A record player abyss light effect structure processing system

Abstract

The present application belongs to the technical field of optical control of record players, and discloses a record player abyss lamp light effect structure processing system. The system comprises a radial magnetization magnetic ring fixed to the main shaft of a turntable, a Hall rotation speed sensor, a microprocessor, a full-bridge driving circuit, an electromagnetic induction coil, a transparent magnetic fluid and a light-emitting diode light source. The microprocessor converts the rotation speed deviation value into two-way pulse width modulation signals with opposite polarities, and the full-bridge driving circuit controls the electromagnetic induction coil to generate an alternating magnetic field. The alternating magnetic field drives the transparent magnetic fluid to change the density gradient distribution along the light path, and the light beam emitted by the light-emitting diode light source produces Rayleigh scattering when penetrating the fluid, forming a light halo layered structure. The scheme converts the mechanical rotation speed fluctuation of the turntable into the physical density change of the fluid to change the scattering form of the light path, realizes the acousto-optic-electric physical feedback closed loop, and solves the decoupling problem of the longitudinal depth change of the light space and the mechanical operation state.

Description

Technical Field

[0001] This invention belongs to the field of optical control technology for record players, and discloses a structure processing system for deep-sea lighting effects in record players. Background Technology

[0002] Currently, record players with integrated lighting typically place LED light sources below the platter, and construct a cavity with multiple reflective surfaces below the light source. To make the lighting respond to the record player's operating status, the conventional approach involves fixing a radially magnetized magnetic ring on the platter spindle, in conjunction with a Hall effect speed sensor to detect the platter's rotation speed. The speed signal output by the Hall effect speed sensor is input to a microcontroller, which has a pre-stored fixed speed threshold. When the detected speed fluctuation exceeds this threshold, the microcontroller outputs a switching level signal to control the on / off state of a power switch transistor, thereby controlling the on / off state or color switching of the LED light source. In this implementation, the light emitted by the LED light source passes directly through a static reflector or light guide into the multi-layered reflective cavity, and the propagation path and divergence angle of the beam within the cavity are determined by the fixed physical structure.

[0003] The core flaw of the conventional technical solutions described above lies in the fact that the light response is merely a change in the brightness level of the light source itself, and the spatial distribution of the light beam within the reflective cavity remains static. The microscopic mechanical rotational speed fluctuations generated when the stylus tracks in the record groove fail to alter the physical form of the light path, resulting in a decoupling between the spatial depth changes of the light and the mechanical operation of the turntable. Existing technologies lack a mechanism to convert mechanical speed fluctuations into changes in the depth of the light path in physical space, leading to a break in the acoustic-optical-electrical physical feedback. Summary of the Invention

[0004] The purpose of this invention is to provide a structure processing system for the abyss lighting effect of a record player, which can effectively solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A phonograph abyss lighting effect structure processing system includes a radially magnetized magnetic ring fixed to the main shaft of the phonograph turntable, a Hall speed sensor disposed outside the radially magnetized magnetic ring, a microprocessor, an H-bridge drive circuit, an electromagnetic induction coil disposed around the abyss lighting cavity, a transparent magnetic fluid contained in the abyss lighting cavity, and a light-emitting diode light source disposed on the light-incident side of the abyss lighting cavity. The output terminal of the Hall speed sensor is connected to the signal acquisition pin of the microprocessor. The microprocessor is equipped with a reference speed register. The microprocessor subtracts the real-time pulse period acquired by the Hall speed sensor from the value of the reference speed register to obtain the speed deviation value, and converts the speed deviation value into two pulse width modulation signals with opposite polarities. The two pulse width modulation signals with opposite polarities are respectively input to the two control terminals of the H-bridge drive circuit, and the output terminal of the H-bridge drive circuit is connected to the electromagnetic induction coil. The alternating magnetic field generated by the electromagnetic induction coil drives the transparent magnetic fluid to change its density gradient distribution along the optical path. When the light beam emitted by the light-emitting diode light source penetrates the transparent magnetic fluid, Rayleigh scattering occurs, forming a halo layered structure on the surface of the turntable.

[0006] Preferably, the microprocessor is also equipped with a digital low-pass filter and a pulse edge capture timer; The Hall speed sensor outputs a speed square wave signal to the microprocessor. The speed square wave signal is input to the digital low-pass filter to filter out mechanical vibration noise higher than a preset frequency. The filtered speed square wave signal is then input to the pulse edge capture timer. The pulse edge capture timer records the time interval between two adjacent rising edges as the real-time pulse period; When the absolute value of the difference between the real-time pulse period and the reference period in the reference speed register exceeds the preset steady-state tolerance range, the microprocessor triggers the deviation calculation interrupt service routine and outputs the absolute value of the difference as the speed deviation value to the pulse width modulation generator to prevent the transparent magnetic fluid from generating false trigger scattering due to non-tracking mechanical vibration caused by scratches on the record surface during the turntable startup phase.

[0007] Preferably, the microprocessor integrates a dual-channel advanced timer, which includes a first comparison register and a second comparison register; The microprocessor maps the absolute value of the speed deviation value to a duty cycle adjustment amount, and maps the positive or negative sign of the speed deviation value to a phase control flag; When the phase control flag is positive, the first comparator register outputs a high level and the second comparator register outputs a low level. When the phase control flag is negative, the first comparator register outputs a low level and the second comparator register outputs a high level. The dual-channel advanced timer inserts a dead time delay of fixed duration during the state switching process between the first comparator register and the second comparator register. The dead time delay is used to eliminate the risk of shoot-through short circuit between the upper and lower power switches of the same bridge arm in the H-bridge drive circuit.

[0008] Preferably, the electromagnetic induction coil includes a primary winding spirally wound along the outer wall of the abyss light cavity and a secondary winding spirally wound in the opposite direction around the outside of the primary winding. The two ends of the primary winding are connected to the first output terminal and the second output terminal of the H-bridge drive circuit, and the two ends of the secondary winding are left floating and connected to a damping absorption resistor. When the primary winding is energized, it excites a basic axial driving magnetic field inside the abyss light cavity. When the basic axial driving magnetic field changes, the secondary winding generates a reverse induced current. The reverse induced current flows through the damping absorption resistor to form a reverse compensation magnetic field that cancels the edge divergence component of the basic axial driving magnetic field, thereby constraining the transparent magnetic fluid to undergo density gradient distribution changes within a defined area of ​​the central axis of the abyss light cavity.

[0009] Preferably, the transparent magnetic fluid includes a base fluid and a mixture of nano-iron oxide particles and nano-boron nitride sheets uniformly suspended inside the base fluid; The average particle size of the nano-iron oxide particles is 10 to 15 nanometers, and the radial dimension of the nano-boron nitride sheet mixture is 50 to 80 nanometers. The carrier fluid is a mixture of dimethyl silicone oil and fluorinated vegetable oil in a volume ratio, and the dynamic viscosity of the carrier fluid at 25 degrees Celsius is in the range of 50 mPascals to 100 mPascals. The nano-boron nitride sheet mixture aligns along the magnetic field lines under the action of the alternating magnetic field, reducing the internal fluid shear resistance of the transparent magnetic fluid during the process of density gradient distribution change.

[0010] Preferably, the light-emitting diode light source is a narrowband blue light-emitting diode array with an emission peak wavelength in the range of 450 nanometers to 470 nanometers; The central beam of the light emitted by the narrow-band blue light-emitting diode array passes perpendicularly through the central region of the transparent magnetic fluid. The nanoparticles inside the transparent magnetic fluid are in a state of disordered Brownian motion when there is no external magnetic field. When the light beam emitted by the narrow-band blue light-emitting diode array penetrates the disordered transparent magnetic fluid, it undergoes weak forward scattering. When the transparent magnetic fluid forms the density gradient distribution change under the action of the alternating magnetic field, the nanoparticles form a periodically changing refractive index structure along the light beam penetration direction, and the light beam emitted by the narrow-band blue light-emitting diode array excites a lateral Rayleigh scattering beam in the periodically changing refractive index structure.

[0011] Preferably, the digital low-pass filter is an adaptive sliding window filter based on a first-order hysteresis algorithm, and the window length of the adaptive sliding window filter has a dynamic negative correlation with the preset steady-state tolerance interval. When the record player reads a classical music record with a large dynamic range, the preset steady-state tolerance range is configured as the first threshold, and the window length of the adaptive sliding window filter is shortened to 3 sampling points to retain the high-frequency tracking fluctuation component in the speed square wave signal. When the record player reads a low dynamic range audio record, the preset steady-state tolerance range is configured as a second threshold, and the window length of the adaptive sliding window filter is extended to 8 sampling points to deeply filter out the low-frequency mechanical background noise in the speed square wave signal.

[0012] Preferably, the inner wall of the electromagnetic induction coil is fitted with a high permeability permalloy shielding layer, and the inner surface of the high permeability permalloy shielding layer is coated with an electrically insulating magnesium oxide coating. The primary winding and the secondary winding are wound on a coil frame made of polyetheretherketone material. The inner wall of the coil frame is provided with a spiral cooling channel, and cooling circulating water is introduced into the spiral cooling channel. The high permeability permalloy shielding layer, together with the electrically insulating magnesium oxide coating, confines the leakage flux generated by the primary winding and the secondary winding within the closed physical gap between the coil frame and the high permeability permalloy shielding layer, thus blocking the leakage flux from radiating into the space where the phonograph pickup head is located, in order to avoid introducing electromagnetic interference audio background noise.

[0013] Preferably, a flexible polyimide film heating element is embedded in the bottom of the abyss light cavity, and a positive temperature coefficient thermistor is attached to the surface of the flexible polyimide film heating element. The two ends of the positive temperature coefficient thermistor are connected to the non-inverting input of the comparator amplifier circuit, the inverting input of the comparator amplifier circuit is connected to the reference voltage, the output of the comparator amplifier circuit is connected to the base of the power switch transistor, and the collector of the power switch transistor is connected to the power supply circuit of the flexible polyimide film heating element. When the temperature of the transparent magnetic fluid inside the abyss light cavity is lower than the temperature threshold corresponding to the reference voltage, the flexible polyimide film heating element is energized to generate heat, compensating for the viscosity increase of the transparent magnetic fluid in the low-temperature environment in order to maintain the magnetic field response rate of the nano-iron oxide particles.

[0014] Preferably, the light-emitting diode light source consists of a red light-emitting diode, a green light-emitting diode, and a narrow-band blue light-emitting diode array arranged sequentially along the depth direction of the abyss light cavity; The nanoparticles inside the transparent magnetic fluid exhibit a gradient distribution with increasing particle size along the depth direction. The nanoparticles closer to the red light-emitting diode have the smallest particle size, while the nanoparticles closer to the narrow-band blue light-emitting diode array have the largest particle size. The long-wavelength light beam emitted by the red light-emitting diode undergoes weak scattering in the region of the smallest nanoparticles and reaches the surface of the turntable to form a bottom red halo. The short-wavelength light beam emitted by the narrow-band blue light-emitting diode array undergoes strong lateral Rayleigh scattering in the region of the largest nanoparticles to form a top blue light scattering layer, thus creating an abyss light effect with physical depth color transition.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention acquires the rotational speed deviation of the turntable using a Hall effect speed sensor. A microprocessor converts this deviation into two pulse-width modulation (PWM) signals of opposite polarities and inputs them into a full-bridge drive circuit. The full-bridge drive circuit controls an electromagnetic induction coil to generate an alternating magnetic field. This alternating magnetic field drives a change in the density gradient distribution of the transparent magnetic fluid within the abyss light's cavity along the optical path. When the light beam emitted by the LED light source penetrates the density-changing transparent magnetic fluid, Rayleigh scattering occurs, forming a halo layered structure on the turntable surface that dynamically changes with the rotational speed deviation. This scheme directly converts the mechanical rotational speed deviation of the turntable into a change in the physical density of the transparent magnetic fluid. By altering the scattering path of the light beam, it breaks the limitation of a fixed optical path, achieving a closed-loop physical feedback of acoustic, electrical, and electronic components.

[0016] 2. By setting a digital low-pass filter within the microprocessor to filter out non-tracking mechanical vibration noise, and combining this with a dual-channel advanced timer to insert a dead-time delay during state switching to prevent short circuits in the full-bridge drive circuit, the accuracy of speed deviation extraction and hardware operational safety are ensured. A reverse-compensating magnetic field is generated by setting a secondary winding with reverse spiral windings to constrain the changing region of the transparent magnetic fluid. This, combined with a mixture of nano-iron oxide particles and nano-boron nitride sheets, reduces the internal shear resistance of the fluid. Furthermore, a narrow-band blue LED array is used to excite lateral Rayleigh scattering in a periodically varying refractive index structure, improving the lateral control accuracy of beam scattering and the fluid response rate. Additionally, by dynamically adjusting the filter window length using an adaptive sliding window filter, setting a permalloy shielding layer to block leakage flux radiation to the pickup head, configuring a polyimide film heating element to compensate for the increase in fluid viscosity at low temperatures, and utilizing the increasing particle size distribution of nanoparticles along the depth direction to construct color transitions, the interference of ambient temperature, electromagnetic interference, and differences in record type on system stability is eliminated, maintaining the physical depth visual effect of the halo layered structure. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating the overall signal processing and control process of the system according to the present invention. Figure 2 This is a flowchart of the microprocessor internal speed deviation calculation and anti-interference filtering process of the present invention; Figure 3This is a flowchart of the dual-channel pulse width modulation signal generation and dead-zone protection process of the present invention; Figure 4 This is a flowchart of the dual-channel pulse width modulation signal generation and dead-zone protection process of the present invention; Figure 5 This is a flowchart illustrating the density change and light scattering response of the transparent magnetic fluid according to the present invention. Figure 6 This is a flowchart of the fluid temperature adaptive compensation control of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Please refer to Figure 1 This embodiment provides a phonograph abyss lighting effect structure processing system, including a radially magnetized magnetic ring fixed to the phonograph turntable spindle, a Hall speed sensor disposed outside the radially magnetized magnetic ring, a microprocessor, an H-bridge drive circuit, an electromagnetic induction coil disposed around the abyss lighting cavity, a transparent magnetic fluid contained in the abyss lighting cavity, and a light-emitting diode light source disposed on the light-incident side of the abyss lighting cavity.

[0020] A radially magnetized magnetic ring is coaxially fixed to the outer circumference of the turntable spindle. The magnetic poles of the ring are evenly distributed radially, and the number of pole pairs matches the rotational speed acquisition resolution of the turntable spindle. The sensing surface of a Hall effect speed sensor maintains a fixed air gap distance with the outer circumference of the radially magnetized magnetic ring, and the sensing direction of the Hall effect speed sensor coincides with the radial magnetization direction of the ring. When the turntable spindle drives the radially magnetized magnetic ring to rotate synchronously, the alternating magnetic poles of the ring pass through the sensing surface of the Hall effect speed sensor, which outputs a square wave signal corresponding to the turntable's rotational frequency. The number of pole pairs in the radially magnetized magnetic ring can be configured according to the required rotational speed acquisition accuracy. A higher number of pole pairs results in more square wave pulses output per revolution of the turntable, leading to higher time resolution for rotational speed acquisition and enabling rapid detection of minute fluctuations in the turntable spindle's rotational speed.

[0021] The output of the Hall effect speed sensor is connected to the signal acquisition pin of the microprocessor, which internally contains a reference speed register. This register stores a reference period value corresponding to the record player's rated operating speed. The reference period value is the time it takes for the turntable spindle to rotate one revolution at the record player's rated steady-state speed. The microprocessor receives the real-time pulse signal acquired by the Hall effect speed sensor, extracts the duration of adjacent periods of the real-time pulse signal as the real-time pulse period, and calculates the difference between the real-time pulse period and the reference period value stored in the reference speed register to obtain the speed deviation value. The quantification of the speed deviation value uses the following formula:

[0022] in, This is the speed deviation value. For real-time pulse period, The reference cycle value stored in the reference speed register. When When the value is positive, it indicates that the real-time speed of the turntable spindle is lower than the rated steady-state speed; when... A negative value indicates that the real-time speed of the turntable spindle is higher than the rated steady-state speed; when When the value is 0, it means that the real-time speed of the turntable spindle is consistent with the rated steady-state speed.

[0023] The microprocessor converts the rotational speed deviation into two pulse-width modulation (PWM) signals with opposite polarities. Specifically, the PWM generator inside the microprocessor determines the duty cycle of the PWM signal based on the absolute value of the rotational speed deviation, and determines the polarity of the two PWM signals based on the sign of the deviation. When the rotational speed deviation is positive, the duty cycle of the first PWM signal is positively correlated with the absolute value of the deviation, while the second PWM signal remains low. When the rotational speed deviation is negative, the duty cycle of the second PWM signal is positively correlated with the absolute value, while the first PWM signal remains low, thus forming two PWM signals with opposite polarities. The frequencies of the two PWM signals are kept consistent, and the frequency values ​​are calibrated based on the magnetic field response characteristics of the transparent magnetic fluid to ensure that the switching frequency of the PWM signals matches the migration rate of the magnetic nanoparticles in the transparent magnetic fluid.

[0024] Two pulse-width modulation (PWM) signals of opposite polarity are input to the two control terminals of the H-bridge driver circuit, whose output is connected to the electromagnetic induction coil. The H-bridge driver circuit contains four power switches forming a full-bridge topology. The first PWM signal controls the on / off state of two diagonally opposite power switches in the full-bridge topology, while the second PWM signal controls the on / off state of the other diagonally opposite pair of power switches. When the first PWM signal is active, the output of the H-bridge driver circuit supplies a drive current of the first polarity to the electromagnetic induction coil; when the second PWM signal is active, the output supplies a drive current of the second polarity to the electromagnetic induction coil. The first and second polarities are opposite, thus creating an alternating drive current within the electromagnetic induction coil. The amplitude of the drive current is positively correlated with the duty cycle of the PWM signal, and the alternation frequency of the drive current is consistent with the switching frequency of the PWM signal.

[0025] An electromagnetic induction coil is positioned around the outer wall of the abyss light cavity, which is a cylindrical cavity structure open at both ends. The central axis of the cavity is parallel to the central axis of the turntable spindle. The abyss light cavity is made of a high-transmittance polymer material. Except for the light-transmitting areas on the light-incident and light-excising sides, the inner wall of the cavity is coated with a metal reflective film with a reflectivity greater than 95%, used for total internal reflection confinement of side-scattered light beams. When an alternating driving current is applied to the electromagnetic induction coil, an alternating magnetic field distributed along the central axis of the cavity is excited within the abyss light cavity space inside the coil. The magnetic field strength is positively correlated with the amplitude of the driving current, and the alternation frequency of the alternating magnetic field is consistent with the switching frequency of the driving current.

[0026] A transparent magnetic fluid is contained within the enclosed space of the abyss light cavity. This fluid contains magnetic nanoparticles that can be driven by a magnetic field. Both ends of the abyss light cavity are sealed with high-transmittance end caps to prevent leakage of the transparent magnetic fluid while ensuring normal beam incidence and emission. When an alternating magnetic field acts on the transparent magnetic fluid, the magnetic nanoparticles are subjected to a magnetic force along the direction of the magnetic field lines, causing them to migrate towards areas of higher magnetic field strength. This creates a concentration gradient distribution of magnetic nanoparticles along the central axis of the cavity, corresponding to the density gradient distribution of the transparent magnetic fluid. Specifically, areas with higher magnetic field strength have a higher concentration of magnetic nanoparticles and a greater density of the transparent magnetic fluid; conversely, areas with lower magnetic field strength have a lower concentration of magnetic nanoparticles and a smaller density of the transparent magnetic fluid. The density and refractive index of the transparent magnetic fluid satisfy the Lorentz-Lorentz equation, and the density gradient distribution is directly converted into a refractive index gradient distribution along the beam propagation direction, as shown in the following formula:

[0027] Where n is the refractive index of the transparent magnetic fluid, and K is a constant related to the polarizability of the medium molecules. The density of the transparent magnetic fluid.

[0028] An LED light source is positioned on the light-incident side of the abyss light cavity, which is the end of the cavity furthest from the turntable. The light beam emitted by the LED light source is incident along the central axis of the cavity, penetrates the transparent magnetic fluid, and exits from the light-exit side, which is the end of the cavity closest to the turntable. The emitted beam is projected onto the turntable surface. A diffuse reflection layer is provided on the turntable surface, with a diffuse reflectivity greater than 90% for the incident light beam, causing the projected scattered beam to form a uniform, visible halo on the turntable surface. When the transparent magnetic fluid is in a state without an external magnetic field, the internal magnetic nanoparticles are uniformly dispersed, and the refractive index of the fluid remains uniform along the incident direction of the light beam. Therefore, when the light beam emitted by the LED light source penetrates the fluid, only weak transmission occurs, with no significant lateral scattering. When a transparent magnetic fluid forms a density gradient distribution along the light path under the influence of an alternating magnetic field, the refractive index of the fluid continuously changes along the incident direction of the light beam. As the light beam propagates through this medium with its varying refractive index, it interacts with the internal magnetic nanoparticles, resulting in Rayleigh scattering. The side-scattered light beam formed by Rayleigh scattering propagates radially outward from the cavity. After multiple reflections by the metal reflective film on the inner wall of the cavity, it forms multiple continuous scattered light bands along the incident direction. These multiple scattered light bands are projected onto the surface of the rotating disk, forming a halo layered structure. The number of layers, the spacing between layers, and the halo radius of this halo layered structure change synchronously with the rotational speed deviation. The larger the absolute value of the rotational speed deviation, the stronger the alternating magnetic field, the more significant the density gradient change of the transparent magnetic fluid, the higher the intensity of Rayleigh scattering, the more layers the halo layered structure has, and the smaller the spacing between layers.

[0029] Table 1. Correspondence between speed deviation and system output parameters

[0030] Table 1 shows the correspondence between the rotational speed deviation value and the output parameters of each component of the system in this embodiment. Through this correspondence, the direct mapping logic between the real-time rotational speed fluctuation of the turntable spindle and the halo layered structure can be clearly defined. Those skilled in the art can adjust the mapping range between the value of the reference speed register and the rotational speed deviation value based on this correspondence and the rated speed parameters of the record player, so as to achieve synchronous response between the halo layered structure and the rotational speed fluctuation of the turntable.

[0031] In this embodiment, the real-time rotation parameters of the turntable spindle are collected by a radially magnetized magnetic ring and a Hall effect speed sensor. The microprocessor processes the data to obtain the speed deviation value and converts it into two pulse width modulation signals with opposite polarities. The H-bridge drive circuit drives the electromagnetic induction coil to generate an alternating magnetic field. The alternating magnetic field drives the transparent magnetic fluid to form a density gradient distribution along the optical path, causing the light beam emitted by the LED light source to produce Rayleigh scattering and form a halo layered structure on the turntable surface. This realizes the direct conversion of the mechanical speed fluctuation of the turntable into the spatial distribution of the optical path, and constructs a physical feedback closed loop of sound, light, and electricity.

[0032] In a preferred embodiment, reference Figure 2 and Figure 3 The microprocessor also includes a digital low-pass filter and a pulse edge capture timer. The Hall effect speed sensor outputs a square wave speed signal to the microprocessor. This signal is then input to the digital low-pass filter, which removes mechanical vibration noise above a preset frequency. The filtered square wave speed signal is then input to the pulse edge capture timer.

[0033] The digital low-pass filter is an adaptive sliding window filter based on a first-order lag algorithm. The window length of the adaptive sliding window filter has a dynamically negatively correlated mapping relationship with the preset steady-state tolerance interval. The quantization calculation of the first-order lag filtering algorithm is performed using the following formula:

[0034] in, This represents the filtered pulse period value after the nth sampling. This represents the original pulse period value from the nth sample. These are the filter coefficients. The value range is from 0 to 1. The value of is negatively correlated with the window length of the adaptive sliding window filter. Filter coefficients Used to adjust the smoothness of the filtering process. The larger the value, the stronger the follower of the original sampled signal after filtering, and the weaker the ability to filter out high-frequency noise. The smaller the value, the smoother the filtered signal and the stronger its ability to filter out high-frequency noise. The window length of an adaptive sliding window filter is the number of consecutive sampling points involved in the filtering operation. The longer the window length, the more sampling points participate in the operation, and the higher the filtering coefficients. The smaller the value, the smoother the filtering; the shorter the window length, the fewer the number of sampling points involved in the calculation, and the lower the filter coefficient. The larger the value, the stronger the signal tracking ability of the filter.

[0035] The preset steady-state tolerance range is a pre-configured range that allows for fluctuations in the real-time pulse period relative to the reference period. When the absolute value of the difference between the real-time pulse period and the reference period is within the preset steady-state tolerance range, the turntable is determined to be in a steady-state operating state; when the absolute value of the difference exceeds the preset steady-state tolerance range, the turntable is determined to be in a speed fluctuation state. The window length of the adaptive sliding window filter has a dynamic negative correlation with the preset steady-state tolerance range. Specifically, the larger the value of the preset steady-state tolerance range, the shorter the window length; the smaller the value of the preset steady-state tolerance range, the longer the window length. When the record player reads a classical music record with a large dynamic range, the preset steady-state tolerance range is configured as the first threshold, the window length of the adaptive sliding window filter is shortened to 3 sampling points, and the filter coefficient... Adjusted to 0.7, the high-frequency tracking fluctuation component in the rotation speed square wave signal is retained, enabling the halo layered structure to respond to the tracking speed fluctuation corresponding to the large dynamic range signal of the record; when the record player reads a low dynamic range audio record, the preset steady-state tolerance interval is configured as the second threshold, the value of the second threshold is less than the first threshold, the window length of the adaptive sliding window filter is extended to 8 sampling points, and the filter coefficient is... Adjusted to 0.2, the low-frequency mechanical substrate noise in the rotational speed square wave signal is deeply filtered out to avoid unnecessary fluctuations in the halo layering structure during steady-state operation.

[0036] Table 2. Correspondence between record type and filter parameter configuration High dynamic range classical music ±8 3 0.7 120 Pop music ±5 5 0.45 60 Low dynamic range audio records ±3 8 0.2 25 vinyl test disc ±6 4 0.55 80

[0037] Table 2 shows the filter parameter configuration relationship for different types of records in this embodiment. Those skilled in the art can adjust the threshold of the preset steady-state tolerance range according to the dynamic range characteristics of the record, and adaptively match the window length and filter coefficient of the filter. While retaining the effective tracking speed fluctuation component, it filters out non-tracking mechanical vibration noise and avoids false triggering scattering of transparent magnetic fluid.

[0038] The filtered rotational speed square wave signal is input to the pulse edge capture timer, which is configured for rising edge triggering. When a rising edge of the rotational speed square wave signal is detected, the timer is triggered to capture the signal, recording the current count value. The difference between the count values ​​corresponding to two adjacent rising edges is converted into the time interval between those two rising edges, which is the real-time pulse period. The pulse edge capture timer is configured as a 16-bit up-counting timer. The timer's counting clock frequency is the frequency of the microprocessor's system clock after frequency division. The counting frequency is calibrated according to the resolution requirements of the rotational speed acquisition to ensure that the time resolution of the count value can cover the detection range of the turntable rotational speed fluctuations.

[0039] The microprocessor performs a difference calculation between the real-time pulse period and the reference period in the reference speed register to obtain the absolute value of the difference. When the absolute value of the difference exceeds the preset steady-state tolerance range, the microprocessor triggers the deviation calculation interrupt service routine, suspending the currently executing low-priority tasks and prioritizing the calculation of the speed deviation value and the update operation of the pulse width modulation signal. The absolute value of the difference is then output as the speed deviation value to the pulse width modulation generator. The interrupt priority of the deviation calculation interrupt service routine is higher than other peripheral interrupts within the microprocessor, only lower than the system reset interrupt, ensuring that the processing delay of the speed deviation signal is within the preset range. This avoids large fluctuations in speed during the turntable startup phase or non-tracking mechanical vibrations caused by scratches on the record surface, which could lead to incorrect speed signal acquisition and subsequent false triggering scattering by the transparent magnetic fluid. This ensures that the response of the halo layered structure corresponds only to the effective speed fluctuations generated during the record tracking process.

[0040] The microprocessor integrates a dual-channel advanced timer, which includes a first comparator register and a second comparator register. These registers correspond to the output channels of two pulse width modulation (PWM) signals, respectively. The microprocessor maps the absolute value of the speed deviation to a duty cycle adjustment, and the sign of the speed deviation to a phase control flag. The quantization calculation of the duty cycle adjustment uses the following formula:

[0041] Where D is the duty cycle of the pulse width modulation signal. To minimize the duty cycle, For duty cycle mapping coefficients, This is the absolute value of the speed deviation. Minimum duty cycle. The duty cycle mapping coefficient is the minimum duty cycle value at which an electromagnetic induction coil can drive a transparent magnetic fluid to produce a detectable density change. As a pre-calibrated proportionality coefficient between the absolute value of the rotational speed deviation and the duty cycle increment, those skilled in the art can adjust the duty cycle mapping coefficient based on the inductance parameters of the electromagnetic induction coil and the magnetic field response characteristics of the transparent magnetic fluid. The value.

[0042] When the phase control flag is positive, the first comparator register outputs a high level and the second comparator register outputs a low level. The first output channel of the dual-channel advanced timer outputs a pulse width modulation signal corresponding to the duty cycle, while the second output channel remains low. When the phase control flag is negative, the first comparator register outputs a low level and the second comparator register outputs a high level. The second output channel of the dual-channel advanced timer outputs a pulse width modulation signal corresponding to the duty cycle, while the first output channel remains low. This achieves the output of two pulse width modulation signals with opposite polarities.

[0043] The dual-channel advanced timer inserts a fixed-length dead-time delay during the state transition between the first and second comparator registers. The dead-time delay is the time interval between the completion of the output state transition of the first comparator register and the start of the output state transition of the second comparator register. The duration of the dead-time delay is greater than the turn-off delay of the power switches in the H-bridge driver circuit. The quantization constraint for the dead-time delay is expressed by the following formula:

[0044] in, Extend the dead zone duration. This is the maximum turn-off delay time for the power switches in the H-bridge driver circuit. During the dead-time delay interval, both the first and second comparator registers output a low level, and all four power switches in the H-bridge driver circuit are in the off state, thereby eliminating the risk of shoot-through short circuits between two power switches on the same bridge arm in the H-bridge driver circuit.

[0045] In this embodiment, a digital low-pass filter is used to filter out non-tracking mechanical vibration noise in the rotational speed square wave signal. Combined with a pulse edge capture timer, the real-time pulse period is accurately extracted. A deviation calculation interrupt service routine ensures the real-time performance of rotational speed deviation processing. A dual-channel advanced timer is used to generate two pulse width modulation signals with opposite polarities, and a dead-time delay is inserted during state switching. At the same time, an adaptive sliding window filter is used to dynamically match the filtering requirements of different types of records, ensuring the accuracy of rotational speed deviation extraction, the safety of hardware operation, and the system's adaptability to different record types. This avoids false triggering scattering by transparent magnetic fluid and maintains the stable response of the halo layered structure.

[0046] In a preferred embodiment, reference Figures 4 to 6 The electromagnetic induction coil includes a primary winding spirally wound along the outer wall of the abyss light cavity and a secondary winding spirally wound in the opposite direction around the primary winding. The two ends of the primary winding are connected to the first and second output terminals of the H-bridge drive circuit, while the two ends of the secondary winding are suspended and connected to damping absorption resistors. The primary and secondary windings are wound on a coil frame made of polyetheretherketone (PEEK). The coil frame has a cylindrical structure, with its inner wall interference-fitted to the outer wall of the abyss light cavity. The outer wall of the coil frame has two layers of spiral winding slots: the inner slot for winding the primary winding and the outer slot for winding the secondary winding. The primary winding is wound clockwise, and the secondary winding is wound counterclockwise. An insulating layer is placed between the two layers of winding slots to prevent short circuits between the primary and secondary windings.

[0047] When the primary winding is energized, a basic axial driving magnetic field is excited inside the abyss light cavity. The magnetic field direction of the basic axial driving magnetic field is distributed along the central axis of the abyss light cavity. The magnetic induction intensity along the central axis of the cavity is quantitatively calculated using the following formula:

[0048] in, Let Z be the magnetic flux density at position z along the central axis of the cavity. Let N be the vacuum permeability, I be the number of turns in the primary winding, R be the amplitude of the driving current in the primary winding, and z be the position coordinate along the central axis of the cavity. When the driving current in the primary winding changes, the magnetic flux of the basic axial driving magnetic field changes. Under the action of the changing magnetic flux, the secondary winding generates an induced electromotive force. The induced electromotive force generates a reverse induced current in the closed loop formed by the secondary winding and the damping absorption resistor. When the reverse induced current flows through the secondary winding, it generates a reverse compensation magnetic field that is opposite to the direction of the edge divergence component of the basic axial driving magnetic field. The reverse compensation magnetic field cancels out the edge divergence component of the basic axial driving magnetic field, confining the basic axial driving magnetic field within the limited area of ​​the central axis of the abyss light cavity. This confines the transparent magnetic fluid within the limited area of ​​the central axis of the abyss light cavity to prevent the transparent magnetic fluid from unnecessary migration along the radial direction of the cavity due to the edge divergence of the magnetic field, thus ensuring the uniformity of the density gradient distribution along the optical path. The resistance value of the damping absorption resistor is calibrated according to the inductance parameters of the secondary winding. It is used to adjust the decay rate of the reverse induced current and avoid oscillation of the reverse compensation magnetic field.

[0049] The inner wall of the electromagnetic induction coil is fitted with a high-permeability permalloy shielding layer, the inner surface of which is coated with an electrically insulating magnesium oxide coating. A spiral cooling channel is formed on the inner wall of the coil frame, with the pitch of the channel matching that of the primary winding. Cooling water circulates through the spiral cooling channel. The high-permeability permalloy shielding layer is a thin-walled cylindrical structure with a relative permeability much higher than that of air. The leakage flux generated by the primary and secondary windings preferentially forms a closed magnetic circuit along the high-permeability permalloy shielding layer. Combined with the electrical insulation of the electrically insulating magnesium oxide coating, this confines the leakage flux within the closed physical gap between the coil frame and the high-permeability permalloy shielding layer, preventing the leakage flux from radiating into the space where the record player's pickup head is located. This avoids the leakage flux inducing interference signals in the pickup head's signal amplification circuit, thus preventing the introduction of electromagnetic interference audio noise. The electrically insulating magnesium oxide coating also has thermal conductivity, which can transfer the heat generated by the coil winding to the spiral cooling channel. The cooling circulating water removes the Joule heat generated during the energization of the primary and secondary windings, maintains the temperature stability of the coil winding, avoids changes in coil resistance due to increased winding temperature, and thus avoids unnecessary fluctuations in drive current and magnetic field strength, ensuring the stability of the density gradient change of the transparent magnetic fluid.

[0050] The transparent magnetic fluid comprises a carrier liquid and a mixture of nano-iron oxide (Fe3O4) particles and nano-boron nitride (Bnit) sheets uniformly suspended within the carrier liquid. The average particle size of the nano-iron oxide particles is 10 to 15 nanometers, and the radial size of the Bnit) sheet mixture is 50 to 80 nanometers. The carrier liquid is a mixture of dimethyl silicone oil and fluorinated vegetable oil in a volume ratio, and its dynamic viscosity at 25°C is in the range of 50 mPa·s to 100 mPa·s. The nano-iron oxide particles are prepared by a chemical co-precipitation method, and after preparation, the surface is modified with oleic acid to ensure uniform dispersion of the nano-iron oxide particles in the carrier liquid and prevent agglomeration. The nano-iron oxide particles are superparamagnetic particles, which can quickly migrate in response to the magnetic field force under the action of an external magnetic field, and have no remanence when the external magnetic field is removed, and can quickly return to a uniformly dispersed state. The mixture of boron nitride nanosheets was prepared by liquid-phase exfoliation. The exfoliated sheets were then surface-modified with a silane coupling agent to improve their dispersibility in the carrier fluid. The boron nitride nanosheets have a two-dimensional sheet structure. Under the action of an alternating magnetic field, they align along the magnetic field lines, forming a continuous low-resistance slip surface inside the carrier fluid. This reduces the internal fluid shear resistance of the transparent magnetic fluid during density gradient distribution changes, increases the migration rate of the nano-Fe3O4 particles, and thus improves the response speed of the transparent magnetic fluid to the alternating magnetic field.

[0051] A flexible polyimide film heating element is embedded at the bottom of the abyss light cavity, and a positive temperature coefficient (PTC) thermistor is attached to its surface. The two ends of the PTC thermistor are connected to the non-inverting input of a comparator amplifier circuit, the inverting input of which is connected to a reference voltage, and the output of which is connected to the base of a power switching transistor. The collector of the power switching transistor is connected to the power supply circuit of the flexible polyimide film heating element. The resistance of the PTC thermistor increases with increasing ambient temperature and decreases with decreasing ambient temperature. The temperature of the transparent magnetic fluid inside the abyss light cavity remains consistent with the temperature of the PTC thermistor. The dynamic viscosity of the carrier fluid is quantitatively related to temperature using the following formula:

[0052] in, Let T be the dynamic viscosity of the carrier fluid at temperature T. Reference temperature The dynamic viscosity of the time-based carrier fluid, Let T be the viscous flow activation energy of the carrier liquid, and T be the thermodynamic temperature of the carrier liquid. The reference thermodynamic temperature is used. When the temperature of the transparent magnetic fluid is lower than the temperature threshold corresponding to the reference voltage, the resistance value of the positive temperature coefficient thermistor is lower than the reference resistance value corresponding to the reference voltage. The voltage at the non-inverting input terminal of the comparator amplifier circuit is lower than the reference voltage at the inverting input terminal. The comparator amplifier circuit outputs a high-level signal, driving the power switch to conduct. The power supply circuit of the flexible polyimide film heating element is then activated, causing the flexible polyimide film heating element to generate heat, raising the temperature inside the abyss light cavity, compensating for the viscosity increase of the transparent magnetic fluid in a low-temperature environment, and maintaining the magnetic field response rate of the nano-iron oxide particles. When the temperature of the transparent magnetic fluid is higher than the temperature threshold corresponding to the reference voltage, the resistance value of the positive temperature coefficient thermistor is higher than the reference resistance value. The voltage at the non-inverting input terminal of the comparator amplifier circuit is higher than the reference voltage at the inverting input terminal. The comparator amplifier circuit outputs a low-level signal, the power switch is turned off, the power supply circuit of the flexible polyimide film heating element is disconnected, and heating stops. This maintains the temperature of the transparent magnetic fluid within the preset operating temperature range, avoiding the decrease in the migration rate of the nano-iron oxide particles due to the increase in the viscosity of the carrier liquid at low temperatures, and ensuring the stability of the magnetic field response characteristics of the transparent magnetic fluid.

[0053] The light source is a narrowband blue LED array with a peak emission wavelength in the range of 450 nm to 470 nm. The central beam of the light emitted by the narrowband blue LED array passes perpendicularly through the central region of a transparent magnetic fluid. The nanoparticles within the transparent magnetic fluid are in a state of disordered Brownian motion in the absence of an external magnetic field. When the light beam from the narrowband blue LED array penetrates the disordered transparent magnetic fluid, it undergoes weak forward scattering, with most of the beam directly transmitted to the surface of the rotating disk. When the transparent magnetic fluid forms a density gradient distribution under the influence of an alternating magnetic field, the nanoparticles form a periodically gradually changing refractive index structure along the beam penetration direction. As the light beam emitted by the narrowband blue LED array propagates through this periodically gradually changing refractive index structure, it undergoes Rayleigh scattering with the nanoparticles, exciting a lateral Rayleigh scattered beam. The Rayleigh scattering cross-section of a single nanoparticle is quantitatively calculated using the following formula:

[0054] in, The Rayleigh scattering cross section of a single nanoparticle. The wavelength of the incident light in a vacuum. Where is the radius of the nanoparticle. The refractive index of the nanoparticles. The refractive index of the carrier liquid is given. The scattering cross section of Rayleigh scattering is inversely proportional to the fourth power of the incident light wavelength. Narrow-band blue light has a short wavelength, corresponding to a large Rayleigh scattering cross section, resulting in high intensity of side-scattered light and the formation of a clear halo layered structure.

[0055] In a preferred embodiment, the light-emitting diode (LED) light source comprises an array of red LEDs, green LEDs, and narrow-band blue LEDs arranged sequentially along the depth direction of the abyss light cavity. The nanoparticles within the transparent magnetic fluid exhibit a gradient distribution with increasing particle size along the depth direction of the abyss light cavity, with the smallest particle size near the red LEDs and the largest particle size near the narrow-band blue LED array. Multiple porous isolation membranes are disposed within the abyss light cavity along the depth direction, with the pore size decreasing sequentially along the depth direction, the smallest pore size near the light-incident side and the largest pore size near the light-exit side. During the preparation of the transparent magnetic fluid, nanoparticles of different sizes are dispersed in a carrier liquid and sequentially injected into different isolation regions of the cavity to maintain the long-term stability of the particle size gradient distribution. The long-wavelength light beam emitted by the red LEDs is weakly scattered in the smallest nanoparticle region, and most of the beam penetrates the entire transparent magnetic fluid to reach the surface of the turntable, forming the bottom red halo; the medium-wavelength light beam emitted by the green LEDs is moderately laterally scattered in the medium-sized nanoparticle region, forming the middle green light scattering layer; the short-wavelength light beam emitted by the narrow-band blue LED array is strongly laterally Rayleigh scattered in the largest nanoparticle region, forming the top blue light scattering layer, thus constructing an abyss light effect with physical depth color transition.

[0056] Table 3. Correspondence between incident light wavelength, nanoparticle size, and scattering properties

[0057] Table 3 shows the correspondence between incident light of different wavelengths, corresponding matching nanoparticle particle sizes and scattering characteristics in this embodiment. Those skilled in the art can adjust the arrangement position of light-emitting diodes of different wavelengths and the nanoparticle size gradient distribution inside the transparent magnetic fluid according to this correspondence, match the scattering intensity of light beams of different wavelengths, and construct abyss light effects with different color transition effects.

[0058] In this embodiment, a primary winding and a reverse-wound secondary winding, combined with a damping absorption resistor, generate a reverse compensating magnetic field to constrain the density change region of the transparent magnetic fluid. A high-permeability permalloy shielding layer blocks leakage flux radiation to the pickup head, avoiding the introduction of electromagnetic interference audio noise. The combination of nano-iron oxide particles and nano-boron nitride sheets reduces the internal shear resistance of the transparent magnetic fluid, improving the magnetic field response rate. Combined with the temperature control structure of the flexible polyimide film heating element, it compensates for the increase in fluid viscosity at low temperatures, maintaining the stability of the fluid's response characteristics. A narrow-band blue light-emitting diode array is matched with the Rayleigh scattering characteristics of nanoparticles to form a clear halo layered structure. Combined with multi-color light-emitting diodes arranged along the depth direction and the gradient distribution of nanoparticle size, a deep-sea light effect with physical depth color transition is constructed, further improving the system's operational stability and light effect performance.

Claims

1. A system for processing the abyss lighting effects structure of a record player, characterized in that, It includes a radially magnetized magnetic ring fixed to the main shaft of the turntable, a Hall speed sensor disposed on the outside of the radially magnetized magnetic ring, a microprocessor, an H-bridge drive circuit, an electromagnetic induction coil disposed around the abyss light cavity, a transparent magnetic fluid contained in the abyss light cavity, and a light-emitting diode light source disposed on the light-incident side of the abyss light cavity. The output terminal of the Hall speed sensor is connected to the signal acquisition pin of the microprocessor. The microprocessor is equipped with a reference speed register. The microprocessor subtracts the real-time pulse period acquired by the Hall speed sensor from the value of the reference speed register to obtain the speed deviation value, and converts the speed deviation value into two pulse width modulation signals with opposite polarities. The two pulse width modulation signals with opposite polarities are respectively input to the two control terminals of the H-bridge drive circuit, and the output terminal of the H-bridge drive circuit is connected to the electromagnetic induction coil. The alternating magnetic field generated by the electromagnetic induction coil drives the transparent magnetic fluid to change its density gradient distribution along the optical path. When the light beam emitted by the light-emitting diode light source penetrates the transparent magnetic fluid, Rayleigh scattering occurs, forming a halo layered structure on the surface of the turntable.

2. The abyss lighting effect structure processing system for a record player according to claim 1, characterized in that, The microprocessor is also equipped with a digital low-pass filter and a pulse edge capture timer. The Hall speed sensor outputs a speed square wave signal to the microprocessor. The speed square wave signal is input to the digital low-pass filter to filter out mechanical vibration noise higher than a preset frequency. The filtered speed square wave signal is then input to the pulse edge capture timer. The pulse edge capture timer records the time interval between two adjacent rising edges as the real-time pulse period; When the absolute value of the difference between the real-time pulse period and the reference period in the reference speed register exceeds the preset steady-state tolerance range, the microprocessor triggers the deviation calculation interrupt service routine and outputs the absolute value of the difference as the speed deviation value to the pulse width modulation generator.

3. The abyss lighting effect structure processing system for a record player according to claim 1, characterized in that, The microprocessor integrates a dual-channel advanced timer, which includes a first comparison register and a second comparison register. The microprocessor maps the absolute value of the speed deviation value to a duty cycle adjustment amount, and maps the positive or negative sign of the speed deviation value to a phase control flag; When the phase control flag is positive, the first comparator register outputs a high level and the second comparator register outputs a low level. When the phase control flag is negative, the first comparator register outputs a low level and the second comparator register outputs a high level. The dual-channel advanced timer inserts a dead time delay of fixed duration during the state switching process between the first comparator register and the second comparator register. The dead time delay is used to eliminate the risk of shoot-through short circuit between the two power switches on the same bridge arm in the H-bridge drive circuit.

4. The abyss lighting effect structure processing system for a record player according to claim 1, characterized in that, The electromagnetic induction coil includes a primary winding spirally wound along the outer wall of the abyss light cavity and a secondary winding spirally wound in the opposite direction around the outside of the primary winding. The two ends of the primary winding are connected to the first output terminal and the second output terminal of the H-bridge drive circuit, and the two ends of the secondary winding are left floating and connected to a damping absorption resistor. When the primary winding is energized, it excites a basic axial driving magnetic field inside the abyss light cavity. When the basic axial driving magnetic field changes, the secondary winding generates a reverse induced current. The reverse induced current flows through the damping absorption resistor to form a reverse compensation magnetic field that cancels the edge divergence component of the basic axial driving magnetic field, thereby constraining the transparent magnetic fluid to undergo density gradient distribution changes within a defined area of ​​the central axis of the abyss light cavity.

5. The abyss lighting effect structure processing system for a record player according to claim 1, characterized in that, The transparent magnetic fluid includes a base fluid and a mixture of nano-iron oxide particles and nano-boron nitride sheets uniformly suspended inside the base fluid. The average particle size of the nano-iron oxide particles is 10 to 15 nanometers, and the radial dimension of the nano-boron nitride sheet mixture is 50 to 80 nanometers. The carrier fluid is a mixture of dimethyl silicone oil and fluorinated vegetable oil in a volume ratio, and the dynamic viscosity of the carrier fluid at 25 degrees Celsius is in the range of 50 mPascals to 100 mPascals. The nano-boron nitride sheet mixture aligns along the magnetic field lines under the action of the alternating magnetic field.

6. The abyss lighting effect structure processing system for a record player according to claim 1, characterized in that, The light-emitting diode light source is a narrowband blue light-emitting diode array with an emission peak wavelength in the range of 450 nanometers to 470 nanometers; The central beam of the light emitted by the narrow-band blue light-emitting diode array passes perpendicularly through the central region of the transparent magnetic fluid. The nanoparticles inside the transparent magnetic fluid are in a state of disordered Brownian motion when there is no external magnetic field. When the light beam emitted by the narrow-band blue light-emitting diode array penetrates the disordered transparent magnetic fluid, it undergoes weak forward scattering. When the transparent magnetic fluid forms the density gradient distribution change under the action of the alternating magnetic field, the nanoparticles form a periodically changing refractive index structure along the light beam penetration direction, and the light beam emitted by the narrow-band blue light-emitting diode array excites a lateral Rayleigh scattering beam in the periodically changing refractive index structure.

7. The abyss lighting effect structure processing system for a record player according to claim 2, characterized in that, The digital low-pass filter is an adaptive sliding window filter based on a first-order hysteresis algorithm. The window length of the adaptive sliding window filter has a dynamic negative correlation with the preset steady-state tolerance interval. When the record player reads a classical music record with a large dynamic range, the preset steady-state tolerance range is configured as the first threshold, and the window length of the adaptive sliding window filter is shortened to 3 sampling points to retain the high-frequency tracking fluctuation component in the speed square wave signal. When the record player reads a low dynamic range audio record, the preset steady-state tolerance range is configured as a second threshold, and the window length of the adaptive sliding window filter is extended.

8. The abyss lighting effect structure processing system for a record player according to claim 4, characterized in that, The inner wall of the electromagnetic induction coil is fitted with a high permeability permalloy shielding layer, and the inner surface of the high permeability permalloy shielding layer is coated with an electrically insulating magnesium oxide coating. The primary winding and the secondary winding are wound on a coil frame made of polyetheretherketone material. The inner wall of the coil frame is provided with a spiral cooling channel, and cooling circulating water is introduced into the spiral cooling channel. The high permeability permalloy shielding layer, together with the electrically insulating magnesium oxide coating, confines the leakage flux generated by the primary winding and the secondary winding within the closed physical gap between the coil frame and the high permeability permalloy shielding layer, thus blocking the leakage flux from radiating into the space where the phonograph pickup head is located, in order to avoid introducing electromagnetic interference audio background noise.

9. The abyss lighting effect structure processing system for a record player according to claim 5, characterized in that, The bottom of the abyss light cavity is fitted with a flexible polyimide film heating element, and a positive temperature coefficient thermistor is attached to the surface of the flexible polyimide film heating element. The two ends of the positive temperature coefficient thermistor are connected to the non-inverting input of the comparator amplifier circuit, the inverting input of the comparator amplifier circuit is connected to the reference voltage, the output of the comparator amplifier circuit is connected to the base of the power switch transistor, and the collector of the power switch transistor is connected to the power supply circuit of the flexible polyimide film heating element. When the temperature of the transparent magnetic fluid inside the abyss light cavity is lower than the temperature threshold corresponding to the reference voltage, the flexible polyimide film heating element is energized to generate heat, compensating for the viscosity increase of the transparent magnetic fluid in the low-temperature environment in order to maintain the magnetic field response rate of the nano-iron oxide particles.

10. The abyss lighting effect structure processing system for a record player according to claim 6, characterized in that, The light-emitting diode light source consists of a red light-emitting diode, a green light-emitting diode, and a narrow-band blue light-emitting diode array arranged sequentially along the depth direction of the abyss light cavity. The nanoparticles inside the transparent magnetic fluid exhibit a gradient distribution with increasing particle size along the depth direction. The nanoparticles closer to the red light-emitting diode have the smallest particle size, while the nanoparticles closer to the narrow-band blue light-emitting diode array have the largest particle size. The long-wavelength light beam emitted by the red light-emitting diode undergoes weak scattering in the region of the smallest nanoparticles and reaches the surface of the turntable to form a bottom red halo. The short-wavelength light beam emitted by the narrow-band blue light-emitting diode array undergoes strong lateral Rayleigh scattering in the region of the largest nanoparticles to form a top blue light scattering layer, thus creating an abyss light effect with physical depth color transition.

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