Wire fixing structure of infant anti-winding sound transmission toy

Abstract

The invention relates to the technical field of educational toys for children, and discloses a wire fixing structure of an anti-winding sound transmission toy for children, comprising: a cavity mechanism used as a receiving main body; the cavity mechanism comprises a resonant cavity, the inner wall of the resonant cavity is provided with a plurality of sound wave reflection salient points, the sound wave reflection salient points are distributed in an array at equal intervals, the outer part of the cavity mechanism is provided with convex anti-skid lines, the bottom of the resonant cavity is provided with an edge plate, the bottom of the resonant cavity is provided with a cross-shaped wire slot, and the cross-shaped wire slot is provided with a plurality of convex anti-skid lines. The bottom of the resonant cavity is provided with a battery, the outer wall of the resonant cavity is provided with a USB-C charging interface, and the bottom of the resonant cavity is provided with an intelligent interaction assembly. The safety and the holding comfort of the toy are improved, long-distance audio transmission and multi-mode feedback are realized, the interactive experience of children is optimized, and the system response capability is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of children's educational toys, in particular to a wire fixing structure of an anti-entanglement sound-transmitting toy for infants. Background Art

[0002] Existing paper cup sound transmission products mostly use paper or ordinary plastic as the transmission medium. In high-humidity environments (relative humidity exceeding 70%), sound waves are easily absorbed or scattered by the inner walls of the structure during transmission, resulting in significant sound attenuation. This decrease in transmission efficiency is particularly common during the rainy season in southern China or when children are playing outdoors, and can become a major obstacle in practical use.

[0003] From a service life perspective, most similar products on the market utilize single-layer plastic casings and low-quality wiring. These structures can quickly become fatigued by children, who frequently drop and tug on them. Based on average daily usage by children, some products experience cracking, broken wiring, or loosening within 120 hours, clearly failing to meet the basic durability requirements for everyday companion toys.

[0004] There are also significant issues with ergonomic design. The average grip strength of children aged 3 to 6 ranges from 15-25N, yet most products retain adult grip proportions, with handles generally around 9.2cm in diameter. This design often prevents small hands from forming a stable grip, increasing the risk of slipping the grip and inadvertently reducing user comfort. Many parents report that children simply don't want to play with the toys after a while. Therefore, a wire fixing structure for entanglement-resistant talking toys for young children has been proposed to address this issue. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a wire fixing structure for an anti-entanglement sound-transmitting toy for young children, which solves the problem that the wire interface is easy to loosen and easy to entangle and knot during use.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A wire fixing structure for an anti-entanglement sound-transmitting toy for children, comprising:

[0007] A cavity mechanism, used to serve as a receiving body;

[0008] The cavity mechanism includes a resonant cavity, the inner wall of the resonant cavity is provided with a plurality of sound wave reflection convex points, and the sound wave reflection convex points are distributed in an equidistant array, the exterior of the cavity mechanism is provided with convex anti-slip grooves, the bottom of the resonant cavity is provided with an edge plate, the bottom of the resonant cavity is provided with a cross-shaped wire groove, the bottom of the resonant cavity is provided with a battery, the outer wall of the resonant cavity is provided with a USB-C charging port, and the bottom of the resonant cavity is provided with an intelligent interactive component;

[0009] A sound transmission mechanism, used to connect the two cavity mechanisms for vibration sound transmission;

[0010] The storage mechanism is used to connect the cavity mechanism and to wind and store the sound transmission mechanism.

[0011] Preferably, the sound transmission mechanism includes a nylon core wire, the nylon core wire is used to connect the two resonance cavities, and a TPU protective layer is provided on the outside of the nylon core wire.

[0012] Preferably, the storage mechanism includes a circular wire-receiving box, a ring groove is provided in the middle of the circular wire-receiving box, a waist-shaped groove is provided on the top of the circular wire-receiving box, a limit plate is provided on the inner side of the ring groove, two snap plates are provided on the surface of the circular wire-receiving box, and both ends of the circular wire-receiving box are connected with edge plates by threads.

[0013] Preferably, the intelligent interactive component includes a visual feedback module, an audio conduction module, an intelligent acoustic control module, an acoustic sensor module, a vibration feedback module, an audio sensing module and a signal processing module. The visual feedback module is arranged at the top of the resonance cavity, and the audio conduction module, the intelligent acoustic control module, the acoustic sensor module, the vibration feedback module, the audio sensing module and the signal processing module are all arranged at the bottom of the resonance cavity. The battery is electrically connected to the audio conduction module, the intelligent acoustic control module, the acoustic sensor module, the vibration feedback module, the audio sensing module and the signal processing module, respectively.

[0014] A toy system for preventing entanglement and transmitting sound, comprising:

[0015] Audio sensor module, used to collect the vibration signal of the nylon core wire and convert it into acoustic electrical signal;

[0016] A signal processing module for filtering and gain adjustment of acoustic and electrical signals;

[0017] An audio conduction module, used to output the processed acoustic signal through the resonance cavity;

[0018] Intelligent acoustic control module, used to dynamically adjust the frequency response of the output signal according to the ambient noise;

[0019] Acoustic sensor module for real-time detection of ambient noise levels;

[0020] a vibration feedback module for generating tactile feedback based on the intensity of the acoustic signal;

[0021] The visual feedback module is used to synchronously feedback the acoustic signal processing process through the light source state. Preferably, the audio sensor module collects the vibration signal through the following relationship:

[0022]

[0023] Where S(t) is the acoustic electrical signal; A is the vibration amplitude, f is the vibration frequency, and T is the sampling period.

[0024] Preferably, the filtering algorithm of the signal processing module satisfies:

[0025] S out (f) = S in (f)·H(f);

[0026] Among them, S out (f) is the output signal after filtering; S in (f) is the input signal before filtering; H(f) is the filter transfer function; j is the imaginary unit, and its value is Used to describe the phase shift; f is the signal frequency; f c The cutoff frequency ranges from 500Hz to 3000Hz and is used to limit the frequency band to which children are sensitive to hearing.

[0027] Preferably, the intelligent acoustic control module adjusts the frequency response through the following relationship:

[0028]

[0029] Where G(f) is the gain coefficient; A0 is the reference gain; f is the signal frequency; and f0 is the resonant frequency.

[0030] Preferably, the vibration force of the vibration feedback module satisfies:

[0031] F=k·log(S max );

[0032] Where F is the vibration force; k is the elastic constant of the piezoelectric material; S max is the maximum amplitude of the acoustic signal.

[0033] Preferably, the light intensity change rate of the visual feedback module satisfies:

[0034]

[0035] in, is the rate of change of light intensity with time; α is the correlation coefficient between light intensity and sound intensity; is the rate of change of sound intensity with time.

[0036] The present invention provides a wire fixing structure for an anti-entanglement talking toy for children. It has the following beneficial effects:

[0037] 1. This invention utilizes a structural design with multiple physical protection mechanisms, including anti-drop buckles, module-embedded buffer layers, and rounded corner mold processing. In actual testing, it passed the EN71-1 standard for small parts and sharp edges, achieving significant safety improvements. Compared to traditional assembled children's toys, which can come loose and cause cuts during long-term use, this solution effectively addresses the issue of poor safety consistency.

[0038] 2. This invention incorporates a biomimetic elastic layer in the gripping area and a symmetrical cable layout strategy, ensuring more even pressure and a more natural touch in the child's hand, significantly improving overall grip comfort. Existing toys commonly suffer from grip discomfort due to high structural rigidity and rough coatings. This solution significantly improves the continuity of children's extended interactive experience.

[0039] 3. By constructing a complete acoustic collection, signal control, and low-loss transmission path, coupled with specialized flexible materials and a low-pass acoustic control strategy, this invention successfully achieves stable sound transmission up to 3.5 meters in a standard environment. Compared to existing structures that suffer from ambiguous sound source localization and short transmission paths, this system significantly improves far-field voice clarity and effective interactive coverage.

[0040] 4. This invention utilizes a linked multimodal feedback mechanism, mapping acoustic information to vibration and visual outputs in real time. This not only enriches the interactive feedback dimension but also improves the system's response efficiency to abnormal behaviors (such as crying and high-frequency screaming). Compared to traditional single-channel feedback toys, this device offers significant advantages in information salience and interactive fun, and is more suitable for special education or low-perception scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A perspective view of the present invention;

[0042] Figure 2 It is a storage schematic diagram of the present invention;

[0043] Figure 3 It is a schematic diagram of the expansion of the present invention;

[0044] Figure 4 For the present invention Figure 3 An enlarged schematic diagram of the middle storage mechanism;

[0045] Figure 5 It is a cross-sectional schematic diagram of the present invention;

[0046] Figure 6 For the present invention Figure 5 A magnified schematic diagram of point A in the middle;

[0047] Figure 7 For the present invention Figure 1A schematic cross-sectional view of the sound transmission mechanism;

[0048] Figure 8 This is a system architecture diagram of the present invention.

[0049] Among them, 1. Cavity mechanism; 101. Resonance cavity; 102. Embossed anti-slip pattern; 103. Cross-shaped wire groove; 104. Edge plate; 105. Sound wave reflection bump; 106. Battery; 107. USB-C charging port; 2. Sound transmission mechanism; 201. Nylon core wire; 202. TPU protective layer; 3. Storage mechanism; 301. Round wire box; 302. Ring groove; 303. Limiting plate; 304. Waist-shaped groove; 305. Buckle plate; 4. Visual feedback module; 5. Audio conduction module; 6. Intelligent acoustic control module; 7. Acoustic sensor module; 8. Vibration feedback module; 9. Audio sensor module; 10. Signal processing module. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] Please see the attached Figure 1 -Attached Figure 7 The embodiment of the present invention provides a wire fixing structure for an anti-entanglement sound-transmitting toy for children, comprising:

[0052] Cavity mechanism 1, used as a receiving body;

[0053] The cavity mechanism 1 includes a resonance cavity 101. The resonance cavity 101 is made of food-grade ABS (compliant with EN71-3 and GB6675.1-2014 standards), with a wall thickness optimized to 2.2 mm (taking into account both strength and lightweight), and an overall sharp-angle-free design (corner radius>3 mm). The cup body diameter of the resonance cavity 101 is 8.2 cm (consistent with the hand length of 95% of children aged 3-6 years old). The inner wall of the resonance cavity 101 is provided with a plurality of sound wave reflection convex points 105. The plurality of sound wave reflection convex points 105 have a coverage rate of 28%, are hemispherical convex points, have a height of 0.5 mm, and a spacing of 1.2 mm. According to the impedance tube test (GB / T20247-2006), the sound pressure level at a frequency of 1000 Hz is increased by 65%, and The sound wave reflection convex points 105 are distributed in an equidistant array, the outside of the cavity mechanism 1 is provided with convex anti-slip patterns 102, the convex anti-slip patterns 102 have a depth of 0.8 mm and a pitch of 1.5 mm, the bottom of the resonance cavity 101 is provided with an edge plate 104 for connecting to the storage mechanism 3, the bottom of the resonance cavity 101 is provided with a cross-shaped wire groove 103, the cross-shaped wire groove 103 has a groove depth of 3 mm and an angle of 90°, the bottom of the resonance cavity 101 is provided with a battery 106 for powering multiple modules, the outer wall of the resonance cavity 101 is provided with a USB-C charging port 107 for powering the battery 106, and the bottom of the resonance cavity 101 is provided with an intelligent interactive component;

[0054] The intelligent interactive component includes a visual feedback module 4, an audio conduction module 5, an intelligent acoustic control module 6, an acoustic sensor module 7, a vibration feedback module 8, an audio sensor module 9 and a signal processing module 10. The visual feedback module 4 is arranged at the top of the resonance cavity 101, and the audio conduction module 5, the intelligent acoustic control module 6, the acoustic sensor module 7, the vibration feedback module 8, the audio sensor module 9 and the signal processing module 10 are all arranged at the bottom of the resonance cavity 101. The battery 106 is electrically connected to the audio conduction module 5, the intelligent acoustic control module 6, the acoustic sensor module 7, the vibration feedback module 8, the audio sensor module 9 and the signal processing module 10 respectively;

[0055] Specifically, the visual feedback module 4 is preferably arranged in the top area of the resonance cavity 101, so that the user can obtain intuitive light effect prompts and interactive feedback during use. The audio conduction module 5, the intelligent acoustic control module 6, the acoustic sensor module 7, the vibration feedback module 8, the audio sensor module 9 and the signal processing module 10 are concentrated in the bottom space of the resonance cavity 101, and a balance between compact structure and functional coordination is achieved through modular arrangement. The battery 106 is electrically connected to each of the above modules through internal circuits to provide continuous and stable energy support for the entire system, ensuring the normal operation of audio interaction, vibration feedback and visual prompt functions, thereby realizing multi-dimensional information collection and output response capabilities;

[0056] The sound transmission mechanism 2 is used to connect the two cavity mechanisms 1 for vibration sound transmission;

[0057] The sound transmission mechanism 2 includes a nylon core wire 201, which is used to connect the two resonance cavities 101. The outside of the nylon core wire 201 is provided with a TPU protective layer 202, nylon core wire 201 (breaking strength> 80N) + TPU protective layer 202 (Shore hardness 85A);

[0058] The storage mechanism 3 is used to connect to the cavity mechanism 1 and to wind and store the sound transmission mechanism 2;

[0059] The storage mechanism 3 includes a circular wire-taking box 301, a ring groove 302 is provided in the middle of the circular wire-taking box 301 for winding the nylon core wire 201, a waist-shaped groove 304 is provided on the top of the circular wire-taking box 301 for threading, and a limit plate 303 is provided on the inner side of the ring groove 302 to prevent it from collapsing during the winding process. Two snap plates 305 are provided on the surface of the circular wire-taking box 301 for fixing the wire, and the two ends of the circular wire-taking box 301 are connected to the edge plate 104 by threads.

[0060] Working Principle: First, before use, pass the nylon core wire 201 with the TPU protective layer 202 through the cross-shaped wire groove 103 of the resonance cavity 101, tie the two ends of the nylon core wire 201 into knots or melt the two ends to form round ends, then tighten the two resonance cavities 101 to make the nylon core wire 201 taut, place one resonance cavity 101 on the user's ear, and the other close to the user's mouth or pronunciation equipment to pronounce, and the sound wave vibration is transmitted through the nylon core wire 201 to the other end of the resonance cavity 101;

[0061] There are also many usage scenarios:

[0062] Teaching interaction: The teacher uses the pronunciation device to input instructions, and the student receives the voice through the resonance cavity 101. The green flashing LED light on the visual feedback module 4 indicates that the answer is correct;

[0063] Family games: When two people are talking on the phone, the vibration module 8 provides tactile feedback based on the sound intensity, enhancing the fun of role-playing.

[0064] Outdoor Exploration: In noisy environments, the intelligent acoustic control module 6 automatically increases the volume to 120dB to ensure clear voice transmission;

[0065] After use, first pass the nylon core wire 201 through the waist-shaped groove 304 of the circular wire-taking box 301, and then screw it onto the edge plate 104 of one of the resonance cavities 101. Then, tighten the nylon core wire 201 and wind the nylon core wire 201 into the inside of the ring groove 302. The limit plate 303 is used to break open during the winding process. After winding, the remaining section of the nylon core wire 201 is clamped in the buckle plate 305, and the clamped section of the nylon core wire 201 is placed on the buckle plate 305 on the surface of the circular wire-taking box 301. Then, screw on another resonance cavity 101 for storage to prevent the nylon core wire 201 from being entangled together and to better store it.

[0066] The anti-entanglement talking toy system for infants described below and the wire fixing structure of the anti-entanglement talking toy for infants described above can be referred to each other.

[0067] Please see the attached Figure 8 The present invention also provides a toy system for preventing entanglement and transmitting sound, comprising:

[0068] The audio sensor module 9 is used to collect the vibration signal of the nylon core wire 201 and convert it into an acoustic electrical signal;

[0069] In this embodiment, the audio sensor module 9 includes at least one piezoelectric ceramic sensor element, which can be in the form of a sheet or a curved sheet, such as a common PZT piezoelectric element. This sensor element fits tightly against the outside of the nylon core wire 201 and is connected to the signal circuit via conductive adhesive or ultrasonic welding, forming a stable electromechanical coupling structure.

[0070] Generally speaking, when a young child makes voice, breathing sounds or crying sounds through a toy, the sound waves excite the nylon core wire to produce slight mechanical vibrations. This vibration will cause the piezoelectric piece to deform, thereby outputting an amount of charge proportional to the vibration state. After passing through a charge amplifier or voltage follower, a continuous analog electrical signal is output.

[0071] Specifically, in this module, the following relationship exists between the acoustic electrical signal S(t) and the vibration physical quantity:

[0072]

[0073] Where: S(t) is the acoustic electrical signal, measured in volts (V), which represents the voltage output by the piezoelectric patch as a function of time; A is the vibration amplitude, measured in meters (m), representing the instantaneous maximum displacement generated by the nylon core wire; f is the vibration frequency, measured in hertz (Hz), representing the structural resonance frequency excited by the sound wave; T is the sampling period, measured in seconds (s), which is the length of the time window within which the front-end ADC module acquires the analog signal.

[0074] In a possible implementation, the piezoelectric sensors are arranged at intervals of 20 cm to improve signal coverage and avoid acquisition blind spots caused by local poor contact.

[0075] As an alternative, the piezoelectric material can be PZT-5H, which has a higher charge sensitivity (typically 350pC / N) and is suitable for detecting speech or ambient sounds in the low-frequency range (100–3000Hz). In addition, to prevent the sensor from breaking under pressure, some embodiments are coated with a 0.3mm thick silicone buffer layer on its surface, which serves as both flexible protection and structural shock absorption.

[0076] In the specific circuit implementation, this embodiment uses a low-noise operational amplifier, such as OPA1612, to increase signal gain while suppressing background noise. Its bandwidth covers more than 20 kHz, ensuring that voice information does not suffer from frequency band reduction.

[0077] To improve signal quality, a pre-anti-aliasing filter is introduced at the circuit level. The typical RC parameter configuration is: resistance value is 10kΩ, capacitance value is 10nF, and the corresponding analog bandwidth is 1.6kHz, which can effectively remove high-frequency interference signals in the environment that exceed the upper limit of children's voice frequency.

[0078] In some embodiments, to address the problem of multi-source signal interference, the output end of this module also integrates a signal buffer circuit and automatic baseline correction logic to prevent signal drift caused by initial position offset of the sensor.

[0079] In addition, in order to adapt to the changes in sound pressure levels of children of different age groups, the system allows dynamic sensitivity adjustment based on the actual collected signal amplitude A. For example, when A<1×10 -5 m, the gain is automatically adjusted to high sensitivity mode to ensure that weak sound sources can still be clearly restored.

[0080] In terms of system integration, the audio sensor module is connected to the main control board via a flexible cable, and a multi-channel input interface is reserved to support extended functions such as dual-channel acquisition, spatial sound positioning, or subsequent binaural interaction.

[0081] The signal processing module 10 is used to filter and gain-adjust the acoustic and electrical signals;

[0082] In this embodiment, the signal processing module 10 mainly performs frequency domain selective retention processing on the input signal through a bandpass filter, so that its spectrum is concentrated within the typical frequency band of children's language activities, thereby effectively removing non-speech components and high-frequency or low-frequency background interference.

[0083] In general, the filtering algorithm is based on standard digital filtering implementation and is described using a frequency domain transfer function model. Its filtering behavior can be expressed by the following formula:

[0084] S out (f) = S in (f)·H(f);

[0085] Where: S out (f) is the frequency domain representation of the output signal after filtering, in volts (V); S in (f) is the frequency domain representation of the input signal before filtering, in volts (V); H(f) is the filter transfer function, a complex function used to characterize the gain and phase response of the filter to different frequency components; f is the current signal frequency, in Hertz (Hz); f c is the filter cutoff frequency in Hertz (Hz), and in the present invention, its value range is 500Hz to 3000Hz; j is an imaginary unit, defined as Used to describe the changes in signal phase characteristics in the frequency domain.

[0086] As an option, a 4th-order Butterworth bandpass filter can be used as the filter type. Its characteristics are that it has a flat gain response without ripple in the passband and a fast roll-off characteristic in the stopband, generally -24dB / Oct; this characteristic helps to improve the signal-to-noise ratio between the speech signal and the background noise in the present invention.

[0087] Specifically, in this embodiment, the input signal sampling rate is set to 16kHz, and the corresponding Nyquist frequency is 8kHz; the filter passband range is set between 700Hz and 2800Hz to match the common speech frequency range of children. For example, the pronunciation peaks are mostly concentrated around 1000Hz, while the consonant parts are mostly above 2000Hz. This filter design can effectively retain key speech components.

[0088] In one possible implementation, the filter is implemented by a fixed-point DSP core in an STM32F4 series microcontroller, a multi-order filter bank is constructed by cascading second-order IIR filters, and a direct type-II structure is used to avoid the diffusion of numerical precision errors. The coefficients are calculated based on double-precision floating-point offline calculation results and loaded and run through a table lookup.

[0089] In order to further improve real-time performance and system compatibility, in some embodiments, the filtering module is directly connected to the ADC and DAC interfaces via DMA to achieve high-throughput non-blocking signal transmission, reduce interrupt frequency, and improve power consumption efficiency.

[0090] In addition, this embodiment also integrates a signal amplitude evaluation module, which determines the voice intensity by calculating the signal RMS (Root Mean Square) and adjusts the gain of the amplifier circuit in real time. The specific expression is:

[0091]

[0092] Where: V RMS Indicates the root mean square amplitude of the signal in volts (V); x i Represents the instantaneous voltage value of the i-th sampling point, in volts (V); N is the total number of sampling points, which is usually set to 512 or 1024 in this design; if V RMS <0.3V, the control module activates the automatic gain control (AGC) logic to increase the amplifier output level to the set threshold; otherwise, if V RMS >2.0V, the system enters the limit protection state to avoid damage or distortion to the subsequent stage due to overdrive of large signals.

[0093] In some embodiments, the filtering module also provides a frequency domain envelope tracking function to detect the modulation structure of the speech signal, thereby providing a preliminary analysis basis for subsequent rhythm recognition or interactive command extraction.

[0094] The audio conduction module 5 is used to output the processed acoustic signal through the resonance cavity 101;

[0095] In this embodiment, the audio transmission module 5 consists of a piezoelectric drive unit and an elastic coupling layer, which are integrally embedded within the inner wall of the toy housing or between flexible fabric layers. The piezoelectric drive unit can be a bidirectional ceramic piezoelectric disc, with its two ends connected to the signal amplifier output terminal and ground, respectively, to achieve a stable push-pull drive mode. This piezoelectric structure undergoes periodic deformation in response to the drive signal, generating perceptible vibration waves in the contact medium.

[0096] Generally speaking, the vibration amplitude A generated by the piezoelectric drive is o With input voltage V in It is a linear relationship, and its expression can be expressed as:

[0097] A o =d 33 ·V in ;

[0098] Among them: A o is the output vibration displacement of the driving end, in meters (m); d 33 is the electrostrictive coefficient of the piezoelectric material, in meters per volt (m / V). In this embodiment, PZT-4 material is selected, and its typical value is 300×10 -12 m / V; V inThis is the piezoelectric drive input voltage, measured in volts (V). Its peak value is generally controlled below 5V to ensure long service life and child safety.

[0099] In one possible implementation, the audio conduction path is set as a multi-point coupling structure, that is, a number of piezoelectric driving elements are evenly embedded inside a section of flexible sound-conducting cable, and a uniform sound wave conduction path is formed in conjunction with a silicone coating layer; this design can effectively expand the audio radiation area and reduce the local concentration of sound.

[0100] Specifically, the acoustic impedance of the flexible sound conductor is well matched with children's skin and clothing, effectively reducing the loss of sound wave reflection; the conduction path length is set within 30 cm, and considering the difference in sound conduction speed v in different materials, the sound wave delay time t d It can be approximately expressed by the following formula:

[0101]

[0102] Where: t d is the conduction delay time, in seconds (s); L is the length of the sound conduction path, in meters (m); v is the speed of sound in the medium, in meters / second (m / s), which is approximately 1000 m / s in silicone and approximately 2400 m / s in POM material.

[0103] As an option, the outer surface of the structural parts of the audio conduction module is covered with a layer of skin-friendly thermoplastic elastomer with a thickness of 0.5mm. This material has good softness and tear resistance, which ensures the comfort of children's grip while enhancing the fit of audio conduction.

[0104] In some embodiments, the audio conduction module is further provided with a resonant cavity structure for enhancing the audio energy in the mid-frequency band (such as 1500Hz to 2500Hz); the resonant cavity is surrounded by a PU foam body, and a sound guide channel and a sound amplification outlet are embedded inside. The structure refers to the Helmholtz resonance principle, and its equivalent resonant frequency f r It can be estimated by the following formula:

[0105]

[0106] Where: f r is the resonant frequency, in Hertz (Hz); v is the speed of sound in air, which is about 343m / s; A is the cavity opening area, in square meters (m 2 ); V is the cavity volume, in cubic meters (m 3 );L cff is the equivalent length of the sound duct in meters (m), including the opening correction.

[0107] In this embodiment, in order to control the output sound pressure level within the comfortable hearing range of children (generally between 55dB and 75dB), a limiting drive mechanism is set in the system to avoid excessive stimulation caused by instantaneous high-amplitude signals; this mechanism is based on real-time sampling feedback and dynamically adjusts the drive voltage to effectively suppress output abnormalities.

[0108] In addition, in order to meet the disturbance of the audio conduction path caused by the structural changes of flexible toys, an adaptive compensation mechanism is introduced in some embodiments. The local bending degree of the sound conduction path is detected by embedded sensors, and the driving strategy is adjusted based on strain feedback to maintain the uniformity of sound output.

[0109] Intelligent acoustic control module 6, used to dynamically adjust the frequency response of the output signal according to the ambient noise;

[0110] In this embodiment, the intelligent acoustic control module 6 mainly implements a frequency-based gain adjustment function, which is modeled by a low-pass response control model, and its frequency response relationship is as follows:

[0111]

[0112] Where: G(f) is the gain coefficient at signal frequency f, unit is dimensionless; A0 is the baseline gain, unit is dimensionless, indicating the maximum gain value in the low-frequency region; f is the current signal frequency, unit is Hertz (Hz); f0 is the resonant frequency, unit is Hertz (Hz), which is used to set the cutoff point of frequency regulation.

[0113] Generally speaking, the above formula constitutes a type of amplitude-frequency gain function of a first-order low-pass filter, which is used to suppress high-frequency signal energy above the resonance frequency to avoid discomfort or auditory fatigue in young children caused by sharp audio or noisy environment frequency bands.

[0114] Alternatively, the resonant frequency f0 can be set between 800Hz and 2500Hz, depending on the actual application scenario, to cover the speech recognition frequency band (e.g., 1000Hz to 2000Hz) to which children are most sensitive. When the signal frequency is below f0, the gain G(f) ≈ A0, ensuring good sound fidelity. When the signal frequency is above f0, the gain coefficient decays rapidly, ensuring controlled audio output energy.

[0115] Specifically, in this embodiment, the intelligent acoustic control module is embedded in the co-processing core of the main control chip, and uses a real-time calculation unit based on fixed-point or floating-point numbers to calculate the frequency components of the audio signal frame by frame, and dynamically allocates the output gain according to the above formula.

[0116] In one possible implementation, the module first obtains the spectrum distribution data of the current audio frame through a fast Fourier transform (FFT), then calculates the corresponding G(f) in units of frequency points to form a gain adjustment coefficient matrix, and finally adjusts the original signal amplitude through a multiplication operation to form an adjusted signal sequence.

[0117] In some embodiments, to improve regulation flexibility and responsiveness, the module incorporates a dynamic weight control mechanism, setting different buffer constants for high-frequency transient signals to avoid abrupt audio output changes caused by sudden changes. This mechanism dynamically adjusts the A0 value based on the signal spectrum change rate Δf / Δt, forming a closed-loop gain control strategy.

[0118] In other embodiments, the intelligent acoustic control module further integrates the auditory equal loudness curve model and reconstructs parameters based on the subjective loudness perception of the human ear at different frequencies, making the audio output by the system more natural and balanced for children. For example, for frequencies above 2000Hz, the system automatically introduces a weight reduction coefficient β(f) < 1, and the final gain expression can be expanded to:

[0119]

[0120] Where β(f) is the frequency-dependent attenuation factor, dimensionless, and is generally set between 0.5 and 0.9.

[0121] In addition, the module described in this embodiment supports personalized parameter settings, and f0 and A0 can be remotely configured through a host computer or application to adapt to the hearing sensitivity range and usage scenarios of children of different age groups. For example, a lower resonance frequency setting (such as f0 = 1200Hz) can be used in the infant stage, while in the preschool stage, it can be set at f0 = 1800Hz to take into account speech clarity.

[0122] Acoustic sensor module 7, used for real-time detection of ambient noise level;

[0123] In this embodiment, the acoustic sensor module 7 primarily consists of a MEMS micro-microphone, an analog-to-digital conversion circuit, a front-end buffer circuit, and a bandpass filter unit. This module is fixedly mounted outside the toy body or near the center of the sound propagation path, separated from the audio conduction module 5, to prevent false detection due to structural resonance or feedback interference.

[0124] Generally speaking, the sampling sensitivity of the MEMS microphone is -42dBFS@1kHz, and its frequency response range covers 20Hz to 20kHz, which can meet the perception requirements of various sound sources such as children's voices, crying, external music and environmental noise.

[0125] Specifically, the original voltage signal V output by the acoustic sensor module sAfter pre-amplification and filtering, (t) is sent to the analog-to-digital converter for sampling. Its power spectrum density can be estimated by the following formula:

[0126]

[0127] Where: P(f) is the power spectral density at frequency f, in watts per hertz (W / Hz); V s (t) is the instantaneous voltage signal output by the microphone, in volts (V); T is the signal analysis time window, in seconds (s); f is the current analysis frequency, in Hertz (Hz); j is the imaginary unit,

[0128] As an option, the module introduces a dual-passband filtering strategy within the frequency response range, limiting the analysis frequency band to the infant auditory sensitive frequency band (such as 500Hz to 3000Hz) and the typical noise bandwidth (such as 50Hz to 400Hz), and respectively identifying and distinguishing speech features and low-frequency interference.

[0129] In one possible implementation, the system links this module with the intelligent acoustic control module 6 to measure the background noise sound pressure level SPL (Sound Pressure Level) of the external environment in real time, and corrects the gain strategy according to the following relationship:

[0130]

[0131] Where: SPL is the sound pressure level in decibels (dB); p is the measured sound pressure in Pascals (Pa); p0 is the reference sound pressure, usually 20×10 -6 Pa.

[0132] If the measured SPL is higher than the set threshold (such as 75dB), the module can send a signal to trigger the intelligent acoustic control module 6 to temporarily lower the high-frequency gain A0, forming a self-protection suppression mechanism to avoid hearing overload due to sudden high pitch.

[0133] In some embodiments, the acoustic sensor module further integrates an envelope extraction and rhythm analysis unit, which can be used to analyze the energy envelope E(t) of the continuous speech waveform, which is defined as follows:

[0134]

[0135] By calculating the envelope peak and periodic characteristics, the system can identify specific behavioral events such as children shouting and screaming, and then trigger specific interaction strategies or alarm mechanisms. In addition, to ensure the accuracy and anti-interference of the detection results, this module introduces a temperature drift compensation mechanism. The built-in thermistor monitors the ambient temperature and adjusts the temperature according to the temperature drift coefficient α. TAutomatically adjust the gain compensation factor δ:

[0136] δ=1+α T (T-T0);

[0137] Where: δ is the gain correction factor; α T is the microphone temperature drift coefficient, in degrees Celsius (1 / °C); T is the current temperature, and T0 is the calibration reference temperature.

[0138] In actual deployment, the output of the acoustic sensor module can also serve as an auxiliary basis for judging the behavioral status of young children, such as quiet, active, anxious, etc. By fusing data with other sensing subsystems (such as accelerometers and contact sensors), multimodal behavior judgment can be achieved.

[0139] a vibration feedback module 8, configured to generate tactile feedback based on the acoustic signal intensity;

[0140] In this embodiment, the vibration feedback module 8 uses a piezoelectric actuator as the main actuator. This component generates mechanical micro-deformation in response to the control voltage, thereby stimulating the fixed medium surface to produce low-intensity vibration. Children can perceive this feedback information by holding or touching it.

[0141] Generally speaking, the output vibration force F of the vibration feedback module is equal to the maximum amplitude S of the input signal. max The following relationship is satisfied:

[0142] F=k·log(S max );

[0143] Where: F is the vibration force, in Newtons (N); k is the elastic constant of the piezoelectric material, in N / In (m), which reflects the deformation response ability of the material under logarithmic amplitude changes; S max The maximum amplitude of the acoustic signal, in meters (m), is dynamically calculated by the signal processing module.

[0144] This relationship reflects the nonlinear perception law of tactile feedback to input intensity in human-computer interaction, that is, human perception of stimulus intensity is often proportional to its logarithm. max Based on real-time measurement, the module can automatically control the vibration intensity to achieve a vibration response that is neither excessive nor slow.

[0145] As an option, the piezoelectric actuator is made of PZT series ceramic material, whose elastic constant k is generally in the range of 10 6 ~10 8 N / m 2 , according to the equivalent conversion of the structural layout area and deformation, the value in typical applications is about 2.1×10 7 N / ln(m).

[0146] Specifically, the core control unit of the vibration feedback module samples the short-term energy and amplitude of the audio signal frame. max And calculate the target vibration force F, and then map the result to the driving voltage V d The driving voltage and the output vibration force satisfy the following approximate relationship:

[0147]

[0148] Where: V d is the piezoelectric drive voltage, in volts (V); α is the force-to-electricity conversion coefficient of the piezoelectric actuator, in N / V, which is adjusted between 0.1-1.0 N / V according to the specific device selection.

[0149] In one possible implementation, the vibration feedback module uses multi-band analysis to set different vibration patterns for different sound source signals. For example, when the peak frequency of the detected voice signal is concentrated below 1000Hz, a low-frequency vibration pattern is used; when a high-frequency, sharp sound (such as crying or collision) is recognized, a short-period, high-amplitude pulse vibration is used to increase the feedback intensity.

[0150] In some embodiments, this module is also combined with the intelligent acoustic control module 6 to form an "auditory-tactile synchronous feedback unit" that can generate a matching vibration beat based on the rhythm characteristics. Its core vibration rhythm control function is as follows:

[0151] V d (t) = A·sin(2πf v t);

[0152] Where: V d (t) is the driving voltage at a certain moment; A is the vibration driving amplitude, in volts (V); f v is the vibration frequency in Hertz (Hz), which can be set between 10 Hz and 200 Hz to match the peak tactile response of the human body; t is the time variable in seconds (s).

[0153] In addition, to enhance safety and lifespan, the module introduces a voltage limiting mechanism. When the driving voltage exceeds the set safety upper limit (such as 5V), the input gain is automatically reduced and the protection state is triggered to prevent overload from damaging the piezoelectric device or causing excessive vibration.

[0154] At the hardware level, the vibration feedback module in this embodiment is connected to the main control circuit via an FPC cable and equipped with an independent power supply voltage regulator module. Operating power consumption is less than 50mW, making it suitable for long-term operation. The overall structural design allows for flexible placement and integration into soft parts or gripping areas of toys without affecting the original appearance and safety.

[0155] Visual feedback module 4, used to synchronously feedback the acoustic signal processing process through the light source status;

[0156] In this embodiment, the visual feedback module 4 primarily comprises an LED driver unit, a brightness control circuit, a signal analyzer, and a multi-color light-emitting element array. This module dynamically controls the intensity, frequency, or color of the light output based on changes in the sound intensity of the audio signal, implementing an audio-visual feedback mechanism with rapid response, low energy consumption, and diverse forms.

[0157] Generally, the visual feedback module adjusts the luminous intensity in real time according to the rate of change of the sound intensity. The following mathematical relationship exists between the rate of change of the sound intensity and the rate of change of the acoustic signal:

[0158]

[0159] in: is the rate of change of light intensity with time, in lumens per second (lm / s); α is the correlation coefficient between light intensity and sound intensity, in Im·s / V; is the rate of change of sound intensity over time, in volts per second (V / s); I is the current light intensity (in lumens); S is the current sound intensity (in volts), and its value is dynamically calculated by the signal processing module.

[0160] Specifically, the visual feedback module receives the envelope information or sound intensity peak output from the signal processing module and performs real-time derivative to obtain Then calculate the required light intensity change rate based on the set parameter coefficient α The target light intensity I(t) is obtained by integration and is ultimately used to control the PWM duty cycle of the LED, thereby dynamically adjusting the brightness.

[0161] As an option, the module supports multi-channel lighting configuration, such as driving red, green and blue LEDs simultaneously, and can map different frequency bands to different color channels based on frequency characteristics, which is used to assist young children in identifying speech characteristics such as pitch, rhythm and so on.

[0162] In one possible implementation, the system converts the main frequency f of the audio signal s Mapped to hue parameter C h , brightness amplitude and signal energy E s The implementation formula is as follows:

[0163] C h =f s mod 360,L=β·E s ;

[0164] Where: C h is the hue value, in degrees (°), used to define the RGB color wheel position; fs is the main frequency, in Hertz (Hz); L is the brightness value; β is the energy-brightness mapping coefficient, in Im / V 2 ;E s The short-time energy of the audio signal, expressed in volts squared (V 2 ).

[0165] In some embodiments, the visual feedback module and the vibration feedback module are linked, triggering simultaneous flashing and high-frequency vibration when sound intensity suddenly increases, enhancing the visibility of sensory cues. The system can also determine the current interaction state based on the long-term average sound intensity and set a visual brightness limit to prevent excessive light stimulation from adversely affecting children's vision.

[0166] In addition, in order to adapt to the changes in ambient light, an ambient brightness detection circuit is also set in the visual feedback module to measure the external illumination L through a photoresistor. env , automatically adjust the LED maximum brightness threshold I max :

[0167]

[0168] Among them, I0 is the preset brightness reference; L ref The reference maximum ambient brightness is in lux (Ix); L cnv The current ambient brightness.

[0169] In terms of control method, the module can adopt a time-sharing control strategy, that is, when no significant sound intensity change is detected in the signal processing module, the light source is automatically extinguished and the system enters a low-power standby state, effectively extending the system operation time.

[0170] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A wire fixing structure for a toy for preventing entanglement of children, characterized in that: include: A cavity mechanism (1) is used as a receiving body; The cavity mechanism (1) comprises a resonant cavity (101), the inner wall of the resonant cavity (101) is provided with a plurality of sound wave reflection convex points (105), and the sound wave reflection convex points (105) are distributed in an equidistant array, the outside of the cavity mechanism (1) is provided with convex anti-slip grooves (102), the bottom of the resonant cavity (101) is provided with an edge plate (104), the bottom of the resonant cavity (101) is provided with a cross-shaped line groove (103), the bottom of the resonant cavity (101) is provided with a battery (106), the outer wall of the resonant cavity (101) is provided with a USB-C charging interface (107), and the bottom of the resonant cavity (101) is provided with an intelligent interactive component; A sound transmission mechanism (2) is used to connect the two cavity mechanisms (1) to perform vibration sound transmission; The storage mechanism (3) is used to connect to the cavity mechanism (1) and to wind and store the sound transmission mechanism (2).

2. The wire fixing structure of the anti-entanglement sound-transmitting toy for children according to claim 1, characterized in that: The sound transmission mechanism (2) comprises a nylon core wire (201), the nylon core wire (201) is used to connect two resonance cavities (101), and a TPU protective layer (202) is provided on the outside of the nylon core wire (201).

3. The wire fixing structure of the anti-entanglement sound-transmitting toy for children according to claim 1, characterized in that: The storage mechanism (3) comprises a circular wire-receiving box (301), a ring groove (302) is provided in the middle of the circular wire-receiving box (301), a waist-shaped groove (304) is provided on the top of the circular wire-receiving box (301), a limiting plate (303) is provided on the inner side of the ring groove (302), two snap plates (305) are provided on the surface of the circular wire-receiving box (301), and both ends of the circular wire-receiving box (301) are connected to the edge plate (104) by means of a thread.

4. The wire fixing structure of the anti-entanglement sound-transmitting toy for children according to claim 1, characterized in that: The intelligent interactive component comprises a visual feedback module (4), an audio conduction module (5), an intelligent acoustic control module (6), an acoustic sensor module (7), a vibration feedback module (8), an audio sensor module (9) and a signal processing module (10); the visual feedback module (4) is arranged at the top of the resonance cavity (101); the audio conduction module (5), the intelligent acoustic control module (6), the acoustic sensor module (7), the vibration feedback module (8), the audio sensor module (9) and the signal processing module (10) are all arranged at the bottom of the resonance cavity (101); and the battery (106) is electrically connected to the audio conduction module (5), the intelligent acoustic control module (6), the acoustic sensor module (7), the vibration feedback module (8), the audio sensor module (9) and the signal processing module (10), respectively.

5. A system for preventing entanglement of a toy for children, applied to the wire fixing structure of the toy for preventing entanglement of a toy for children according to any one of claims 1 to 4, characterized in that: include: An audio sensor module (9) is used to collect the vibration signal of the nylon core wire (201) and convert it into an acoustic electrical signal; A signal processing module (10) for filtering and gain-adjusting acoustic and electrical signals; An audio conduction module (5) is used to output the processed acoustic signal through the resonance cavity (101); An intelligent acoustic control module (6) for dynamically adjusting the frequency response of the output signal according to the ambient noise; an acoustic sensor module (7) for detecting the ambient noise level in real time; a vibration feedback module (8), configured to generate tactile feedback based on the acoustic signal intensity; The visual feedback module (4) is used to synchronously feedback the acoustic signal processing process through the light source state.

6. The anti-entanglement sound-transmitting toy system for children according to claim 5, characterized in that: The audio sensor module (9) collects the vibration signal through the following relationship: Where S(t) is the acoustic electrical signal; A is the vibration amplitude, f is the vibration frequency, and T is the sampling period.

7. The anti-entanglement sound-transmitting toy system for children according to claim 5, characterized in that: The filtering algorithm of the signal processing module (10) satisfies: S out (f)=S in (f)·H(f); Among them, S out (f) is the output signal after filtering; S in (f) is the input signal before filtering; H(f) is the filter transfer function; j is the imaginary unit, and its value is Used to describe the phase shift; f is the signal frequency; f c The cutoff frequency ranges from 500Hz to 3000Hz and is used to limit the frequency band to which children are sensitive to hearing.

8. The anti-entanglement sound-transmitting toy system for children according to claim 5, characterized in that: The intelligent acoustic control module (6) adjusts the frequency response through the following relationship: Where G(f) is the gain coefficient; A0 is the reference gain; f is the signal frequency; and f0 is the resonant frequency.

9. The anti-entanglement sound-transmitting toy system for children according to claim 5, characterized in that: The vibration force of the vibration feedback module (8) satisfies: F=k·log(S max ); Where F is the vibration force; k is the elastic constant of the piezoelectric material; S max is the maximum amplitude of the acoustic signal.

10. The anti-entanglement sound-transmitting toy system for children according to claim 5, characterized in that: The light intensity change rate of the visual feedback module (4) satisfies: in, is the rate of change of light intensity with time; α is the correlation coefficient between light intensity and sound intensity; is the rate of change of sound intensity with time.

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