Portable sound box

Abstract

The utility model relates to the field of sound box equipment, and especially relates to a portable sound box comprising a box body which is internally provided with a first loudspeaking module and a second loudspeaking module; a digital signal processing chip is arranged between the first output channel of the first loudspeaker module and the second output channel of the second loudspeaker module. The digital signal processing chip is used for processing the digital signal of the second output channel, transmitting the processed digital signal to the first output channel and transmitting the processed digital signal to the first loudspeaking module for outputting or processing the digital signal of the first output channel, transmitting the processed digital signal to the second output channel and transmitting the processed digital signal to the second loudspeaking module for outputting; wherein the digital signal processing chip comprises a signal delay module, a filtering module, a phase inversion module and a signal gain module which are connected in series.

Description

Technical Field

[0001] The utility model relates to the field of sound box equipment, in particular to a portable sound box. Background Art

[0002] Nowadays, most of the popular music is recorded in stereo. When users listen, the left and right speakers are separated, and the left and right speakers form an angle θ with the listener, and usually satisfy 20°<θ<60°, so that they can hear a sound field that is close to the real restoration of the live performance.

[0003] However, the portable speakers that are popular nowadays either do not have the ability to reproduce stereo sound, or even if they do, the distance between the left and right speakers is too close to form a satisfying angle, resulting in a poor sound field effect. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a portable speaker that can reproduce a grand sound field.

[0005] A portable speaker according to an embodiment of the utility model includes: a box body, in which a first speaker module and a second speaker module are arranged; a digital signal processing chip is arranged before a first output channel of the first speaker module and a second output channel of the second speaker module, and the digital signal processing chip is used to process the digital signal of the second output channel and then transmit it to the first output channel and transmit it to the first speaker module for output, or process the digital signal of the first output channel and then transmit it to the second output channel and transmit it to the second speaker module for output; wherein the digital signal processing chip includes a signal delay module, a filtering module, a phase reversal module and a signal gain module connected in series.

[0006] A portable speaker according to an embodiment of the utility model has at least the following beneficial effects:

[0007] Through the built-in digital signal processing (DSP) chip, it can process various digital signal operations, such as signal delay, filtering, phase inversion and gain adjustment, to optimize audio output. The signal delay module is used to add delay to the audio signal, which helps to simulate the effect of sound propagation in different distances and environments, thereby enhancing the stereo effect and making the sound field more grand. The filtering module is used to adjust the frequency components of the audio signal, which can be used to simulate different sound propagation environments to further enhance the depth and width of the sound field. The phase inversion module can help adjust and optimize the sound superposition effect between the two speaker modules by changing the phase of the audio signal, reduce unnecessary sound interference, and thus clearly separate the left and right channels to enhance the stereo effect. The signal gain module is responsible for adjusting the intensity of the audio signal to ensure that the audio output has sufficient volume. Through the collaborative work of the above modules, this designed portable speaker can reproduce a wide and three-dimensional sound field effect comparable to that of a large speaker through sophisticated signal processing technology while maintaining portability. This not only improves the sound quality and listening experience of the speaker, but also greatly expands the usage scenarios and user experience of portable speakers.

[0008] According to some embodiments of the utility model, an infrared ranging module is also provided in the box body, and the infrared ranging module is connected to the digital signal processing chip, and is used to detect the distance between an object within a preset range and the box body, and transmit the distance to the digital signal processing chip, so that the digital signal processing chip processes the digital signal according to the distance.

[0009] According to some embodiments of the utility model, the infrared ranging module is also used to obtain a first direction where an object is located, the first speaker module or the second speaker module includes at least one sub-speaker, and the digital signal processing chip also includes a phase control module, and the phase control module is connected between the first speaker module and the signal gain module or between the second speaker module and the signal gain module, and the phase control module is used to control the phase of the sound waves emitted by each sub-speaker so that the sound waves reinforce each other in the first direction and cancel each other out in other directions.

[0010] According to some embodiments of the utility model, at least one high-sensitivity microphone is integrated in the box, and the microphone is connected to the digital signal processing chip for obtaining the noise value of the surrounding links in real time, and the noise level of the current environment is judged by sending the noise value to the digital signal processing chip and the output volume of the speaker is adjusted in real time based on the judgment result of the noise level.

[0011] According to some embodiments of the present invention, the sound-emitting part of the second speaker module or the first speaker module is provided with a sound wave diffuser.

[0012] According to some embodiments of the present invention, the box is a cuboid or a cylinder, the first speaker module is arranged on a first speaker surface of the box, the second speaker module is arranged on a second speaker surface of the box, and the first speaker surface and the second speaker surface are two opposite surfaces.

[0013] According to some embodiments of the present invention, a passive radiator is provided on the non-sound-emitting surface of the box.

[0014] According to some embodiments of the utility model, a dynamic compensation module is further provided in the box, and the dynamic compensation module is connected to the digital signal processing chip, and is used for performing real-time compensation for the bass according to the digital signal.

[0015] According to some embodiments of the present invention, the box is further provided with a micro projector module, and the micro projector module is wirelessly connected to a data source device.

[0016] According to some embodiments of the present invention, the delay parameter of the signal delay module is set between 0.05ms and 0.5ms, the signal gain module is used to perform overall attenuation on the digital signal, and the attenuation ratio is set between 0.6 and 1. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 A working principle diagram of a portable speaker in the related art of the embodiment of the utility model;

[0019] Figure 2 A schematic diagram of a portable speaker in the related art of the embodiment of the utility model;

[0020] Figure 3 The effect diagram of the portable speaker provided by the embodiment of the utility model;

[0021] Figure 4 A schematic diagram of a portable speaker provided by an embodiment of the utility model;

[0022] Figure 5 A schematic diagram of signal processing of a portable speaker shown in an embodiment of the utility model;

[0023] Figure 6 Another signal processing schematic diagram of a portable speaker shown in an embodiment of the utility model;

[0024] Figure 7 Another signal processing schematic diagram of a portable speaker shown in an embodiment of the utility model;

[0025] Figure 8 Another signal processing schematic diagram of a portable speaker shown in an embodiment of the utility model;

[0026] Fig. 9 A schematic diagram of a speaker module of a portable speaker according to an embodiment of the present utility model;

[0027] Fig.10 Another schematic diagram of a speaker module of a portable speaker according to an embodiment of the present invention.

[0028] Fig.11 Another effect diagram of the portable speaker provided by the embodiment of the utility model;

[0029] Fig.12 A schematic diagram of the arrangement of the speaker modules of the portable speaker provided in an embodiment of the utility model;

[0030] Fig.13 A schematic diagram of the structure of a portable speaker provided by an embodiment of the utility model;

[0031] Fig.14 Another signal processing schematic diagram of a portable speaker shown in an embodiment of the utility model;

[0032] Fig.15 Another signal processing schematic diagram of a portable speaker shown in an embodiment of the utility model. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] Before further describing the embodiments of the present disclosure in detail, the nouns and terms involved in the embodiments of the present disclosure are described. The nouns and terms involved in the embodiments of the present disclosure are subject to the following interpretations:

[0039] Digital Signal Processing (DSP) is a special microprocessor chip that uses digital methods to process and analyze various continuous-time analog signals from the real world (such as sound, images, sensor data, etc.). DSP chips are manufactured using MOS integrated circuit technology and are widely used in audio signal processing, telecommunications, digital image processing, radar, sonar and speech recognition systems, as well as daily consumer electronic devices such as mobile phones, disk drives and high-definition television (HDTV) products.

[0040] In the field of music recording and playback, stereo technology has become an important standard. It provides listeners with a rich sound field experience by reproducing the left and right channels separately, as if they were at a live music performance. Ideally, in order to obtain the best stereo effect, the left and right speakers should form a certain angle θ with the listener, such as Figure 1The angle shown is usually recommended to be between 20° and 60°. Such a layout helps to locate and layer the various sound elements in the music, allowing people to feel the depth and spatial sense of the music, thereby more realistically restoring the feeling of live performance.

[0041] In modern life, portable speakers are widely welcomed due to their lightness and portability. People want to enjoy high-quality music at any location, whether at home, in the office or outdoors. However, in the related art, most portable speakers have certain limitations in design, especially in the reproduction of stereo effects. First, many portable speakers have only one speaker unit and cannot provide a stereo music experience at all. Second, even those portable speakers designed for stereo, such as Figure 2 As shown in the figure, the physical distance between the left and right speakers is too close to form the recommended angle θ, which greatly weakens the sense of width and three-dimensionality of the sound field. This design limitation makes it difficult for listeners to get the best music enjoyment, especially for users who pursue high-quality sound experience. In addition, this design defect of portable speakers not only affects the spatial sense and immersion of music, but may also cause other aspects of sound quality to be impaired, such as sound separation and clarity. In some cases, closely arranged speaker units may cause interference in sound waveforms, thus affecting the overall performance of the sound.

[0042] The utility model aims to solve at least one of the technical problems existing in the prior art. Based on this, the utility model proposes a portable speaker, which can also reproduce the sound of the portable speaker by adopting virtual sound source technology. Figure 3 The grand sound field shown.

[0043] The utility model is further described below in conjunction with the accompanying drawings:

[0044] To play back stereo recordings, two separate speakers with a certain angle difference are needed to enhance the difference in the signals received by the two ears. In this way, the left channel playback source is judged to be in the left front position, and the right channel signal source is judged to be in the right front position. The distance between the left and right sound sources is far enough to form a stereoscopic perceptual sound field between the two sound sources.

[0045] However, Figure 4 As shown, since the distance between the two speakers of the portable speaker is very close, the difference between the distance Fl received by the left ear from the left speaker and the distance Fr' received by the right ear from the left speaker is very small. Similarly, the difference between the distance Fl' received by the right ear from the left speaker and the distance Fr received by the right ear is also very small. At this time, the signals heard by the two ears are:

[0046] El = f(Sl, Fl) + f(Sr, Fr')

[0047] ≈f(Sl, Fl)+f(Sr, Fl)

[0048] =f(Sl+Sr, Fl);

[0049] El = f(Sr, Fr) + f(Sl, Fl')

[0050] ≈f(Sr,Fr)+f(Sl,Fr)

[0051] =f(Sl+Sr,Fr);

[0052] Among them, f(x, y) is the transfer function of the audio signal with respect to the transmission distance. Since the transfer functions of the left and right channel signals themselves are almost the same, the sound sources of the left and right channels are judged to be at the same position. Therefore, it is necessary to add a specially processed right channel signal to the signal to the left speaker of the portable speaker, and add a specially processed left channel signal to the signal to the right speaker, so that the two ears can hear the following signal:

[0053] El=f(Sl, Fl)+f(Sr, Fx'), Er=f(Sr, Fr)+f(Sl, Fx')

[0054] Among them, Fx' is a transfer function distance with a larger angle and a longer distance than Fl' and Fr', which will make the listener feel that the sound is emitted from another place (the dotted speaker in the figure), so the entire sound field becomes very wide.

[0055] like Figure 5 As shown, a portable speaker according to the first aspect of the present utility model includes:

[0056] The box body 100 has a first speaker module 110 and a second speaker module 120 therein; a digital signal processing chip 130 is arranged before the first output channel 140 of the first speaker module 110 and the second output channel 150 of the second speaker module 120, and the digital signal processing chip 130 is used to process the digital signal of the second output channel 150 and transmit it to the first output channel 14- and transmit it to the first speaker module 110 for output, or process the digital signal of the first output channel 140 and transmit it to the second output channel 150 and transmit it to the second speaker module 120 for output, and the digital signal processing chip 130 includes a signal delay module 131, a filter module 132, a phase reversal module 133 and a signal gain module 134 connected in series.

[0057] The cabinet 100 is the outer shell of the speaker, provides a physical space for loading other components, and has a certain acoustic design to optimize the sound output effect.

[0058] The first speaker module 110 and the second speaker module 120 are respectively arranged at different positions in the box, and they work together to achieve stereoscopic sound playback. Each speaker module includes a corresponding audio output channel, that is, the first speaker module 110 has a first output channel 140, and the second speaker module 120 has a second output channel 150.

[0059] Among them, the digital signal processing chip 130 is used to increase the signal difference between the left and right ears of the listener, and processes the signal through the signal delay module 131, the filter module 132, the phase reversal module 133 and the signal gain module 134. It can be understood that the connection order of the series signal delay module 131, the filter module 132, the phase reversal module 133 and the signal gain module 134 can be adjusted at will. As long as the signal is processed in these ways, the same effect can be achieved. This embodiment does not limit the connection order between the modules.

[0060] In some embodiments, the delay time of the signal delay module 131 can be 0.05ms to 0.5ms, and the delay time within this range can be adjusted based on the actual distance L2 between the first speaker module 110 and the second speaker module 120. There will be a slight time difference between the two ears of a human receiving the sound from the same sound source, and this time difference is one of the key factors for humans to locate the direction of the sound source. By adjusting the delay, the time difference between the sound from the speaker to the two ears of the listener can be simulated, which increases the stereoscopic and spatial sense of the sound field.

[0061] The filter module 132 can adjust the attenuation of high-frequency signals according to the angle. When sound propagates in space, the high-frequency components reaching the ear on the side far from the sound source will be relatively weakened due to air absorption. By adjusting the filter parameters and simulating the attenuation of such high-frequency signals, the accuracy and stereoscopic sense of sound positioning can be enhanced, making the listener feel that the sound is more natural and real.

[0062] Among them, the phase inversion module 133 is used to generate a signal with the same amplitude as the original signal but opposite phase, with the purpose of offsetting or reducing the undesirable sound components under specific conditions. This can be used to simulate the directionality of sound, and by reducing or eliminating sounds in certain directions, the sense of direction and stereoscopic sense of the sound field is enhanced. Specifically, if the original signal (such as Sr) is naturally transmitted to the listener's right ear (Er) in the air, and at the same time we send a signal with the same amplitude as Sr but opposite phase through another speaker (such as Sl) of the sound box, when this anti-phase signal reaches the listener's left ear (El), it can offset or reduce the influence of Sr received by Er to a certain extent. This method can enhance the stereoscopic sense and sense of direction of the sound, making the listener feel that the location of the sound source is clearer and the sound field is wider and more realistic.

[0063] Among them, the signal gain module 134 is used to attenuate the signal as a whole, and the ratio can be between 0.6 and 1. The specific value can be adjusted based on the actual distance L2 between the first speaker module 110 and the second speaker module 120. The purpose is to simulate the energy attenuation of sound during propagation. Unlike filtering, gain adjustment uniformly adjusts the signal amplitude of all frequency bands instead of adjusting specific frequencies. Such processing helps to reproduce the sense of distance of sound, allowing the listener to feel the spatial distance between the sound source and themselves.

[0064] Through the organic combination of the above structures and modules, even if the physical separation distance between the left and right channels is limited, the portable speaker of the utility model can simulate a wide and realistic sound field effect through digital signal processing technology, significantly improving the user's auditory experience. This design is not only suitable for music playback, but also for watching a variety of media content such as movies and games, providing users with a new portable audio solution.

[0065] In some embodiments, a signal of f(Fx', Sr) may be added to the left speaker, and a signal of f(Fx', Sl) may be added to the right speaker, so that the signal heard by the listener is:

[0066] El=f(Sl, Fl)+f(Sr, Fx'), Er=f(Sr, Fr)+f(Sl, Fx')

[0067] So that the sound produced is Figure 4 The dotted line speaker emits a feeling of a larger sound field. The process of simulating the signal of Fx' is the same as that of simulating Fr' and Fl'. The difference is that the specific delay, filtering and amplitude attenuation are different due to the different angles. This embodiment does not limit this. At the same time, a phase inversion module is not required here.

[0068] In some embodiments, Figure 6 As shown, an infrared ranging module 160 is also provided in the box 100, and the infrared ranging module is connected to the digital signal processing chip 130, and is used to detect the distance between an object within a preset range and the box 100, and transmit the distance to the digital signal processing chip 130, so that the digital signal processing chip processes the digital signal according to the distance.

[0069] The infrared ranging module 160 works based on the emission and reception of infrared light. The infrared beam emitted by the module will be reflected back when encountering an obstacle (such as a human body), and the module calculates the distance by measuring the time it takes for the infrared light to be emitted and returned. This distance information is then transmitted to the digital signal processing chip 130. After receiving the distance data provided by the infrared ranging module 160, the digital signal processing chip 130 can dynamically adjust the processing strategy of the audio signal according to the distance. This may include but is not limited to:

[0070] Delay adjustment: Adjust the delay of the audio signal according to the distance between the audience and the speaker to simulate the time difference of sound at different distances and enhance the three-dimensional sense of the sound field.

[0071] Filter and gain adjustment: adjust the frequency response and overall volume of the audio signal to adapt to the actual distance between the listener and the speaker, simulating the attenuation effect of sound propagation in space.

[0072] Phase adjustment: In specific application scenarios, the phase of the audio signal is fine-tuned based on the distance information to further optimize the direction and positioning of the sound.

[0073] In some embodiments, Figure 7 As shown, the infrared ranging module 160 is also used to obtain the first direction where the object is located, the first speaker module 110 or the second speaker module 120 includes at least one sub-speaker, and the digital signal processing chip 130 also includes a phase control module 135. The phase control module 135 is connected between the first speaker module 110 and the signal gain module 134 or between the second speaker module 120 and the signal gain module 134. The phase control module 135 is used to control the phase of the sound waves emitted by each sub-speaker so that the sound waves enhance each other in the first direction and cancel each other out in other directions.

[0074] Among them, the phase control module 135 is connected between the first speaker module 110 or the second speaker module 120 and the signal gain module 134. Its main function is to accurately control the phase of the sound waves emitted by each sub-speaker. Through this control, the sound waves can be mutually enhanced in a specific direction and mutually offset in other directions, thereby forming a more concentrated and clear sound field in the first direction. The enhancement of sound in a specific direction through precise control of the phase utilizes the principle of sound wave interference. When the sound waves from different sub-speakers are in phase in a certain direction, they will enhance each other to form an enhanced area of ​​sound waves; while in other directions, due to the difference in phase, the sound waves will offset each other, thereby weakening the propagation of sound. This technology is called beamforming in the audio field, which allows the speaker to provide a more customized listening experience for a specific listener or audience group. For example, in a home theater system, phase control can be used to ensure that the best listening position obtains the most ideal sound effect, while reducing sound interference in other areas. In public places, such as conference rooms or lecture halls, this technology can also be used to ensure that the sound is more concentratedly transmitted to the target audience while reducing the noise impact on the surrounding environment. The combined use of the infrared ranging module 160 and the phase control module 135 greatly enhances the ability of the portable speaker in sound processing and control, providing users with a richer and more personalized listening experience.

[0075] In some embodiments, Figure 8 As shown, at least one highly sensitive microphone 170 is integrated in the box 100, and the microphone 170 is connected to the digital signal processing chip 130, and is used to obtain the noise value of the surrounding links in real time. By sending the noise value to the digital signal processing chip 130, after the digital signal processing chip 130 receives the noise level information from the microphone 170, it will judge the noise level of the current environment according to a preset algorithm or logic, and adjust the output volume of the speaker in real time accordingly. For example, in a relatively quiet environment, the speaker can automatically lower the volume to avoid the excessive sound of music affecting others or destroying the quiet atmosphere. On the contrary, in a noisy environment, the speaker can increase the volume to ensure that the music or content can be clearly delivered to the user.

[0076] In some embodiments, Fig. 9 As shown, a sound wave diffuser 111 is provided on the sound emitting side of the second speaker module 120 or the first speaker module 110 .

[0077] in, Fig.10It is the directional characteristic of the traditional portable speaker in the horizontal direction. The user can only hear relatively good sound when in the light blue area. In other areas, due to the directional characteristics of the speaker radiation, the sound quality will be attenuated. Especially for high pitch, the higher the frequency, the more attenuation. The speaker radiation itself has a directional characteristic, and the high frequency radiates in a certain range directly in front. In this embodiment, by installing a sound wave diffuser 111 on the generating side of the second speaker module 120 or the first speaker module 110, the sound waves are forced to radiate to the side, so that the surrounding 360° range is evenly radiated. Fig.11 Install the speakers with diffusers at both ends of the speaker so that the radiation of the speaker can be uniform and the same balanced sound quality can be obtained at any height in the vertical direction.

[0078] In some embodiments, Fig.12 As shown, the box 100 is a rectangular parallelepiped or a cylinder. Figure 5 The left picture shows the arrangement of the speakers of a traditional portable speaker, where the sound center distance between the two speakers is L1. The first speaker module is set on the left and right sides of the speaker, i.e., the two speaker surfaces. In this way, even if the speaker length is the same, the speaker sound center distance L2>L1, thereby physically increasing the difference in the signals received by the left and right ears as much as possible.

[0079] In some embodiments, Fig.13 As shown, the non-sound-raising surface of the box 100 is provided with a passive radiator 180. The passive radiator 180 is a speaker unit without a motor drive, which vibrates by interacting with the air pressure changes inside the speaker, thereby assisting in enhancing the low-frequency response. Since portable speakers pursue a compact design, the use of a passive radiator can effectively enhance the low-frequency performance without significantly increasing the volume of the speaker. Since portable speakers pursue a compact design.

[0080] In some embodiments, Fig.14 As shown, in some embodiments, Figure 8 As shown, a dynamic compensation module 190 is provided in the box 100, and the dynamic compensation module 190 is connected to the digital signal processing chip 130, and is used to compensate the bass in real time according to the digital signal. This process generally involves the following steps:

[0081] Signal Analysis: The dynamic compensation module 190 first analyzes the input audio signal to identify its spectral characteristics, especially the energy level and dynamic range of the low-frequency part.

[0082] Compensation strategy development: Based on the results of the signal analysis, it is calculated how much compensation is needed for the low frequencies to keep the audio output balanced and natural. This strategy takes into account the volume level, the characteristics of the audio content, and the physical limitations of the speakers themselves.

[0083] Bass enhancement: Based on the established compensation strategy, the module enhances or adjusts the low-frequency signal, and achieves dynamic compensation for the bass by adjusting the low-frequency gain, applying specific filter settings, etc.

[0084] Output adjustment signal: The adjusted audio signal is sent back to the digital signal processing chip 130 and then output to the speaker module of the speaker, so that the user can hear the optimized sound quality, especially the fuller and deeper bass effect.

[0085] In some embodiments, Fig.15 As shown, a micro projector module 101 is further disposed outside the box 100 , and the micro projector module 101 is connected to the first speaker module 110 and the second speaker module 120 , and is wirelessly connected to a projection data source device.

[0086] Among them, the connection between the micro projector module 101 and the first speaker module 110 and the second speaker module 120 ensures the synchronous playback of audio and video. This means that while watching the projected content, the user can enjoy the stereo audio effect that matches it, thereby providing a more immersive viewing experience. The micro projector module can be connected to the projection data source device (such as a smartphone, tablet computer, laptop or other smart media playback device) through wireless technology (such as Wi-Fi, Bluetooth, etc.). This wireless connection capability provides great flexibility and convenience, and users can easily share and play content stored on mobile devices without complicated cable connections.

[0087] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. The above are only preferred implementation methods of the utility model. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principle of the utility model, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the protection scope of the utility model.

Claims

1. A portable speaker, characterized in that: include: A box body, wherein a first speaker module and a second speaker module are arranged in the box body; a digital signal processing chip is arranged before the first output channel of the first speaker module and the second output channel of the second speaker module, and the digital signal processing chip is used to process the digital signal of the second output channel and then transmit it to the first output channel and transmit it to the first speaker module for output, or process the digital signal of the first output channel and then transmit it to the second output channel and transmit it to the second speaker module for output; wherein the digital signal processing chip includes a signal delay module, a filtering module, a phase reversal module and a signal gain module connected in series.

2. The portable speaker according to claim 1, characterized in that: An infrared ranging module is also provided in the box body, and the infrared ranging module is connected to the digital signal processing chip, and is used to detect the distance between the target object within a preset range and the box body, and transmit the distance to the digital signal processing chip, so that the digital signal processing chip processes the digital signal according to the distance.

3. The portable speaker according to claim 2, characterized in that: The infrared ranging module is also used to obtain a first direction where an object is located. The first speaker module or the second speaker module includes at least one sub-speaker. The digital signal processing chip also includes a phase control module. The phase control module is connected between the first speaker module and the signal gain module or between the second speaker module and the signal gain module. The phase control module is used to control the phase of the sound waves emitted by each sub-speaker so that the sound waves reinforce each other in the first direction and cancel each other out in other directions.

4. The portable speaker according to claim 1, characterized in that: At least one high-sensitivity microphone is integrated in the box, and the microphone is connected to the digital signal processing chip for obtaining the noise value of the surrounding links in real time, and the noise level of the current environment is judged by sending the noise value to the digital signal processing chip, and the output volume of the speaker is adjusted in real time based on the judgment result of the noise level.

5. The portable speaker according to claim 1, characterized in that: The sound-emitting part of the second speaker module or the first speaker module is provided with a sound wave diffuser.

6. The portable speaker according to claim 1, characterized in that: The box is a cuboid or a cylinder, the first speaker module is arranged on a first speaker surface of the box, the second speaker module is arranged on a second speaker surface of the box, and the first speaker surface and the second speaker surface are two opposite surfaces.

7. The portable speaker according to claim 6, characterized in that: The non-sound-emitting surface of the box is provided with a passive radiator.

8. The portable speaker according to claim 1, characterized in that: A dynamic compensation module is also provided in the box, and the dynamic compensation module is connected to the digital signal processing chip and is used for performing real-time compensation for the bass according to the digital signal.

9. The portable speaker according to claim 1, characterized in that: The box is also provided with a micro projector module, and the micro projector module is wirelessly connected to a projection data source device.

10. The portable speaker according to claim 1, characterized in that: The delay parameter of the signal delay module is set between 0.05ms and 0.5ms. The signal gain module is used to perform overall attenuation on the digital signal, and the attenuation ratio is set between 0.6 and 1.

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