A frequency division multi-unit integrated photo frame sound box

Abstract

The utility model discloses a kind of frequency division formula multi-unit integrated photo frame sound box, comprising: photo frame, decorative canvas, control circuit and backplate, backplate is fixed on the back of photo frame, decorative canvas clamping is fixed between backplate and photo frame, high-frequency playback unit is fixed symmetrically in the left and right frame of photo frame;High-frequency playback unit includes at least one high-frequency loudspeaker;Low-frequency playback unit includes low-frequency loudspeaker and low-frequency resonance cavity;Air pipe mouth is equipped in low-frequency resonance cavity top surface, flow guide baffle is equipped in it, and low-frequency resonance cavity is divided into breathing air pipe cavity and low-frequency resonance chamber;Low-frequency loudspeaker is fixed on the back cavity wall of low-frequency resonance chamber;High-frequency loudspeaker and low-frequency loudspeaker are electrically connected in control circuit respectively.The utility model is through the innovative design of "zoning layout+exclusive low-frequency cavity+rotatable adaptation+internal magnetic loudspeaker", break through the technical bottleneck of traditional ultrathin decorative sound box, realize full-band sound effect balanced and low-frequency significantly enhanced.

Description

Technical Field

[0001] This utility model relates to the field of speaker equipment technology, specifically to a crossover multi-unit integrated picture frame speaker. Background Technology

[0002] With the increasing demand for integrated smart home and decoration solutions, framed speakers that combine decorative functions with superior sound quality are gradually becoming a market hotspot. Existing similar products (such as wall-mounted flat panel speakers and thin decorative speakers) typically employ ultra-thin designs to fit snugly against wall decorations; however, limited by their overall thickness (generally ≤5cm total thickness, ≤3cm speaker body thickness), their low-frequency sound effects suffer from significant deficiencies.

[0003] On the one hand, traditional speakers rely on cavity structures to amplify low-frequency signals, but ultra-thin designs result in limited internal space, making it difficult to accommodate independent low-frequency resonant cavities. Existing technologies mostly enhance bass through resonance principles (such as a vibrator driving a resonant plate or decorative canvas to vibrate) or simple anti-reflection space reflection. However, such solutions can only achieve passive low-frequency enhancement and lack dedicated cavity designs for the 20-200Hz low-frequency range, resulting in insufficient low-frequency depth, weak bass quantity, and poor reverberation. For example, the wall-mounted flat panel speaker disclosed in CN211860454U enhances bass through a combination of "vibrator + honeycomb panel + anti-reflection space," but its anti-reflection space thickness is only 0.1-1cm, and it relies on soft material resonance, resulting in limited low-frequency amplification efficiency, especially prone to nonlinear distortion at high volumes.

[0004] On the other hand, existing solutions often involve a mixed distribution of high-frequency and low-frequency drivers, lacking clear physical partitioning. For example, planar speakers (high / mid-frequency) and resonant drivers (mid / low-frequency) are often placed in the same cavity, causing low-frequency vibrations to easily interfere with high-frequency drivers, resulting in muddy sound quality and reduced clarity. Furthermore, the shared cavity in an ultra-thin structure cannot be acoustically optimized for different frequency bands (such as high-frequency diffusion and low-frequency resonance), further limiting the balanced performance of the entire frequency range.

[0005] Furthermore, existing technologies, in pursuit of thinness, often sacrifice cavity volume. Low-frequency sound effects are highly sensitive to cavity space—too small a volume results in short reflection paths for low-frequency sound waves, rapid energy attenuation, and an inability to form effective resonance. For example, the sound-reflecting system of a wall-mounted flat panel speaker needs to balance the tension of the decorative surface layer with the overall thickness, making it difficult to precisely adjust the low-frequency response through structural design (such as the bass reflex port and cavity shape), resulting in weak bass performance that fails to meet users' demands for high-quality audio. Utility Model Content

[0006] To address the aforementioned issues, the technical objective of this utility model is to provide a crossover multi-unit integrated frame speaker. By setting an independent low-frequency resonance cavity in the middle of the back and dividing the high-frequency speaker and low-frequency speaker unit into separate sections, the contradiction between ultra-thin design and low-frequency enhancement is effectively resolved, significantly improving low-frequency sound effects and reverberation, while also possessing both decorative and acoustic properties.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] A multi-unit integrated frame speaker with crossover design includes: a frame, a decorative canvas, a control circuit, and a back panel. The back panel is fixed to the back of the frame, and the edge of the decorative canvas is clamped and fixed between the back panel and the frame's edge. A high-frequency sound unit and a low-frequency sound unit are disposed on the side of the back panel away from the decorative canvas. Two high-frequency sound units are disposed, respectively fixed to the left and right edges of the frame. One low-frequency sound unit is disposed on the back of the frame, located between the two high-frequency sound units, and fixed to the frame's edge or other suitable position. The high-frequency sound unit... The unit includes at least one high-frequency loudspeaker; the low-frequency sound reproduction unit includes a low-frequency loudspeaker and a low-frequency resonant cavity; the low-frequency resonant cavity is a rectangular hollow cavity with a duct opening on its top surface; a flow guide baffle is provided inside the low-frequency resonant cavity, the flow guide baffle extends downward from the duct opening, dividing the low-frequency resonant cavity into a breathing air duct cavity and a low-frequency resonant chamber; the top of the breathing air duct cavity is connected to the duct opening, and its bottom is connected to the low-frequency resonant chamber; the low-frequency loudspeaker is fixed to the rear cavity wall of the low-frequency resonant chamber; the high-frequency loudspeaker and the low-frequency loudspeaker are respectively electrically connected to a control circuit.

[0009] Furthermore, the air duct opening of the aforementioned breathing air duct is shaped like an upward-expanding horn, thereby increasing the outlet area of ​​the air duct and allowing for smoother airflow, effectively reducing airflow resistance. During low-frequency sound wave propagation, the airflow is relatively large; the horn opening prevents low-frequency attenuation caused by poor airflow, enhancing low-frequency sound output and improving the overall low-frequency performance of the speaker, making the sound more powerful and full. In addition, the horn opening allows the speaker to output a larger volume at the same input power, improving the speaker's energy conversion efficiency, reducing energy consumption, and conforming to the design concept of energy conservation and environmental protection.

[0010] Furthermore, the high-frequency sound reproduction unit also includes a high-frequency speaker housing, which is fixed to the frame of the picture frame. At least one high-frequency speaker is installed inside the high-frequency speaker housing. The left and right sides of the picture frame are provided with first high-frequency sound reproduction windows corresponding to the high-frequency speakers, and the first high-frequency sound reproduction windows face forward.

[0011] Furthermore, the top and bottom edges of the picture frame are pre-set with second high-frequency sound playback windows. When the picture frame needs to be rotated 90 degrees for hanging, the user can adjust the fixed position of the high-frequency sound playback unit to ensure that the two high-frequency sound playback units are located on the left and right sides of the rotated picture frame, respectively.

[0012] Furthermore, a decorative mesh is installed on the front of the frame's edge, covering both the first and second high-frequency sound output windows. This design protects the high-frequency speakers and enhances the aesthetics of the frame speaker enclosure.

[0013] Furthermore, the top surface of the low-frequency resonance chamber is provided with a wiring harness hole, through which the signal line of the low-frequency speaker passes and is electrically connected to the control circuit.

[0014] Furthermore, the circuit board of the control circuit is fixed to the outer wall of the low-frequency resonant cavity; the control circuit includes a wireless communication module, an audio decoding chip, a crossover, and a power management unit; the wireless communication module connects to external devices via Bluetooth 5.0 protocol, and is provided with a 3.3V regulated power supply by the power management unit. It transmits received audio data as digital signals to the digital input interface of the audio decoding chip, and transmits control signals to the control pins of the audio decoding chip via UART or USB protocol; the audio decoding chip receives signals from the wireless communication module, and the power management unit... The power management unit provides a 3.3V main power supply and a 1.8V core power supply, transmits analog audio signals to the crossover, and feeds back status signals to the power management unit. The crossover receives analog audio signals and crossover point calibration signals from the audio decoding chip, and is powered by 5V from the power management unit, outputting high-frequency signals to the high-frequency speaker and low-frequency signals to the low-frequency speaker. The power management unit connects to an external 12V power adapter to provide appropriate power to the wireless communication module, audio decoding chip, and crossover, and receives status feedback signals from the audio decoding chip and outputs power switch signals.

[0015] Furthermore, the picture frame speaker also includes a touch display circuit. A touch window is provided on the bottom surface of the picture frame, and the circuit board of the touch display circuit is mounted on the touch window. The touch display circuit includes a touch sensor, a touch display driver chip, and a display screen. The touch sensor is powered by the power management unit and transmits touch signals to the touch display driver chip via an I2C, SPI, or USB interface. The touch display driver chip receives the touch signals from the touch sensor and the system status information of the audio decoding chip, is powered by the power management unit, drives the display screen to display content, and transmits user operation signals to the audio decoding chip. The display screen receives the display data signals from the touch display driver chip and is powered by the power management unit to display information.

[0016] Furthermore, the top edge and one side of the back of the picture frame are respectively provided with mounting slots to facilitate mounting the picture frame speaker on the wall fixing nails.

[0017] Furthermore, both the high-frequency speaker and the low-frequency speaker are internal magnet type speakers. The parameters of the high-frequency speaker are 34mm*34mm, power 3W, and frequency range 2kHz to 20kHz; the parameters of the low-frequency speaker are 101mm*101mm, power 25W, and frequency range 20Hz to 2kHz.

[0018] The beneficial effects of this utility model are:

[0019] 1. Zonal crossover design and full-range sound optimization

[0020] Independent zone layout: High-frequency sound units are set on the left and right sides of the frame, and low-frequency sound units are set in the middle. This enables zoned processing and independent sound generation of high, medium and low frequency signals, avoiding interference from low-frequency vibrations to high-frequency units in traditional mixed layouts, and significantly improving the purity of sound quality.

[0021] Precise frequency band coverage: The high-frequency unit focuses on high-frequency signals from 2kHz to 20kHz, outputting clear and bright high frequencies; the low-frequency unit enhances the low-frequency band from 20Hz to 2kHz, solving the problems of insufficient low-frequency extension and weak bass in ultra-thin speakers, and achieving balanced performance across the entire frequency band.

[0022] 2. Dedicated low-frequency resonance cavity and optimized design

[0023] (1) Acoustic advantages of flared duct openings

[0024] Improved low-frequency response: The horn-shaped air duct on the top surface of the low-frequency resonance cavity expands the outlet area, reduces air resistance, avoids low-frequency attenuation, and increases the sound pressure level in the 20-80Hz frequency band, making the bass more impactful and full.

[0025] Reduce sound distortion: Guides airflow to flow smoothly and suppresses turbulence. Compared with conventional right-angle air duct outlets, it reduces non-linear distortion by 15% to 20%, ensuring accurate low-frequency signal reproduction and pure sound quality without noise.

[0026] Enhanced sound diffusion: The 30° to 45° flare angle allows low-frequency sound waves to radiate more widely, increasing the radiation angle by 25% compared to a straight nozzle, improving the uniformity of the sound field, and ensuring consistent low-frequency intensity at different locations.

[0027] Improve energy conversion efficiency: Optimize airflow path, increase sound energy output efficiency by 10% to 15% under the same input power, save energy and maintain sufficient volume.

[0028] (2) The flow guide baffle works in conjunction with the cavity

[0029] The internal baffle divides the "breathing air duct" and the "low-frequency resonance chamber" into a complete low-frequency enhancement link with the horn-shaped air duct, which increases the low-frequency amplitude by more than 20% and can reach a depth of less than 40Hz.

[0030] 3. Flexible layout that can be rotated and adapted

[0031] High-frequency sound output windows are reserved: the top and bottom edges of the frame have pre-set sound output windows, which can be adjusted by rotating 90° to maintain the position of the high-frequency sound output unit and maintain the symmetry of the sound field. At the same time, the symmetrical design of the horn and duct openings of the low-frequency resonance cavity ensures that the low-frequency diffusion angle is consistent regardless of whether it is installed horizontally or vertically, avoiding sound imbalance.

[0032] 4. Advantages of using internal magnet loudspeakers

[0033] Reduced electromagnetic interference: Both high-frequency and low-frequency speakers use internal magnet speakers, which have less magnetic field leakage and effectively reduce electromagnetic interference to surrounding equipment, making them suitable for environments with high electromagnetic compatibility requirements.

[0034] Compact and stable structure: The internal magnet speaker is smaller and more stable, which helps to further optimize the overall structural design while ensuring the sound quality of the speaker, and meets the space and stability requirements of the picture frame speaker.

[0035] 5. Integrated structure and user-friendly details

[0036] Integrated control circuit: The PCB board of the control circuit is fixed to the outer wall of the low-frequency resonant cavity, and the cavity structure is used for support, reducing additional installation space and improving the compactness of the internal layout.

[0037] Convenient mounting design: Mounting slots are provided on the top edge and any side of the back of the frame, supporting quick installation on wall-mounted nails in either horizontal or vertical directions, adapting to different decoration scenarios. The slot positions have been mechanically optimized to ensure mounting stability.

[0038] Modular design facilitates maintenance: Both the high-frequency speaker housing and the low-frequency resonant cavity are detachable and fixed, making it easy to replace the speaker or repair the control circuit later, thus reducing maintenance costs.

[0039] Summary of technical advantages

[0040] This invention breaks through the technical bottlenecks of traditional ultra-thin decorative speakers through an innovative design featuring "zoned layout + dedicated low-frequency cavity + rotatable adapter + internal magnet speaker". In terms of acoustic performance, it achieves balanced sound across the entire frequency range with significantly enhanced low frequencies; in terms of structural design, it balances compactness, stability, and flexibility; and in terms of user experience, it provides convenient installation and maintenance. Overall, it combines aesthetics with high sound quality, providing a comprehensive and groundbreaking solution for smart home decorative speakers. Attached Figure Description

[0041] Figure 1 This is an exploded structural diagram of the present invention.

[0042] Figure 2 This is a schematic diagram of the back structure of this utility model.

[0043] Figure 3 This is a schematic diagram of the layout of the high-frequency sound playback window on the picture frame.

[0044] Figure 4 This is a schematic diagram of the high-frequency sound reproduction unit.

[0045] Figure 5 This is a schematic diagram of the internal structure of the low-frequency playback unit.

[0046] Figure 6 This is a diagram showing the hardware module connections between the control circuit and the touch display circuit.

[0047] In the diagram: 100-Picture frame, 200-Decorative canvas, 300-Back panel, 400-High frequency sound unit, 500-Low frequency sound unit, 600-Circuit board for control circuit, 700-Circuit board for touch display circuit, 101-First high frequency sound window, 102-Second high frequency sound window, 103-Decorative cover, 104-Hanging slot, 401-High frequency speaker housing, 402-High frequency speaker, 501-Low frequency resonance cavity, 502-Low frequency speaker, 503-Air duct opening, 504-Air guide baffle, 505-Breathing air duct cavity, 506-Low frequency resonance chamber, 507-Wire harness hole, 601-Wireless communication module, 602-Audio decoding chip, 603-Crossover, 604-Power management unit, 701-Touch sensor, 702-Touch display driver chip, 703-Display screen. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0049] like Figure 1 and 2As shown in the figure, this embodiment describes a crossover-type multi-unit integrated picture frame speaker, which includes the following structural parts: picture frame 100, decorative canvas 200, back panel 300, high-frequency sound reproduction unit 400, low-frequency sound reproduction unit 500, control circuit board 600, and touch display circuit board 700. The specific structure and connection relationship between each part are as follows:

[0050] The picture frame 100 has a rectangular wooden frame, and the back of the back panel 300 is fixed to the top, bottom, left, and right edges of the frame by rotatable clips on the four sides of the frame. The decorative canvas 200 is located between the picture frame 100 and the back panel 300, and its four sides are clamped and fixed by the frame of the picture frame 100 and the back panel 300. The back panel 300 is made of high-density fiberboard.

[0051] like Figure 3 As shown, first high-frequency sound transmission windows 101 are symmetrically arranged on the inner sides of the left and right frames of the frame 100, and second high-frequency sound transmission windows 102 are symmetrically arranged on the inner sides of the top and bottom frames. A rectangular, removable, annular decorative mesh 103 (such as metal mesh or fabric mesh) is provided on the front panel of the frame 100, covering both the first and second high-frequency sound transmission windows 101 and 102. The mesh diameter is 1mm, and the sound transmission rate is ≥85%, which can protect the speaker from dust and foreign objects without affecting the diffusion of high-frequency signals. The back panel 300 does not cover the first and second high-frequency sound transmission windows 101 and 102.

[0052] A high-frequency sound unit 400 and a low-frequency sound unit 500 are provided on the side of the back panel 300 facing away from the decorative canvas 200. Two high-frequency sound units 500 are provided, fixed to the left and right edges of the frame 100 respectively; one low-frequency sound unit 500 is provided, located between the two high-frequency sound units 500, and fixed to the edge between the left and right edges of the frame 100. Specifically:

[0053] like Figure 4 As shown, the high-frequency sound reproduction unit 400 includes a high-frequency speaker housing 401 and two high-frequency speakers 402. The high-frequency speaker housing 401 is made of ABS engineering plastic and is fixed to the inner side of the left and right frames of the picture frame 100 with screws. The front surface of the housing is aligned with the two first high-frequency sound windows 101. The two high-frequency speakers 402 are 34mm × 34mm internal magnet speakers (parameters: power 3W, frequency range 2kHz-20kHz), fixed inside the high-frequency speaker housing 401. The two high-frequency speakers 402 are connected to the control circuit via signal lines.

[0054] Rotatable adapter design: When the picture frame 100 needs to be rotated 90° for hanging, the user can remove the fixing screws of the high frequency speaker box 401 and install it at the position of the second high frequency sound window 102 on the upper and lower frame to ensure that the high frequency unit is always located on the "left and right sides" (upper and lower sides after rotation) to maintain the symmetry of the sound field.

[0055] like Figure 5 As shown, the low-frequency sound unit 500 includes a low-frequency resonant cavity 501 and a low-frequency speaker 502. The low-frequency resonant cavity 501 has a rectangular hollow cavity structure with a horn-shaped air duct 503 on its top surface to guide airflow smoothly into and out of the cavity, improving low-frequency response. A baffle 504 is installed inside the cavity, extending downwards from the bottom of the air duct 503, dividing the cavity into a left "breathing air duct cavity 505" and a right "low-frequency resonant cavity 506." The bottom of the breathing air duct cavity 505 is connected to the low-frequency resonant cavity 506, forming an acoustic link of "intake-resonance-diffusion." The low-frequency speaker 502 is a 101mm×101mm internal magnet speaker (parameters: power 25W, frequency range 20Hz-2kHz), which is bolted to the rear wall (the side away from the back panel) of the low-frequency resonant cavity 506, with the diaphragm facing the inside of the cavity. The signal line of the low-frequency speaker 502 is led out through the wire harness hole 507 on the top surface of the cavity and connected to the control circuit.

[0056] The control circuit board 600 is fixed on the outer wall of the low-frequency resonance cavity 501.

[0057] Among them, the control circuit, such as Figure 6As shown, the device includes a wireless communication module 601, an audio decoding chip 602, a frequency divider 603, and a power management unit 604. The wireless communication module 601 connects to external devices via Bluetooth 5.0 and is supplied with a 3.3V regulated power supply by the power management unit 604. It transmits received audio data digitally to the digital input interface of the audio decoding chip 602 and transmits control signals to the control pins of the audio decoding chip 602 via UART or USB protocols. The audio decoding chip 602 receives signals from the wireless communication module 601 and is supplied with a 3.3V main power supply and a 1.8V core power supply by the power management unit 604, transmitting analog audio signals... The signal is sent to the frequency divider 603, which feeds back a status signal to the power management unit 604. The frequency divider 603 receives the analog audio signal and the frequency division point calibration signal (the frequency division point is set to 2kHz) from the audio decoding chip 602. The power management unit 604 provides 5V power to output the high-frequency signal (>2kHz) to the high-frequency speaker 402 and the low-frequency signal (≤2kHz) to the low-frequency speaker 502. The power management unit 604 is connected to an external 12V power adapter to provide appropriate power to the wireless communication module 601, the audio decoding chip 602 and the frequency divider 603. It also receives the status feedback signal from the audio decoding chip 602 and outputs a power switch signal.

[0058] A touch window is provided on the bottom surface of the picture frame 100, and the circuit board 700 of the touch display circuit is mounted on the touch window.

[0059] Among them, the touch display circuit, such as Figure 6 As shown, the device includes a touch sensor 701, a touch display driver chip 702, and a display screen 703. The touch sensor 701 is powered by a power management unit 604 and transmits touch signals to the touch display driver chip 702 via an I2C, SPI, or USB interface. The touch display driver chip 702 receives touch signals from the touch sensor 701 and system status information from the audio decoding chip 602, is powered by the power management unit 604, drives the display screen to display content, and transmits user operation signals to the audio decoding chip 602. The display screen 703 receives display data signals from the touch display driver chip 702 and is powered by the power management unit 604 to display information.

[0060] Several equally spaced hanging slots 104 are provided on the top edge and any side of the back of the picture frame 100, forming a semi-circular opening, to support horizontal or vertical hanging on wall fixing nails.

[0061] The working principle of this solution is as follows:

[0062] External devices transmit audio data via Bluetooth 5.0 protocol to audio decoding chip 602 through wireless communication module 601. The decoded analog audio signal is then transmitted to crossover 603. Crossover 603 outputs high-frequency signal (>2kHz) to high-frequency speaker 402 and low-frequency signal (≤2kHz) to low-frequency speaker 502 at a 2kHz crossover point. High-frequency speaker 402 is located at the first high-frequency sound window 101 inside the left and right sides of the frame 100 (it can be rotated and installed to the second high-frequency sound window 102 on the top and bottom sides by removing the screws to accommodate a 90° rotation of the frame and maintain sound field symmetry). Low-frequency speaker 502 is fixed in the low-frequency resonance chamber 506 of low-frequency resonance cavity 501. The rear cavity wall, where the low-frequency resonance cavity 501 is located, forms an "intake-resonance-diffusion" acoustic link through the air duct 503 and the guide baffle 504, improving the low-frequency response; when the high-frequency and low-frequency speakers emit sound, the sound diffuses through the decorative cover 103 (mesh diameter 1mm, sound transmission rate ≥85%) covering the first and second high-frequency sound emission windows 101 and 102; the touch sensor 701 of the touch display circuit receives the touch signal, which is processed by the touch display driver chip 702, drives the display screen 703 to display the content, and transmits the user operation signal to the audio decoding chip 602 to realize human-computer interaction; the power management unit 604 of the control circuit is connected to an external 12V power adapter to provide appropriate power to each unit.

[0063] The above embodiments fully demonstrate the core innovations of this utility model, such as zoned layout, low-frequency resonance cavity optimization, application of internal magnetic speaker, and rotatable adaptation. According to actual measurements, within a 5cm thick frame, the low-frequency extension depth can reach 45Hz, and the high-frequency distortion rate is ≤1%, meeting the dual needs of home decoration and high-quality audio.

[0064] It should be noted that, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0065] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A crossover-type multi-unit integrated frame speaker, comprising: A picture frame, a decorative canvas, a control circuit, and a back panel, characterized in that the back panel is fixed to the back of the picture frame, the edge of the decorative canvas is clamped and fixed between the back panel and the frame edge, and a high-frequency sound reproduction unit and a low-frequency sound reproduction unit are provided on the side of the back panel away from the decorative canvas; two high-frequency sound reproduction units are provided, respectively fixed to the left and right edges of the picture frame; one low-frequency sound reproduction unit is provided, located on the back of the picture frame and in the area between the two high-frequency sound reproduction units, and fixed to the frame edge of the back of the picture frame; the high-frequency sound reproduction unit includes at least one high-frequency speaker. The device includes a low-frequency speaker and a low-frequency resonant cavity. The low-frequency resonant cavity is a rectangular hollow cavity with a duct opening on its top surface. A flow guide baffle is provided inside the low-frequency resonant cavity, extending downward from the duct opening and dividing the low-frequency resonant cavity into a breathing air duct cavity and a low-frequency resonant chamber. The top of the breathing air duct cavity is connected to the duct opening, and its bottom is connected to the low-frequency resonant chamber. The low-frequency speaker is fixed to the rear wall of the low-frequency resonant chamber. The high-frequency speaker and the low-frequency speaker are electrically connected to the control circuit. The opening of the respiratory duct is shaped like an upward-expanding funnel. The high-frequency sound reproduction unit also includes a high-frequency speaker housing, which is fixed to the frame of the picture frame. At least one high-frequency speaker is installed inside the high-frequency speaker housing. The left and right sides of the picture frame are provided with first high-frequency sound reproduction windows corresponding to the high-frequency speakers, and the first high-frequency sound reproduction windows face forward.

2. The crossover multi-unit integrated frame speaker as described in claim 1, characterized in that, The top and bottom edges of the frame are pre-set with a second high-frequency sound playback window.

3. A crossover-type multi-unit integrated frame speaker as described in claim 2, characterized in that, A decorative mesh is installed on the front of the frame, which covers the first high-frequency sound playback window and the second high-frequency sound playback window.

4. A crossover-type multi-unit integrated frame speaker as described in claim 1, characterized in that, The back of the picture frame is provided with a mounting slot on the top edge and one side edge respectively.

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