Frequency modulation frequency band digital audio broadcast monitoring device
By designing a digital audio broadcast monitoring device for the FM band, the problems of complex monitoring and lack of intelligent detection in existing technologies have been solved. This enables rapid switching monitoring and automatic alarm for FM and CDR digital audio broadcasts, improving the reliability and security of the broadcast transmission system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-09
- Publication Date
- 2026-03-27
AI Technical Summary
Existing radios require manual adjustment when switching between FM and CDR digital audio broadcast modes, making it impossible to achieve one-click quick switching. They also lack automatic alarm and intelligent detection functions, resulting in untimely monitoring response, increasing manual workload and reducing the reliability and security of the broadcast transmission system.
A frequency modulation (FM) band digital audio broadcast monitoring device was designed, comprising an antenna, an FM tuning decoding module, a CDR digital audio decoding module, an audio switching module, an FPGA processing unit, a microcontroller, an audio power amplifier, a speaker, a buzzer, an LED button module, a remote communication module, and a serial control interface. It enables simultaneous monitoring of FM and CDR digital audio broadcasts and features automatic alarm, remote communication, and human-machine interaction functions.
It enables rapid switching and monitoring between FM and CDR digital audio broadcasting, and features automatic alarm and remote communication functions, improving monitoring efficiency and system intelligence, reducing manual operation, and enhancing the reliability and security of the broadcasting transmission system.
Smart Images
Figure CN224054266U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of broadcast television, specifically relates to a frequency modulation frequency band digital audio broadcast monitoring device. BACKGROUND
[0002] At present, in the frequency modulation broadcast signal transmitting system, FM frequency band gradually adopts the form of analog and digital audio broadcast coexistence (digital analog simulcast), that is, one transmitting frequency band transmits both traditional analog FM broadcast and multiple sets of CDR digital audio broadcast. Under this broadcast signal transmitting environment, the operator of the transmitting station usually uses an ordinary radio to listen to the program content.
[0003] However, the existing radio can usually only select a single mode for listening, and if it is necessary to switch between FM and CDR digital audio broadcast modes for listening, it is necessary to manually adjust and select the channel, and one-key quick switching listening cannot be realized, which easily leads to untimely listening response. In addition, the existing device lacks automatic alarm and intelligent detection functions, and when the audio signal is interrupted, muted or abnormally disturbed, it cannot timely alert the operator, has a monitoring leakage risk, increases the artificial burden, and reduces the reliability and safety of the broadcast transmitting system. UTILITY MODEL CONTENT
[0004] In view of the above problems, the utility model provides a frequency modulation frequency band digital audio broadcast monitoring device, which has the functions of simultaneous listening of FM and multiple sets of CDR digital audio broadcast, automatic alarm, remote communication and man-machine interaction, and solves the problems of complex listening means and lack of intelligent detection in the prior art.
[0005] The utility model adopts the following technical scheme:
[0006] The utility model provides a frequency modulation frequency band digital audio broadcast monitoring device, which comprises an antenna, an FM tuning decoding module, a CDR digital audio decoding module, an audio switching module, an FPGA processing unit, a single-chip microcomputer, an audio power amplifier, a loudspeaker, a buzzer, an LED key module, a remote communication module and a serial control interface.
[0007] Preferably, the antenna is connected with the FM tuning decoding module and the CDR digital audio decoding module respectively.
[0008] Preferably, the FM tuning decoding module and the CDR digital audio decoding module are connected with the audio switching module and the FPGA processing unit respectively.
[0009] Preferably, the output end of the audio switching module is connected with the audio power amplifier, and the output end of the audio power amplifier is connected with the loudspeaker.
[0010] Preferably, the FPGA processing unit is connected with the audio switching module, the single-chip microcomputer, the serial control interface and the remote communication module respectively.
[0011] Preferably, the single-chip microcomputer is connected with the buzzer and the LED key module respectively.
[0012] Preferably, the FM tuning and decoding module is used for decoding the FM signal in the frequency range of 87-108MHz into an analog audio signal and an I2S signal, which are output to the audio switching module and the FPGA processing unit respectively.
[0013] Preferably, the CDR digital audio decoding module comprises a multi-channel digital audio decoding chip, which is used for receiving and decoding the CDR signal, outputting an analog audio signal and an I2S signal, and being connected to the audio switching module and the FPGA processing unit respectively.
[0014] Preferably, the audio switching module selects an analog audio signal to be output to the audio power amplifier under the control of the FPGA processing unit, so as to drive the loudspeaker to play audio.
[0015] Preferably, the FPGA processing unit is used for analyzing the received I2S signal in real time, uploading the detected fault information to the remote communication module, and communicating with external equipment through the serial control interface.
[0016] Preferably, the single-chip microcomputer controls the buzzer to emit an alarm sound and controls the LED indicator of the LED key module to display the current channel state according to the control signal sent by the FPGA processing unit.
[0017] Preferably, the LED key module comprises a plurality of channel switching keys and corresponding LED indicators, the keys are used for selecting a listening channel, and the LED indicator flashes to alarm when the signal of the selected channel is abnormal, and the LED indicator is always on in a normal state.
[0018] The scheme of the utility model at least has following beneficial effects:
[0019] Fast monitoring and channel switching: the device supports receiving FM analog broadcast signals and CDR digital audio broadcast signals simultaneously, and realizes fast switching and monitoring of the specified channel audio signal through one-key switching of the LED key module, thereby improving the monitoring efficiency.
[0020] Audio fault detection and alarm prompt: the FPGA processing unit monitors the I2S audio signal in real time, the single-chip microcomputer controls the buzzer to emit an alarm sound when detecting audio loss, silence or abnormal signal, and the LED indicator of the LED key module flashes to remind, thereby realizing the sound and light alarm linkage.
[0021] Status indication and channel monitoring: The LED key module visually indicates the status of each listening channel. The indicator light is always on in normal state, and flashes when audio failure or interruption occurs, making it easy for the operator to intuitively grasp the status of each channel signal.
[0022] Remote monitoring and data uploading: Real-time uploading of fault information to the remote monitoring platform through the LoRa communication module realizes remote audio monitoring and fault warning in unattended mode, and improves the intelligent and networked level of the monitoring system.
[0023] Modular design and convenient deployment: The equipment adopts modular structure design, and each functional module is connected through standardized interface, which simplifies wiring and facilitates installation and maintenance, reduces engineering construction difficulty, and improves system integration efficiency.
[0024] Extensibility and upgrade capability: The equipment reserves serial data interface and module expansion space, provides hardware support for subsequent addition of AI fault identification module, network data acquisition module and other functions, and has good system upgrade and expansion capability. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 is a structural schematic diagram of the utility model.
[0026] Figure 2 is an FM tuning decoding module circuit diagram of the utility model.
[0027] Figure 3 is a CDR digital audio decoding module circuit diagram of the utility model.
[0028] Figure 4 is an audio switching module circuit diagram of the utility model.
[0029] Figure 5 is a FPGA processing unit circuit diagram of the utility model.
[0030] Figure 6 is a single-chip microcomputer circuit diagram of the utility model. DETAILED DESCRIPTION
[0031] To make the purpose, technical scheme and effect of the utility model more clear and definite, the utility model is further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.
[0032] Please refer to Figure 1The utility model provides a kind of frequency modulation frequency band digital audio broadcast monitoring device, including antenna, FM tuning decoding module, CDR digital audio decoding module, audio switching module, FPGA processing unit, single-chip microcomputer, audio power amplifier, loudspeaker, buzzer, LED button module, remote communication module and serial control interface, which are provided in the embodiment.The antenna receives FM analog broadcast signals and CDR digital audio broadcast signals within the range of 87-108MHz, and sends them into FM tuning decoding module and CDR digital audio decoding module for decoding processing respectively.FM tuning decoding module and CDR digital audio decoding module output analog audio signals and I2S signals respectively, wherein the analog audio signals are sent into audio switching module, and the selected audio signals are amplified by audio power amplifier module and then drive loudspeaker to output;I2S signals are sent into FPGA processing unit for real-time audio signal analysis and fault detection.
[0033] When audio signals are abnormal (such as mute or signal loss), FPGA processing unit outputs control signals to single-chip microcomputer, which controls buzzer to emit alarm sound and controls corresponding channel indicator light in LED button module to flicker for prompt; the keys in LED button module are used to switch monitoring signals, and corresponding indicator light is always on after the selected channel; fault alarm information can also be uploaded to cloud platform through remote communication module to realize remote monitoring.
[0034] Please refer to Figure 2 FM tuning decoding module in the embodiment is based on SI4703 chip, which is used to receive and decode FM broadcast signals within the frequency range of 87-108MHz.FM radio frequency signals are input into SI4703 chip through radio frequency input network L1, and analog audio signals and I2S digital audio data are generated after internal demodulation.Analog audio signals are transmitted to audio switching module after being processed by filter network composed of R1, R2 resistor and C1, C2 capacitor.
[0035] Meanwhile, I2S digital audio data are output to FPGA processing unit through FPGA_SCLK, FPGA_SDIO, FPGA_SD and FPGA_SW interfaces to realize real-time analysis and fault detection of audio signals.SI4703 chip provides clock reference for data transmission through crystal oscillator network composed of C3, C4 and 33kHz to ensure the synchronization of data transmission.
[0036] The embodiment realizes demodulation and synchronous output of FM analog audio and I2S digital audio through SI4703 chip, which not only realizes double-channel output of FM decoded signals, but also provides data source for subsequent audio data analysis and abnormal detection.
[0037] Please refer to Figure 3The CDR digital audio decoding module in the embodiment is constructed based on a Hi5216 digital audio decoding chip, and its peripheral circuit includes an input matching network, an LC filter, a power decoupling network, an audio output network, and an FPGA communication interface circuit. The module is used for receiving and decoding a CDR digital broadcast signal, and outputting an analog audio signal and I2S digital audio data.
[0038] The high-frequency signal is input into the Hi5216 chip via a matching network composed of C1 and L4, and is inhibited by an LC filter composed of L5, L6 and C15 to suppress high-frequency noise and ensure signal integrity. The power input end of the Hi5216 chip is connected to multiple decoupling capacitors including C16 to C24, which are used for power noise filtering to ensure stable system operation.
[0039] In the audio output part, the analog audio signal decoded by the Hi5216 chip is output through the LOUT and ROUT pins, and after being subjected to limiting processing by the decoupling capacitors C7 and C8 and the magnetic bead filter network L7 and L8, it is transmitted to the audio switching module; the I2S audio data is sent into the FPGA processing unit through the communication interface FPGA_DOUT, FPGA_SCLK, FPGA_DFS and FPGA_DCLK, and the real-time analysis and fault detection of the audio data are realized by the FPGA. A 12MHz crystal oscillator provides a clock reference signal for the Hi5216 to ensure the timing stability of the I2S data transmission.
[0040] Please refer to the accompanying Figure 4 The embodiment provides an audio switching module for selecting between multiple audio signal sources and outputting the selected signal to a loudspeaker after power amplification for listening.
[0041] The audio switching module includes two-stage audio signal selection circuit and a set of audio power amplification output circuit. The audio input end is provided with four left channel signal input ends L1_IN to L4_IN and corresponding four right channel signal input ends R1_IN to R4_IN for receiving analog audio signals output from the CDR digital audio decoding module and the FM tuning decoding module.
[0042] The left and right channel input signals are respectively input into a first analog switch chip TS3A44159, which is a four-to-two analog multiplexer device, and its control end is connected with the FPGA to control the on-off of the switch through a control signal, thereby realizing the selection of any two analog audio signals and outputting from the chip output ends COM1 to COM4.
[0043] Subsequently, the output signal of TS3A44159 is further input to a second analog switch chip TS5A23157, which is a dual-channel two-option analog switch device, and is switched and controlled by the control signal provided by the FPGA, for selecting the two analog signals output by the previous stage again, so as to realize multi-stage combination switching logic and enhance the flexibility and controllability of the audio channel.
[0044] Finally, the selected audio signal is input to an audio power amplifier chip PAM8403 after passing through the filtering and direct current isolation network composed of resistors R1 and R2 and capacitors C1 and C2, the chip is a class-D dual-channel power amplifier, and has the characteristics of high efficiency and low power consumption, and the output ends thereof are connected to loudspeakers SPK2 and SPK1 respectively for driving sound.
[0045] Through the above structure design, the audio switching module can realize flexible selection and output of multiple audio signal sources, has the characteristics of simple circuit structure, flexible control mode and high integration, and is suitable for audio channel management and listening application scenarios in a multi-source input environment.
[0046] Please refer to Figure 5 The embodiment provides an FPGA processing unit circuit, wherein the core controller adopts an FPGA chip with a model of EP4CE6E22. The control module is used for coordinating data interaction and control logic between a CDR digital audio decoding module, an FM tuning decoding module, an audio switching module, a single-chip microcomputer, a remote communication module and a serial control interface.
[0047] In the audio data processing part, the FPGA chip is connected with the CDR digital audio decoding module through ports FPGA_DOUT, FPGA_SCLK, FPGA_DFS and FPGA_DCLK, and is connected with the FM tuning decoding module through ports FPGA_SCLK, FPGA_SDIO, FPGA_SD and FPGA_WS, so as to construct an I2S digital audio data interface and facilitate unified processing of digital audio data from different sound sources. The FPGA chip is also connected with the audio switching module through control ports FPGA_S1 to FPGA_S4, so as to realize selection and switching of multiple analog audio signal paths.
[0048] In the system alarm control part, the FPGA chip is connected with an external single-chip microcomputer (STM32) through STM32_C1 to STM32_C5, so as to send a control instruction to the single-chip microcomputer after fault detection.
[0049] In the remote communication part, the FPGA chip is connected with the LoRa communication module RA-01 to establish an SPI communication link. The ANT pin of the RA-01 module is connected to an external antenna L1 and is powered by a 3.3V power supply, supporting the uploading of remote audio state monitoring and alarm data.
[0050] In the serial communication part, the FPGA chip is connected with the serial port level conversion chip SP3232 to realize data exchange with external serial port equipment. The SP3232 chip is externally configured with five 100nF capacitors C1 to C5 for internal stable power supply operation, ensuring the stability and reliability of serial communication.
[0051] In summary, the FPGA processing unit realizes the centralized collection of audio data, signal control, remote communication and local alarm linkage control through unified management and data scheduling of each functional module, thereby constituting the core control and operation platform of the system.
[0052] Referring to Figure 6 The single-chip microcomputer module in the embodiment is built based on an STM32 single-chip microcomputer and is used for monitoring channel switching control, state indication and fault alarm.
[0053] The LED key module includes four self-resetting LED keys (KEY1 to KEY4) and is used for monitoring signal switching control. The key signal is input to the STM32 single-chip microcomputer through an IO port. After the key is pressed, the STM32 single-chip microcomputer switches the corresponding monitoring channel and lights up the corresponding LED indicator light (LED1 to LED4) to display the current monitoring channel state. When the monitoring signal is abnormal or interrupted, the STM32 controls the corresponding LED light to flash, thereby realizing the fault prompt function.
[0054] The buzzer (BEEP) is driven by a triode S8050, and its control port is connected to the STM32 single-chip microcomputer. When an abnormal audio signal is detected, the STM32 single-chip microcomputer outputs a control signal to the buzzer to issue a sound alarm and remind the operator to handle it in time.
[0055] The STM32 single-chip microcomputer is connected with the FPGA processing unit through the STM32_C1 to C5 ports to establish a communication connection, is used for receiving the control signal and fault detection information output by the FPGA, and thereby realizes the cooperative control of the modules in the system.
[0056] The embodiments of the utility model have been described in detail in combination with the drawings, however, these embodiments are only used for explaining the principles and technical schemes of the utility model, and are not limited to the protection scope of the utility model. For those skilled in the art, various equivalent replacements, deformations and improvements can be made without deviating from the principles and spirits of the utility model, and these should be regarded as belonging to the protection scope of the utility model.
Claims
1. A frequency modulated band digital audio broadcast monitoring device, characterized by, The device comprises an antenna, an FM tuning decoding module, a CDR digital audio decoding module, an audio switching module, an FPGA processing unit, a single-chip microcomputer, an audio power amplifier, a loudspeaker, a buzzer, an LED key module, a remote communication module, and a serial control interface. The antenna is connected to the FM tuning decoding module and the CDR digital audio decoding module respectively. The FM tuning decoding module and the CDR digital audio decoding module are connected to the audio switching module and the FPGA processing unit respectively. The output end of the audio switching module is connected to the audio power amplifier, and the output end of the audio power amplifier is connected to the loudspeaker. The FPGA processing unit is connected to the audio switching module, the single-chip microcomputer, the serial control interface, and the remote communication module respectively. The single-chip microcomputer is connected to the buzzer and the LED key module respectively.
2. The device according to claim 1, wherein the FM tuning decoding module is configured to decode the FM signals in the frequency range of 87-108 MHz into analog audio signals and I2S signals, and output the signals to the audio switching module and the FPGA processing unit respectively.
3. The device according to claim 1, wherein the audio switching module is configured to select one of the analog audio signals and output the selected signal to the audio power amplifier for driving the loudspeaker to play audio under the control of the FPGA processing unit.
4. The device according to claim 1, wherein the FPGA processing unit is configured to analyze the received I2S signals in real time, upload the detected fault information to the remote communication module, and communicate with external devices through the serial control interface.
5. The device according to claim 1, wherein the single-chip microcomputer is configured to control the buzzer to emit an alarm sound and control the LED indicator of the LED key module to display the current channel status according to the control signal sent by the FPGA processing unit.
6. The device according to claim 1, wherein the LED key module comprises a plurality of channel switching keys and corresponding LED indicators, the keys are configured to select the listening channel, and the LED indicators are configured to flash to alarm when the signal of the selected channel is abnormal and to keep on when the signal is normal.