JPH04343600A - Reverberation device - Google Patents

Abstract

PURPOSE:To display a reverberation effect without a feeling of physical disorder by selecting a system matching with the genre of a music source out of plural reverberation sound adding means. CONSTITUTION:A parameter controller 6 controls an initial reflected sound former 8, a reverberation sound former 9 and an indirect sound former 10 in accordance with the selection of switches 2 to 5. While changing a mixing rate between a direct sound from a music reproducer 1 and a formed sound, both the sounds are added by an adder 15 and a reverberation sound matched with each music source is added.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverberation device applied to surround processors and the like.

0002

[Prior Art] Fig. 5 shows, for example, Japanese Patent Publication No. 62-52878.
It is a block diagram showing the structure of the conventional reverberation device shown in the publication, and in the same figure, 17 is a signal input terminal;
8 is an amplifier with a gain k1, 19 is a delay circuit with a delay time t1, and 20 is an output terminal.

[0003] Next, the operation of the above configuration will be explained. The signal input to the signal input terminal 17 is branched, and the branched signal is multiplied by k1 in the amplifier 18, then delayed by t1 seconds in the delay circuit 19, added to the above input signal, and output to the output terminal 19. be done. The signal outputted to the output terminal 19 is a simulation of only one sound emitted from the sound source that directly reaches the ear and one reflected sound, and the method shown in Fig. 5 has a small amount of reflected sound from the reverberant signal. .

FIG. 6 is a block diagram showing the configuration of another conventional reverberation device disclosed in the above-mentioned Japanese Patent Publication No. 62-52878. In the figure, 17 is a signal input terminal;
21 is an attenuator with an attenuation rate k2, 3 is a delay circuit with a delay time t2, and 20 is an output terminal.

Next, the operation of the configuration shown in FIG. 6 will be explained. An output signal is branched from the output terminal 20, and the branched signal is k2 (0≦k2 <1) at the attenuator 21.
After being attenuated twice, it is delayed by t2 seconds in the delay circuit 22 and added to the signal input to the input terminal 17 to generate a group of equally spaced reflected sounds. This simulates a group of reflected sounds in which the sound emitted from the sound source is reflected many times by walls and reaches the ear.

In the method shown in FIG. 6, the peak in the transmission characteristic is easily detected audibly, and unless the attenuation rate k2 is sufficiently small, coloration, that is, unnatural coloring of the sound quality, will occur. .

FIG. 7 is a block diagram showing the configuration of another conventional reverberation device disclosed in the above-mentioned Japanese Patent Publication No. 62-52878. In the figure, 17 is a signal input terminal;
23 is an amplifier with a gain k3, 24 is an amplifier with a gain k4, 25 is an amplifier with a gain k5, 26 is a delay circuit with a delay time t3, and 20 is an output terminal.

FIG. 7 shows a circuit known as an all-pass reverberation circuit, where k3 = -k5, k4 = 1-k
By setting it to 32, the transmission characteristic has a flat response amount with respect to frequency. As described above, the method of FIG. 7 has a constraint condition between the gains k3, k4, and k5, and the degree of freedom in control is insufficient.

FIG. 8 is a block diagram showing the configuration of another conventional reverberation device, in which 27a is a left channel input terminal, 27b is a right channel input terminal, 28 is an amplifier with a gain of k6, and 29 is a gain k7 amplifier, 30a
30b is a left channel output terminal, and 30b is a right channel output terminal.

Next, the operation of the configuration shown in FIG. 8 will be explained. By subtracting the signal input to the right channel input terminal 27b from the signal input to the left channel input terminal 27a, indirect sound components are obtained, which are input to amplifiers 28 and 29, respectively. The indirect sound component input to one amplifier 28 is multiplied by k6 (k6>0) and added to the signal input to the left channel input terminal 27a. In addition, the indirect sound component input to the other amplifier 29 is k7
(k7 > 0) multiplied by right channel input terminal 27b
is subtracted from the input signal. Since the above-mentioned indirect sound component contains a lot of reverberant sound, the level of the reverberant sound is increased by amplifying the indirect sound component.

In the method shown in FIG. 8, if k6 and k7 are made too large, a feeling of inverse phase will occur, giving a sense of discomfort.

0012

[Problems to be Solved by the Invention] Since conventional reverberation devices are configured as described above, each method is dependent on the music source, such that the audible disadvantages or advantages are likely to be noticeable depending on the music source. The problem was that it was strong.

[0013] This invention was made to solve the above-mentioned problems, and can reduce dependence on music sources, such as creating a sense of discomfort depending on the music source or making it difficult to understand the effect of reverberation. The purpose is to provide a reverberation device.

[0014]

[Means for solving the problem] Claim 1 of this invention
The reverberation device includes a first reverberation sound adding means that inputs a stereo music signal to a plurality of delay circuits connected in parallel and attenuates or amplifies the output signal of the delay circuit, and a first reverberation sound adding means that inputs the stereo music signal to the delay circuit and delays a second reverberation sound adding means that attenuates the output signal of the circuit and adds it to the input signal; and a third reverberation sound adding means that amplifies and delays the difference signal between the left channel and the right channel of the stereo music signal and adds it to the left channel and the right channel. a reverberant sound adding means; a parameter control means for changing the effect amount of the first, second and third reverberant sound adding means; and a reproduced music signal and the first, second and third reverberant sound adding means. It is characterized by comprising an adder that adds the output signal of.

The parameter control means in claim 1 includes a parameter for increasing the ratio of the effect amount of the first reverberation sound adding means, a parameter for increasing the ratio of the effect amount of the second reverberation sound addition means, and a parameter for increasing the ratio of the effect amount of the second reverberation sound addition means. A device configured such that the parameter for increasing the ratio of the effect amount of the reverberation sound adding means (3) is changed over by a switch is used.

Further, as the parameter control means according to claim 1, the first,
It is also possible to use a device configured to change the effect amount of the second and third reverberation sound adding means.

Further, the reverberation device according to claim 4 of the present invention includes a first reverberation sound adding means that inputs the stereo music signal to a plurality of delay circuits connected in parallel and attenuates or amplifies the output signal of the delay circuit. a second reverberation sound adding means that inputs the reproduced music signal to a delay circuit, attenuates the output signal of the delay circuit and adds it to the input signal; and a second reverberation sound adding means that amplifies the difference signal between the left channel and the right channel of the stereo music signal. a third reverberant sound adding means that delays and adds the reverberant sound to the left channel and the right channel; an effect amount variable means that changes the effect amount of the first, second and third reverberant sound adding means; and the first and third reverberant sound adding means. reverberation sound method selection means for selecting one, two, or three means from the second and third reverberation sound addition means; and addition for adding the output signal of the selected reverberation sound addition means to the reproduced music signal. It is characterized by being equipped with a container.

[0018] As the reverberation sound method selection means according to the fourth aspect, there is used one which is configured to be selectable by a switch from among the first, second and third reverberation sound addition means according to the music source.

Further, as the reverberation sound method selection means according to claim 4, the first and second reverberation sound methods are selected according to the speed of change of the music signal.
Also, a device configured to switch the third reverberation sound adding means may be used.

[0020]

[Operation] According to claim 1 of the present invention, the effect amounts of the first, second and third reverberation sound adding means are controlled to be changed through the parameter control means in accordance with the music signal. By changing the mixing ratio with the direct sound and adding it using an adder, it is possible to add reverberant sound that matches the music source and produce a reverberant effect that does not feel unnatural.

Further, according to claim 4 of the present invention, the first
, by selecting one, two, or three of the second and third reverberant sound adding means and varying their effect sizes, a reverberation effect that matches the genre of the music source is exerted. It is possible to eliminate dependence on the music source, which can cause an unnatural feeling or make it difficult to understand the reverberation effect.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a reverberation device according to an embodiment of the present invention. In the figure, 1 is a music player such as a CD, and 2 to 5 are first to fourth units for switching the reverberation sound addition method. A switch 6 is a parameter controller serving as a parameter control means, and controls the parameters of each reverberation sound addition method in accordance with switching of the first to fourth switches 2 to 5. 7 is a gain controller, which controls the first
- Control the gain of each reverberation sound addition method according to the switching of the fourth switches 2 to 5.

Reference numeral 8 denotes an early reflection sound generator, which is connected to a music source and whose parameters are controlled by the parameter controller 6 described above. Reference numeral 9 denotes a reverberation sound generator, which is connected to a music source and whose parameters are controlled by the parameter controller 6 described above. 10 is an indirect sound generator,
It is connected to a music source and its parameters are controlled by the parameter controller 6 mentioned above. Reference numerals 11 to 14 are amplifiers whose gains are controlled by the gain controller 7, and the early reflected sound generator 8, reverberant sound generator 9, indirect sound generator 10, and amplifiers 11 to 14 provide the first, second, and A third reverberation sound adding means is configured. 15 is an adder connected to the outputs of the amplifiers 11 to 14, and 16 is an output terminal of the adder 15.

Next, the operation of the above configuration will be explained. A music signal obtained by playing a music source with the music player 1 is input to the early reflection sound generator 8, and is output at a volume level corresponding to the delay time and wall reflectance corresponding to the virtual room. be done. This simulates the early reflected sound, and outputs a plurality of simulated reflected sounds. At this time, the size of the virtual room and the reflectance of the walls are set by switch 2.
It is controlled by the parameter controller 6 according to the switch selected from among the switches 5 to 5.

The plurality of simulated reflected sounds outputted from the early reflected sound generator 8 are input to the amplifier 11 and amplified according to the mixing ratio with the direct sound. The amplification factor of this amplifier 11 is controlled by a gain controller 7 according to the switch selected from the switches 2 to 5, and its output is input to an adder 15 and added to the direct sound.

Furthermore, the music signal obtained by reproducing the music source with the music player 1 is also input to the reverberation sound generator 9,
High-order reflected sound is simulated by cumulatively adding the signals through an attenuator (not shown) depending on the size of the virtual room and the reflectance of the walls. The simulated reverberant sound output from the reverberant sound generator 9 is input to the amplifier 12 and amplified according to the mixing ratio with the direct sound. The amplification factor of this amplifier 12 is controlled by a gain controller 7 according to the switch selected from the switches 2 to 5, and its output is input to an adder 15 and added to the direct sound.

Furthermore, the music signal obtained by reproducing the music source with the music player 1 is also input to the indirect sound generator 10, and the level of the indirect sound component is adjusted according to the reflectance of the walls of the virtual room. amplify. The output signal from the indirect sound generator 10 is input to the amplifier 13 and amplified according to the mixing ratio with the direct sound. The amplification factor of this amplifier 13 is the switch 2
It is controlled by a gain controller 7 according to the switch selected from among the switches .about.5, and its output is input to an adder 15 and added to the direct sound.

On the other hand, the direct sound, which is the output signal of the music player 1, is amplified by the amplifier 14 and input to the adder 15. Then, by selecting switches 2 to 5, the type and mixing ratio of the reverberation sound addition method to be added to the direct sound are arbitrarily selected. For example, switch 2 increases the mixing ratio of the early reflection sound method, switch 3 increases the mixing ratio of the reverberation sound method,
Switch 4 increases the mixing ratio of the indirect sound method, and switch 5 makes the mixing ratio of the three methods about the same. Thereby, by selecting switches 2 to 5, it is possible to arbitrarily select the optimum system for the music source.

In the above embodiment, the three outputs of the early reflected sound generator 8, the reverberant sound generator 9, and the indirect sound generator 10 are added, but the two reverberant sound addition methods among them are It is also possible to select and add.

FIG. 2 shows another embodiment of the present invention. In the embodiment described above, the mixing ratio of the reverberation sound adding means to the direct sound is changed by external switches 2 to 5. The mixing ratio to the direct sound may be changed depending on the speed of change, and FIG. 2 is a block diagram showing the configuration for this purpose.
Since these components are the same as those in the embodiment shown in FIG. 1, the same reference numerals are given to the corresponding parts and the explanation thereof will be omitted.

In FIG. 2, 31 is a delay circuit that delays the output signal of the music player 1, and 32 and 35 are absolute value circuits, which output the magnitude of the output signal of the music player 1. 33 is a low-pass filter (hereinafter referred to as LPF) connected to the output of the absolute value circuit 32, and 34 and 36 are LPFs.
A peak hold circuit 33 is connected to the output of the absolute value circuit 35, and a divider 37 is connected to both the peak hold circuits 34 and 36.

Next, the operation of the configuration shown in FIG. 2 will be explained. The music signal input to the absolute value circuit 32 is LPF
33, and the slower the change, the larger the level is output. A peak hold circuit 34 detects and holds the maximum value of the output of the LPF 33. On the other hand, the absolute value circuit 35 outputs the magnitude of the output signal of the music player 1, and the peak hold circuit 36 detects and holds the maximum value. Here, the output of the peak hold circuit 34 is V1, the output of the peak hold circuit 36 is V2, and the divider 37
Calculate (V1 /V2), and then calculate (V1 /V2)
) is closer to 0, the faster the music signal changes.

[0033] In a rapidly changing music signal, if a large amount of early reflected sound is mixed, the double-hitting feeling becomes noticeable, so indirect sound and reverberant sound are mixed in a larger amount. Further, when (V1 /V2) approaches 1, it indicates that the change in the music signal is gradual, and in this case, it is difficult to understand the effect with just the reverberant sound, so a large amount of early reflected sound is mixed. Note that the delay circuit 31
It functions to add reverberation sound after setting the reverberation effect according to the speed of the loud signal.

FIG. 3 is a block diagram showing the configuration of a reverberation device according to yet another embodiment of the present invention, in which 1, 6, 8 to 10, 15, 16 are the same as those in the embodiment shown in FIG. Since these are the constituent elements, the same reference numerals are given and the explanation thereof will be omitted.

In FIG. 3, 44 to 47 are first to fourth switches for setting the genre of the music source; 38 to 41;
are the first to fourth switches for setting the reverberation effect amount, 43
42 is a surround system controller which outputs control signals in accordance with the switches 44 to 47, and 42 is a switch that is switched by the surround system controller 43.

Next, the operation of the configuration shown in FIG. 3 will be explained. A music signal obtained by reproducing a music source by the music player 1 is input to an adder 15. Further, by selecting the first to fourth switches 38 to 41 for setting the reverberation effect amount, the level and reverberation time of each reverberation sound addition method are controlled by the parameter controller 6 and input to the adder 15. This creates the feeling that you are listening in a small room or in a large room.

Furthermore, by selecting the first to fourth switches 44 to 47 for setting the genre of the music source, the surround system controller 43 and the switch 42 are controlled according to the selected switch, and the early reflections are controlled. One or more inputs from the sound generator 8, the reverberant sound generator 9, and the indirect sound generator 10 are connected to the output of the music player 1, and the connected reverberant sound adding means converts the reproduced music signal into A reverberant sound is generated and inputted to the adder 15. As a result, reverberation sounds according to the genre of the set music source are added and output.

In the embodiment shown in FIG.
Although the output of the reverberation sound adding means and the output of the adder 15 are switched, the configuration may be such that the output of the reverberation sound adding means and the output of the adder 15 are switched.

Further, in the embodiment shown in FIG. 3, the changeover switch 42 is used to switch the reverberation sound adding means between the connected state and the disconnected state. The mixing ratio of the output signal of the reverberation sound adding means and the output signal of the music reproducing device 1 may be continuously changed by using a suitable amplifier.

Furthermore, in the embodiment shown in FIG. 3, switching of the reverberation sound adding means is selected using the switches 44 to 47, but it is also possible to switch the reverberation sound adding means according to the speed of change of the music signal. FIG. 4 is a block diagram showing the configuration for that purpose, and in the same figure, 1, 6,
8 to 10, 15, 16, and 38 to 43 are the same constituent elements as those in the embodiment shown in FIG.

In FIG. 4, 31 is a delay circuit that delays the output signal of the music player 1, and 32 and 35 are absolute value circuits, which output the magnitude of the output signal of the music player 1. 33 is an LPF connected to the output of the absolute value circuit 32; 34
and 36 are peak hold circuits respectively connected to the output of the LPF 33 and the output of the absolute value circuit 35, and 37 is a divider connected to both the peak hold circuits 34 and 36.

Next, the operation of the configuration shown in FIG. 4 will be explained. The music signal input to the absolute value circuit 32 is LPF
33, and the slower the change, the larger the level is output. A peak hold circuit 34 detects and holds the maximum value of the output of the LPF 33. On the other hand, the absolute value circuit 35 outputs the magnitude of the output signal of the music player 1, and the peak hold circuit 36 detects and holds the maximum value. Here, the output of the peak hold circuit 34 is V1, the output of the peak hold circuit 36 is V2, and the divider 37
Calculate (V1 /V2), and then calculate (V1 /V2)
) is closer to 0, the faster the music signal changes.

[0043] When a rapidly changing music signal is mixed with a large amount of early reflected sound, a double-strike feeling becomes noticeable, so more indirect sound and reverberant sound are mixed. Further, when (V1 /V2) approaches 1, it indicates that the change in the music signal is gradual, and in this case, it is difficult to understand the effect with just the reverberant sound, so a large amount of early reflected sound is mixed. Note that the delay circuit 31
It functions to add reverberation sound after setting the reverberation effect according to the speed of the loud signal.

[0044]

As described above, according to claim 1 of the present invention, the effect amount of the first, second, and third reverberation sound adding means can be adjusted according to the music signal through the parameter control means. By changing the mixing ratio with the direct sound and adding it with an adder, it is possible to add reverberation sound that matches the music source and produce a reverberation effect that does not feel strange.

Further, according to claim 4 of the present invention, the first
, by selecting one, two, or three of the second and third reverberant sound adding means and varying their effect sizes, a reverberation effect that matches the genre of the music source is exerted. It is possible to eliminate dependence on the music source, which can cause an unnatural feeling or make it difficult to understand the reverberation effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a reverberation device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of a reverberation device according to another embodiment of the invention.

FIG. 3 is a block diagram showing the configuration of a reverberation device according to still another embodiment of the present invention.

FIG. 4 is a block diagram showing the configuration of a reverberation device according to another embodiment of the present invention.

FIG. 5 is a block diagram showing the configuration of a conventional reverberation device.

FIG. 6 is a block diagram showing the configuration of another conventional reverberation device.

FIG. 7 is a block diagram showing the configuration of another conventional reverberation device.

FIG. 8 is a block diagram showing the configuration of another conventional reverberation device.

[Explanation of symbols]

1 Music reproducer 2 to 5 Switch 6 Parameter controller 7 Gain controller 8 Early reflection sound generator 9 Reverberation sound generator 10 Indirect sound generator 11 to 14 Amplifier 15 Adder 32, 35 Absolute value circuit 34, 36 Peak hold circuit 37 Dividers 38 to 41 Reverberation effect setting switch 42 Changeover switch 43 Surround system controller

Claims (6)

[Claims] 1. First reverberation sound adding means for inputting a stereo music signal to a plurality of delay circuits connected in parallel and attenuating or amplifying the output signal of the delay circuit; a second reverberation sound adding means that attenuates the output signal of the circuit and adds it to the input signal; and a third reverberation sound adding means that amplifies and delays the difference signal between the left channel and the right channel of the stereo music signal and adds it to the left channel and the right channel. a reverberant sound adding means, and a parameter control means for changing the effect amount of the first, second and third reverberant sound adding means;
A reverberation device characterized by comprising an adder that adds the reproduced music signal and the output signals of the first, second, and third reverberation sound adding means. 2. The parameter control means includes a parameter that increases the ratio of the effect amount of the first reverberation sound addition means, a parameter that increases the ratio of the effect amount of the second reverberation sound addition means, and a third parameter that increases the ratio of the effect amount of the second reverberation sound addition means. 2. The reverberation apparatus according to claim 1, wherein the reverberation apparatus is configured to change over a parameter for increasing the ratio of the effect amount of the reverberation sound adding means using a switch. 3. The parameter control means is configured to change the effect amount of the first, second and third reverberation sound adding means according to the speed of change of the music signal. reverberation device. 4. A first reverberation sound adding means that inputs a stereo music signal to a plurality of delay circuits connected in parallel and attenuates or amplifies the output signal of the delay circuit; and a first reverberation sound adding means that inputs the reproduced music signal to the delay circuit. a second reverberation sound adding means for attenuating the output signal of the delay circuit and adding it to the input signal; and a third means for amplifying and delaying the difference signal between the left and right channels of the stereo music signal and adding it to the left and right channels. reverberant sound adding means, an effect amount varying means for changing the effect amount of the first, second and third reverberant sound adding means, and the first, second and third reverberant sound adding means. One,
A reverberation device comprising: a reverberation sound method selection means for selecting two or three means; and an adder for adding an output signal of the selected reverberation sound addition means to a reproduced music signal. 5. The reverberation apparatus according to claim 4, wherein said reverberation sound method selection means is configured to be selectable by a switch from among the first, second and third reverberation sound addition means according to the music source. 6. The reverberation system according to claim 4, wherein the reverberation sound method selection means is configured to switch between the first, second and third reverberation sound adding means according to the speed of change of the music signal. Device.