WO2019061595A1

WO2019061595A1 - Intelligent acceleration and sound effect control system of electric vehicle

Info

Publication number: WO2019061595A1
Application number: PCT/CN2017/107040
Authority: WO
Inventors: 庄子平
Original assignee: 庄子平
Priority date: 2017-09-29
Filing date: 2017-10-20
Publication date: 2019-04-04
Also published as: CN107697000A; DE112017001377T5; DE112017001377B4; CN107697000B

Abstract

An intelligent acceleration and sound effect control system of an electric vehicle. The system comprises a main control unit (5), wherein the main control unit (5) is connected to an acceleration operation apparatus (2); under each control mode of the main control unit (5), an acceleration characteristic and an engine sound of an electric vehicle (7) respectively simulate an acceleration characteristic and an engine sound of a supercar; the main control unit (5) is further respectively connected to a control panel (1) and a sound generation apparatus (4); and the main control unit (5) receives control mode selection information, receives acceleration information, then controls the electric vehicle (7) to accelerate with a matching acceleration characteristic, and controls the sound generation apparatus (4) to generate a matching engine sound. An acceleration characteristic and an engine sound effect of various supercars are simulated by means of artificial intelligence, so that a pedestrian can be reminded to be aware of a vehicle in time so as to take care, and a high-order electric vehicle has better driving pleasure and improved market attractiveness.

Description

Intelligent acceleration and sound effect control system for electric vehicles

Technical field

The invention relates to the field of electric vehicles, and in particular relates to an intelligent acceleration and sound effect control system for an electric vehicle.

Background technique

Electric vehicles are gradually becoming the mainstream of the future, with the advantages of large torque, fast acceleration, small sound, and environmental protection. At present, the performance of electric vehicles is getting better and better. Some high-end electric vehicles (such as Tesla) start from static to 100Km/h. In less than 3 seconds, this acceleration performance is comparable to the current super-running on the market, which is very superior to the driver. See Figure 1 for the acceleration of the electric car Tesla. The curve, the acceleration characteristics of the electric vehicle is adjusted at the factory, fixed, single, and quiet and silent. On the one hand, when passing by passers-by, passers-by can not detect and is less safe. On the other hand, when there is less acceleration, people The bloody spurs and the rumbling engine sounded a big discount on driving pleasure.

Summary of the invention

The object of the present invention is to provide an intelligent acceleration and sound effect control system for an electric vehicle, which uses artificial intelligence to simulate the acceleration characteristics of various super-runs and the sound effect of the engine. On the one hand, it can remind passers-by to find a car and pay attention to safety in time. Make high-end electric cars more fun to drive and increase market appeal.

In order to achieve the above object, the technical solution adopted by the present invention is: an intelligent acceleration and sound effect control system for an electric vehicle, comprising a main control unit, and an input operation end of the main control unit is connected with an acceleration operation device for acquiring driver acceleration information. ,

Wherein, the control mode of the main control unit is set to at least one, and in each control mode, the acceleration characteristics of the electric vehicle and the engine sound respectively simulate an acceleration characteristic of an super run and an engine sound;

The input end and the output end of the main control unit are also respectively connected with a control panel for acquiring driver control mode selection information and a sounding device for emitting an engine sound;

Receiving the acceleration after receiving the control mode selection information of the control panel by the main control unit The acceleration information of the operating device is then controlled to control the electric vehicle to accelerate with the matched acceleration characteristics and control the sounding device to emit a matching engine sound according to the corresponding control mode.

In the above, the acceleration characteristic of the electric vehicle refers to the relationship between the speed range of the electric vehicle and the acceleration time, and the engine sound of the electric vehicle refers to the engine sound corresponding to any one of the vehicle speeds, and in each control mode, the electric vehicle is Any one of the vehicle speed ranges corresponds to one acceleration time, and each vehicle speed corresponds to one engine sound, and the acceleration time and the engine sound respectively simulate an engine speed that exceeds the acceleration time of the same vehicle speed range and the same vehicle speed, and the purpose is In order to simulate the acceleration characteristics of various super-runs, the acceleration characteristic curve of the electric vehicle is simulated to simulate the acceleration characteristic curve of the super-running.

In the above technical solution, the database of the main control unit stores at least one set of acceleration characteristic parameters and at least one set of engine sounds. In each control mode, the main control unit invokes one set of the acceleration characteristic parameters and A set of the engine sounds. That is, the database (which stores at least one set of acceleration characteristic parameters and at least one set of engine sounds) is integrated into the main control unit. Of course, as a variant, the database can also be integrated into other units or set separately. This is easily done by those skilled in the art.

In the above technical solution, the control mode of the main control unit is set to one or more of an A mode, a B mode, an F mode, an L mode, an M mode, and a P mode, and the A mode simulated super running brand is Aston Martin ASTONMARTIN, the B-mode simulated super-run brand is BMW BMW, the F-mode simulated super-run brand is Ferrari Ferrari, the L-mode simulated super-run brand is Lamborghini Lamborghini, the M mode The simulated super-run brand is Maserati MASERATI, and the P-mode simulated super-run brand is Porsche PORSCHE. According to the above principle, the control mode of the main control unit can also be set to simulate the control mode of other super-running brands, and the number of control modes can be one or more.

There are three ways to change the maximum speed of an electric vehicle: (1) changing the current/voltage of the power supply into the motor; (2) changing the transmission ratio of the transmission for the electric vehicle in which the transmission is set; (3) setting the transmission for the transmission. Electric vehicle, changing the current/voltage of the power supply into the motor to change the transmission of the gearbox Dynamic ratio.

In the above technical solution, the electric vehicle includes an electric motor, the electric motor is provided with a plurality of rotational speed gear positions, and the main control unit controls the electric motor to start with a low speed gear position and continuously switch the speed gear position to control the acceleration mode. The electric vehicle accelerates with matching acceleration characteristics. By changing the current/voltage of the power supply to the motor from small to large, the maximum speed of the electric vehicle is continuously increased, so that the acceleration characteristic curve of the electric vehicle simulates the acceleration characteristic curve of the super running.

In the above technical solution, the electric vehicle includes an electric motor and a gearbox, the gearbox is provided with a plurality of gear ratio gear positions, and the main control unit controls the gearbox to start with a low gear ratio gear and continuously switch the gear ratio. The acceleration mode of the gears controls the electric vehicle to accelerate with matching acceleration characteristics. By continuously changing the transmission ratio of the gearbox from small to large, the maximum speed of the electric vehicle is continuously increased, so that the acceleration characteristic curve of the electric vehicle simulates the acceleration characteristic curve of the super-running.

In the above technical solution, the electric vehicle includes an electric motor and a gearbox, the electric motor is provided with a plurality of rotating gear positions, the gearbox is provided with a plurality of gear ratio gear positions, and the main control unit controls the electric motor to adopt low The speed gear starts and continuously switches the speed mode of the speed gear and controls the gearbox to start with a low gear ratio gear and continuously switches the gear ratio to accelerate the electric vehicle to accelerate with the matched acceleration characteristics. By changing the current/voltage of the power supply to the motor from small to large and changing the transmission ratio of the transmission from small to large, the maximum speed of the electric vehicle is continuously increased, so that the acceleration characteristic curve of the electric vehicle simulates the acceleration of the super-running. Characteristic curve.

In the above technical solution, the electric vehicle includes an electric motor and a gearbox, the electric motor is provided with a plurality of rotating gear positions, the gearbox is provided with a plurality of gear ratio gear positions, and the main control unit controls the electric motor to adopt high The speed gear starts and continuously switches the speed mode of the speed gear and controls the gearbox to start with a low gear ratio gear and continuously switches the gear ratio to accelerate the electric vehicle to accelerate with the matched acceleration characteristics. By changing the current/voltage of the power supply to the motor and changing the transmission ratio of the transmission from small to large, the maximum speed of the electric vehicle is continuously increased, so that the acceleration characteristic curve of the electric vehicle simulates the acceleration of the super-running. Characteristic curve.

In the above technical solution, the electric vehicle includes an electric motor and a gearbox, the engine is provided with a plurality of rotating gear positions, the gearbox is provided with a plurality of gear ratio gear positions, and the main control unit controls the electric motor to adopt low The speed gear starts and continuously switches the speed mode of the speed gear and controls the gearbox to start with a high gear ratio gear and continuously switches the gear ratio of the gear ratio to control the electric vehicle to accelerate with the matched acceleration characteristics. By changing the current/voltage of the power supply to the motor from small to large and changing the transmission ratio of the transmission from large to small, the maximum speed of the electric vehicle continuously increases, so that the acceleration characteristic curve of the electric vehicle simulates the acceleration of the super-running. Characteristic curve.

In the above technical solution, each set of the engine sounds produces a continuous range of engine running sounds by synthesizing engine speech samples at typical vehicle speeds.

In the above technical solution, the acceleration operating device is an accelerator pedal, and the accelerator pedal is provided with an angle sensor that detects an angular position signal of the accelerator pedal and converts the angular position signal into an electrical acceleration signal.

In the above technical solution, the control panel is provided with at least one button and a button recognition circuit that are in one-to-one correspondence with the control mode, and the button recognition circuit recognizes the pressed button and converts it into an electrical control mode selection signal.

In the above technical solution, the sounding device is a speaker.

In the above technical solution, the motor is provided with a motor controller that controls energy flowing to the motor, and the sounding device is provided with a sounding device controller that controls an engine sound output to the sounding device, the motor controller and the The sounding device controller is integrated in the main control unit.

In the above technical solution, the motor is provided with a motor controller for controlling the motor speed position, and the sounding device is provided with a sounding device controller for controlling an engine sound output to the sounding device, and the gearbox is provided with a control station. A gearbox controller of a transmission ratio gear of the transmission, the motor controller, the sounding device controller and the transmission controller are integrated in the main control unit.

Due to the above technical solutions, the present invention has the following advantages over the prior art:

The intelligent acceleration and sound effect control system of the electric vehicle disclosed by the invention fully utilizes the advantages of the good acceleration characteristics of the electric vehicle to meet the acceleration characteristic requirement of the super-run, and pre-stores the super-run acceleration characteristic parameter and the engine sound based on the database, and controls The panel selects the control mode to select the corresponding acceleration characteristics and the engine sound. The driver can step on the throttle to generate specific acceleration characteristics and sound effects. On the one hand, the passerby can be reminded to find the car in time and pay attention to safety. On the other hand, the high-order electric vehicle is used. More driving pleasure and increase market appeal.

DRAWINGS

1 is an acceleration profile of an electric vehicle (Tesla) in the prior art.

2 is a block diagram showing the composition of an intelligent acceleration and sound effect control system for an electric vehicle according to the first embodiment of the present invention.

3 is a velocity curve of an electric vehicle (simulated Ferrari) disclosed in the present invention.

4 is a block diagram showing the composition of an intelligent acceleration and sound effect control system for an electric vehicle according to Embodiment 2 of the present invention.

Figure 5 is a velocity diagram of an electric vehicle (analog Maserati) disclosed in the present invention.

Among them: 1, control panel; 2, acceleration operation device; 3, motor; 4, sound device; 5, the main control unit; 51, motor controller; 52, sound device controller; 53, gearbox controller; Power; 7, electric car; 8, gearbox.

Detailed ways

The present invention is further described in conjunction with the accompanying drawings and embodiments:

Embodiment 1

Referring to FIG. 2, as shown in the legend, an intelligent acceleration and sound effect control system for an electric vehicle includes:

a control panel 1 for obtaining driver control mode selection information;

- an acceleration operating device 2 for obtaining driver acceleration information;

- an electric motor 3 for providing a driving force, which is provided with a plurality of rotational speed positions;

- Sounding device 4 for emitting engine sound

a main control unit 5 comprising a database 51, a motor controller 52 and a sounding device controller 53, wherein the database 51 stores at least one set of acceleration characteristic parameters and at least one set of engine sounds, each set of said engine sounds being through a typical vehicle speed The synthesis of the underlying engine speech samples produces a continuous range of engine operating sounds;

- a power source 6 for providing energy;

Wherein, the control panel 1 and the acceleration operating device 2 are connected to the input end of the main control unit 5, the engine 3 and the sounding device 4 are connected to the output end of the main control unit 5, and the motor controller 52 controls the energy of the power source 6 flowing to the motor 3, and sounds The device controller 53 controls the engine sound output to the sounding device 4;

The control mode of the main control unit 5 is set to at least one. In each control mode, the main control unit 5 calls one of the acceleration characteristic parameters and one of the engine sounds, and the acceleration characteristics of the electric vehicle 7 and the engine sound are respectively simulated. An acceleration characteristic of super-running and engine sound;

After receiving the control mode selection information of the control panel 1, the main control unit 5 receives the acceleration information of the acceleration operation device 2, and then controls the electric motor 3 to start with a low-speed gear position and continuously switch the speed gear to accelerate the electric motor according to the corresponding control mode. The vehicle accelerates with matching acceleration characteristics and controls the sounding device 4 to emit a matching engine sound in accordance with the corresponding control mode.

In one embodiment, the control mode of the main control unit 5 is set to A mode, B mode, F mode, L mode, M mode, and P mode, and the A mode simulated super running brand is Aston Martin ASTONMARTIN, B mode. The simulated super-running brand is BMW BMW, the F-model simulated super-running brand is Ferrari Ferrari, the L-mode simulated super-running brand is Lamborghini Lamborghini, the M-mode simulated super-running brand is Maserati MASERATI, and the P-mode simulated super-running brand is Porsche PORSCHE.

In one embodiment, the acceleration operating device 2 is an accelerator pedal, the accelerator pedal is provided with an angle sensor, and the angle sensor detects an angular position signal of the accelerator pedal and converts the angular position signal into an electrical property. Accelerate the signal.

In one embodiment, the control panel 1 is provided with six buttons and a button recognition circuit corresponding to the control mode one by one, and the button recognition circuit recognizes the pressed button and converts it into an electrical control mode selection signal.

In one embodiment, the sounding device 4 is a speaker.

The operation of the intelligent acceleration and sound effect control system of the above electric vehicle in the present embodiment will be described below.

1) The driver selects the control mode to F mode through the control panel 1;

2) The driver accelerates by accelerating the operating device 2;

3) The main control unit 5 receives the control mode selection information and the acceleration information, and controls the electric motor 3 to start with the low speed position and continuously switch the speed gear according to the corresponding control mode to control the electric vehicle to accelerate with the matched acceleration characteristics. And controlling the sounding device 4 to issue a matching engine sound in accordance with the corresponding control mode.

Figure 3 is a velocity curve obtained by performing an accelerated test on an electric vehicle, which is the same as the acceleration curve of the Ferrari supercar.

Embodiment 2

Referring to FIG. 4, as shown in the legend, an intelligent acceleration and sound effect control system for an electric vehicle includes:

a control panel 1 for obtaining driver control mode selection information;

- an electric motor 3 for providing a driving force;

a sounding device 4 for emitting an engine sound;

a main control unit 5 comprising a database 51, a motor controller 52, a sounding device controller 53, and a gearbox controller 54 having at least one set of acceleration characteristic parameters and at least one set of engine sounds stored in the database 51, each set of said Engine sound is produced by synthesizing engine voice samples at typical vehicle speeds Produce a sound of engine operation in a continuous range;

- a power source 6 for providing energy;

a gearbox 8 for changing a gear ratio, which is provided with a plurality of gear ratio gear positions;

Wherein, the control panel 1 and the acceleration operating device 2 are connected to the input end of the main control unit 5, the engine 3 and the sounding device 4 are connected to the output end of the main control unit 5, and the motor controller 52 controls the energy of the power source 6 flowing to the motor 3, and sounds The device controller 53 controls the engine sound output to the sounding device 4, and the transmission controller 54 controls the gear ratio gear of the transmission 8;

The control mode of the main control unit 5 is set to at least one. In each control mode, the main control unit 5 invokes one set of acceleration characteristic parameters and one set of engine sounds, and the acceleration characteristics of the electric vehicle 7 and the engine sound simulate a super Acceleration characteristics of running and engine sounds;

After receiving the control mode selection information of the control panel 1, the main control unit 5 receives the acceleration information of the acceleration operation device 2, and then controls the transmission 8 to start with the low transmission ratio gear and continuously switches the acceleration of the transmission ratio gear according to the corresponding control mode. The mode controls the electric vehicle to accelerate with the matched acceleration characteristics and controls the sounding device 4 to emit a matching engine sound according to the corresponding control mode.

In one embodiment, the control mode of the main control unit 30 is set to one of the A mode, the B mode, the F mode, the L mode, the M mode, and the P mode, and the A mode simulated super running brand is Aston Martin. ASTONMARTIN, B mode simulation of the super-run brand for BMW BMW, F-mode simulation of the super-run brand for Ferrari Ferrari, L-mode simulation of the super-run brand for Lamborghini Lamborghini, M-mode simulation of the super-run brand for Maserati MASERATI, P-mode simulation The super running brand is Porsche PORSCHE.

In one embodiment, the acceleration operating device 2 is an accelerator pedal, and the accelerator pedal is provided with an angle sensor that detects an angular position signal of the accelerator pedal and converts the angular position signal into an electrical acceleration signal.

In one embodiment, the control panel 1 is provided with six buttons and a button recognition circuit corresponding to the control mode, and the button recognition circuit recognizes the pressed button and converts it into an electrical control mode. Select the signal.

In one embodiment, the sounding device 4 is a speaker.

1) The driver selects the control mode through the control panel 1 and selects the M mode;

2) The driver accelerates by accelerating the operating device 2;

3) The main control unit 4 receives the control mode selection information and the acceleration information, and controls the gearbox 8 to start with the low gear ratio gear and continuously switch the gear ratio of the gear ratio according to the corresponding control mode to control the electric vehicle to match the acceleration characteristics. Acceleration is performed and the sounding device 4 is controlled to emit a matching engine sound in accordance with the corresponding control mode.

Figure 5 is an acceleration curve obtained by performing an accelerated test on an electric vehicle, which is the same as the acceleration curve of the Ferrari super run.

Embodiment 3

The rest is the same as the second embodiment. The difference is that the motor is provided with multiple speed gear positions. The main control unit controls the motor to start with a low speed gear and continuously switch the speed gear according to the corresponding control mode and vehicle speed range. And the control gearbox adopts a low gear ratio gear starting position and continuously switches the gear ratio gear acceleration mode to control the electric vehicle to accelerate with matching acceleration characteristics.

1) The driver selects the control mode through the control panel;

2) The driver accelerates by accelerating the operating device;

3) The main control unit receives the control mode selection information and the acceleration information, controls the motor to start with the low speed gear position and continuously switches the speed gear position according to the corresponding control mode and the vehicle speed range, and controls the gearbox to adopt the low gear ratio gear position. Start and continuously switch the gear ratio acceleration mode to control the electric vehicle to accelerate with matching acceleration characteristics and control according to the corresponding control mode and vehicle speed The sounding device emits a matching engine sound.

Embodiment 4

The rest is the same as the second embodiment. The difference is that the motor is provided with multiple speed gear positions. The main control unit controls the motor to start at a high speed gear position and continuously switch the speed gear position according to the corresponding control mode and vehicle speed range. And the control gearbox adopts a low gear ratio gear starting position and continuously switches the gear ratio gear acceleration mode to control the electric vehicle to accelerate with matching acceleration characteristics.

1) The driver selects the control mode through the control panel;

2) The driver accelerates by accelerating the operating device;

3) The main control unit receives the control mode selection information and the acceleration information, controls the motor to start with the high speed gear position and continuously switches the speed gear position according to the corresponding control mode and the vehicle speed range, and controls the gearbox to adopt the low gear ratio gear position. The acceleration mode of starting and continuously switching the gear ratio gears controls the electric vehicle to accelerate with the matching acceleration characteristics and controls the sounding device to emit a matching engine sound according to the corresponding control mode and the vehicle speed.

Embodiment 5

The rest is the same as the second embodiment. The difference is that the motor is provided with multiple speed gear positions. The main control unit controls the motor to start with a low speed gear and continuously switch the speed gear according to the corresponding control mode and vehicle speed range. And the control gearbox adopts a high gear ratio gear starting position and continuously switches the gear ratio gear speed reduction mode to control the electric vehicle to accelerate with matching acceleration characteristics.

1) The driver selects the control mode through the control panel;

2) The driver accelerates by accelerating the operating device;

3) The main control unit receives the control mode selection information and the acceleration information according to the corresponding control mode. And the vehicle speed range control motor adopts a low-speed gear starting position and continuously switches the speed gear acceleration mode and controls the gearbox to adopt a high gear ratio gear starting position and continuously switches the gear ratio gear speed to control the electric vehicle to match the acceleration characteristics. Acceleration and control of the sounding device to produce a matching engine sound in accordance with the corresponding control mode and vehicle speed.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

An intelligent acceleration and sound effect control system for an electric vehicle includes a main control unit (5), and an input operation end of the main control unit (5) is connected with an acceleration operation device (2) for acquiring driver acceleration information,

It is characterized in that the control mode of the main control unit (5) is set to at least one, and in each control mode, the acceleration characteristics of the electric vehicle (7) and the engine sound simulate an acceleration characteristic and engine of the super-running sound;

The input end and the output end of the main control unit (5) are also respectively connected with a control panel (1) for acquiring driver control mode selection information and a sounding device (4) for emitting engine sound;

The main control unit (5) receives the control mode selection information of the control panel (1), receives the acceleration information of the acceleration operation device (2), and then controls the electric vehicle (7) according to the corresponding control mode. Acceleration and control of the sounding device (4) with matching acceleration characteristics to produce a matching engine sound.
The intelligent acceleration and sound effect control system for an electric vehicle according to claim 1, wherein the database of the main control unit (5) stores at least one set of acceleration characteristic parameters and at least one set of engine sounds, each control In the mode, the main control unit (5) calls one of the set of acceleration characteristic parameters and one of the set of the engine sounds.
The intelligent acceleration and sound effect control system for an electric vehicle according to claim 1, wherein the control mode of the main control unit (5) is set to A mode, B mode, F mode, L mode, M mode, and P One or more of the modes, the A-mode simulated super-run brand is Aston Martin ASTONMARTIN, the B-mode simulated super-run brand is BMW BMW, and the F-mode simulated super-run brand is Ferrari Ferrari, the L-mode simulated super-run brand is Lamborghini Lamborghini, the M-mode simulated super-run brand is Maserati MASERATI, and the P-mode simulated super-run brand is Porsche PORSCHE.
The intelligent acceleration and sound effect control system for an electric vehicle according to claim 1, wherein the electric vehicle (7) comprises an electric motor (3), and the electric motor (3) is provided with a plurality of rotational speed gears, The main control unit (5) controls the motor (3) to start with a low speed gear position and continuously switch the speed gear position The acceleration mode controls the electric vehicle to accelerate with matching acceleration characteristics.
The intelligent acceleration and sound effect control system for an electric vehicle according to claim 1, wherein said electric vehicle (7) comprises an electric motor (3) and a gearbox (8), and said gearbox (8) is provided with a gear ratio gear, the main control unit (5) controls the gearbox (8) to start with a low gear ratio gear and continuously switch the gear ratio gear acceleration mode to control the electric vehicle to match the acceleration characteristics accelerate.
The intelligent acceleration and sound effect control system for an electric vehicle according to claim 1, wherein said electric vehicle (7) comprises an electric motor (3) and a gearbox (8), and said electric motor (2) is provided with a plurality of In the speed gear position, the gearbox (8) is provided with a plurality of gear ratio gear positions, and the main control unit (5) controls the motor (3) to start with a low speed gear position and continuously switch the speed gear position acceleration mode. And controlling the electric vehicle to accelerate with a matching acceleration characteristic by controlling an acceleration mode in which the transmission (8) starts with a low transmission ratio and continuously switches the transmission ratio.
The intelligent acceleration and sound effect control system for an electric vehicle according to claim 1, wherein each of said engine sounds produces a continuous range of engine operation sounds by synthesizing engine speech samples at a typical vehicle speed.
The intelligent acceleration and sound effect control system for an electric vehicle according to any one of claims 1 to 7, characterized in that the acceleration operating device (2) is an accelerator pedal, and the accelerator pedal is provided with an angle sensor, the angle sensor An angular position signal of the accelerator pedal is detected and converted into an electrical acceleration signal.
The intelligent acceleration and sound effect control system for an electric vehicle according to any one of claims 1 to 7, characterized in that the control panel (1) is provided with at least one button and a button recognition circuit in one-to-one correspondence with the control mode. The button recognition circuit recognizes the pressed button and converts it into an electrical control mode selection signal.
The intelligent acceleration and sound effect control system for an electric vehicle according to any one of claims 1 to 7, characterized in that the sounding device (4) is a speaker.