Sound output device and projector

Abstract

The present disclosure relates to a sound output device and a projector. The sound output device includes an audio processing module and at least one first sound output module. The audio processing module is used to receive an initial audio signal and perform frequency division processing and modulation processing on the initial audio signal to output a first audio signal. The first sound output module includes a substrate and a plurality of first speakers, and the plurality of first speakers are arranged in an array on the substrate. The plurality of first speakers are ultra-high frequency speakers. The plurality of first speakers emit ultrasonic waves according to the first audio signal. The above design converts the initial audio signal into a first audio signal and outputs it to the first sound output module by performing frequency division processing and modulation processing on the initial audio signal, and the first sound output module includes a plurality of ultra-high frequency first speakers arranged in an array, and the first speakers emit ultrasonic waves according to the first audio signal to form a spatial stereo field and enhance the audio playback effect.

Description

Technical Field

[0001] The present disclosure relates to the technical field of audio playback, and in particular includes a sound output device and a projector including the sound output device. Background Art

[0002] Current projectors are relatively small, and their built-in speakers are typically integrated with the optical engine and other components within a single housing, resulting in multiple speakers forming a composite point sound source. However, this point sound source fails to fully reproduce the surface and overhead spatial sound fields of stereo surround sound, Dolby 5.1 (including Atmos) / Digital Theater System (DTS), and the resulting poor sound quality. Summary of the Invention

[0003] The present disclosure relates to a sound output device and a projector, which can realize a spatial stereo sound field and enhance the sound playback effect.

[0004] In the first aspect, the present disclosure relates to a sound output device, comprising an audio processing module and at least one first sound output module. The audio processing module is used to receive an initial audio signal and perform frequency division processing and modulation processing on the initial audio signal to output a first audio signal. The first sound output module comprises a substrate and a plurality of first speakers, and the plurality of first speakers are arranged in an array on the substrate. The plurality of first speakers are ultra-high frequency speakers. The plurality of first speakers emit ultrasonic waves according to the first audio signal. The above-mentioned design converts the initial audio signal into a first audio signal and outputs it to the first sound output module by performing frequency division processing and modulation processing on the initial audio signal, and the first sound output module comprises a plurality of ultra-high frequency first speakers arranged in an array, and the first speakers emit ultrasonic waves according to the first audio signal to form a spatial stereo field and enhance the audio playback effect.

[0005] According to some embodiments of the present application, the audio processing module includes a frequency division unit, a modulation unit, and a first power amplifier. The frequency division unit is configured to receive an initial audio signal and perform frequency division processing to output a first target audio signal and a second target audio signal. The modulation unit is configured to generate a modulated wave based on the first target audio signal. The first power amplifier is configured to amplify the modulated wave to output the first audio signal. The above design, through the frequency division unit, the modulation unit, and the first power amplifier, achieves the conversion of an ultra-high frequency signal from the initial audio signal.

[0006] According to some embodiments of the present application, the first power amplifier is a digital power amplifier, and the audio processing module further includes a filtering unit configured to filter the signal output by the first power amplifier to output the first audio signal to the first speaker. The above design utilizes a pulse width modulation method by the modulation unit to pulse-width modulate the ultra-high frequency square wave pulse signal using the first target audio signal as the modulation signal, thereby generating a first audio signal with a shorter wavelength and greater directivity.

[0007] According to some embodiments of the present application, the audio processing module further includes an ultra-high frequency signal generating unit configured to provide a carrier wave, and a modulation unit configured to generate a modulated wave based on the carrier wave and the first target audio signal. In this design, the modulation unit modulates the first target audio signal using amplitude modulation to generate a first audio signal with a shorter wavelength and greater directivity.

[0008] According to some embodiments of the present application, the sound output device also includes a second sound output module, the second sound output module includes at least one second speaker, and the second speaker is a full-range speaker or a mid-low frequency speaker. The audio processing module also includes a second power amplifier, and the second power amplifier is used to amplify the second target audio signal to output a second audio signal. The second speaker emits mid-low frequency sound waves according to the second audio signal. The above design is to set a second sound output module in the sound output device to output mid-low frequency sound waves or full-frequency sound waves, and when the mid-low frequency sound waves or full-frequency sound waves are superimposed with ultrasonic waves, the sound range experienced by the user is wider.

[0009] According to some embodiments of the present application, the sound output device further includes a body, the first sound output module being movably connected to the body, and the first sound output module being retractable and / or rotatable relative to the body. This design, through the movably connected first sound output module to the body, allows the first sound output module to more flexibly reflect ultrasonic waves to the location of a reflection point, thereby facilitating the reflection of the ultrasonic waves through the reflection point to the area where the user is located.

[0010] According to some embodiments of the present application, a plurality of first speakers are arranged in a straight line to form at least one linear array disposed on the substrate. The above design forms a linear array through the plurality of first speakers to further enhance the directivity of the ultrasonic wave.

[0011] According to some embodiments of the present application, a plurality of linear arrays are formed into an array surface disposed on a substrate, and the array surface can be any of a rectangular array surface, a circular array surface, or a polygonal array surface. The above design forms a variety of array surfaces using a plurality of linear arrays, making the first sound output module applicable to a wider range of devices with different structures.

[0012] According to some embodiments of the present application, a plurality of first speakers are arranged adjacent to each other to form an array surface. Furthermore, the distance between each two adjacent first speakers is less than half the wavelength of the highest frequency within the operating frequency band of the ultrasonic wave output by the first sound output module; and the length of the array surface is greater than half the wavelength of the lowest frequency within the operating frequency band of the ultrasonic wave output by the first sound output module. This design, by limiting the distance between adjacent first speakers and the length of the array surface so that the array surface forms a linear array sound source, can further concentrate the ultrasonic wave output by the first sound output module into a very narrow radiation range based on the high directivity of the original ultrasonic wave, thereby extending the radiation distance.

[0013] According to some embodiments of the present application, the amplitude, frequency and phase of the plurality of first speakers provided on the same first sound output module are the same. The above design can further reduce the attenuation during the sound transmission process.

[0014] According to some embodiments of the present application, the sound output device further includes an angle adjustment module. The base plate is connected to the main body via the angle adjustment module, enabling the first sound output module to extend and / or rotate relative to the main body. This design utilizes the angle adjustment module to flexibly adjust the position of the first sound output module relative to the main body, thereby better directing the ultrasonic waves emitted by the first sound output module toward the location of the reflection point.

[0015] According to some embodiments of the present application, the sound output device further includes a sound adjustment module. The angle adjustment module is further configured to adjust the distance between the first sound output module and the reflection point. The sound adjustment module is electrically connected to the first speaker and the second speaker to adjust the volume of the sound output by the first speaker and the second speaker. The above design, through the cooperation of the angle adjustment module and the sound adjustment module, better achieves a surround sound field.

[0016] In a second aspect, the present disclosure further relates to a projector, comprising the sound output device as described in any one of the above items.

[0017] According to some embodiments of the present application, the number of the at least one first sound output module is at least two, wherein the two first sound output modules are respectively disposed on two sides of the body.

[0018] According to some embodiments of the present application, the number of at least one first sound output module is at least four, with two first sound output modules disposed on either side of an end of the projector body closer to the projection surface, and two first sound output modules disposed on either side of an end of the projector body farther from the projection surface. By integrating multiple first sound output modules within the same projector, this design achieves an expanded sound field for each channel, enhancing stereo, surround, and spatial sound, while also achieving audio-visual synchronization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 It is a functional block diagram of a sound output device in an embodiment provided by the present disclosure.

[0021] Figure 2 It is a schematic diagram of different sound wave radiation when the same speaker outputs low frequency, medium frequency or high frequency.

[0022] Figure 3 This is a schematic diagram of the reflection of sound waves of different frequencies on a reflecting surface of the same roughness.

[0023] Figure 4 is used Figure 1 The waveform diagram of the first target audio signal, the duty cycle signal and the PWM wave when the sound output device processes the initial audio signal is shown.

[0024] Figure 5 It is a functional block diagram of a sound output device in another embodiment provided by the present disclosure.

[0025] Figure 6 is used Figure 5 The figure shows waveforms of a first target audio signal, a carrier wave and an amplitude modulation wave when the sound output device processes an initial audio signal.

[0026] Figure 7 It is a structural diagram of a sound output device in an embodiment provided by the present disclosure.

[0027] Figure 8a is a schematic diagram of a line array on a first sound output module in an embodiment provided by the present disclosure; Figure 8b yes Figure 8a Schematic diagram of the radiation direction of the line array when radiating sound waves.

[0028] Figure 9 It is a schematic diagram of the array surface on the first sound output module in other embodiments provided by the present disclosure.

[0029] Figure 10 This is a schematic diagram of a corresponding spatial stereo field formed by a sound output device in an embodiment provided by the present disclosure in a first scenario.

[0030] Figure 113 is a schematic diagram of a corresponding spatial stereo field formed by a sound output device in an embodiment provided by the present disclosure in a second scenario.

[0031] Figure 12 It is a schematic diagram of a corresponding spatial stereo field formed by a sound output device in an embodiment provided by the present disclosure in a third scenario.

[0032] Figure 13 It is a schematic diagram of a spatial stereo field formed by a sound output device in another embodiment provided by the present disclosure.

[0033] Description of main component symbols

[0034] Sound output device 100 / 100a; audio processing module 10 / 10a; frequency division unit 101; modulation unit 102 / 102a;

[0035] First power amplifier 103; filter unit 104; second power amplifier 105; ultra-high frequency signal generating unit 106;

[0036] First sound output module 20; first speaker 21; substrate 22; second sound output module 30; second speaker 31;

[0037] DSP chip 40; main body 50; angle adjustment module 60.

[0038] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0040] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly attached to the other component or there may be a central component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be a central component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0041] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0042] Current projectors are relatively small, and their built-in speakers are typically integrated with components such as the optical engine within a single housing. This limits the number of speakers and their spacing. Furthermore, the frequency range of sound waves emitted by each speaker is generally within the 20Hz-20kHz range, making it difficult to expand the sound field. When the viewer is far from the projector, the multiple speakers within the housing can function as a composite point sound source. However, this point sound source sound field cannot reproduce stereo surround music, the surface sound field of Dolby 5.1 (including Atmos) / Digital Theater System (DTS), or the overhead spatial sound field, significantly limiting the projector's audio playback quality. Therefore, users often purchase separate multi-channel speakers and place them in different locations in the room to expand the surround sound field and create a spatial stereo sound field. However, these speakers, independent of the projector, are difficult to adjust to the optimal reflection point based on the user's position, resulting in varying audio playback quality depending on the user's location within the room.

[0043] To do this, see Figure 1 The present application provides a sound output device 100 that can achieve a spatial stereo sound field and enhance the audio playback effect. The sound output device 100 includes, but is not limited to, short-throw projectors, long-throw projectors, smart speakers, and other electronic devices with sound output functions.

[0044] In the embodiment of the present application, the sound output device 100 includes an audio processing module 10 and at least one first sound output module 20. The audio processing module 10 is configured to receive an initial audio signal and perform frequency division and modulation processing on the initial audio signal to output a first audio signal to the first sound output module 20. The first sound output module 20 includes a plurality of first speakers 21, each of which is an ultra-high frequency speaker. The first speakers 21 emit ultrasonic waves in response to the first audio signal.

[0045] It is understandable that, on the one hand, when the audio signal vibrates from the speaker and pushes the air outward to form vibration propagation, the sound of different frequencies has different wavelengths. Relative to the structure size of the speaker sound source, the higher the frequency, the stronger the directionality of the sound (see Figure 2 ). The more directive the sound, the more obvious the sound field direction positioning in the auditory perception. Correspondingly, the stronger the sense of direction and layering of the stereo surround space ecological sound produced in different directions of multiple channels. For example, when the frequency of the sound is in the frequency range of 20Hz-20kHz, the directionality of the sound is poor, and it is difficult for users to feel the direction and layering of the sound. The frequency of ultrasonic waves is greater than 20kHz. For users, the direction of the sound field is more obvious in the auditory perception after self-demodulation and restoration, and it is easier to form a spatial stereo field.

[0046] On the other hand, the sound waves output by the speaker will be reflected when they encounter a reflective surface during propagation, and the reflection direction and energy of the sound waves will vary with the direction of the reflective surface and the surface roughness of the reflective surface. For example, please refer to Figure 3 , which is a schematic diagram of the reflection of sound waves of different frequencies encountering the same rough reflecting surface. Figure 3 It can be seen that for sound waves with a frequency of 100Hz, since its wavelength is much larger than the size of the notch on the reflective surface, the reflective surface can be regarded as a smooth surface for sound waves with a frequency of 100Hz, and will produce directional mirror total reflection; for sound waves with a frequency of 1kHz, since its wavelength is close to the size of the notch on the reflective surface, the sound waves with a frequency of 100Hz will produce diffuse non-directional diffuse reflection on the reflective surface; for sound waves with a frequency of 10kHz, since its wavelength is approximately 34mm, which is much smaller than the size of the notch on the reflective surface, the sound waves with a frequency of 10kHz will produce strong diffuse non-directional diffuse reflection on the reflective surface. In other words, the higher the frequency of the sound wave, the stronger the diffuse reflection will be for a reflective surface with the same degree of roughness. Therefore, taking the wall as the reflective surface as an example, since the size of the notch on the wall is much smaller than Figure 3 The size of the recess shown, so the higher the frequency of the sound wave, the more conducive it is to diffuse reflection in the space with the wall, so that more users can feel the spatial sense of the sound wave.

[0047] In this way, the sound output device 100 provided in the embodiment of the present application processes the original audio signal through the audio processing module 10 to output an ultra-high frequency first audio signal to the first speaker 21, so that the first speaker 21 emits ultrasonic waves, which can form a spatial stereo field and enhance the audio playback effect.

[0048] Please refer again Figure 1 In some embodiments, the audio processing module 10 includes a frequency division unit 101, a modulation unit 102 and a first power amplifier 103. The frequency division unit 101 is used to receive an initial audio signal for frequency division processing to output a first target audio signal and a second target audio signal. The frequency of the first target audio signal is greater than a preset threshold, and the frequency of the second target audio signal is less than or equal to the preset threshold. The specific value of the preset threshold can be set as needed. For example, in some embodiments, the first target audio signal is a high-frequency signal with a frequency greater than or equal to 2kHz, and the second target audio signal is a medium-low frequency signal with a frequency less than 2kHz.

[0049] The modulation unit 102 is used to generate a modulation wave according to the first target audio signal to modulate the frequency of the first target audio signal to an ultra-high frequency signal (e.g., a frequency in the range of 20kHz-80kHz). The first power amplifier 103 is used to amplify the modulation wave and output the first audio signal to the first sound output module 20.

[0050] In some embodiments, the modulation unit 102 uses a pulse width modulation (PWM) method to perform pulse width modulation on the ultra-high frequency square wave pulse signal using the first target audio signal as the modulation signal. Figure 4 That is, when the modulation unit 102 adopts the PWM modulation method, the modulation unit 102 converts the first target audio signal from an analog signal into a PWM wave with a similar waveform, i.e., a modulated wave, by outputting a high-frequency duty cycle signal. In this way, the first power amplifier 103 is also a corresponding digital power amplifier to perform corresponding power amplification processing on the PWM wave. The audio processing module 10 also includes a filtering unit 104 for filtering the signal output by the first power amplifier 103 to convert the PWM wave into a corresponding analog first audio signal and output it to the first speaker 21. In this way, the first speaker 21 emits ultrasonic waves according to the first audio signal.

[0051] Please refer again Figure 1 In some embodiments, the sound processing device 100 further includes a second sound output module 30. The second sound output module 30 includes at least one second speaker 31. The second speaker 31 can be a full-range speaker or a mid-low frequency speaker. Correspondingly, the audio processing module 10 further includes a second power amplifier 105 for amplifying the second target audio signal and outputting the second audio signal to the second speaker 31. The second speaker 31 emits mid-low frequency sound waves according to the second audio signal.

[0052] In some embodiments, the sound output device 100 may further include two audio processing modules 10, two first sound output modules 20 and two second sound output modules 30 for outputting sound signals of left and right channels respectively, which is conducive to better achieving left and right stereo expansion.

[0053] In some embodiments, the sound output device 100 further includes a digital signal processing (DSP) chip 40. The DSP chip 40 is configured to output the initial audio signal to the frequency division unit 101. It is understood that the frequency division unit 101 may be a frequency division processing chip or a circuit having a frequency division processing function. Similarly, the modulation unit 102 may also be a modulation processing chip or a circuit having a modulation processing function.

[0054] Please continue reading Figure 5The present application further provides a sound output device 100a, comprising an audio processing module 10a, at least one first sound output module 20, and at least one second sound output module 30. The structure of the sound output device 100a is substantially the same as that of the sound output device 100, except that the audio processing module 10a includes a modulation unit 102a and an ultra-high frequency signal generating unit 106.

[0055] Please refer to Figure 6 In an embodiment of the present application, the modulation unit 102a uses amplitude modulation to amplitude modulate the ultra-high frequency carrier signal using the first target audio signal as the modulation signal. The ultra-high frequency signal generating unit 106 is used to provide a carrier and output it to the modulation unit 102a. The frequency of the carrier is greater than 20kHz, and the type of the carrier can be a sine wave, a square wave, or a triangle wave. For example, the frequency of the carrier can be in the range of 20kHz-80kHz. In this way, the modulation unit 102a generates an amplitude modulated wave, i.e., a modulated wave, according to the carrier and the first target audio signal, and outputs the modulated signal to the first power amplifier 103 for amplification processing, so as to finally output the first audio signal to the first speaker 21.

[0056] It is understood that the amplitude modulation used by the modulation unit 102a can be double-sideband modulation (DSB), vestigial sideband modulation (VSB) or other amplitude modulation methods, and the present application does not limit the specific method of amplitude modulation.

[0057] In some embodiments, the audio processing module 10a includes two modulation units 102a for processing left and right channel signals respectively.

[0058] It will be appreciated that the above embodiment only illustrates a portion of the structure of the audio processing module 10 / 10a. In other embodiments, the audio processing module 10 / 10a may further include other electronic components to implement corresponding functions, thereby processing the initial audio signal into the first audio signal and the second audio signal. For example, in some embodiments, the audio processing module 10 / 10a may further include other filtering units for filtering out noise generated during the audio processing process.

[0059] It can be understood that in the sound output device 100 (100a), the initial audio signal is modulated into an ultra-high frequency first audio signal by the audio processing module 10 (10a), and the first speaker 21 emits ultrasonic waves according to the first audio signal. In this way, the sound signal output by the first sound output module 20 has stronger directionality and shorter wavelength, which is more conducive to directional propagation and forms a spatial stereo field.

[0060] Please continue reading Figure 7 In some embodiments, the structure of the sound output device 100 / 100a is further described by taking the sound output device 100 / 100a as a projector as an example.

[0061] In some embodiments, the sound output device 100 / 100a further includes a body 50. The first sound output module 20 is movably connected to the body 50, and the first sound output module 20 is retractable and / or rotatable relative to the body 50, so that the plurality of first speakers 21 output ultrasonic waves to reflection points, which are then reflected by the reflection points to the area where the user is located.

[0062] Please continue reading Figure 8a The first sound output module 20 further includes a substrate 22. A plurality of first speakers 21 are arranged in an array on the substrate 22. For example, in some embodiments, the plurality of first speakers 21 are arranged in a straight line to form at least one line array. Since the directivity of the line array in the vertical coverage plane is a narrow beam (see FIG. Figure 8b ), and the energy of the sound waves output by several first speakers 21 can be superimposed to achieve long-distance radiation, further enhancing the directionality of the ultrasonic wave.

[0063] Furthermore, in some embodiments, multiple first speakers 21 provided on the same first sound output module 20 operate simultaneously to output sound signals, and the multiple first speakers 21 have the same amplitude, the same frequency, and the same phase. This can further reduce the attenuation during sound transmission.

[0064] Please refer to Figure 9 In some embodiments, several first speakers 21 are closely adjacently arranged on the substrate 22 to form several linear arrays, and the linear arrays form an array plane. For example, in some embodiments, in the first sound output module 20, the distance d between two adjacent first speakers 21 is less than half the wavelength of the highest frequency within the operating frequency band of the ultrasound waves output by the first sound output module 20. In some embodiments, the distance d between two adjacent first speakers 21 can be the distance between the two distal ends of the two adjacent first speakers 21; in other embodiments, the distance d between two adjacent first speakers 21 can also be the distance between the acoustic centers of the two adjacent first speakers 21. In some embodiments, the length L of the array plane formed by the several first speakers 21 is greater than half the wavelength of the lowest frequency within the operating frequency band of the ultrasound waves output by the first sound output module 20. In this way, the array plane formed by the several first speakers 21 can constitute a linear array sound source. Based on the high directivity of the original ultrasound waves, it can further concentrate the ultrasound waves output by the first sound output module 20 into a very narrow radiation range, thereby extending the radiation distance.

[0065] In some embodiments, the plurality of line arrays form a rectangular array surface. In other embodiments, the plurality of line arrays formed by the plurality of first speakers 21 may form array surfaces of other shapes. For example, in some embodiments, the array surface may be a circular array surface or another polygonal array surface. This allows the first sound output module 20 to adapt to different sound output device 100 / 100a configurations, flexibly adjusting the shape of the array surface on the first sound output module 20 and making it suitable for a wider range of devices with different configurations.

[0066] Please refer again Figure 7 In some embodiments, the sound output device 100 / 100a further includes an angle adjustment module 60. The base plate 22 is connected to the main body 50 via the angle adjustment module 60, so that the first sound output module 20 can be retracted and / or rotated relative to the main body 50. This allows the first sound output module 20 to emit ultrasonic waves to a reflection point, which then reflects the ultrasonic waves toward the user's location via the reflection point, thereby providing the user with a spatial sense of sound.

[0067] In some embodiments, the angle adjustment module 60 may include a hinge and / or a drive motor. The angle adjustment module 60 can extend or rotate the first sound output module 20 relative to the body 50 during use, and retract when use is complete, allowing the first sound output module 20 to be retracted within the body 50. In some embodiments, the angle adjustment module 60 can be manually controlled to cause the first sound output module 20 to emit ultrasonic waves to a reflection point. In other embodiments, the angle adjustment module 60 can be automatically controlled to cause the first sound output module 20 to emit ultrasonic waves to a reflection point through a remote control.

[0068] In some embodiments, a camera (not shown) is provided on the sound output device 100 / 100a, which captures an image including the user, processes the image through a processing chip (not shown) inside the sound output device 100 / 100a, obtains the user's position, and controls the angle adjustment module 60 according to the position to drive the first sound output module 20 to extend and / or rotate, so that the first sound output module 20 has an optimal orientation, thereby improving the user's acoustic experience.

[0069] In some embodiments, the substrate 22 may be a printed circuit board (PCB).

[0070] It is understood that in some embodiments, the sound output device 100 / 100 a further includes a processor, an optical engine (not shown), etc. The processor, the optical engine, the second sound output module 30 , and the DSP chip 40 are all housed in the body 50 .

[0071] It will be appreciated that in some embodiments, the processor may calculate the reflection point based on the user's location and control an indicator module (e.g., an indicator light emitting a first color) within the sound output device 100 / 100a to indicate the location of the reflection point. The first sound output module 20 is also provided with a corresponding indicator module (e.g., an indicator light emitting a second color) to indicate the direction of the ultrasonic wave emitted by the first sound output module 20. Thus, when the light spots emitted by the two indicator lights overlap, it can be assumed that the direction of the ultrasonic wave emitted by the first sound output module 20 is pointing toward the reflection point.

[0072] It is understood that the present application does not limit the number or size of the first speakers 21 on the first sound output module 20. For example, in some embodiments, when the sound output device 100 / 100a is used in a common environment and the reflection point is close to the first sound output module 20, a smaller first speaker 21 can be used based on the principle of diffuse reflection of sound waves. This allows the ultrasonic waves emitted by the first speaker 21 to produce more diffuse reflections, which helps more users experience the spatial sense of the ultrasonic waves.

[0073] In some embodiments, the sound output device 100 ( 100 a ) further includes a sound adjustment module (not shown). The sound adjustment module is electrically connected to the first sound output module 20 and the second sound output module 30 , and is used to adjust the volume of the sound output by the first speaker 21 of the first sound output module 20 and the second speaker 31 of the second sound output module 30 .

[0074] It is understood that the present application does not limit the number of the first sound output modules 20 on the sound output device 100 (100a). For example, please continue to refer to Figure 10-12 In some embodiments, the number of the first sound output modules 20 on the sound output device 100 (100a) is 2, and the two first sound output modules 20 are respectively disposed on both sides of the body 50. For another example, see Figure 13 In other embodiments, the number of the first sound output modules 20 on the sound output device 100 (100a) is 6. Two of the first sound output modules 20 are respectively arranged on both sides of an end of the body 50 close to the projection surface S, and the other two first sound output modules 20 are respectively arranged on both sides of an end of the body 50 away from the projection surface S, one is arranged on a position close to the light source on the body 50, and the other is arranged above the body 50 of the sound output device 100 (100a).

[0075] It is understood that the sound output device 100 (100a) provided in the present application can be applied to a variety of application scenarios to form different spatial stereo fields. In other embodiments, the number of the first sound output modules 20 can also be more than two, wherein two Figure 10 The arrangement shown is as shown, and the remaining first sound output modules 20 are added at other locations according to the scene requirements. The following will take four scenes as examples to illustrate the spatial stereo field formed by the sound output device 100 (100a).

[0076] See also Figure 10 , Figure 10 The figure shows a schematic diagram of a spatial stereo field formed by the sound output device 100 (100a) in a closed space in the first scenario. In the first scenario, the sound output device 100 (100a) positions the reflection point A1 and the reflection point A2 above the space, such as on the ceiling, through the processor. In this way, the positions of the two first sound output modules 20 are adjusted by the angle adjustment module 60 to point the two first sound output modules 20 to the corresponding reflection point A1 and reflection point A2, respectively. The processor controls the second speaker 31 of the second sound output module 30 to emit low-frequency sound waves or full-frequency sound waves. The processor also simultaneously controls the first speakers 21 on the two first sound output modules 20 to respectively emit ultrasonic waves to the corresponding reflection point A1 and reflection point A2, so as to reflect the ultrasonic waves to the area where the user is located via the reflection point A1 and reflection point A2, so as to expand the sky sound field of the space, thereby forming a surround space stereo field. Furthermore, the user can also adjust the distance between the first sound output module 20 and the reflection point A1 (reflection point A2) through the angle adjustment module 60, and control the processor to adjust the volume of the sound output by the first speaker through the sound adjustment module to enhance the surround spatial stereo field and improve the user experience.

[0077] See also Figure 11 In the second scenario, the sound output device 100 (100a) uses the processor to position the reflection point B1 on the left side of the space, such as on the left wall, and positions the reflection point B2 on the right side of the space, such as on the right wall. In this way, the angle adjustment module 60 and the sound adjustment module perform similar operations as in the first scenario, and in the second scenario, the left and right rear surround sound fields relative to the sound output device 100 (100a) can be expanded to form a spatial surround sound field.

[0078] See also Figure 12 In the third scenario, the sound output device 100 (100a) positions the reflection point C1 at the left front side of the space, for example, the left side of the projection surface S, and positions the reflection point C2 at the right front side of the space, for example, the right side of the projection surface S, through the processor. In this way, by performing operations similar to those in the first scenario through the angle adjustment module 60 and the sound adjustment module, the left and right front surround sound fields relative to the sound output device 100 (100a) can be expanded in the third scenario to form a spatial surround sound field.

[0079] See also Figure 13 ,exist Figure 13 In the fourth scenario shown, the sound output device 100 (100a) can be applied to multi-channel 7.1 or 8.0 expansion. The sound output device 100 (100a) uses a processor to position the reflection point D1 at the left front side of the space, such as the left side of the projection surface S; positions the reflection point D2 directly in front of the space, such as the center of the projection surface S; positions the reflection point D3 at the right front side of the space, such as the right side of the projection surface S; positions the reflection point D4 at the right side of the space, such as the right wall; positions the reflection point D5 at the left side of the space, such as the left wall; and positions the reflection point D6 at the upper rear side of the space relative to the sound output device 100 (100a), such as the ceiling. The ultrasonic wave outputted by the first sound output module 20 on the left front side of the sound output device 100 (100a) is a front left channel signal, and the ultrasonic wave is emitted to the reflection point D1; the ultrasonic wave outputted by the first sound output module 20 on the right front side of the sound output device 100 (100a) is a front right channel signal, and the ultrasonic wave is emitted to the reflection point D3; the ultrasonic wave outputted by the first sound output module 20 arranged near the light source on the sound output device 100 (100a) is a center channel signal, and the ultrasonic wave is emitted to the reflection point D2; the ultrasonic wave outputted by the first sound output module 20 on the left rear side of the sound output device 100 (100a) is a rear left channel signal, and the ultrasonic wave is emitted to the reflection point D5; the ultrasonic wave outputted by the first sound output module 20 on the right rear side of the sound output device 100 (100a) is a rear right channel signal, and the ultrasonic wave is emitted to the reflection point D4; the ultrasonic wave outputted by the first sound output module 20 on the main body 50 is a sky channel signal, and the ultrasonic wave is emitted to the reflection point D6. In this way, by performing operations similar to those in the first scenario through the angle adjustment module 60 and the sound adjustment module, the stereo surround sound field relative to the sound output device 100 (100a) can be expanded in the fourth scenario to form a spatial surround stereo sound field, so that the user can experience stereo, Dolby sound and DTS multi-channel sound field more strongly, and feel the synchronization of sound and picture more obviously.

[0080] It can be understood that in the fourth scenario, on the one hand, since the directionality of the mid- and low-frequency sound waves (full-frequency sound waves) emitted by the second sound output module 30 is not obvious, and the directionality of the ultra-high-frequency sound waves reflected by the wall is obvious, after the above two sound waves are superimposed, the sound range experienced by the user can be wider; on the other hand, since the sound field positioning width of each channel is expanded, the stereo, surround sound, and sky sound of the sound output device 100 (100a) are enhanced; on the third hand, due to the existence of the center channel reflected to the reflection point D2, the user can experience the sound waves emitted from the projection surface S, which enhances the sense of synchronization between sound and picture. In other embodiments, the number of the first sound output modules 20 can also be more than four, of which two, such as Figure 13 As shown in the arrangement, the remaining first sound output modules 20 are added at other locations according to scene requirements.

[0081] In summary, in the first aspect, the sound output device 100 (100a) provided in the present application converts the initial audio signal into a first audio signal by performing frequency division processing and modulation processing on the initial audio signal, and outputs the first audio signal to the first sound output module 20, and the first sound output module 20 includes a plurality of ultra-high frequency first speakers 21 arranged in an array. The first speakers 21 emit ultrasonic waves according to the first audio signal to form a spatial stereo field and enhance the audio playback effect.

[0082] Secondly, the sound output device 100 (100a) provided by the present application is arranged on the first sound output module 20 in an array with a plurality of first speakers 21, and the distance d between each two adjacent first speakers 21 is less than half the wavelength of the highest frequency within the operating frequency band of the ultrasonic wave output by the first sound output module 20. The length L of the array surface formed by the plurality of first speakers 21 is greater than half the wavelength of the lowest frequency within the operating frequency band of the ultrasonic wave output by the first sound output module 20. In this way, the emitted ultrasonic wave is more concentrated, thereby further improving the directivity of the sound wave.

[0083] Thirdly, the sound output device 100 (100a) provided in the present application integrates multiple first sound output modules 20 to achieve expansion of the sound field of each channel, so that stereo, surround and spatial sound are all enhanced, and sound and picture synchronization is achieved at the same time.

Claims

1. A sound output device, characterized in that: The sound output device comprises: an audio processing module, configured to receive an initial audio signal, and perform frequency division processing and modulation processing on the initial audio signal to output a first audio signal; at least one first sound output module, the first sound output module comprising a substrate and a plurality of first speakers, the plurality of first speakers being arranged in an array on the substrate, the plurality of first speakers being ultra-high frequency speakers, and the plurality of first speakers emitting ultrasonic waves to a reflection point according to the first audio signal; A sound adjustment module, configured to adjust the volume of the sound output by the first speaker; an angle adjustment module, configured to adjust the distance between the first sound output module and the reflection point; In which, the sound output device also includes a processor, a first indication module and a second indication module, the second indication module is arranged on the first sound output module, and the processor adjusts the volume of the sound output by the first speaker and the radiation distance of the first speaker through the sound adjustment module, while also adjusting the distance between the first sound output module and the reflection point through the angle adjustment module; the first indication module is used to emit a first light spot to indicate the position of the reflection point, and the second indication module is used to emit a second light spot to indicate the position where the ultrasonic wave emitted by the first sound output module points.

2. The sound output device according to claim 1, wherein The audio processing module includes: a frequency division unit, configured to receive the initial audio signal and perform frequency division processing to output a first target audio signal and a second target audio signal; a modulation unit, configured to generate a modulation wave according to the first target audio signal; The first power amplifier is used to amplify the modulated wave to output the first audio signal.

3. The sound output device according to claim 2, wherein: The first power amplifier is a digital power amplifier, and the audio processing module further includes a filtering unit, which is configured to filter the signal output by the first power amplifier to output the first audio signal to the first speaker.

4. The sound output device according to claim 2, wherein: The audio processing module further includes an ultra-high frequency signal generating unit, which is configured to provide a carrier wave. The modulation unit generates the modulated wave according to the carrier wave and the first target audio signal.

5. The sound output device according to claim 2, wherein: The sound output device also includes a second sound output module, which includes at least one second speaker, and the second speaker is a full-range speaker or a mid-low frequency speaker. The audio processing module also includes a second power amplifier, which is used to amplify the second target audio signal to output a second audio signal. The second speaker emits mid-low frequency sound waves according to the second audio signal.

6. The sound output device according to claim 1, wherein: The sound output device further includes a body, the first sound output module is movably connected to the body, and the first sound output module is retractable and / or rotatable relative to the body.

7. The sound output device according to claim 1, wherein: A plurality of the first speakers are arranged in a straight line to form at least one linear array disposed on the substrate.

8. The sound output device according to claim 7, characterized in that A plurality of line arrays form an array surface disposed on the substrate, and the array surface can be any one of a rectangular array surface, a circular array surface or a polygonal array surface.

9. The sound output device according to claim 1, wherein: Several first speakers are arranged adjacent to each other to form an array surface, and the distance between every two adjacent first speakers is less than half the wavelength of the highest frequency within the working frequency band of the ultrasound output by the first sound output module; the length of the array surface is greater than half the wavelength of the lowest frequency within the working frequency band of the ultrasound output by the first sound output module.

10. The sound output device according to claim 1, wherein The amplitude, frequency and phase of the plurality of first speakers arranged on the same first sound output module are the same.

11. The sound output device according to claim 6, wherein: The base plate is connected to the body through the angle adjustment module, so that the first sound output module can be extended and / or rotated relative to the body.

12. A projector, characterized in that: The projector includes the sound output device according to any one of claims 1 to 11.

13. The projector according to claim 12, wherein: The sound output device further includes a body, the first sound output module is movably connected to the body, and there are at least two first sound output modules, wherein two first sound output modules are respectively arranged on both sides of the body.

14. The projector according to claim 13, wherein: The number of the first sound output modules is at least four, wherein at least two of the first sound output modules are respectively arranged on both sides of an end of the body close to the projection surface, and at least two of the first sound output modules are respectively arranged on both sides of an end of the body away from the projection surface.

Images