KR102623719B1 - Vehicle type virtual engine sound system for modulation of amplitude without the amplifier - Google Patents

Abstract

The present invention is a vehicle virtual engine sound device that outputs a virtual engine sound through a speaker mounted on the vehicle while an eco-friendly vehicle such as a hybrid electric vehicle is driving or when the vehicle is stopped, and amplifies the sound source of the virtual engine sound. An apparatus and method for changing the sound pressure of a vehicle's virtual engine sound, which allows the sound pressure to be changed and output without any modification, are disclosed.
The disclosed vehicle virtual engine sound sound pressure changing device includes: a sound source storage unit storing a plurality of sound source data for virtual engine sounds; a control unit that reads one sound source data from the sound source storage unit and changes and adjusts sound pressure; A DA converter that converts the sound pressure-adjusted sound source data into an analog sound source signal; a sound source amplifier that receives the sound source signal; and a sound source output unit that outputs the sound source signal output from the sound source amplifier as an audible sound.
According to the present invention, detailed sound pressure amplification is possible for the vehicle's virtual engine sound, and there is an advantage in that it is easy to set the minimum and maximum sound pressure sections.

Description

Vehicle virtual engine sound pressure change device and method {Vehicle type virtual engine sound system for modulation of amplitude without the amplifier}

The present invention relates to an apparatus and method for changing the sound pressure of a virtual engine sound of a vehicle, and more specifically, to a device and method for changing the sound pressure of a virtual engine sound of a vehicle. More specifically, the present invention relates to a device for changing the sound pressure of a virtual engine sound of a vehicle, and more specifically, to a device for changing the sound pressure of a virtual engine sound of an eco-friendly vehicle such as a hybrid electric vehicle (Hybrid Electric Vehicle). Regarding a vehicle virtual engine sound device that outputs, the present invention relates to a vehicle virtual engine sound sound pressure change device and method that allows the sound source of the virtual engine sound to be output by changing the sound pressure without an amplifier.

In general, when eco-friendly vehicles such as electric vehicles are driven by motor power, the driving noise is very low, so there is a risk of safety accidents occurring because pedestrians around the vehicle may not be aware of the vehicle's approach.

In order to improve this problem, the Virtual Engine Sound System (VESS) is a system that reproduces and outputs virtual engine sounds to the outside of the vehicle through speakers so that pedestrians can easily recognize the approach of the vehicle. ) has been developed and is being installed in eco-friendly cars.

In this virtual engine sound system, when it is desired to change the sound pressure of the virtual engine sound, the sound pressure is set by amplifying it through an amplifier (AMP) having the characteristics as shown in FIG. 1. Figure 1 is a diagram showing step-by-step amplification graph characteristics of a general amplifier (AMP). In Figure 1, when applying AMP amplification with Vp-p of 14 V, if 3 V must be applied at 0 KM/H, the amplification is 6 times the initial value at 30 KM/H, resulting in 18 V amplification. Therefore, there is a problem in that noise is generated by using more than the allowable amount of the amplifier.

In other words, when outputting sound for a virtual engine sound, VESS is disadvantageous in setting sound pressures such as 0 KM/H to 30 KM/H due to the output for each stage (multiple) through the amplifier (AMP), as shown in FIG. , As a result, it is impossible to increase the sound pressure in detail, which has the problem of increasing the user's sense of heterogeneity.

Korean Patent Publication No. 10-2013-0142492 (publication date: 2013.12.30)

The purpose of the present invention to solve the above-described problems is to create a vehicle virtual engine sound that outputs a virtual engine sound through a speaker mounted on the vehicle while an eco-friendly vehicle such as a hybrid electric vehicle is driving or when the vehicle is stopped. The purpose of the present invention is to provide a device and method for changing the sound pressure of a virtual engine sound of a vehicle, which allows the device to change the sound pressure of the sound source of the virtual engine sound and output it without an amplifier.

In addition to the technical problems of the present invention mentioned above, other features and advantages of the present invention are described below, or can be clearly understood by those skilled in the art from such description and description.

An apparatus for changing the sound pressure of a virtual engine sound of a vehicle according to the present invention for achieving the above-described object includes: a sound source storage unit storing a plurality of sound source data for the virtual engine sound; a control unit that reads one sound source data from the sound source storage unit and changes and adjusts sound pressure; A DA converter that converts the sound pressure-adjusted sound source data into an analog sound source signal; a sound source amplifier that receives the sound source signal; and a sound source output unit that outputs the sound source signal output from the sound source amplifier as an audible sound.

In addition, the sound source data stored in the sound source storage unit is signed type data whose waveform is formed based on the zero level, which is the sound pressure reference level.

Additionally, a vehicle state detection unit for detecting each state of the vehicle; a vehicle state storage unit storing state information of the detected vehicle; and a selection switch for selecting a virtual engine sound output mode or selecting one sound source data from the sound source storage unit.

Additionally, the control unit may change and control the sound pressure by performing an increase/decrease operation on the sound source data according to a predefined ratio according to the vehicle speed detected through the vehicle state detector.

Additionally, the vehicle state detection unit may include a shift detection unit that detects a shift state of the vehicle; a vehicle speed detector that detects the driving speed of the vehicle; a mode detection unit that detects the electric vehicle mode of the vehicle; And it may include a ready detection unit for detecting a hybrid ready state of the vehicle.

In addition, the control unit changes the sound source data from a signed type in which the sound pressure reference level is zero (0) to an unsigned type in which the sound pressure reference level is not zero (0), thereby adjusting the sound pressure. It can be adjusted.

Additionally, the control unit may change and control sound pressure in units of 1% of the initial sound pressure level waveform for the sound source data.

Meanwhile, the method of changing the sound pressure of a virtual engine sound of a vehicle according to the present invention for achieving the above-described purpose is a method of changing the sound pressure of a virtual engine sound of a device of a device including a sound source storage unit in which a plurality of sound source data for virtual engine sounds is stored, ( a) selecting one sound source data among the plurality of sound source data according to a user's operation at a selection switch; (b) a control unit reading the selected sound source data from the sound source storage unit and changing and adjusting the sound pressure; (c) converting the sound source data with the sound pressure adjusted into an analog sound source signal in a DA converter; (d) receiving the sound source signal from a sound source amplifier; and (e) the sound source output unit outputting the sound source signal output from the sound source amplification unit as an audible sound.

Additionally, in step (b), the control unit may change and control the sound pressure by performing an increase/decrease operation on the sound source data according to a predefined ratio according to the vehicle speed detected through the vehicle state detector.

In addition, in step (b), the control unit changes the sound source data from a signed type in which the sound pressure reference level is zero (0) to an unsigned type in which the sound pressure reference level is not zero (0). You can adjust the sound pressure by changing the type.

Additionally, in step (b), the control unit may change and adjust the sound pressure in units of 1% of the initial sound pressure level waveform for the sound source data.

And, in step (b), the control unit determines the transmission state of the vehicle detected through the shift detector, the driving speed of the vehicle detected through the vehicle speed detector, and the electric vehicle mode detected through the mode detector with respect to the sound source data. , and the sound pressure can be changed and adjusted to match the set sound pressure level according to one of the hybrid ready states of the vehicle detected through the ready detection unit.

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

According to the present invention, it is possible to adjust the sound pressure of the VESS using DAC amplification rather than AMP amplification, and when outputting a virtual engine sound, the sound pressure level is changed in units of 1% of the initial waveform, making it possible to finely increase the sound pressure.

In addition, by changing the sound pressure level in units of 1% of the initial waveform, it becomes easier to set sound pressure such as 0 KM/H to 30 KM/H, thereby reducing the user's sense of heterogeneity.

The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. will be.

Figure 1 is a diagram showing step-by-step amplification graph characteristics of a general amplifier (AMP).
Figure 2 is a block diagram schematically showing the configuration of a vehicle virtual engine sound pressure change device according to an embodiment of the present invention.
Figure 3 is a diagram showing the waveform of sind-type sound source data according to an embodiment of the present invention.
Figure 4 is a diagram illustrating an example of increasing or decreasing sound source data at a rate defined according to vehicle speed according to an embodiment of the present invention.
Figure 5 is an operation flowchart for explaining a method of changing the vehicle virtual engine sound pressure according to an embodiment of the present invention.
Figure 6 is a diagram showing an example of changing the size of sound source data according to an embodiment of the present invention.
Figure 7 is a diagram showing an example of changing sound source data from Singned data to Unsigned data according to an embodiment of the present invention.
Figure 8 is a diagram showing an example of data on which sound pressure adjustment has been completed according to an embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The present invention may be implemented in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts that are not relevant to the description are omitted, and identical or similar components are assigned the same reference numerals throughout the specification.

Throughout the specification, when a part is said to be “connected” to another part, this includes not only cases where it is “directly connected,” but also cases where it is “electrically connected” with another element in between. . Additionally, when a part is said to “include” a certain component, this means that it may further include other components, rather than excluding other components, unless specifically stated to the contrary.

When a part is referred to as being “on” another part, it may be directly on top of the other part or it may be accompanied by another part in between. In contrast, when a part is said to be "directly above" another part, it does not entail any other parts in between.

Terms such as first, second, and third are used to describe, but are not limited to, various parts, components, regions, layers, and/or sections. These terms are used only to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, the first part, component, region, layer or section described below may be referred to as the second part, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is only intended to refer to specific embodiments and is not intended to limit the invention. As used herein, singular forms include plural forms unless phrases clearly indicate the contrary. As used in the specification, the meaning of "comprising" refers to specifying a particular characteristic, area, integer, step, operation, element and/or ingredient, and the presence or presence of another characteristic, area, integer, step, operation, element and/or ingredient. This does not exclude addition.

Terms indicating relative space, such as “below” and “above,” can be used to more easily describe the relationship of one part shown in the drawing to another part. These terms are intended to include other meanings or operations of the device in use along with the meaning intended in the drawings. For example, if the device in the drawings is turned over, some parts described as being “below” other parts will be described as being “above” other parts. Accordingly, the exemplary term “down” includes both upward and downward directions. The device may be rotated by 90 degrees or other angles, and terms indicating relative space are interpreted accordingly.

Although not defined differently, all terms including technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries are further interpreted as having meanings consistent with related technical literature and currently disclosed content, and are not interpreted in ideal or very formal meanings unless defined.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

Figure 2 is a block diagram schematically showing the configuration of a vehicle virtual engine sound pressure change device according to an embodiment of the present invention.

Referring to FIG. 2, the vehicle virtual engine sound pressure change device 100 according to the present invention includes a vehicle state detection unit 110, a vehicle state storage unit 120, a sound source storage unit 130, a selection switch 140, It includes a control unit 150, a digital to analog (DA) converter 160, a sound source amplifier 170, and a sound source output unit 180.

The vehicle state detection unit 110 detects each state, such as the vehicle's transmission state, driving speed, and vehicle mode. To this end, the vehicle state detection unit 110 includes a shift detection unit 112 that detects the shift state of the vehicle; A vehicle speed detector 114 that detects the driving speed of the vehicle; A mode detection unit 116 that detects the electric vehicle mode of the vehicle; And it may include a ready detection unit 118 for detecting the hybrid ready state of the vehicle.

The vehicle state storage unit 120 stores state information of the detected vehicle.

The sound source storage unit 130 stores a plurality of sound source data for virtual engine sounds. At this time, the plurality of sound source data stored in the sound source storage unit 130 is signed type data in which a waveform is formed based on the zero level, which is the sound pressure reference level, as shown in FIG. 3. Figure 3 is a diagram showing the waveform of sind-type sound source data according to an embodiment of the present invention.

The selection switch 140 can be used to select a virtual engine sound output mode or to select one sound source data from the sound source storage unit 130.

The control unit 150 can read one sound source data from the sound source storage unit 130 and change and control the sound pressure.

In addition, the control unit 150 may change and control the sound pressure by performing an increase/decrease operation according to a predefined ratio as shown in FIG. 4 according to the vehicle speed detected through the vehicle state detection unit 110 on the sound source data. Figure 4 is a diagram illustrating an example of increasing or decreasing sound source data at a rate defined according to vehicle speed according to an embodiment of the present invention.

In addition, the control unit 150 changes the sound source data from a signed type in which the sound pressure reference level is zero (0) to an unsigned type in which the sound pressure reference level is not zero (0), thereby increasing the sound pressure. can be adjusted.

In addition, the control unit 150 can change and adjust the sound pressure in units of 1% of the initial sound pressure level waveform for the sound source data.

The DA converter 160 converts sound source data with adjusted sound pressure into an analog sound source signal.

The sound source amplifier 170 receives the sound source signal output from the DA converter 160.

The sound source output unit 180 may output the sound source signal output from the sound source amplifier 170 as an audible sound.

Figure 5 is an operation flowchart for explaining a method of changing the vehicle virtual engine sound pressure according to an embodiment of the present invention.

Referring to FIG. 5, in the vehicle virtual engine sound pressure change device 100 according to the present invention, the selection switch 140 selects one sound source data among a plurality of sound source data according to the user's operation (S510).

At this time, before selecting one sound source data, the selection switch 140 selects and inputs the virtual engine sound output mode of the VESS according to the operation of the user (driver), and the VESS enters the virtual engine sound output mode to generate a plurality of sound source data. When displaying sound source data, one sound source data is selected and input according to the user's selection action.

Here, one sound source data selected by the selection switch 140 is a ripple with alternating positive (+) amplitude and negative (-) amplitude based on the sound pressure reference level zero (0), as shown in FIG. 3. It has a shape.

Next, the control unit 150 reads the selected sound source data from the sound source storage unit 130 and changes and adjusts the sound pressure (S520).

That is, the control unit 150 changes the sound pressure by performing an increase/decrease operation on the sound source data according to a predefined ratio according to the vehicle speed detected through the vehicle state detector 110, as shown in FIG. 4, for example. Adjust.

In addition, with respect to the sound source data, the control unit 150, in addition to the above-described vehicle speed, determines the transmission status of the vehicle detected through the shift detection unit, the electric vehicle mode detected through the mode detection unit, and the hybrid ready status of the vehicle detected through the ready detection unit. Depending on one of the (Hybrid Ready) states, the sound pressure can be changed and adjusted to match the set sound pressure level.

Additionally, the control unit 150 can change and adjust the size of the sound source data as shown in FIG. 6. Figure 6 is a diagram showing an example of changing the size of sound source data according to an embodiment of the present invention. As shown in FIG. 6, the control unit 150 can change 16-bit PCM sound source data into 12-bit sound source data and adjust it.

In addition, the control unit 150 changes the sound source data from a signed type in which the sound pressure reference level is zero (0) to an unsigned type in which the sound pressure reference level is not zero (0), as shown in FIG. 7. You can adjust the sound pressure by changing it to (Unsigned type). Figure 7 is a diagram showing an example of changing sound source data from Singned data to Unsigned data according to an embodiment of the present invention.

In addition, the control unit 150 can change and adjust the sound pressure in units of 1% of the initial sound pressure level waveform for the sound source data. For example, if the initial sound pressure level is 3V, the sound pressure level is changed and adjusted in increments of 0.03V, which is equivalent to 1%.

Accordingly, the control unit 150 adjusts the sound pressure level of the sound source data as described above and outputs sound source data whose sound pressure has been adjusted as shown in FIG. 8 to the DA converter 160. Figure 8 is a diagram showing an example of data on which sound pressure adjustment has been completed according to an embodiment of the present invention. As shown in Figure 8, it can be seen that the sound pressure reference level has been adjusted and changed from the zero (0) V level to the 1.65 V level.

Next, the DA converter 160 converts the sound source data with the sound pressure adjusted into an analog sound source signal (S530).

That is, the DA converter 160 outputs a sound source signal with adjusted sound pressure to the sound source amplifier 170.

Next, the sound source amplifier 170 receives the sound source signal received from the DA converter 160 (S540).

At this time, the sound source amplification unit 170 amplifies the received sound source signal to a certain size according to the user's selection, or outputs it as is without amplification to the sound source output unit 180.

Next, the sound source output unit 180 outputs the sound source signal output from the sound source amplifier 170 as audible sound through a speaker (S550).

Therefore, the vehicle virtual engine sound pressure change device 100 according to the present invention is capable of detailed sound pressure amplification through DAC amplification rather than AMP amplification, and it is easy to set the minimum sound pressure section and the maximum sound pressure section.

As described above, according to the present invention, a vehicle virtual engine sound device that outputs a virtual engine sound through a speaker mounted on the vehicle while an eco-friendly vehicle such as a hybrid electric vehicle is driving or when the vehicle is stopped, A device and method for changing the sound pressure of a virtual engine sound of a vehicle can be implemented, which allows the sound pressure of the sound source of the virtual engine sound to be changed and output without an amplifier.

Those skilled in the art to which the present invention pertains should understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features, and that the embodiments described above are illustrative in all respects and not restrictive. Just do it. The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: Vehicle virtual engine sound pressure change device
110: Vehicle status detection unit
120: Vehicle status storage unit
130: sound source storage unit
140: selection switch
150: control unit
160: DA converter
170: Sound source amplification unit
180: sound source output unit

Claims (12)

A sound source storage unit storing a plurality of sound source data for virtual engine sounds;
a control unit that reads one sound source data from the sound source storage unit and changes and adjusts sound pressure;
A DA converter that converts the sound pressure-adjusted sound source data into an analog sound source signal;
a sound source amplifier that receives the sound source signal; and
a sound source output unit that outputs the sound source signal output from the sound source amplifier as an audible sound;
Including,
The control unit,
A vehicle virtual engine sound that adjusts the sound pressure by changing the sound source data from a signed type with a sound pressure reference level of zero (0) to an unsigned type with a sound pressure reference level other than zero (0). Sound pressure change device.
According to claim 1,
The sound source data stored in the sound source storage unit is signed type data in which a waveform is formed based on the zero level, which is a sound pressure reference level.
According to claim 1,
a vehicle state detection unit for detecting each state of the vehicle;
a vehicle state storage unit storing state information of the detected vehicle; and
a selection switch for selecting a virtual engine sound output mode or selecting one sound source data from the sound source storage unit;
A vehicle virtual engine sound pressure change device further comprising:
According to claim 1,
The control unit performs an increase/decrease calculation on the sound source data according to a predefined ratio according to the vehicle speed of the vehicle, and then changes the sound pressure reference level to zero in a signed type with a sound pressure reference level of zero (0). A vehicle virtual engine sound sound pressure change device that changes and adjusts the sound pressure to an unsigned type instead of (0).
According to claim 3,
The vehicle condition detection unit,
a shift detection unit that detects a shift state of the vehicle;
a vehicle speed detector that detects the driving speed of the vehicle;
a mode detection unit that detects the electric vehicle mode of the vehicle; and
A vehicle virtual engine sound pressure change device comprising a ready detection unit for detecting a hybrid ready state of the vehicle.
According to claim 1,
The control unit changes the size of the sound source data after performing an increase/decrease operation on the sound source data at a predefined rate according to the vehicle speed, and sets the sound pressure reference level to zero (0) for the changed sound source data. A vehicle virtual engine sound sound pressure change device that adjusts the sound pressure by changing the sound pressure standard level from the signed type to the unsigned type instead of zero.
According to claim 1,
The control unit is a vehicle virtual engine sound sound pressure change device that changes and adjusts sound pressure in units of 1% of the initial sound pressure level waveform for the sound source data.
A method of changing the sound pressure of a vehicle virtual engine sound in a device including a sound source storage unit storing a plurality of sound source data for virtual engine sounds, comprising:
(a) selecting one sound source data among the plurality of sound source data according to a user's operation at a selection switch;
(b) a control unit reading the selected sound source data from the sound source storage unit and changing and adjusting the sound pressure;
(c) converting the sound source data with the sound pressure adjusted into an analog sound source signal in a DA converter;
(d) receiving the sound source signal from a sound source amplifier; and
(e) a sound source output unit outputting the sound source signal output from the sound source amplifier as an audible sound;
Including,
In step (b), the control unit,
A vehicle virtual engine that adjusts sound pressure by changing the sound source data from a signed type with a sound pressure reference level of zero (0) to an unsigned type with a sound pressure reference level other than zero (0). How to change sound pressure.
According to claim 8,
In step (b), the control unit performs an increase/decrease operation on the sound source data at a predefined rate according to the vehicle speed, and then performs a signed type with a sound pressure reference level of zero (0). A method of changing the sound pressure of a vehicle's virtual engine sound by changing and controlling the sound pressure to an unsigned type where the sound pressure reference level is not zero (0).
According to claim 8,
In step (b), the control unit changes the size of the sound source data after performing an increase/decrease operation on the sound source data at a predefined rate according to the vehicle speed, and sets a sound pressure standard for the changed sound source data. A method of changing the sound pressure of a vehicle's virtual engine sound by changing the sound pressure from a signed type with a level of zero (0) to an unsigned type with a sound pressure reference level other than zero (0).
According to claim 8,
In step (b), the control unit changes and adjusts the sound pressure in units of 1% of the initial sound pressure level waveform for the sound source data.
According to claim 8,
In step (b), the control unit determines, for the sound source data, the shift state of the vehicle detected through the shift detector, the driving speed of the vehicle detected through the vehicle speed detector, the electric vehicle mode detected through the mode detector, and A method of changing the sound pressure of a vehicle's virtual engine sound, which changes and adjusts the sound pressure to match the sound pressure level set according to one of the vehicle's Hybrid Ready states detected through the ready detection unit.

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