Sound reproduction system and method

Abstract

A sound reproduction system and method includes providing an audio signal using a control unit and transmitting the audio signal to an on-board amplifier disposed in a vehicle via a wired or wireless connection; using the vehicle-mounted amplifier to amplify the audio signal; reproducing sound outside the vehicle based on the audio signal amplified by the in-vehicle amplifier and using at least one vehicle speaker attached to the vehicle outside a cabin; monitoring the movement of the vehicle using a sensor or unit for measuring and evaluating the speed of the vehicle; and deactivating sound reproduction as the vehicle moves and as long as the vehicle moves.

Description

Technical Field

[0001] This disclosure relates to a sound reproduction system and method (generally referred to as the "system"). Background Technology

[0002] Listening to music outdoors, such as on the beach, or while camping or picnicking, is especially popular among young people. In most cases, this involves carrying a portable player with its own power source, such as a rechargeable battery. Because such portable players have limited power and are relatively small, their sound reproduction quality is relatively poor. In particular, spatial sound, such as stereo, is only possible within a very limited range, and the sound power emitted by these devices is often too weak to achieve the intended purpose. Therefore, there is a desire for devices with better sound quality suitable for outdoor activities. Summary of the Invention

[0003] A sound reproduction system includes: a vehicle comprising a passenger compartment; a sensor or unit for measuring and evaluating vehicle speed; at least one vehicle speaker attached to the vehicle outside the passenger compartment and configured to reproduce sound outside the vehicle; and at least one vehicle amplifier operatively coupled to and configured to drive the at least one vehicle speaker. A control unit is operatively coupled to the at least one vehicle amplifier via a wired or wireless connection and configured to provide an audio signal to the vehicle amplifier. Reproduction of the audio signal outside the passenger compartment is deactivated when the sensor or unit for measuring and evaluating vehicle speed detects vehicle movement, and as long as vehicle movement is detected.

[0004] A sound reproduction method includes: providing an audio signal using a control unit and transmitting the audio signal to an onboard amplifier disposed in a vehicle via a wired or wireless connection; amplifying the audio signal using the onboard amplifier; reproducing the sound outside the vehicle based on the audio signal amplified by the onboard amplifier and using at least one vehicle speaker attached to the vehicle outside the passenger compartment; monitoring the movement of the vehicle using a sensor or unit for measuring and evaluating vehicle speed; and deactivating sound reproduction when the vehicle is moving and as long as the vehicle is moving.

[0005] Other systems, methods, features, and advantages will become apparent to those skilled in the art upon review of the following detailed description and accompanying drawings. It is intended that all such other systems, methods, features, and advantages be included within this specification, within the scope of the invention, and protected by the appended claims. Attached Figure Description

[0006] The system can be better understood by referring to the following figures and description. The components in the figures are not necessarily drawn to scale, but rather to emphasize the principles of the invention. Furthermore, in the figures, the same reference numerals indicate corresponding parts in all different views.

[0007] Figure 1 This is a schematic diagram showing the speaker locations of a sound reproduction system that includes speakers for vehicles and nomad devices.

[0008] Figure 2 It is shown Figure 1 The diagram shows the components involved in the sound reproduction system and additional mobile device, with the control unit located in the vehicle's head unit.

[0009] Figure 3 It is shown Figure 1 and Figure 2 The diagram shows a block diagram of the signal path in the sound reproduction system.

[0010] Figure 4 It is shown Figure 1 The diagram shows the components involved in the sound reproduction system and the additional mobile device, wherein the control unit is located in the mobile device.

[0011] Figure 5 It is shown Figure 1 and Figure 4 The diagram shows a block diagram of the signal path in the sound reproduction system.

[0012] Figure 6 This is a schematic diagram illustrating one possible speaker arrangement in which the user is positioned in front of the speakers of the vehicle and the mobile device.

[0013] Figure 7 This is a schematic diagram illustrating one possible speaker arrangement in which the user is located between the vehicle's speakers and the speakers of the moving device.

[0014] Figure 8 This is a flowchart illustrating a method for reproducing sound using the loudspeakers of a vehicle and a moving device. Detailed Implementation

[0015] Figure 1The speaker locations of an example outdoor sound reproduction system are shown, with the speakers employed positioned within vehicle 101. Alternatively, additional speakers, such as portable Bluetooth stereo speakers like the JBL Charge 5, Flip 6, Boombox 3, or Partyboxe, may be positioned in the mobile sound reproduction unit 102. Among other components, vehicle 101 includes a passenger compartment 103, a luggage compartment 104, and four wheel arches. Figure 1 Only the left front wheel arch 105 and left rear wheel arch 106 of vehicle 101 are shown. Vehicle 101 also includes eight speakers arranged in pairs around, for example, the exterior of the vehicle body around four wheel arches, with two speakers 107 and 108 located in the left front wheel arch 105, and two speakers 109 and 110 located on the exterior of the vehicle body around, for example, the left rear wheel arch 106. Figure 1 As shown in the diagram. The other two wheel arches are identical to wheel arches 105 and 106, respectively, and are equipped with speakers in the same manner. Speakers 107-110 mounted in vehicle 101 can be directed away from the side of the vehicle and perpendicular to the longitudinal axis of vehicle 101. Although referred to as a single speaker, each speaker can represent a group of speakers connected to each other in any way, such as in parallel, series, or via a splitter network. The speakers can be any type of speaker, such as woofers, midrange speakers, tweeters, broadband speakers, and any combination thereof, and some or all of them can be part of an Acoustic Vehicle Alerting System (AVAS). The pairs of speakers 107, 108 and 109, 110 and their counterparts around the other wheel arches (not shown) are not necessarily the same and may be of different types. For example, one speaker in such a pair can be a pre-existing AVAS broadband speaker supplemented by an added tweeter, such as a horn.

[0016] Acoustic vehicle alarm systems generate warning sounds designed to alert pedestrians to the presence of electric vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs) traveling at low speeds. Some government regulators consider warning sound devices necessary because vehicles operating in fully electric mode produce less noise than conventional internal combustion engine vehicles, making them less noticeable to pedestrians and cyclists, especially those with visual impairments. Warning sounds can be triggered by the driver or automatically at low speeds. Warning sounds vary in type, ranging from obvious artificial sounds such as buzzers and chimes to sounds mimicking engine noise and tires moving on gravel. Acoustic vehicle alarm systems include speakers that broadcast sounds to the environment surrounding the vehicle. As described herein, these AVAS speakers, or other speakers mounted externally to the vehicle body, or a combination of both, can be used to reproduce classical sounds such as music or voice outdoors, and only when the vehicle is stationary, to avoid interfering with the AVAS system and to prevent movement of the sound source.

[0017] Alternatively, the subwoofer (referred to herein as subwoofer 111) can be integrated into... Figure 1 The outdoor sound reproduction system shown can be, for example, installed in the trunk 104 of vehicle 101. Since low-frequency sounds are generally non-directional and more difficult to suppress compared to high-frequency sounds, the subwoofer can be installed virtually anywhere in vehicle 101. Therefore, other types of speakers are attached to vehicle 101 outside the trunk 103 and are configured to reproduce sound outside vehicle 101, for example, to broadcast sound to the environment surrounding the vehicle.

[0018] An optional mobile sound reproduction device 102 is disposed outside the vehicle 101, is freely movable, and may include two low-frequency speakers (referred to herein as woofers 112 and 113), two mid-range speakers 114 and 115, and two high-frequency speakers (tweeters 116 and 117). These speakers are mounted in, for example, a tubular housing 118, with woofers 112 and 113 disposed at its side ends, and the remaining speakers disposed in the tubular sidewalls of housing 118. For example, the mobile sound reproduction device 102 may be disposed in front of a side door (not shown) of the vehicle, between two sets of tweeters 107, 108 and 109, 110 disposed in wheel arches 105 and 106. The two mid-range speakers 114 and 115 and the two tweeters 116 and 117 point in the same direction as the tweeters 107-110. The woofers 112 and 113 point in the opposite direction, parallel to the longitudinal axis of the vehicle 101. Although this article shows and explains a system with only one gliding device, one or more additional gliding devices can be integrated into the system.

[0019] Figure 2 It shows the use Figure 1 The diagram shows a block diagram of the components involved in an example sound reproduction system with the speaker configuration shown. Sound signals provided by control unit 204 are supplied via amplifiers 201-203 to tweeters 107-110 and an optional subwoofer 111 mounted to vehicle 101. Control unit 204 is operatively coupled to amplifiers 201-203 via wires. A vehicle communication interface (such as Bluetooth (BT) interface 205 (or any other wireless communication interface, such as WiFi)) is operatively coupled to control unit 204, and the audio signals L, R, and control signals C to be reproduced are wirelessly transmitted using Bluetooth interface 205. Figure 2 In the example system shown, control unit 204 and Bluetooth interface 205 are located in the vehicle and may be part of its host unit (HU) 206 as shown, or its electronic control unit (ECU) as not shown. Control unit 204 may include sound processor 207, which allows general sound control, such as volume control and equalization, but may also convert stereo audio signals into higher-order surround sound as described below. Power is supplied to host unit 206 and its components by vehicle battery 208. Speakers 107 and 108 combined with amplifier 201, speakers 109 and 110 combined with amplifier 202, and subwoofer 111 combined with amplifier 203 each form a specific audio signal channel for vehicle 101. Control unit 204 may deactivate sound reproduction of the sound reproduction system when vehicle 101 is moving and whenever vehicle 101 is moving (as detected by sensors or units used to measure and evaluate vehicle speed 221). Although the host unit is shown and explained, a central computer or other suitable data processing architecture may be used alternatively or separately.

[0020] The mobile sound reproduction device 102 includes six speakers 112-117, a mobile communication interface (such as a Bluetooth (BT) interface 209 (or a WiFi interface, etc.)), and six amplifiers 210-215, which are operatively coupled to the Bluetooth interface 209 and the six speakers 112-117. Each amplifier 210-215 drives one of the speakers 112-117 based on an audio signal received from a Bluetooth interface 205 in the vehicle 101 via the Bluetooth interface 209. Speakers 112, 114, and 116 combined with amplifiers 210-212 form one audio signal channel, while speakers 113, 115, and 117 combined with amplifiers 213-215 form another audio signal channel of the mobile sound reproduction device 102. The mobile sound reproduction device 102 and its components are powered by, for example, a rechargeable battery 216, which can be connected to the vehicle battery 208 for charging or to supply power during operation of the mobile sound reproduction device 102 with the vehicle 101.

[0021] Optionally, a mobile device 217 (such as a smartphone) with an installed dedicated software application (APP) 218 ​​can be integrated into the audio reproduction system. The mobile device 217 also includes a mobile communication interface, such as a Bluetooth (BT) interface 219 (or a WiFi interface, etc.) and a microphone 220. The Bluetooth interface 219 allows wireless communication with a vehicle communication interface (i.e., Bluetooth interface 205) to send at least one control signal (including commands and audio signals) to the Bluetooth interface 205. The dedicated software application 218 installed on the mobile device 217 allows control of the mobile device 217 and, via the mobile device 217, control of the control unit 204 of the vehicle 101. The software application 218 can use the microphone 220 to adjust (e.g., calibrate) the sound of the sound reproduction system. The software application 218 can continuously adjust the sound so that the sound experienced by a moving listener remains constant.

[0022] Figure 3 It shows Figure 1 and Figure 2The signal path in the example sound reproduction system is shown. For example, mobile device 217 may include a music library 301 and a pre-installed music player 302, and provide the stereo audio signal to be reproduced to Bluetooth interface 219 of mobile device 217. Software application 218 allows control of music player 302, thereby allowing the execution of user commands such as play, stop, rewind, forward, skip, and select from the list. Alternatively or additionally, another music player and music library (neither shown) may be implemented in vehicle 101, for example in control block 305 of host unit 206 of vehicle 101. Other music players and music libraries may be controlled by software application 218, or may be independent and controllable via host unit or other components in vehicle 101.

[0023] Software application 218 also allows control of sound processor 207 via control signal C and via Bluetooth interface 219, (two-way) wireless connection 303 (e.g., Bluetooth connection), Bluetooth interface 205, and control block 305 of control unit 204. Control of sound processor 207 includes, for example, volume control, equalization adjustment, and sound reproduction mode selection. Sound processor 207 generates audio signals for speaker groups 306-308 in the vehicle. For example, group 306 includes speakers 107 and 108, group 307 includes speakers 109 and 110, and optionally group 308 includes only subwoofer 111. Therefore, the audio signals for groups 306 and 307 can be wideband audio signals, while the audio signals for group 308 can be ultra-low frequency audio signals. The audio signals provided by audio processor 207 are based on stereo audio signals received from mobile device 217 and amplified by amplifiers 201, 202, and 203 (optionally) for speaker groups 306-308.

[0024] Bluetooth interface 205 communicates wirelessly (and bidirectionally) with Bluetooth interface 219 of mobile device 217, and also communicates with Bluetooth interface 209 of mobile device 102 via (bidirectional) wireless Bluetooth connection 309 (or WiFi connection, etc.). Bluetooth interface 209 can receive two audio signals, each of which is divided into low-frequency, mid-frequency, and high-frequency components using cross-over filters 310 and 311. These components are amplified using amplifiers 210-215 and then supplied to speakers 112-117 such that the frequency range of the speakers is matched to the frequency range of the audio signal components supplied to them.

[0025] Sound equalization can be adjusted manually or automatically via software application 218 and sound processor 207. For automatic sound equalization, software application 218 can use microphone 220 to pick up test sounds reproduced by one or more of speakers 107-111 and 112-117. For example, all speakers 107-111 and 112-117 are sequentially supplied with test sounds (or the desired content currently being played), which can be broadband white noise (or any other suitable test tone, such as a swing sine or a pattern of sine or noise tones). The equalization is then adjusted to meet the target frequency characteristics selected by the user through the user interface of software application 218. Sound volume can be adjusted manually or automatically. Sound equalization can be performed continuously (including a periodically repeated equalization process) based on, for example, the audio signal to be reproduced, to allow listeners wearing mobile device 217 to experience a constant sound at various locations.

[0026] The sound processor 207 can operate in various sound modes, including mono, stereo, and some surround sound modes. Figure 3 In the example signal flow diagram shown, sound processor 207 receives two channels L and R of the stereo signal to be reproduced, and generates a four-channel audio signal (channels CH1-CH4) if no subwoofer is used, and generates a five-channel audio signal (channels CH1-CH5) if a subwoofer (such as subwoofer 111 in group 308) is used. Channels CH1, CH2, and CH5 (if available) are reproduced using speakers 107-111 in groups 306-307 located in vehicle 101. Channels CH3 and CH4 are transmitted to movable device 102, wherein the channels are reproduced via speakers 112, 114, and 116 and speakers 113, 115, and 117, wherein speakers 112, 114, and 116 form speaker group 312 for reproducing channel CH3, and speakers 113, 115, and 117 form speaker group 313 for reproducing channel CH4.

[0027] Figure 4 It shows the use of Figure 1 The speaker configuration shown and the components involved in another example of the sound reproduction system of the attached mobile device 401 are illustrated, wherein a control unit (here, control unit 402) is disposed in the mobile device 401, in which an alternative software application 403 (shown) is installed, or operates in another mode of software application 218 (not shown). Bluetooth (or WiFi, etc.) connections are established between the mobile device 401 and the vehicle 101, and between the mobile device 401 and the mobile sound reproduction device 102. The mobile device 102 and... Figure 2 and Figure 3The movable device shown is the same. In this example, vehicle 101 is configured such that host unit 206 does not provide Figure 2 and Figure 3 As shown and combined Figure 2 and Figure 3 The necessary audio signal processing is described because audio processing occurs within the mobile device 401. Instead, the host unit 206 uses the Bluetooth interface 205 to receive and decode Bluetooth signals from the mobile device 401 to provide audio signals L, R, and a control signal C. These signals are supplied to a signal switching arrangement 404, which can turn the audio signals L and R on and off based on the control signal C and signals from the sensor or unit used to measure and evaluate the vehicle speed 407. The signals L and R are then supplied to amplifiers 201 and 202, respectively. Amplifier 203 uses an adder 405 and a low-pass filter 406 to receive the low-pass filtered audio signals L and R. When the vehicle 101 moves, and as long as the vehicle 101 moves, the signal switching arrangement 404, in conjunction with the sensor or unit used to measure and evaluate the vehicle speed 407, disables audio signal reproduction. The sensor or unit used to measure and evaluate vehicle speed 407 (211) can be a pre-existing device of the vehicle, such as a wheel speed sensor (WSS) or a vehicle speed sensor (VSS), or any other type of tachometer, for example, combined with a dedicated evaluation device configured to detect the motion of the vehicle.

[0028] Figure 5 It shows Figure 1 and Figure 4 The signal path in the sound reproduction system shown is illustrated. For example, mobile device 401 may include a music library 301 and a music player 302, and provide stereo audio signals to be reproduced via control unit 402 to the Bluetooth interface 219 of mobile device 217. Software application 403 allows control of control unit 402 and music player 302. At least one of music library 301, music player 302, software application 403, Bluetooth interface 219, and microphone 220 can communicate with... Figure 2 and Figure 3 The corresponding components of the mobile device 217 shown are the same. Although the above is combined Figure 2 , Figure 3 and Figure 4 , Figure 5 Two different mobile devices are described, but a single mobile device can be used, allowing for the implementation of two corresponding operating modes within a single software application combined with appropriate hardware. Sound equalization can be achieved with... Figure 2 and Figure 3 As shown and combined Figure 2 and Figure 3The described system adjusts manually or automatically in a similar or identical manner, including a continuous adjustment mode.

[0029] As described above, the main unit 206 of vehicle 101 does not provide, for example Figure 2 and Figure 3 As shown and combined Figure 2 and Figure 3 The necessary audio signal processing described. This audio processing occurs during... Figure 5 In the system shown, mobile device 401 receives and decodes Bluetooth signals from mobile device 401 using Bluetooth interface 205, which provides audio signals L, R, and control signals C. These signals are supplied to signal switching arrangement 404, which can turn audio signals L and R on and off according to control signal C and signals from sensors or units used to measure and evaluate vehicle speed 407. Audio signals L and R are supplied to amplifiers 201 and 202 as channels CH1 and CH2, respectively, via signal switching arrangement 404. Channel CH5 supplied to amplifier 203 is obtained from low-pass filtering of audio signals L and R using adder 405 and low-pass filter 406. Mobile device 102 receives channels CH3 and CH4 directly from mobile device 401 via wireless connection 408.

[0030] Channels CH1-CH4 (CH5) can be used in various signal configurations with different speaker arrangements, such as Figure 6 and Figure 7 As described in [the text]. The two basic speaker arrangements differ from each other in that, in [the text]... Figure 6 In the first arrangement shown, all speaker groups 306, 307, 308 (optional), 312, and 313 are aligned with each other in the direction of user 601, which is located in front of speaker groups 306, 307, 308 (optional), 312, and 313. User 601 is looking towards vehicle 101 and mobile device 102. Figure 7 In the second arrangement shown, speaker groups 306, 307, and 308 (optionally) in vehicle 101 are aligned with each other in a direction opposite to the direction in which speaker groups 312 and 313 (partially) in mobile device 102 are aligned. User 601 is located between vehicle 102 and mobile device 102 and is looking at vehicle 101, with mobile device 102 behind him or her.

[0031] These two example arrangements allow for a variety of signal configurations. Based on Figure 6The arrangement shown produces enhanced stereo sound, wherein speaker groups 306 and 313 are supplied with the left stereo channel L, and speaker groups 307 and 312 are supplied with the right stereo channel R. An optional subwoofer group 308 may be supplied with low-pass filtered signals for the left stereo channel L and the right stereo channel R. Figure 6 As can be seen, the stereo baseline of the oscillating device 102 has been extended so that it is now equal to the distance between the two speaker groups 306 and 307. Alternatively, a three-channel configuration can be established. Speaker group 306 is coupled to channel CH1 to form the left channel, speaker group 307 is coupled to channel CH2 to form the right channel, and speaker groups 312 and 313, combined with channels CH3 and CH4, are connected in parallel to form the center channel. An optional subwoofer group 308 may be supplied with low-pass filtered signals from channels CH3 and CH4 (to establish a pseudo-three-channel configuration) or with signals from an additional subwoofer channel (to establish a three-channel configuration).

[0032] based on Figure 7 The arrangement shown can establish a four-channel configuration (e.g., a four-channel quadrophonic configuration), where each of the channels CH1-CH4 combined with speaker groups 306, 307, 312, and 313 is used as one of the four quadrophonic channels. By combining an optional subwoofer group 308 with the additional (subwoofer) channel CH5, a five-channel configuration, such as a 4.1 surround sound configuration, can be established. Generally speaking, Figure 6 and Figure 7 The arrangements shown allow for one-channel configurations (e.g., a monoural configuration where all speaker groups are supplied with a common single audio signal), two-channel configurations (e.g., stereo configurations in different implementations), three-channel configurations (e.g., having two main channels and one auxiliary channel, or having three main channels), four-channel configurations (e.g., two main channels and two auxiliary channels, three main channels and one auxiliary channel, or four main channels), and five-channel configurations (e.g., four main channels and one auxiliary channel, or five main channels).

[0033] refer to Figure 8An example sound reproduction method includes: providing an audio signal using a control unit and transmitting the audio signal to an onboard amplifier located in the vehicle via a wired or wireless connection (procedure 801); amplifying the audio signal using the onboard amplifier (procedure 802); and reproducing the sound outside the vehicle based on the audio signal amplified by the onboard amplifier and using at least one vehicle speaker attached to the outside of the vehicle (procedure 803). The method also includes monitoring the movement of the vehicle using a sensor or unit for measuring and evaluating vehicle speed (procedure 804), and deactivating sound reproduction when and as long as the vehicle is moving (procedure 805).

[0034] The methods described above can be encoded and stored in a computer-readable medium (such as a CD-ROM, disk, flash memory, RAM or ROM, electromagnetic signal, or other machine-readable medium) as instructions executed by a processor. Alternatively or additionally, any type of logic can be used, and any type of logic can be implemented in hardware as analog or digital logic, such as one or more integrated circuits (including amplifiers, adders, delayers, and filters) or one or more processors that execute amplification, addition, delay, and filtering instructions; or in software in an application programming interface (API) or dynamic link library (DLL), as a function available in shared memory or defined as a local or remote program call; or as a combination of hardware and software.

[0035] The method may be implemented, in part or in whole, by software and / or firmware stored on or in a computer-readable medium, a machine-readable medium, a propagation signal medium, and / or a signal-bearing medium. The medium may include any means that contains, stores, communicates, propagates, or transmits executable instructions for use by or in connection with an executable system, device, or apparatus. A machine-readable medium may optionally be, but is not limited to, electronic, magnetic, optical, electromagnetic, or infrared signal or semiconductor systems, devices, apparatuses, or propagation media. A non-exhaustive list of examples of machine-readable media includes: magnetic disks or optical disks, volatile memory (such as random access memory "RAM", read-only memory "ROM", erasable programmable read-only memory (i.e., EPROM) or flash memory), or optical fiber. A machine-readable medium may also include a tangible medium on which executable instructions are printed, as the logic may be electronically stored as an image or in other formats (e.g., by optical scanning), and then compiled and / or interpreted or otherwise processed. The processed medium may then be stored in computer and / or machine memory.

[0036] The system may include at least one of a controller, microprocessor, microcontroller, application-specific integrated circuit (ASIC), discrete logic, or other type of circuit or logic, and may be implemented in many different ways. Similarly, the memory may be DRAM, SRAM, flash memory, or other types of memory. Parameters (e.g., conditions and thresholds) and other data structures may be stored and managed separately, may be incorporated into a single memory or database, or may be logically and physically organized in many different ways. Programs and instruction sets may be a single program, part of a single program, or may be distributed across several memories and processors.

[0037] The embodiments have been described for purposes of illustration and description. Suitable modifications and variations of the embodiments can be performed in light of the foregoing description or obtained based on practical methods. For example, unless otherwise indicated, one or more of the described methods can be performed by suitable means and / or combinations of means. The described methods and associated actions can also be performed in various sequences, in parallel and / or simultaneously, other than those described in this application. The described system is exemplary in nature and may include additional elements and / or omit elements.

[0038] As used in this application, elements or steps listed in the singular and preceded by the word "an" or "a" should be understood as not excluding multiple said elements or steps unless such exclusion is specified. Furthermore, references to "an embodiment" or "an example" in this disclosure are not intended to exclude the existence of additional embodiments incorporating the listed features. The terms "first," "second," and "third," etc., are used merely as labels and are not intended to impose numerical requirements or a specific order of position on their objects.

[0039] While various embodiments of the invention have been described, it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the invention. Specifically, those skilled will recognize the interchangeability of various features from different embodiments. Although these techniques and systems have been disclosed in the context of certain embodiments and examples, it should be understood that these techniques and systems can be extended beyond the specifically disclosed embodiments to other embodiments and / or uses and obvious modifications thereof.

Claims

1. A sound reproduction system, comprising: The vehicle includes: a passenger compartment; a sensor or unit for measuring and evaluating vehicle speed; at least one vehicle speaker attached to the outside of the passenger compartment and configured to reproduce sound outside the vehicle; and at least one on-board amplifier operatively coupled to and configured to drive the at least one vehicle speaker; and A control unit, operatively coupled to the at least one vehicle amplifier via a wired or wireless connection, and configured to provide an audio signal to the vehicle amplifier; wherein The reproduction of the audio signal outside the vehicle compartment is deactivated whenever the sensor or unit used to measure and evaluate the vehicle speed detects movement of the vehicle.

2. The system of claim 1, further comprising a movable sound reproduction device disposed outside the vehicle and capable of free movement, the movable sound reproduction device comprising at least one movable speaker and at least one movable amplifier operatively coupled to the at least one movable speaker, the at least one movable amplifier being configured to drive the at least one movable speaker, and the at least one movable amplifier being operatively coupled to the control unit via a wireless connection.

3. The system of claim 1 or 2, further comprising a mobile device operatively coupled to the vehicle or operatively coupled to both the vehicle and the mobile sound reproduction device via a wireless connection, wherein the mobile device has a dedicated software application installed and configured to control the control unit.

4. The system of claim 3, wherein the control unit is disposed in the mobile device and operatively coupled to the at least one vehicle amplifier via a wireless connection.

5. The system of any one of claims 1 to 3, wherein the control unit is disposed in the vehicle and operatively coupled to the at least one vehicle amplifier via a wired connection.

6. The system of claim 3, wherein the mobile device includes a microphone, which is used by the control unit to adjust the sound to be reproduced by the at least one vehicle speaker or the at least one mobile speaker or both.

7. The system of claim 6, wherein the control unit is configured to continuously adjust the sound to be reproduced by the at least one vehicle speaker or the at least one mobile speaker or both.

8. The system of claim 2, wherein the control unit of the vehicle is configured to drive the at least one vehicle speaker and the at least one roaming speaker in a surround sound mode.

9. A method for sound reproduction, comprising: The control unit is used to provide audio signals and transmit the audio signals to the vehicle-mounted amplifier via a wired or wireless connection. The audio signal is amplified using the vehicle amplifier. The sound is reproduced on the exterior of the vehicle based on the audio signal amplified by the vehicle amplifier and using at least one vehicle speaker attached to the vehicle exterior. The movement of the vehicle is monitored using sensors or units for measuring and evaluating vehicle speed; as well as The sound reproduction will be deactivated when the vehicle is moving, and as long as the vehicle is moving.

10. The method of claim 9, further comprising: The audio signal is transmitted wirelessly to a mobile amplifier located in the mobile sound reproduction device; The audio signal is amplified using the aforementioned roaming amplifier; as well as Sound is reproduced using at least one mobile loudspeaker disposed in the mobile sound reproduction device, based on the audio signal amplified by the mobile amplifier; in The moving sound reproduction device is located outside the vehicle and can move freely.

11. The method of claim 9 or 10, further comprising using a mobile device to control the control unit, the mobile device being operatively coupled to the vehicle via a wireless connection or operatively coupled to both the vehicle and the mobile sound reproduction device via a wireless connection.

12. The method of claim 11, wherein the control unit is disposed in the mobile device and operatively coupled to the at least one vehicle amplifier via a wireless connection.

13. The method of any one of claims 9 to 11, wherein the control unit is disposed in the vehicle and operatively coupled to the at least one on-board amplifier via a wired connection.

14. The method of claim 11, further comprising using the control unit combined with the microphone disposed in the mobile device to adjust the sound to be reproduced by the at least one vehicle speaker or the at least one mobile speaker or both thereof.

15. The method of claim 14, further comprising continuously adjusting the sound to be reproduced by the at least one vehicle speaker or the at least one mobile speaker or both thereof.

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