixing circuit of a part of the plurality of mixing circuits, wherein at least one of the delayed monaural reverberation signals to be added is inverted into a monaural reverberation signal after inverting the positive / negative of its amplitude value. The delay circuit is configured to add the delayed monophonic reverberation signal output from the delay circuit and / or another delay circuit to the input unit. Characterized in that it is configured to.

In this case, the mixing circuit may have an amplitude control circuit for controlling the amplitude of the delayed monaural reverberation sound signal, and the reverb circuit adds the original sound signals of a plurality of channels to produce a monaural original sound signal. A monaural original sound signal mixing circuit may be included in the input section. Further, the monaural original sound signal mixing circuit may have an amplitude control circuit for controlling the amplitudes of the original sound signals of a plurality of channels.

[0018]

According to the above-described acoustic effect device, after adding the reverberation sound signal to the monaural original sound signal, the signals are delayed by different delay amounts by the plurality of delay circuits, and the delayed signal and the undelayed signal are separated. Since they become a stereo signal after being added to each other, the sound image localization changes with time due to the undelayed signal and the plurality of signals separated at different times. Therefore, the spread of the sound changes variously.

Further, at this time, since the outputs of the plurality of delay circuits are input to the input side of the delay circuits, the density of the reverberation sound signal increases with the passage of time, so that the reverberation of the sound varies with the passage of time. Change. Further, since the outputs of the delay circuits having different delay times are input to the input sides of the other delay circuits, initially, a plurality of reverberation sound signals separated according to the delay time of each delay circuit are output. However, over time, the output signals of multiple delay circuits influence each other, and the output signals of the mixing circuit converge so as to repeat with a fixed delay time, so that separation of reverberation sound signals does not occur. . Therefore, the sound image localization changes with the passage of time, and the spread of the sound changes more variously.

Further, some of the plurality of mixing circuits invert the positive and negative amplitude values when adding delayed monaural reverberations and add the delayed monaural reverberations. Therefore, the signals output from the respective mixing circuits. Has a signal in which the positive / negative of the amplitude is inverted and a signal which is not inverted, and these signals have different characteristics because they have different phases. Therefore, the output signals of the plurality of mixing circuits include more signals having different characteristics, and a thick sound is output.

[0021]

The preferred embodiments of the present invention will be described below in detail with reference to the drawings. First, the configuration of the acoustic effect device according to the present invention will be described. In this embodiment, a microcomputer (hereinafter referred to as "CPU") is used and processing is performed by software. Therefore, for the sake of convenience, first, the concept of the configuration of the acoustic effect device will be described with reference to FIG.
The sound effect device 1 is composed of a monaural original sound signal mixing circuit 2, a reverb circuit 3, delay circuits 4, 5, mixing circuits 6, 7, feedback mixing circuits 8, 9 and amplitude control circuits 10-23.

The monaural original sound signal mixing circuit 2 is
This is for creating a monaural original sound signal by adding the stereo original sound signals input from the A and B channels 24 and 25, and the input part thereof is the signal control circuit 1.
The stereo original sound signals, which are connected to output parts of the electronic musical instrument via 0 and 11, respectively, and which are artificially created corresponding to the selection of a keyboard (not shown), are transmitted from the electronic musical instrument.
The output section is connected to the input section of the reverb circuit 3. Here, the amplitude control circuits 10 and 11 are for controlling the amplitude of the input signal and are not particularly limited, but the player selects a numerical value in the range of -1 to 1 inclusive of 0. Then, the amplitude value of the input signal is multiplied by the numerical value, and the amplitude of the output signal of the amplitude control circuits 10 and 11 is set. The same applies to the amplitude control circuits 12 to 23 described later.

The reverb circuit 3 is for adding a reverberation sound signal to a monaural original sound signal to produce a monaural reverberation sound signal, and has 16 delay circuits incorporated therein.
The output part is branched into four, and the amplitude control circuits 12 and 1 are provided.
3, 20 and 21 are respectively connected to the input sections.

The delay circuits 4 and 5 are for producing delayed monaural reverberation sound signals from the monaural reverberation sound signals. The input portions of the delay circuits 4 and 5 are fed back to the amplitude control circuit 12 via the feedback mixing circuits 8 and 9. 14, 23 and 13,
The output parts of the amplitude control circuits 14, 16, 17, 22 and 15, 18, 1 are connected to the output parts of 15 and 22, respectively.
They are connected to the input sections of 9 and 23, respectively. In this case, the player can freely set the delay amounts of the delay circuits 4 and 5 by selecting a delay amount setting switch provided on an electronic musical instrument (not shown).

The mixing circuits 6 and 7 combine and add two delayed monaural reverberation sound signals and monaural reverberation sound signals having different delay times, and the input parts of the mixing circuits 6 and 7 are amplitude control circuits 16 respectively. , 19, 20 and 17, 18, 21 are respectively connected to the output units, and the output units are connected to the left and right channels 26 and 27, which are the channels of the stereo signal, respectively. Here, the left and right channels 26 and 27 are arithmetic circuits (not shown),
They are connected to the speakers via the D / A converter and the audio amplifier, respectively.

Next, the operation of the sound effect device 1 according to the present invention will be described in detail with reference to FIGS. Figure 2
1 shows the configuration of a DSP (Digital Signal Processor) that constitutes the sound effect device 1 of FIG. 1 in the present embodiment. This DSP consists of two DSPs with exactly the same configuration.
(DSPa41, DSPb51), only the configuration of DSPa41 is shown in FIG. 2 as a representative.
The same circuits forming P will be described using the same reference numerals. The DSPa 41 performs the operations of the monaural original signal mixing circuit 2 and the reverb circuit 3,
The Pb 51 operates the delay circuits 4 and 5 and the mixing circuits 6 and 7. In addition, DSPa41 and DSPb
The data buses 51 and 51 are connected to each other via I / O (Input output) 50.

Next, DSPa41 and DSPb51 shown in FIG.
3 is shown as a flowchart in FIG. 3 and will be described in detail with reference to FIG. Here, the CPU (not shown) controls all the operations. First, when the player selects a keyboard of an electronic musical instrument such as an electronic piano (not shown) and a switch corresponding to a sound effect, the CPU (not shown) selects a 24-bit digital signal from the original sound signal data RAM (not shown). The stereo original sound signal data composed of signals is converted into A and B channels 24 and 25 at a predetermined repetition period.
(Step 101). Here, the original sound signal data RAM stores the waveform of the sound corresponding to the keyboard and is built in a system controller unit (not shown).

Next, the monaural original sound signal mixing circuit 2 in FIG. 1 adds the stereo original sound signals to create a monaural original sound signal (steps 102 to 104). Each step will be described below.

The CPU outputs the original sound signal data of the A channel 24 from the original sound signal data RAM onto the data bus 42. The multiplier 45 takes in the original sound signal data from the data bus 42 and temporarily stores it in a data register (not shown) inside the multiplier 45. Next, 1 is written in the coefficient RAM 43 in correspondence with the player's amplitude setting.
The coefficient data of 6 bits is output to the coefficient bus 44. The coefficient in this case is not particularly limited, but it is assumed that 1 is selected in this embodiment. The multiplier 45 stores this coefficient data in an internal coefficient register (not shown) and multiplies it with the already-stored original sound signal data. The data after this multiplication is stored in the buffer 47 via the adder 46 (step 102).

Next, the original sound signal data of the B channel 25 is fetched from the data bus 42 into the multiplier 45 in the same manner as in step 102, and the coefficient data output from the coefficient RAM 43 (in this case, the same as in step 101). 1 is selected by the above) and the multiplied data is stored in the adder 46 (step 10).
3).

Thereafter, the original sound signal data of the A channel 24 already stored in the buffer 47 is taken into the adder 46, and the stereo original sound signal data composed of the two channels 24 and 25 of A and B are added to each other. Monaural original sound signal data. This data is stored in buffer 4
It is stored in a predetermined address of the data RAM 49 via 8 (step 104). The addition operation of the monaural original sound signal mixing circuit 2 is completed by performing the above operation every predetermined time.

Next, the reverb circuit 3 of FIG. 1 creates monaural reverberation sound signal data having reverberation time and amplitude according to the player's selection from the monaural original sound signal data created in step 104 (step 105). Specifically, the first data of the monaural original sound signal data stored in the data RAM 49 is read onto the data bus 42 and input to the multiplier 45. Next, coefficient data corresponding to the amplitude of the selected reverberation sound signal is output from the coefficient RAM 43, and the multiplier 45 multiplies the monaural original sound signal data by this coefficient. The multiplied data is stored in the data RAM 49. After that, monaural reverberation sound signal data is created by repeating the operation of multiplying coefficient data corresponding to a predetermined amplitude at predetermined time intervals a number of times corresponding to the length of the reverberation time. By repeating the same operation for each monaural original sound signal data, a monaural reverberation sound signal is created and the reverb operation is completed (step 105).

Next, the delay circuits 4 and 5 in FIG. 1 delay the monaural reverberation signal by the delay time selected by the player (steps 106 and 107). In this embodiment, the delay times of the delay circuits 4 and 5 are not particularly limited, but the operation will be described assuming that they are set to 50 mSec and 100 mSec, respectively. Note that this operation is performed by the DSPb 51.

Since the delay circuits 4 and 5 perform the same operation as each other, the operation of the delay circuit 4 will be described as a representative. First, DS
D from the data RAM 49 of Pa41 via I / O50
The first data of the monaural reverberation signal stored in the data RAM 49 of the SPb 51 is output to the multiplier 45. Next, as a feedback amount of the amplitude control circuit 14, a coefficient R
Of the coefficients stored in the AM 43, the coefficient selected by the player (which is not particularly limited, but 0.5 is selected in this embodiment) is output to the multiplier 45, and the monaural reverberation signal data is output. And the coefficient (0.5) are multiplied by the multiplier 45.

When the delayed monaural reverberation signal output of the delay circuit 5 is input to the input side of the delay circuit 4, the delay circuit is output with a delay (50 mSec) between the delay times of the delay circuit 4 and the delay circuit 5. The output data of No. 5 is multiplied by a predetermined coefficient in the multiplier 45 by the same operation as described above.

These multiplied data are added to the adder 46.
Then, the result is stored in the buffer 47. This data is set as the feedback amount by the amplitude control circuits 14 and 23, and becomes the feedback amount of the delayed monaural reverberation signal fed back to the input side of the delay circuit 4.

Next, the data of the monaural reverberation signal after the delay time of the delay circuit 4 is output from the data RAM 49 to the adder 46 via the multiplier 45. This data and the data previously stored in the buffer 47 are added by the adder 46, the added data is stored in the buffer 47 as new data, and the monaural reverberation signal already stored in the data RAM 49 is stored. It is stored in a predetermined address of the data RAM 49 as the first data after the delay time has elapsed.

Next, the next data of the monaural reverberation sound signal stored in the data RAM 49 is output to the multiplier 45 and then again multiplied by a coefficient of 0.5, and the multiplied data is again buffered by the buffer 47. To store. Then, the next data after the delay time of the monaural reverberation signal is changed to the data R
Output from the AM 49 to the adder 46 via the multiplier 45,
After this data and the data previously stored in the buffer 47 are added by the adder 46, the added data is processed in the same manner as the operation already performed. As described above, the operation of adding 50% of the previous monaural reverberation signal to the monaural reverberation signal after the delay time is repeated one after another, so that the monaural reverberation signal becomes a repetitive sound and the delayed monaural reverberation signal is repeated. Will be present in the data.

In parallel with the above operation, the data RAM 49
The delayed monaural reverberation signal data stored in
After mSec has elapsed, the data is read from the data RAM 49. As a result, this data becomes a delayed monaural reverberation signal produced by the delay circuit 4 (step 106). Similarly, the delay operation of 100 mSec of the delay circuit 5 is performed (step 107). With the above, the operations of the delay circuits 4 and 5 are completed.

Next, the mixing circuits 6 and 7 of FIG. 1 set the amplitudes of the two delayed monaural reverberation signals delayed by the delay circuits 4 and 5 to a predetermined value corresponding to the player's free choice, In addition, the signals are combined with the monaural reverberation signal and added to produce left and right channels 26, 2
Two data for 7 are created respectively (step 10
8, 109). The details will be described below.

First, the operation of the amplitude control circuits 16 and 18 shown in FIG. 1 will be described. Data RAM 49 of DSPa51
Among the data of the delayed monaural reverberation signal stored in the predetermined address of, the data as the output of the delay circuit 4 is
The data is output to the multiplier 45, and the coefficient RAM4 is selected by the player.
The coefficient data output from 3 is multiplied by the multiplier 45. The multiplied data is temporarily stored in the buffer 47 via the adder 46. Here, although the coefficient data of the amplitude control circuit 16 is not particularly limited, it is set to 1, and in that case, data of the same amplitude as the delayed monaural reverberation signal is output to the mixing circuit 6. In this case, without changing the amplitude value of the modulation signal by the player's selection,
To invert only the positive and negative of the amplitude value, use -1 as the coefficient. In the present embodiment, the amplitude control circuit 1
1 is also set as the amplitude control amount of 8, and the same operation as described above is performed on the data as the output of the delay circuit 5. Further, it is assumed that −0.2 is set as the amplitude control amount of the amplitude control circuits 17 and 19 described later, and 0.5 is set as the amplitude control amount of the amplitude control circuits 20 and 21.

Next, the amplitude control circuits 17 and 19 for performing an operation of producing a phase-inverted delayed monaural reverberation sound signal by inverting the positive / negative of the amplitude of the delayed monaural reverberation sound signal will be described. The data as the output of the delay circuit 5 is output to the multiplier 45, where it is multiplied by the coefficient data (-0.2). This multiplied data is added by the adder 46 to the data already stored in the buffer 47, and stored in the buffer 47 as new data.

Next, regarding the operation of the amplitude control circuits 20 and 21, the monaural reverberation sound signal is multiplied by the multiplier 45 by the same operation as described above and added by the adder 46. The signal data of the left and right channels 26 and 27 created by the above operation is stored in the data RAM 4
9 is stored. By the above, the mixing operation by the mixing circuits 6 and 7 is completed (steps 108 and 10).
9) In the signals of the left and right channels 26 and 27, a plurality of different kinds of sound signals are present.

With the above operation, the mixing circuits 6 and 7 of FIG. 1 can arbitrarily combine the three signals of the two delayed monaural reverberation sound signals and the monaural reverberation sound signal, and at that time, all of them can be combined. The positive and negative of the amplitude and amplitude value of the signal can be freely set.

Left and right channel 2 made by the above
The spread, sound and thickness of the sound due to the stereo signals 6 and 27 will be described with reference to FIGS. The upper and lower diagrams of FIG. 4A show the waveforms of the stereo signals of the left and right channels 26 and 27 delayed by the delay circuits 4 and 5, respectively. Reference numerals 61a and 61b denote monaural reverberations added directly by the mixing circuits 6 and 7 via the amplitude control circuits 20 and 21, respectively, and 62a and 62b are delayed by the delay circuits 4 and 5, respectively. These are delayed monaural reverberations output from each.

Reference numerals 63a and 63b denote phase inversion delayed monaural reverberation signals output from the mixing circuits 6 and 7 after the positive and negative of the amplitude of the delayed monaural reverberation signal are inverted by the amplitude control circuits 19 and 17, respectively. . From the relationship of the coefficient data of the amplitude control circuit described above, the phase inversion delayed monaural reverberation sound signals 63a, 63b are inverted from the delayed monaural reverberation sound signals 62a, 62b in the positive / negative of the amplitude value and the amplitude is 1 / min. There is a relationship of 5. In this figure, the amplitude control circuits 14, 15, 22, 23
The delayed monaural reverberation signal fed back via is omitted for convenience of explanation.

FIG. 4B shows the left and right channel 2
It shows how the sound sources of the respective signals are located with respect to the positions of the speakers when the stereo signals 6 and 27 are converted into analog signals, amplified, and then connected to the left and right speakers. According to this, the monaural reverberation 61
Since a and 61b have the same phase and the same amplitude, they are heard from the sound image position 64 at the center position of the left and right speakers.
On the other hand, the delayed monaural reverberation sounds 62a and 62b are temporally separated due to the different phases, so that they are heard from the sound image positions 65a and 65b at the positions of the left and right speakers, respectively.

Further, the phase inversion delay monaural reverberation sound 63
a and 63b have different phases because their positive and negative amplitudes are inverted, and are temporally separated from the delayed monaural reverberation sounds 62a and 62b, so that the sound image positions 66a and 66b at the positions of the left and right speakers are separated. From each comes separately. Therefore, if the delay time is set to a certain length by the delay circuits 4 and 5, the sound image position 64
I heard the monaural reverb sound, and then the delayed monaural reverb sound 6
5a and 65b and phase inversion delay monaural reverberation sounds 66a and 6
6b can be heard from the left and right speakers, respectively. As a result, as shown in FIG. 4C, the sound output from the speaker has a sound image 67 that pops out from the center of the rear part of the speaker to the front part, so that the spread of the sound varies. In addition, since there are five different sound sources in the sense of hearing, it is possible to add thickness to the sound.

In order to equalize the amplitudes of the delayed monaural reverberations at the positions of the left and right speakers and the monaural reverberations at the center of the left and right speakers, the coefficients of the amplitude control circuits 20 and 21 are set. The data is set to 0.5, and the amplitude control circuits 16, 18 and 17, 19 are used.
Coefficient data of 0.8 to 1.0 and 0.2 to 0.
It may be set to 0, and the addition value of the coefficient data of the amplitude control circuit 16 and the addition value of the coefficient data of the amplitude control circuit 17 and the addition value of the coefficient data of the amplitude control circuit 18 and the amplitude control circuit 19 may both be 1.0. When the coefficient data is negative, the numerical values of the coefficient data described above are all absolute values.

Next, the amplitude control circuit 1 of the delay circuits 4 and 5
How the feedback of 4 and 15 changes the reverberation sound will be described with reference to FIG. Figure 5 (a)
Shows a waveform of the delayed monaural reverberation sound when the delayed monaural reverberation sound signal is fed back. According to this, the delayed monaural reverberation sound 69 has a waveform delayed by the delay time 70. Also, a delayed monaural reverberation 69
After setting the amplitude of 1 to a predetermined value by the amplitude control circuits 14 and 5, it is fed back and similarly delayed by the delay circuits 70 in the delay circuits 4 and 5 to form waveforms 71 and 72. These sounds are delayed monaural reverberations 69, 71, 72.
Are added to each other, the reverberant sound density increases with time. As a result, the sound reverberation changes with the passage of time.

Next, how the spread of the reverberation sound changes due to the feedback by the amplitude control circuits 22 and 23 will be described with reference to FIG. The figure shows delay circuits 4, 5
It represents the impulse response of. When a pulse having an extremely short time width is input to the delay circuits 4 and 5, the pulses 73 and 74 are output from the delay circuits 4 and 5 after the delay time has elapsed. Further, since the output of the delay circuit 4 is input to the delay circuit 5 and the output of the delay circuit 5 is input to the delay circuit 4 by feedback, the pulse 7 shown in FIG.
5 and 76 are output from the delay circuits 4 and 5, respectively. Similarly, pulses 77 and 78 are output as time passes.

According to this, first, the pulses 73, 74
Are output after the delay time set by the delay circuits 4 and 5 has passed, but the signals of each other influence each other with the passage of time,
The delay circuit 4 and the delay circuit 5 repeatedly output the signals so that they converge and are repeated at the delay time difference. That is, initially, the two delayed monaural reverberations have different phases and are separated from each other, but the phases overlap with each other with the passage of time and the separation does not occur. by this,
As shown in FIG. 5C, a sound image 7 in which the initially expanded sound is gradually sucked into the center positions of the left and right speakers.
Since it has 9, it is possible to change the spread of the sound.

As described above, according to this embodiment, the monaural original sound signal mixing circuit 2 converts a stereo signal into a monaural original sound signal. Then, a sound reverberation is added to the monaural original sound signal, a reverberation sound signal is added by the reverb circuit 3, a delay operation is performed by the delay circuits 4 and 5, and a mixing operation is performed by the mixing circuits 6 and 7.
Further, by inputting the delayed monaural reverberation sound signal to the input sections of the delay circuits 4 and 5, the spread and the reverberation of the sound change with the passage of time. Also, the amplitude control circuits 17 and 19
Since the phase inversion delayed monaural reverberation signal is generated from the delayed monaural reverberation signal, the sound can be made thick. Further, the amplitude control circuits 10 to 21 allow the reverb circuit 3, the delay circuits 4 and 5, and the mixing circuits 6 and 7.
Since the amplitude of the signal input to the can be set freely, it is possible to give various changes in the sound reverberation, spread, and thickness.

Further, since the delayed monaural reverberation signal and the phase-inverted delayed monophonic reverberation signal obtained by inverting the phase of the signal are output from the left and right channels, unnecessary harmonics are canceled out, and the sound has a peculiarity. It is possible to realize the effect that a natural sound is created.

The present invention is not limited to the above-mentioned embodiment. For example, the number of DSPs is not limited to two, and more DSPs are provided.
Alternatively, it may be one. Further, the control method in the DSP can be appropriately changed without departing from the scope of the present invention.

[0056]

As described above, according to the present invention, the spread and the reverberation of the sound are variously changed with the passage of time, and the sound can have a sufficient thickness. Therefore, an excellent acoustic effect can be realized.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of the configuration of a sound effect device of the present invention.

FIG. 2 is a configuration diagram of a DSP in the acoustic effect device of the present invention.

FIG. 3 is a flowchart of the operation of the sound effect device of the present invention.

FIG. 4 is a diagram for explaining the spread of sound obtained by the acoustic effect device of the present invention.

FIG. 5 is a diagram for explaining the reverberation and spread of sound obtained by the acoustic effect device of the present invention.

FIG. 6 is a diagram showing a conventional acoustic effect device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Acoustic effect device 2 Monaural original sound signal mixing circuit 3 Reverb circuit 4 Delay circuit 5 Delay circuit 6 Mixing circuit 7 Mixing circuit 10 Amplitude control circuit 11 Amplitude control circuit 16 Amplitude control circuit 17 Amplitude control circuit 18 Amplitude control circuit 19 Amplitude control circuit 20 Amplitude control circuit 21 Amplitude control circuit 22 Amplitude control circuit 23 Amplitude control circuit 24 A channel 25 B channel

Claims (4)

[Claims] 1. A reverb circuit for adding a reverberation sound signal to a monaural original sound signal, a plurality of delay circuits for delaying the monaural reverberation sound signals output from the reverb circuit with different delay amounts, and the monaural reverberation circuit. A plurality of mixing circuits that respectively add a sound signal and at least one of the plurality of delayed monaural reverberation sound signals output from the plurality of delay circuits, and a part of the plurality of mixing circuits. The circuit is configured to add at least one of the delayed monaural reverberation signals to be added to the monaural reverberation signal after inverting the positive / negative of its amplitude value, and the delay circuit is configured to add the delay circuit and / or Alternatively, a sound characterized by being configured so that the delayed monaural reverberation signal output from another delay circuit is input to the input section. Effect device. 2. The acoustic effect device according to claim 1, wherein the mixing circuit has an amplitude control circuit that controls the amplitude of the delayed monaural reverberation signal. 3. The acoustic reverberation circuit according to claim 1, wherein the reverb circuit has a monaural original sound signal mixing circuit for adding a plurality of channels of original sound signals to generate a monaural original sound signal at an input section. Effect device. 4. The acoustic effect device according to claim 3, wherein the monaural original sound signal mixing circuit has an amplitude control circuit for controlling the amplitudes of the original sound signals of the plurality of channels.