Public broadcasting system based on all-optical network

Abstract

The invention relates to the technical field of broadcasting, and provides a public broadcasting system based on an all-optical network, and the system comprises a first conversion module which is used for collecting a sound signal of a current scene, and converting the sound signal into a first optical signal; the second conversion module is used for converting the first optical signal into a first electric signal and processing the first electric signal, and transmitting the processed first optical signal through an all-fiber network to obtain a second optical signal; the first amplification module is used for amplifying the second optical signal to obtain an amplified third optical signal; the signal filtering module is used for processing the third optical signal and filtering a noise signal of the third optical signal to obtain a fourth optical signal; the second amplification module is used for converting the fourth optical signal into a second electric signal and transmitting the second electric signal to power amplification equipment for amplification; and the public broadcast module is used for transmitting the amplified second electric signal to a loudspeaker for broadcasting. According to the invention, the pickup effect and the confidentiality of information transmission can be improved.

Description

Technical Field

[0001] The present invention relates to the field of broadcasting technology, and in particular to a public broadcasting system, method and electronic equipment based on an all-optical network. Background Art

[0002] Nowadays, public broadcasting systems are widely used in various places, such as airports, stations, schools, shopping malls, etc. These systems mainly rely on traditional wired or radio transmission technology to transmit audio signals. In terms of sound pickup technology, electroacoustic pickup devices, such as microphones, are usually used to transmit to the control center through cables or wireless signals, and then the sound is amplified by power amplifiers and transmitted to various speakers for broadcasting. In order to ensure the stability and reliability of transmission, many systems have adopted multiple backup measures.

[0003] However, traditional electroacoustic pickup equipment is easily disturbed by background noise in complex environments, affecting the sound quality and clarity of information transmission. Secondly, the existing signal transmission method has loopholes in confidentiality, and electromagnetic signals are easily intercepted or interfered with, especially in the case of wireless transmission, and information security is difficult to be effectively guaranteed.

[0004] Therefore, there is an urgent need for a new public broadcasting system based on an all-optical network to improve the sound pickup effect and the confidentiality of information transmission, and to ensure stable operation in various complex environments. Summary of the invention

[0005] The present invention aims at the technical problems existing in the prior art and provides a public broadcasting system, method and electronic equipment based on an all-optical network, which can improve the sound pickup effect and the confidentiality of information transmission.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] Furthermore, the second conversion module is further specifically configured to:

[0008] Acquire a conversion coefficient, a noise coefficient, and a system parameter for converting the first optical signal;

[0009] Performing integration processing on the first optical signal to determine an instantaneous rate of change of the first optical signal with respect to time;

[0010] The first optical signal is converted into a first electrical signal according to the instantaneous rate of change of the first optical signal with respect to time, the conversion coefficient, the noise coefficient and the system parameter.

[0011] The second conversion module is further specifically configured to:

[0012] Obtain fiber loss coefficient, fiber length, signal frequency and phase offset of all-optical networks;

[0013] Determining, according to the optical fiber loss coefficient and the optical fiber length, an attenuation factor of the first optical signal propagating in the optical fiber of the all-optical network;

[0014] determining, according to the signal frequency and the phase offset, an oscillation behavior of the first optical signal during propagation in the all-optical network;

[0015] The second optical signal is obtained according to the first optical signal, the attenuation factor and the oscillation behavior.

[0016] The signal filtering module is further specifically configured to: process the third optical signal through a filter transmission function of the filter.

[0017] The present invention also provides a public broadcasting method based on an all-optical network, the method comprising:

[0018] Collecting a sound signal of the current scene through a fiber optic microphone and converting the sound signal into a first light signal;

[0019] The first optical signal is converted into a first electrical signal by a photoelectric converter and processed, and the processed first optical signal is transmitted through an all-optical fiber network to obtain a second optical signal; and quantum key distribution technology is used to encrypt the first optical signal during the transmission process;

[0020] amplifying the second optical signal using an optical amplifier to obtain an amplified third optical signal;

[0021] Processing the third optical signal through a filter to filter out a noise signal of the third optical signal to obtain a fourth optical signal;

[0022] Converting the fourth optical signal into a second electrical signal through a photoelectric converter, and transmitting the second electrical signal to a power amplifier device for amplification;

[0023] The amplified second electrical signal is transmitted to the loudspeaker for broadcasting.

[0024] In addition, to achieve the above objectives, the present invention also proposes an electronic device, comprising: a memory for storing a computer software program; a processor for reading and executing the computer software program, thereby implementing a public broadcasting method based on an all-optical network as described above.

[0025] The beneficial effects of the present invention are:

[0026] (1) The present invention uses an optical fiber microphone to replace the traditional electroacoustic pickup device, avoids electromagnetic interference through optical signal transmission, improves the purity of the signal and the clarity of the sound pickup, and combines the instantaneous change rate with the cumulative change, so that the optical signal can accurately reflect the subtle changes of the sound when it is converted into an electrical signal, thereby improving the sound quality;

[0027] (2) The optical signal of the present invention is not easily intercepted or interfered in the optical fiber. Compared with electromagnetic signal transmission, especially wireless transmission, the security is greatly improved. Quantum key distribution (QKD) technology is used for encryption during the optical signal transmission process to ensure the security of information transmission. Even if the signal is intercepted, it cannot be decrypted, thereby improving information security.

[0028] (3) The optical fiber transmission of the present invention is less affected by external environmental factors (such as electromagnetic interference, weather changes, etc.), and has high transmission stability, which ensures the reliability of the broadcast system. The system can be combined with multiple backup measures (such as redundant optical fiber lines) to further improve the stability and reliability of the system and ensure the continuity of broadcast services;

[0029] (4) The optical fiber material of the present invention is more durable and has a longer service life than traditional cables, which reduces the frequency of maintenance and replacement, thereby reducing maintenance costs. The optical fiber system is not affected by electromagnetic interference, which reduces the probability of failure and further reduces maintenance costs.

[0030] (5) The optical fiber of the present invention has an extremely high bandwidth and can support the transmission of high-quality audio signals, ensuring the excellent broadcast sound quality. The transmission speed of the optical signal in the optical fiber is close to the speed of light, and the delay is extremely low, ensuring the real-time and synchronization of the broadcast signal;

[0031] (6) The present invention is applicable to various complex environments such as airports, stations, schools, shopping centers, etc., especially places with high requirements on signal quality and security. The deployment of fiber optic microphones and all-fiber optic networks is flexible and can meet the needs of different places to provide high-quality broadcasting services.

[0032] In summary, the present invention, by adopting fiber optic microphones and all-optical network transmission technology, can significantly improve the sound pickup effect and confidentiality of information transmission of the public broadcasting system, while improving the reliability of the system, reducing maintenance costs, and ensuring high-quality broadcasting effects, adapting to the needs of various complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A scene diagram of a public broadcasting system based on an all-optical network provided by the present invention;

[0034] Figure 2 A schematic diagram of the structure of a public broadcasting system based on an all-optical network provided by the present invention;

[0035] Figure 3 A flowchart of a public broadcasting method based on an all-optical network provided by the present invention;

[0036] Figure 4 A schematic diagram of the hardware structure of a possible electronic device provided by the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1 , Figure 1 A scene diagram of a public broadcasting system based on an all-optical network provided by the present invention. Figure 1 As shown, the terminal and the server are connected via a network, such as a wired or wireless network connection. The terminal may include but is not limited to portable terminals such as mobile phones and tablets installed with various network platform applications, as well as fixed terminals such as computers, query machines, and advertising machines. The server provides users with various business services, including service push servers, user recommendation servers, etc.

[0039] It should be noted that Figure 1 The scenario diagram of a public broadcasting system based on an all-optical network shown is only an example. The terminal, server and application scenario described in the embodiment of the present invention are intended to more clearly illustrate the technical solution of the embodiment of the present invention, and do not generate any limitation on the technical solution provided by the embodiment of the present invention. Ordinary technicians in this field can know that with the evolution of the system and the emergence of new business scenarios, the technical solution provided by the embodiment of the present invention is also applicable to similar technical problems.

[0040] Among them, the terminal can be used for:

[0041] Collecting a sound signal of the current scene through a fiber optic microphone and converting the sound signal into a first light signal;

[0042] The first optical signal is converted into a first electrical signal by a photoelectric converter and processed, and the processed first optical signal is transmitted through an all-optical fiber network to obtain a second optical signal; and quantum key distribution technology is used to encrypt the first optical signal during the transmission process;

[0043] amplifying the second optical signal using an optical amplifier to obtain an amplified third optical signal;

[0044] Processing the third optical signal through a filter to filter out a noise signal of the third optical signal to obtain a fourth optical signal;

[0045] Converting the fourth optical signal into a second electrical signal through a photoelectric converter, and transmitting the second electrical signal to a power amplifier device for amplification;

[0046] The amplified second electrical signal is transmitted to the loudspeaker for broadcasting.

[0047] See also Figure 2 , Figure 2 A schematic structural diagram of a public broadcasting system based on an all-optical network provided by the present invention.

[0048] like Figure 2 As shown, a public broadcasting system based on an all-optical network proposed in an embodiment of the present invention includes:

[0049] The first conversion module 201 is used to collect the sound signal of the current scene through the optical fiber microphone and convert the sound signal into a first optical signal.

[0050] Among them, the fiber optic microphone is a device that uses fiber optic technology to collect sound signals. Its working principle is different from that of traditional microphones. It mainly detects sound fluctuations through changes in light. Its basic components include:

[0051] Diaphragm: When sound waves reach the microphone, the diaphragm vibrates following the sound waves.

[0052] Fiber optic sensor: The fiber optic sensor is connected to the vibrating diaphragm and captures vibration information by detecting changes in light signals in the optical fiber.

[0053] Light source and light detector: The light source emits a stable light signal, and the light detector receives the reflected or transmitted light signal.

[0054] When sound waves (air vibrations) from the environment reach the fiber optic microphone, the following process occurs:

[0055] Sound waves arrive: The sound waves cause the diaphragm in the microphone to vibrate.

[0056] Diaphragm vibration: The vibrating diaphragm is connected to the optical fiber sensor, and its vibration causes changes in the light intensity, phase or polarization state in the optical fiber.

[0057] Light signal changes: These changes are recorded by the light detector, forming a light signal corresponding to the sound signal.

[0058] In some embodiments, the process of converting the sound signal into the light signal is as follows:

[0059] Light source emits light: The light source emits a continuous light signal, which is transmitted through the optical fiber.

[0060] Interference or reflection changes in optical fiber: The movement of the vibrating diaphragm caused by sound fluctuations causes changes in the optical signal in the optical fiber, such as changes in light intensity, movement of interference fringes, phase shift, etc.

[0061] Photodetectors record changes: These light signal changes are captured by photodetectors and converted into electrical signals.

[0062] Electrical signal processing: After being processed, the electrical signal is converted back into an optical signal. This processing process may include steps such as amplification and filtering to obtain a first optical signal.

[0063] In some embodiments, the sound wave S(t) reaches the fiber microphone and the vibrating diaphragm starts to vibrate. The vibration M(t) of the vibrating diaphragm is transmitted to the fiber sensor. The optical signal I0 in the optical fiber changes due to the modulation of the vibrating diaphragm. Assume that the change of the optical signal can be expressed as I0=I0+△I(t), which is the change caused by the vibration. The optical detector captures the changed optical signal I(t) and converts it into an electrical signal E(t).

[0064] The electrical signal E(t) is converted into a corresponding optical signal after necessary processing (such as amplification, filtering, etc.). This process can be expressed in the following form:

[0065] P(t) = g(E(t));

[0066] g represents the processing process, and the first optical signal P(t) is obtained.

[0067] The process of collecting the sound signal of the current scene through the optical fiber microphone and converting the sound signal into the first optical signal utilizes the high sensitivity and anti-interference of optical fiber sensing technology. Sound fluctuations cause changes in the optical signal in the optical fiber, which are captured and processed by the optical detector, and finally the optical signal corresponding to the sound signal is obtained. This method has high anti-interference ability and signal confidentiality in complex environments.

[0068] The second conversion module 202 is used to convert the first optical signal into a first electrical signal through a photoelectric converter and process it, and transmit the processed first optical signal through an all-optical fiber network to obtain a second optical signal; quantum key distribution technology is used for encryption during the transmission process.

[0069] In some embodiments, the second conversion module 202 is further specifically configured to:

[0070] The second conversion module is further specifically configured to:

[0071] Acquire a conversion coefficient, a noise coefficient, and a system parameter for converting the first optical signal;

[0072] Performing integration processing on the first optical signal to determine an instantaneous rate of change of the first optical signal with respect to time;

[0073] The first optical signal is converted into a first electrical signal according to the instantaneous rate of change of the first optical signal with respect to time, the conversion coefficient, the noise coefficient and the system parameter.

[0074] In some embodiments, the first electrical signal is represented by:

[0075]

[0076] Wherein, V(t) is the output first electrical signal at time t, K is the conversion coefficient, N is the noise coefficient, P(t) represents the optical signal power at time t, τ is the time value, P(τ) is the optical signal intensity at time τ, and γ and λ are system parameters.

[0077] In a specific implementation, V(t) is the output first electrical signal at time t, which is the electrical signal output by the photoelectric converter and represents the voltage value converted from the optical signal;

[0078] K is the conversion coefficient, which is a proportional factor that determines the amplification or reduction ratio when the optical signal is converted into an electrical signal. The unit is usually volts per watt (V / W), which represents the response of optical power changes to voltage changes;

[0079] N is the noise factor, which represents the noise voltage in the system. Noise can come from the environment, the circuit itself, and other electronic devices. It is a constant or a small random signal that changes with time.

[0080] P(t) is the first optical signal, which represents the optical signal power at time t, and is the intensity of the optical signal collected by the optical fiber microphone and transmitted to the photoelectric converter;

[0081] τ is the time value, P(τ) is the optical signal intensity at time τ;

[0082] γ and λ are system parameters. γ is used to adjust the contribution of the integral term to the overall signal. The unit is the reciprocal of the second, which indicates the decay rate of the signal over time.

[0083] In the specific implementation, It is the instantaneous rate of change of the first optical signal P(t) with respect to time, reflecting the speed of change of the optical signal over time, corresponding to the fast-changing part of the optical signal.

[0084] is the historical contribution of the first light signal P(t). The integral accumulates the light signals P(τ) of all past times from τ = 0 to the current time t and decays by the exponential decay factor e -λ(t-τ) , and decays by an exponential factor e -λ(t-τ) The historical signal is attenuated. This term takes into account the time decay effect of the signal and reflects the slow-changing part and delay effect of the optical signal.

[0085] In the above manner, at time t, the electrical signal voltage V(t) of the present invention is determined by the instantaneous change and historical cumulative change of the optical signal P(t), multiplied by the conversion coefficient K, and added with the noise coefficient N. This conversion method enables the electrical signal to not only reflect the intensity of the current optical signal, but also include the dynamic change information of the optical signal over time, so that the original sound signal can be reproduced more accurately.

[0086] In some embodiments, the second conversion module 202 is further specifically configured to:

[0087] Obtain fiber loss coefficient, fiber length, signal frequency and phase offset of all-optical networks;

[0088] Determining, according to the optical fiber loss coefficient and the optical fiber length, an attenuation factor of the first optical signal propagating in the optical fiber of the all-optical network;

[0089] determining, according to the signal frequency and the phase offset, an oscillation behavior of the first optical signal during propagation in the all-optical network;

[0090] The second optical signal is obtained according to the first optical signal, the attenuation factor and the oscillation behavior.

[0091] In some embodiments, the second optical signal is represented by:

[0092] P out (t) = P in (t)×e -αL ×cos(ωt+φ);

[0093] Among them, P out (t) is the output second optical signal, P in (t) is the input optical signal, which is equivalent to the first optical signal P(t), α is the fiber loss coefficient, L is the fiber length, ω is the optical signal frequency, and φ is the phase shift.

[0094] In the specific implementation, P out (t) is the output second optical signal, is the output optical signal intensity after optical fiber transmission at time t, is the input optical signal P in (t) The result after optical fiber transmission;

[0095] P in (t) is the input optical signal, which is the intensity of the optical signal entering the optical fiber at time t, is equivalent to the first optical signal, is the optical signal obtained by the previous processing and conversion steps, and enters the optical fiber as the input signal for transmission;

[0096] α is the optical fiber loss coefficient, usually expressed in decibels per meter (dB / m), which indicates the attenuation of the optical signal when it propagates in a unit length of optical fiber. The larger the loss coefficient, the faster the optical signal attenuates.

[0097] L is the fiber length in meters (m), which indicates the total distance the optical signal propagates in the fiber. The longer the fiber, the greater the total attenuation of the optical signal.

[0098] ω is the frequency of the light signal, measured in radians per second (rad / s), which indicates the oscillation speed of the light signal and is proportional to the frequency of the light wave. The higher the frequency of the light signal, the faster the oscillation speed;

[0099] φ is the phase shift, measured in radians (rad), which represents the phase change caused by various factors (such as initial phase, propagation medium, etc.) during the propagation of the optical signal.

[0100] In the specific implementation, P out (t) = P in (t)×e -α·L ×cos(ωt+φ) comprehensively considers the attenuation and oscillation behavior of the optical signal in the optical fiber:

[0101] e -α·L It is the attenuation factor of the optical signal when it propagates in the optical fiber. It means that after the optical signal propagates through L meters of optical fiber, due to the effect of the loss coefficient α, the signal strength decays exponentially. The longer the optical fiber or the greater the loss coefficient, the smaller the attenuation factor and the weaker the output signal.

[0102] cos(ωt+φ) represents the oscillation behavior of the optical signal during propagation. The oscillation frequency of the optical signal is determined by the angular frequency ω, and the phase shift φ represents the phase change during signal propagation.

[0103] Input optical signal P in When (t) propagates in the optical fiber, it is affected by the optical fiber loss coefficient α and the optical fiber length L, and its intensity decays exponentially, forming an attenuation factor e -α·L The attenuated optical signal continues to oscillate at an angular frequency ω, with a phase shift of φ forming an oscillation factor cos(ωt+φ).

[0104] Output optical signal P out (t) is the input optical signal P in (t) The result after attenuation and oscillation reflects the propagation characteristics of the optical signal in the optical fiber.

[0105] Through the above methods, the present invention can be used to analyze the loss and phase change of optical signals in optical fiber transmission, help design and optimize optical fiber communication systems, and ensure the quality and stability of signals in long-distance transmission.

[0106] In some embodiments, quantum key distribution technology is used for encryption during transmission, and the key of the quantum key distribution technology is expressed as:

[0107] Ki =H(P i,j ⊕Q i,j )×e -μj ;

[0108] Among them, K i is the ith key, P i,j and Q i,j is a randomly generated quantum bit, H is a hash function, and ⊕ is the XOR operator.

[0109] In the specific implementation, K i is the i-th key used for encryption and decryption operations in the public broadcasting system;

[0110] P i,j and Q i,j is a randomly generated quantum bit, j represents the index of the bit pair used to generate the key. The quantum bit is the basic unit in quantum computing and can be in a superposition state of 0 and 1 at the same time;

[0111] H is a hash function, which is used to map input data to a fixed-length output. The hash function is one-way and collision-resistant, so that even if the input data changes slightly, the output result will be significantly different. In this formula, the hash function H is used to process the result of the XOR operation to generate a complex and unpredictable output;

[0112] ⊕ is the exclusive OR operator symbol;

[0113] μ is the weight decay coefficient, which is usually dimensionless and controls the weight of each bit pair in the generated key. The faster the decay rate, the smaller the impact of the later bit pairs on the key.

[0114] In the specific implementation, K i =H(P i,j ⊕Q i,j )×e -μj Used to generate the encryption key K i , ensuring the security and complexity of the key by performing XOR operations, hashing and weight decay on quantum bits.

[0115] P i,j ⊕Q i,j Through the XOR operation, two random quantum bits P i,j and Q i,j Combination, generate new bit values, XOR operation is random and unpredictable, making the generated bit value highly secure.

[0116] H(P i,j ⊕Q i,j) The XOR result is processed through a hash function H to map it to a fixed-length output. This step increases the complexity and security of the key, ensuring that even if the XOR result changes slightly, the final key will be significantly different.

[0117] Through the exponential decay function e -μj The weight of each bit pair is controlled. The attenuation coefficient μ ensures that the later bit pairs have less impact on the final key, making the key generation process more stable and controllable.

[0118] In practical applications, in quantum key distribution (QKD), the key generated by this formula can be used to encrypt and decrypt communication content to ensure the security of information transmission. i It can be used to encrypt and decrypt data to ensure the confidentiality and integrity of the data. In the public broadcasting system, the encryption method generated by quantum keys can effectively prevent information from being intercepted or tampered with, ensuring the security of communication content.

[0119] Through the above methods, the present invention provides a key generation method based on quantum bits and hash processing, which ensures the complexity and security of the key through XOR operation, hash processing and weight decay. In the public broadcasting system, this method can effectively improve the confidentiality and reliability of information transmission.

[0120] The first amplifying module 203 is configured to amplify the second optical signal using an optical amplifier to obtain an amplified third optical signal.

[0121] In some embodiments, the third optical signal may be represented as:

[0122]

[0123] Among them, P amp (t) is the amplified third optical signal, G is the optical amplifier gain, β is the modulation depth, Ω is the modulation frequency, P out (t) is the second optical signal.

[0124] In the specific implementation, P amp (t) is the third optical signal after amplification, is the intensity of the optical signal after amplification by the optical amplifier at time t, and is the enhanced signal ultimately used for broadcasting;

[0125] G is the gain of the optical amplifier, which indicates the amplifier's amplification factor for the input signal. It is a constant with dimensionless units. The greater the gain, the higher the degree of signal amplification.

[0126] β is the modulation depth, which indicates the degree of modulation of the signal during the amplification process. It is a constant, usually between 0 and 1, dimensionless. The greater the modulation depth, the more obvious the modulation effect of the signal.

[0127] Ω is the modulation frequency, which represents the angular frequency of the modulation signal in radians per second (rad / s), and is used to determine the oscillation speed of the modulation signal;

[0128] P out (t) is the output optical signal intensity obtained after transmission from the optical fiber, which serves as the input signal of the amplifier.

[0129] formula It reflects the gain and modulation effect of optical signals during amplification:

[0130] G represents the amplifier's response to the input optical signal P out The amplification factor of (t) directly determines the signal strength after amplification;

[0131] In the specific implementation, It is a factor for amplitude modulation of optical signals. The modulation depth β and modulation frequency Ω jointly determine the shape and change speed of the modulated signal.

[0132] Input optical signal P out (t) After amplification by the optical amplifier, the basic amplified signal obtained is G×P out (t), a modulated signal is superimposed on the basic amplified signal The output signal is modulated to a certain extent during the amplification process, and the modulation effect is determined by β and Ω.

[0133] The amplified and modulated optical signal P amp (t) is the original input signal P out (t) enhancement and modulation for higher quality broadcasting requirements.

[0134] In the above manner, the present invention can describe the amplification and modulation process of the optical signal in the amplifier, helping to improve the intensity and quality of the optical signal. By properly adjusting the gain G, modulation depth β and modulation frequency Ω, the amplified optical signal can be optimized to adapt to different broadcast environments and requirements.

[0135] In practical applications, optical signals become weak after long-distance transmission, and optical amplifiers are used to amplify the signal strength to ensure that the signal can be clearly received. In public broadcasting systems, additional information (such as synchronization signals) can be added by modulating the signal to improve the quality and reliability of the broadcast. According to different broadcast environments and requirements, the modulation depth and frequency are adjusted to achieve the best signal quality.

[0136] The signal filtering module 204 is configured to process the third optical signal through a filter, filter out the noise signal of the third optical signal, and obtain a fourth optical signal.

[0137] In some embodiments, the signal filtering module 204 is further specifically configured to: process the third optical signal through a filter transmission function of the filter.

[0138] In some embodiments, the filter transfer function is expressed as:

[0139]

[0140] Where H(f) is the filter transfer function, f is the frequency, and f c is the cutoff frequency and n is the filter order.

[0141] In the specific implementation, H(f) is the filter transfer function, which represents the transmission characteristics of the filter at frequency f and is a complex function. The transfer function determines the amplitude and phase response of the filter to the input signal at different frequencies;

[0142] f is the frequency, in Hertz (Hz), which represents the frequency component of the input signal;

[0143] f c is the cutoff frequency, measured in Hertz (Hz), which defines the frequency response of the filter, and is usually the frequency at which the signal's transmission amplitude drops to 0.707 times its maximum value;

[0144] n is the filter order, which indicates the polynomial degree of the filter transfer function and determines the filter response steepness and characteristics. The higher the order, the steeper the filter frequency response changes.

[0145] In the specific implementation, describes the frequency response of the filter, where j is the imaginary unit, i.e., j 2 =-1, this formula reflects the transmission characteristics of the filter for signals of different frequencies, as follows: When the frequency f is much smaller than the cut-off frequency f c When the frequency f is much larger than the cutoff frequency f, the transfer function H(f) is close to 1, indicating that the filter has almost no attenuation on the low-frequency signal and the low-frequency signal can pass through the filter. c When , the transfer function H(f) is close to It means that the filter has a great attenuation on the signal, and the high-frequency components are significantly weakened; when the frequency f is close to the cutoff frequency f c When , the value of the transfer function H(f) is between 0 and 1, indicating that the filter's attenuation of the signal begins to appear.

[0146] The transfer function represents a low-pass filter that allows low-frequency signals to pass through and attenuates high-frequency signals. The transfer function is a complex number that represents the effect of the filter on the phase of the signal. j introduces a 90-degree phase shift, which manifests as a phase change in the frequency response. The transfer function can be used to design and analyze low-pass filters, which can be used in public broadcasting systems to remove unwanted high-frequency noise and improve the quality and clarity of the signal.

[0147] In practical applications, in public broadcasting systems, low-pass filters can remove high-frequency noise and interference, retain useful low-frequency signals, and make broadcast content clearer. In audio signal processing, low-pass filters are used to smooth signals, remove high-frequency components, and improve sound quality. In data communications, low-pass filters are used to limit bandwidth, remove unnecessary high-frequency components, and ensure that signals are effectively transmitted within limited bandwidth.

[0148] Through the above method, the present invention adjusts the cut-off frequency f c and the filter order n, can control the frequency response characteristics of the signal. In the public broadcasting system, this filter can effectively remove high-frequency noise, enhance signal quality, and ensure the clarity and reliability of the broadcast content.

[0149] The second amplification module 205 is used to convert the fourth optical signal into a second electrical signal through a photoelectric converter, and transmit the second electrical signal to a power amplifier device for amplification.

[0150] In some embodiments, the second electrical signal may be represented as:

[0151]

[0152] Among them, V out (t) is the output second electrical signal, β and λ are attenuation coefficients, γ is the amplification coefficient, P amp (τ) is the fourth optical signal.

[0153] In the specific implementation, V out (t) is the output second electrical signal, which is the fourth optical signal P amp (τ) The processed result contains attenuation and amplification information;

[0154] β and λ are attenuation coefficients, usually expressed in units of 1 / s, which indicate how quickly the signal decays over time. The larger the attenuation coefficient, the faster the signal decays;

[0155] γ is the amplification factor, which is dimensionless. It represents the amplification factor of the differential part of the signal;

[0156] P amp (τ) is the fourth optical signal, is the intensity of the amplified optical signal at time τ, and is the optical signal after passing through the optical amplifier;

[0157] In the specific implementation, Indicates the fourth optical signal P amp The integral of (τ) takes into account the exponential decay of the signal in time. -β(t-τ) , so that the signal contribution closer to the current time t is greater, and the signal contribution farther away from the current time is smaller.

[0158] First, the input signal P amp (τ) performs a similar attenuation integral, except that the attenuation coefficient is different. The integral result is then differentiated and multiplied by the amplification coefficient γ. The differentiation operation emphasizes the rate of signal change and reflects the dynamic characteristics of the signal.

[0159] In practical applications, when converting optical signals into electrical signals during the photoelectric conversion process, a higher quality output signal can be obtained by considering the attenuation and rate of change of the signal. In signal processing systems, noise can be removed and useful signal features can be extracted by integrating and differentiating the input signal. In broadcasting systems, the dynamic characteristics of the signal can be enhanced by differential amplification of the signal, making the broadcast content clearer and more powerful.

[0160] Through the above methods, the present invention provides an effective system to convert optical signals into electrical signals, while taking into account the attenuation and dynamic characteristics of the signals, which can improve the quality and reliability of the output signals and has broad application prospects in public broadcasting systems.

[0161] The public broadcast module 206 is used to transmit the amplified second electrical signal to the speaker for broadcasting.

[0162] In some embodiments, the amplified second electrical signal is an electrical signal that has been processed and amplified, and has sufficient strength and quality to drive the speaker. The specific process is as follows:

[0163] Signal amplification: A weak electrical signal is amplified through a specific amplifier circuit to obtain an electrical signal with sufficient power.

[0164] Signal processing: During the amplification process, the electrical signal will also undergo other processing, such as filtering, equalization, etc. to ensure the quality and clarity of the signal.

[0165] The amplified second electrical signal needs to be transmitted to the speaker through a cable. The main purpose of cable transmission is to transmit the signal from the amplifier to the speaker location, ensuring that the signal is not distorted or attenuated during the transmission process. You can choose a suitable cable for signal transmission. Usually, low-impedance, high-conductivity cables such as copper wires are used to ensure signal integrity. You can plan a reasonable transmission path to minimize the cable length and intermediate nodes to reduce signal attenuation and interference.

[0166] In some embodiments, the speaker can convert the received electrical signal into sound waves, which are transmitted through the air to achieve sound broadcasting. The specific process is as follows:

[0167] Electrical signal input: The speaker receives the second electrical signal transmitted from the amplifier.

[0168] Conversion of electrical signals into sound waves: The coil in the speaker vibrates under the action of the electrical signal, driving the speaker diaphragm to move, thereby converting the electrical signal into sound waves.

[0169] Sound Propagation: Sound waves from a loudspeaker travel through the air, covering the broadcast area.

[0170] In some embodiments, the received second electrical signal V out (t) Amplified by an amplifier to obtain a signal V with sufficient strength amp (t), the amplification process can be expressed as:

[0171] V amp (t) = A × V out (t);

[0172] Where A is the gain factor of the amplifier.

[0173] In some embodiments, the amplified electrical signal V amp (t) is transmitted to the speaker through the cable. During the cable transmission process, the signal may be attenuated and interfered. The transmission process can be expressed as follows:

[0174] V trans (t) = V amp (t)-△V cable (t);

[0175] Among them, △V cable (t) represents the attenuation and interference caused by the cable during transmission.

[0176] V trans (t) = V amp (t)-△V cable (t);

[0177] In some embodiments, the speaker receives the transmitted electrical signal V trans (t), which can be converted into mechanical vibration and then into sound waves. This conversion process can be expressed as:

[0178] S(t)=u(V trans (t));

[0179] Where S(t) is the sound wave emitted by the speaker, u(Vtrans (t)) is the electro-acoustic transfer function of the loudspeaker.

[0180] In some embodiments, the process of transmitting the amplified second electrical signal to the speaker for broadcasting involves signal amplification, transmission and conversion. The specific steps include:

[0181] Signal amplification: The second electrical signal is amplified by an amplifier to ensure that the signal has sufficient strength.

[0182] Cable transmission: The amplified signal is transmitted to the speaker location through low-impedance, high-conductivity cables, ensuring the integrity of the signal during transmission.

[0183] Speaker conversion and broadcasting: Speakers receive electrical signals and convert them into sound waves, which propagate through the air to broadcast the sound.

[0184] In the above manner, the present invention collects and converts signals through an optical fiber microphone, combines the amplification and transmission of electrical signals, and finally broadcasts the sound through a loudspeaker, thereby ensuring the high quality and confidentiality of signal transmission.

[0185] See also Figure 3 , provides a flowchart of a public broadcasting method based on an all-optical network of the present invention, comprising the following steps:

[0186] Step 301: Collect a sound signal of the current scene through a fiber optic microphone, and convert the sound signal into a first light signal;

[0187] Step 302: convert the first optical signal into a first electrical signal through a photoelectric converter and process the first electrical signal, transmit the processed first optical signal through an all-optical network to obtain a second optical signal; and encrypt the second optical signal using quantum key distribution technology during the transmission process;

[0188] Step 303: Use an optical amplifier to amplify the second optical signal to obtain an amplified third optical signal;

[0189] Step 304: Process the third optical signal through a filter to filter out a noise signal of the third optical signal to obtain a fourth optical signal;

[0190] Step 305: convert the fourth optical signal into a second electrical signal through a photoelectric converter, and transmit the second electrical signal to a power amplifier device for amplification;

[0191] Step 306: Transmit the amplified second electrical signal to the speaker for broadcasting.

[0192] See also Figure 4 , Figure 4 Schematic diagram of an electronic device provided by an embodiment of the present invention. Figure 4 As shown, an embodiment of the present invention provides an electronic device 400, including a memory 410, a processor 420, and a computer program 411 stored in the memory 410 and executable on the processor 420. When the processor 420 executes the computer program 411, the following steps are implemented:

[0193] Collecting a sound signal of the current scene through a fiber optic microphone and converting the sound signal into a first light signal;

[0194] The first optical signal is converted into a first electrical signal by a photoelectric converter and processed, and the processed first optical signal is transmitted through an all-optical fiber network to obtain a second optical signal; and quantum key distribution technology is used to encrypt the first optical signal during the transmission process;

[0195] amplifying the second optical signal using an optical amplifier to obtain an amplified third optical signal;

[0196] Processing the third optical signal through a filter to filter out a noise signal of the third optical signal to obtain a fourth optical signal;

[0197] Converting the fourth optical signal into a second electrical signal through a photoelectric converter, and transmitting the second electrical signal to a power amplifier device for amplification;

[0198] The amplified second electrical signal is transmitted to the loudspeaker for broadcasting.

[0199] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0200] Those skilled in the art will appreciate that embodiments of the present invention may provide systems, methods, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects.

Claims

1. A public broadcasting system based on an all-optical network, characterized in that: The system comprises: A first conversion module, configured to collect a sound signal of a current scene through a fiber optic microphone and convert the sound signal into a first light signal; A second conversion module is used to convert the first optical signal into a first electrical signal through a photoelectric converter and process it, and transmit the processed first optical signal through an all-optical network to obtain a second optical signal; and encrypt the first optical signal using quantum key distribution technology during the transmission process; a first amplification module, configured to amplify the second optical signal using an optical amplifier to obtain an amplified third optical signal; a signal filtering module, configured to process the third optical signal through a filter, filter out a noise signal of the third optical signal, and obtain a fourth optical signal; A second amplification module, configured to convert the fourth optical signal into a second electrical signal through a photoelectric converter, and transmit the second electrical signal to a power amplifier device for amplification; The public broadcast module is used to transmit the amplified second electrical signal to the loudspeaker for broadcasting.

2. The public broadcasting system based on an all-optical network according to claim 1, characterized in that: The second conversion module is further specifically configured to: Acquire a conversion coefficient, a noise coefficient, and a system parameter for converting the first optical signal; Performing integration processing on the first optical signal to determine an instantaneous rate of change of the first optical signal with respect to time; The first optical signal is converted into a first electrical signal according to the instantaneous rate of change of the first optical signal with respect to time, the conversion coefficient, the noise coefficient and the system parameter.

3. The public broadcasting system based on an all-optical network according to claim 2, characterized in that: The second conversion module is further specifically configured to: Obtain fiber loss coefficient, fiber length, signal frequency and phase offset of all-optical networks; Determining, according to the optical fiber loss coefficient and the optical fiber length, an attenuation factor of the first optical signal propagating in the optical fiber of the all-optical network; determining, according to the signal frequency and the phase offset, an oscillation behavior of the first optical signal during propagation in the all-optical network; The second optical signal is obtained according to the first optical signal, the attenuation factor and the oscillation behavior.

4. The public broadcasting system based on an all-optical network according to claim 3, characterized in that: The signal filtering module is further specifically configured to: process the third optical signal through a filter transmission function of the filter.

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