JPH08272387A - Reverberation adding device - Google Patents

Abstract

PURPOSE: To provide a reverberation adding device easy for recognizing a setting mode and without being tired of listening by gradually attenuating it and making it the reference level when a prescribed time lapses after generating a reverberation sound with a level higher than a reference level beforehand set as the reverberation sound. CONSTITUTION: An input signal from an input terminal IN is supplied to a reverberation generation part 1 and an addition part 4. A reverberation signal from the reverberation generation part 1 is outputted to an output terminal OUT through the addition part 4 after the level is controlled by a variable gain amplifier part 3 varying the gain by a control signal G from a reverberation envelope control signal generation part 2. Here, the reverberation envelope control signal generation part 2 generates the control signal G so as to vary the level in a certain time. That is, when the reverberation sound is added, the level of the reverberation sound addition is made higher than usual for clearly making recognize a difference from a mode immediately before addition immediately after the reverberation sound addition, and the level is lowered with the time to be made the proper reference level.

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, and more particularly, it facilitates recognition of a reverberation mode when switching the degree (mode) of reverberation to be added directly to a sound in order to expand the acoustic space for hearing. The present invention relates to a reverberation adding device.

[0002]

2. Description of the Related Art For example, since an on-vehicle audio device is installed in a small indoor space, there is a limitation in the acoustic spatial expansion of the direct sound. Therefore, in order to remove this restriction and extend the spatial spread in the sense of hearing, a delay sound is artificially generated from a direct sound by using a delay device or the like, and a reverberant sound is added to the direct sound. , It gives an acoustic effect as if listening in a large hall.

[0003]

By the way, since the reflection mode of sound differs depending on the size of the car, the difference in the interior material, the size of the window, the material of the seat (fabric or genuine leather), the reverberation mode also differs. , The reverberation mode peculiar to each car is set.

Therefore, in the conventional reverberation adding apparatus, the reverberation level corresponding to the reverberation mode peculiar to each vehicle is set as a reference level, and the reverberation level of the level slightly increased so that the reverberation to be added can be recognized is fixed. It is configured so that it can be set to.

For example, when a church mode for obtaining acoustic spread in a church is set, a reverberation level that is heard as if listening to the church is added, but when the church mode is set, the reverberation level before the setting is set. The level of the additional reverberation sound is set high in order to noticeably recognize what kind of characteristics the reverberation sound is added to in comparison with the mode. However, in this case, since the set level is high, there is a problem that listening fatigue occurs if a high reverberation level is continuously added for a long time.

To avoid this problem, if the set reverberation addition level is lowered, the characteristics of the selected operation mode are not clarified, and the user has to repeatedly adjust the addition level, so that the user is required to adjust the addition level during driving. When the driver performs the above operation, there is a problem that driving danger increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reverberation adding device which makes it easy to recognize the setting mode and does not cause fatigue.

[0008]

In order to solve the above-mentioned problems, a reverberation adding device according to the present invention is a reverberation adding device which adds and outputs reverberation sound by a selection operation on a direct sound. In response to the reverberation sound, a reverberation sound having a level higher than a preset reference level is generated, then gradually attenuated, and is set to the reference level when a predetermined time elapses.

Here, the gradual attenuation of the reverberation level is
It can be linear damping or quadratic damping, and
After the reverberation level is set to the high level, the reverberation level is decreased to the reference level when the predetermined time has elapsed, and then the reference level and an intermediate level that is lower than the high level and higher than the reference level. It is also possible to cause the change to gradually increase or decrease at least once. The gradual increase and the gradual change are linear, quadratic, or sinusoidal.

Further, the reverberation adding device according to the present invention is a reverberation adding device for adding a reverberation sound by a selection operation to a direct sound and outputting the reverberation sound. , A gain control unit for generating a control signal for controlling a gain to be gradually attenuated according to a predetermined characteristic, and a gain variable in response to a control signal from the gain control unit and variably outputting the level of the reverberation sound signal. A variable gain amplifying means and an adding means for adding and outputting the generated sound signal and the output signal of the variable gain amplifying means are configured.

Here, the gain control unit first sets the level to a level higher than a reference level preset as a reverberation sound, and then lowers the level to the reference level when a predetermined time elapses, and then the reference level. And an intermediate level lower than the high level and higher than the reference level at least once.

The reverberation adding device is more effective when installed as an on-vehicle audio device.

[0013]

In the present invention, when the reverberation sound is added, immediately after the addition of the reverberation sound, the level of the addition of the reverberation sound is set higher than usual in order to clearly recognize the difference from the mode immediately before the addition of the reverberation sound. Is lowered to put the reverberation sound at the proper reference level.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a diagram showing a temporal change of a direct sound and a reverberation added sound level set in a reverberation addition device according to the present invention.

As shown in FIG. 1, when the reference reverberation added sound Z2 is gradually reduced after the direct sound D is generated, the higher level as shown in the figure is set to facilitate the perceptual recognition of the setting mode. The reverberation addition sound Z1 of the emphasis level that gradually changes in the emphasis level is made to match the basic reverberation addition sound level when the decay time length T has elapsed.

A case where an impulse sound as shown in FIG. 8A is input will be described. When the reverberation addition level is constant, that is, when the reverberation envelope control signal oscillating unit 2 (LFO: Low frequency oscillator) described later is constant, the reverberation generating unit described below applies to each impulse sound as shown in FIG. 8B. Reflected sounds of 30 ms, 60 ms, and 100 ms are added. Since the LFO is constant, each impulse response has the same shape.

On the other hand, when the mode switching switch of the reverberation adding apparatus of the present embodiment is turned on, the reverberation sound is added at a level higher than the reference level as shown in FIG.
As in (D), the impulse response has a large reverberation. In this embodiment, reverberation is added so that the original reference level is reached in 2 seconds as shown in FIG. 8C, so that the impulse response is gradually changed to the original reference level as shown in FIG. 1D. It takes the form of an impulse response.

Here, the state of attenuation of one pulse of FIG. 8B corresponds to Z2 of FIG. 1, and the second pulse of FIG. 8D (that is, also from the corresponding FIG. 8C). As can be seen, the state of attenuation at the enhancement level L1) is Z1 in FIG.
Equivalent to. The waveform of FIG. 3 corresponds to that of FIG.

FIG. 2 is a block diagram showing the configuration of an embodiment of the reverberation applying apparatus according to the present invention, which has an input terminal IN.
The input signal (signal corresponding to the direct sound) from is supplied to the reverberation generating unit 1 and the adding unit 4. The reverberation signal from the reverberation generating unit 1 is output through the adding unit 4 after its level is controlled by the variable gain amplifying unit 3 whose gain is changed by the control signal G from the reverberation envelope control signal generating unit 2. It is output to the terminal OUT. Here, the reverberation envelope control signal generation unit 2 generates the control signal G that changes the level at a certain time, as shown by the dotted line of the reverberation added sound Z1 at the emphasis level in FIG.

FIG. 3 shows an example of the temporal change of the emphasized reverberation added sound Z1. In this example, the gain designated by the control signal G from the reverberation envelope control signal generator 2 is set to a high value at the mode setting time t1 so that the setting mode as the reverberation addition characteristic can be sufficiently recognized aurally. Then, the gain of the variable gain amplifying unit 3 is raised above the reference level, and the reverberation signal from the reverberation generating unit 1 is set to a high level (for example, 12 dB from the reference level) L1, and then the control signal G is linearly gradually increased. The value is reduced to obtain a reference level L0 (a level higher than the reference reverberation level peculiar to the vehicle by a certain level) at a time t2 when a predetermined attenuation time T has elapsed. The level designated by the control signal G after time t2 is maintained at L0. Here, the decay time length T can be arbitrarily selected, but since it is intended to recognize the setting mode characteristic, it may be short, and for example, about 5 seconds can be selected.

FIG. 4 shows another example of level change of the emphasized reverberation added signal. In this example, the attenuation from the high level L1 of the emphasized reverberation added signal set at the mode switching time t1 is an example in which the attenuation is not a linear curve as in FIG. 3 but a quadratic curve. The time until matching, that is, the decay time T is set to, for example, 10 seconds.

FIG. 5 shows still another example of the emphasized reverberation added signal, which is set to a high level L1 at the time of mode switching t1 and is gradually reduced to the reference level L0 after the emphasizing operation, for example, by a time t11 when 5 seconds have elapsed. Then, for example, during 20 seconds, the level is gradually increased to a level L2 lower than L1 and higher than L0, and further gradually decreased (time t12), and thereafter, the level is periodically changed between L2 and L0. , This change is repeated. This gradual decrease or gradual increase change can be a linear or quadratic curve-like change characteristic as shown in FIG. 3 or 4. According to this example, the reverberant sound addition level that has been reduced to the reference level once is increased or decreased by the auditory perception, and is increased or decreased by the inclination of decrease, so that the listener cannot clearly recognize it, but before that, the additional sound becomes loud. The operations of forming and becoming smaller are repeated for a predetermined time. This repetition time can be set to, for example, about 20 seconds as described above. This is to prevent you from becoming accustomed to listening and forgetting the additional reverberation effect when you continue to listen in a certain level mode. When the level becomes L2, the listener must be in that mode. Can be recognized, and the mode can be recognized without any discomfort.

Time setting for the level gradually increasing / decreasing section in FIG. 5 is arbitrary, and in this example, the decreasing section T1 from the level L1 to the reference level L3 is 5 seconds, and the reference level L0 → L.
The interval T2, T3, ... Of 2 → L0 is set to 20 seconds, and the levels L1 and L2 are 12 dB and 6 dB higher than the level L0.
Each is set to a high level.

FIG. 6 shows another example of changes in the emphasized reverberation added level, in which the gradual increase and gradual change in FIG. 5 are set not as linear or quadratic curves but as sinusoidal changes.

As a merit of using a sine wave as described above, smoothness is obtained rather than a linear change, so that a sense of discomfort in hearing is reduced.

In the above-described embodiment, the time width of the gradually increasing or gradually decreasing section between the levels L0 and L2 can be set smaller with time.

In the above embodiment, the amplitude can be reduced with time to naturally return to the normal mode (a state in which the reverberation added level does not change temporally). At this time, the amplitude may be reduced while keeping the time width constant, but it is naturally difficult to recognize when the amplitude is reduced, but when the level is lowered by reducing the period as the amplitude decreases, Since the number of times of gradual increase and decrease of is increased, it is easy to recognize until the end.

FIG. 7 is a block diagram showing an example of the configuration of the reverberation generator 1 in FIG. 11 is input to N delays (for example, 30 m
s, 60 ms, 100 ms, 60 ms. 80 ms) output signals correspond to the corresponding amplifiers 12 (1), 12
, (12) are amplified by a predetermined gain in (2), 12 (3), 12 (4), ..., 12 (N), and are added and synthesized by the adder 12 and output as a reverberation signal.

If the reverberation sound is continuously added at the same level for a long time, the ears become accustomed to it, and the recognition that the reverberation sound is added in the reverberation mode is weakened. By increasing, the degree of recognition is increased, and the listener can appropriately recognize that the reverberation sound is added.

[0030]

As described above, according to the reverberation adding apparatus of the present invention, not only the setting mode can be easily recognized, but also a reverberation adding apparatus that does not cause fatigue of listening can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a temporal change of a direct sound and a reverberation added sound level set in a reverberation addition device according to the present invention.

FIG. 2 is a configuration block diagram of an embodiment of a reverberation adding device according to the present invention.

FIG. 3 is a diagram showing an example of a temporal change of the emphasized reverberation added sound Z1 in the embodiment of the present invention.

FIG. 4 is a diagram showing another example of the temporal change of the emphasized reverberation added sound Z1 in the embodiment of the present invention.

FIG. 5 is a diagram showing still another example of the temporal change of the emphasized reverberation added sound Z1 in the embodiment of the present invention.

FIG. 6 is a diagram showing still another example of the temporal change of the emphasized reverberation added sound Z1 in the embodiment of the present invention.

7 is a block diagram showing a configuration example of a reverberation generation unit 1 in FIG.

[Explanation of symbols]

 1 Reverberation generation unit 2 Envelope control signal generation unit 3 Variable gain amplifier 4 Adder

[Procedure amendment]

[Submission date] July 6, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a diagram showing a temporal change of a direct sound and a reverberation added sound level set in a reverberation added device according to the present invention.

FIG. 2 is a configuration block diagram of an embodiment of a reverberation adding device according to the present invention.

FIG. 3 is a diagram showing an example of a temporal change of the emphasized reverberation added sound Z1 in the embodiment of the present invention.

FIG. 4 is a diagram showing another example of the temporal change of the emphasized reverberation added sound Z1 in the embodiment of the present invention.

FIG. 5 is a diagram showing still another example of the temporal change of the emphasized reverberation added sound Z1 in the embodiment of the present invention.

FIG. 6 is a diagram showing still another example of the temporal change of the emphasized reverberation added sound Z1 in the embodiment of the present invention.

7 is a block diagram showing a configuration example of a reverberation generation unit 1 in FIG.

FIG. 8 is a diagram showing an impulse response when an impulse sound is input.

[Explanation of Codes] 1 Reverberation generation unit 2 Envelope control signal generation unit 3 Variable gain amplifier 4 Adder

Claims (8)

[Claims] 1. A reverberation adding device for adding a reverberation sound to a direct sound by a selection operation and outputting the reverberation sound, the level being higher than a reference level preset as the reverberation sound in response to the selection operation. A reverberation adding device characterized in that after generating a reverberant sound having the following, it is gradually attenuated and is set to the reference level when a predetermined time has elapsed. 2. The reverberation adding apparatus according to claim 1, wherein the gradual attenuation of the reverberation sound level is linear attenuation. 3. The reverberation adding apparatus according to claim 1, wherein the gradual attenuation of the reverberation sound level is a quadratic curve-like attenuation. 4. The reverberation sound level is lowered to the reference level when the predetermined time elapses after the reverberation sound level is set to the high level, and subsequently, the reference level is lower than the high level and lower than the reference level. The reverberation adding apparatus according to claim 1, wherein a change that gradually increases or decreases between the high intermediate level and the high intermediate level is performed at least once. 5. The reverberation applying apparatus according to claim 4, wherein the gradually increasing or gradually decreasing change is linear, quadratic or sinusoidal. 6. A reverberation adding device for adding and outputting a reverberation sound by a selection operation for a direct sound, a reverberation sound generating means for generating a reverberation sound signal for a direct sound signal, and a gradual attenuation according to a predetermined characteristic. A gain control unit for generating a control signal for controlling the gain, a variable gain amplifying unit for varying the gain corresponding to the control signal from the gain control unit, and for variably outputting the level of the reverberation sound signal; A reverberation adding device comprising: a sound signal and an adding means for adding and outputting the output signal of the variable gain amplifying means. 7. The gain control unit first sets a level higher than a reference level preset as a reverberant sound, and then reduces the level to the reference level when a predetermined time has elapsed,
7. The control signal according to claim 6, which subsequently generates a control signal that causes a change between the reference level and an intermediate level lower than the high level and higher than the reference level to increase or decrease at least once. Reverberation device. 8. The reverberation adding apparatus according to claim 1, wherein the reverberation adding apparatus is installed as an on-vehicle acoustic device.