CN215345071U

CN215345071U - Optimized multi-channel sound source optical fiber broadcasting paging circuit system

Info

Publication number: CN215345071U
Application number: CN202120860452.2U
Authority: CN
Inventors: 万波
Original assignee: Nanjing Jing Da Micro Electronics Technology Co ltd
Current assignee: Nanjing Jing Da Micro Electronics Technology Co ltd
Priority date: 2021-04-25
Filing date: 2021-04-25
Publication date: 2021-12-28
Anticipated expiration: 2031-04-25

Abstract

The utility model discloses an optimized multi-channel sound source optical fiber broadcasting paging circuit system, which comprises an audio processor WM S and is characterized in that the system receives two paths of audio input signals, outputs analog audio signals to an audio power amplifier under the control of an ARM processor, and outputs I2S format digital audio signals to a CPLD processing chip, and further comprises an audio signal input circuit, an audio signal output circuit and an audio power amplifier module, wherein the audio signal input circuit comprises a microphone audio input circuit and an external audio input circuit which are respectively connected with an audio input port of the WM S audio processor, and the audio power amplifier module is connected with an audio output end of the WM S. The output of the audio power amplification module is connected with a loudspeaker. The optimized multi-channel sound source optical fiber broadcasting paging circuit system adopts a time division multiplexing mode to increase the sending and returning functions of signals while transmitting audio under the control of a CPLD hardware processor, thereby realizing the control function and the monitoring function of the system to a terminal.

Description

Optimized multi-channel sound source optical fiber broadcasting paging circuit system

Technical Field

The utility model relates to a system for transmitting multiple audio signals through an optical fiber. The method is used in the communication field such as broadcasting.

Background

Broadcast paging circuitry is one type of circuitry used in remote broadcast pagers. The remote broadcast pager can realize the transmission of multi-channel sound source input through a network cable or an optical fiber, is used as public broadcasting equipment in the broadcasting field, and is widely applied to the public broadcasting fields of campuses, scenic spots, station airports, subways and the like. The sound source of the broadcast paging circuit system generally consists of a microphone input part and an external sound source input part, and is processed and transmitted by a processor after being respectively converted and controlled by an audio AD conversion chip, an audio power amplification chip, a sound volume control chip and the like. The circuit system is composed of a plurality of analog chips, the circuit is complex, circuit noise is easy to introduce, and the requirements on circuit design and system debugging are high. The system uses the circuit structure of ARM + CPLD + WM8978 on the basis of the current broadcast paging circuit system, controls WM8978 through the ARM processor, makes full use of the multipath audio processing function of WM8978, further optimizes and improves the system circuit, simplifies the circuit, shortens the circuit debugging time and reduces the cost. Meanwhile, an optical fiber transmission mode is adopted, and compared with the traditional network transmission, the optical fiber transmission method has the advantages of large bandwidth, low time delay and difficulty in interference. The method is suitable for occasions with high fidelity, real-time performance and high reliability requirements.

SUMMERY OF THE UTILITY MODEL

The technical scheme adopted by the utility model for realizing the aim is that the optimized multi-channel sound source optical fiber broadcasting paging circuit system comprises an audio signal input circuit, an ARM processor, a WM8978 audio processor, a CPLD processing chip, an audio power amplifier, an LVDS coding chip, an LVDS decoding chip, an optical fiber transceiving module, a multi-stage power circuit, a touch screen and peripheral circuits thereof. The power supply adopts 24V input, changes to 12V, changes to 5V, and when changes to 3.3V, adopts LDO linear voltage regulator.

More, the audio signal input circuit comprises a microphone audio input circuit and an external audio input circuit which are respectively connected to an audio input interface of a WM C audio processor, the ARM processor is connected with the WM C processor through an I2C interface, an analog audio output interface of the WM C is connected to an audio power amplifier and outputs the audio power amplifier to a local loudspeaker, a digital audio output interface of the WM C is connected with a CPLD processing chip, the CPLD processing chip is connected with an LVDS coding/decoding chip, and the CPLD processing chip is connected with the ARM processor. The LVDS optical fiber encoding/decoding chip is connected with the single-mode optical fiber transceiving module, is responsible for transmitting audio and control signals and receiving remote feedback signals, and the touch screen is connected with the ARM processor.

Preferably, the specific model of the ARM processor of the multi-channel sound source optical fiber broadcasting paging circuit system is STM32F429, the specific model of the data processing chip is CPLD, the specific model of the EPM240T100C5, the specific model of the audio processor chip is WM8978CGEFL, and the LVDS coding and decoding chips are SN65LV1023A and SN65LV1224B respectively. The external audio digital-to-analog conversion circuit, the analog-to-digital conversion circuit and the volume control circuit are saved, the circuit complexity is simplified, and the system debugging difficulty is reduced. Meanwhile, under the control of a CPLD hardware processor, a time division multiplexing mode is adopted to increase the sending and returning functions of signals while audio transmission, thereby realizing the control function and the monitoring function of the system to the terminal.

Drawings

In order to illustrate the design of the utility model more clearly, reference will now be made to the appended drawings, which are referred to in the examples.

FIG. 1 is a block diagram of an optimized multi-tone source fiber optic broadcast paging circuitry.

Fig. 2 is a power supply circuit diagram of the present invention.

Fig. 3 shows a circuit diagram of a two-way audio input circuit and a WM8978 audio chip processing circuit adopted in the present invention.

FIG. 4 is a circuit diagram of an ARM processor interface according to the present invention.

Fig. 5 is a circuit diagram of a CPLD hardware processor in the present invention.

Fig. 6 is a circuit diagram of an LVDS encoding and decoding module, and an optical fiber transceiving module.

Fig. 7 is a block diagram of a conventional fiber broadcast paging circuitry.

Detailed Description

Referring to fig. 1, an optimized multi-channel audio source optical fiber broadcasting paging circuit system includes a 1 microphone audio input circuit, a 2 external audio input circuit, a 3WM8978 audio processor, a 4ARM processor chip, a 5CPLD processing chip, a 6LVDS coding module, a 7LVDS decoding module, an 8 optical fiber transceiver module, a 9 audio power amplifier, a 10 speaker, and a 11 touch screen.

The 1 microphone audio input circuit and the 2 external audio input circuits are respectively connected to two paths of analog audio input ports of a 3WM8978 audio processor; the 4ARM processor is connected to the 3WM 2C audio processor through an I2C bus, and the ARM is transmitted to the 3WM C audio processor through an I2C bus according to the working mode selected by a user and converted into a control instruction; under the control of ARM, the 3WM S converts the input audio into I2S digital audio signals and sends the signals to the 5CPLD processing chip; the 4ARM processor is connected with the 5CPLD processing chip and transmits a control signal; the 5CPLD processing chip rearranges and packages the audio I2S signal output by the 3WM S and the control signal from the 4ARM processor and sends the signals to the 6LVDS coding module; the 6LVDS coding module converts the received parallel data into a serial differential signal and transmits the serial differential signal to the 8 optical fiber transceiving modules; and 8, the optical fiber transceiving module transmits the signal to a remote server through an optical fiber, and the transmission medium is a single-mode optical fiber. The 8 optical fiber receiving and transmitting module receives the optical fiber signal transmitted by the remote server, then carries out photoelectric conversion, converts the optical fiber signal into a serial differential signal and transmits the serial differential signal to the 7LVDS decoding chip, and the 7LVDS decoding chip converts the serial differential signal into a parallel signal and then transmits the parallel signal to the 5CPLD processing chip. 5, the CPLD processing chip reconstructs and analyzes the data, and the analyzed data is sent to the 4ARM processor; the specific model of the 4ARM processor chip is STM32F429, the model of the 5CPLD processor chip is EPM240T100C5, the model of the 3WM8978 audio processor is WM8978CGEFL, the model of the 6LVDS coding chip is SN65LV1023A, and the model of the 7LVDS decoding chip is SN65LV 1224B.

Under the control of a 4ARM processor, 3WM8978 converts input audio into local analog audio and sends the local analog audio to a 9-audio power amplifier; the 9 audio power amplifier outputs an audio signal to the 10 speakers. The specific 9 audio power amplifier is a TC8002D 3W audio power amplifier. The 11 touch screen is connected with the 4ARM processor and used for interacting and displaying with a user.

In the circuit diagram of the embodiment shown in fig. 2, the input of the power module is 24V dc power. In the circuit shown in fig. 2, because high-power loads such as an ARM processor circuit and a CPLD processing chip need to be supported, and the power supply chip has strong current output capability, the LM2596S-12/TR DC-DC chip is specifically adopted in the embodiment, and the output current of the LM2596S-12/TR DC-DC chip can reach 3A at most. Then the 12V voltage is reduced to 5V through an FR9886 DC-DC chip, and finally the 5V voltage is converted into 3.3V voltage by adopting an LM1117 LDO chip to be used by a corresponding module in a circuit.

Claims

1. An optimized multi-channel audio source optical fiber broadcasting paging circuit system comprises an audio processor WM S and is characterized in that a two-channel audio input signal is received, an analog audio signal is output to an audio power amplifier under the control of an ARM processor, and an I2S format digital audio signal is output to a CPLD processing chip.

2. The optimized multi-tone optical fiber broadcasting paging circuit system of claim 1, wherein: the microphone audio input circuit comprises a microphone audio input circuit and an external audio input circuit which are respectively connected with an audio input port of the WM8978 audio processor.

3. The optimized multi-tone optical fiber broadcasting paging circuit system of claim 1, wherein: the audio power amplifier is connected with the audio output end of the WM8978, and the output of the audio power amplifier is connected with a loudspeaker.

4. The optimized multi-tone optical fiber broadcasting paging circuit system of claim 1, wherein: the CPLD processing chip is connected with the audio processor WM8978, receives a digital audio signal stream sent by the audio processor WM8978, converts the digital audio signal stream into a serial signal and sends the serial signal to the LVDS coding module, receives and analyzes data of the LVDS decoding module, is connected with the ARM processor, can receive an instruction of the ARM processor and send the instruction through the LVDS coding module, and can analyze and transmit the data of the LVDS decoding module to the ARM processor.

5. The optimized multi-tone optical fiber broadcasting paging circuit system of claim 1, wherein: the system also comprises an ARM processor and a peripheral circuit thereof, and the ARM processor is responsible for interacting with users and analyzing user input information to control the playing and sending of the two-way audio signals.

6. The optimized multi-tone optical fiber broadcasting paging circuit system of claim 1, wherein: the system also comprises an LVDS coding module which is connected with the CPLD processing chip and the optical fiber transceiving module and converts the parallel data of the CPLD into LVDS serial format to be sent out.

7. The optimized multi-tone optical fiber broadcasting paging circuit system of claim 1, wherein: the LVDS decoding module is connected with the CPLD processing chip and the optical fiber transceiving module, receives serial data of the optical fiber transceiving module, converts the serial data into a parallel format and sends the parallel format to the CPLD processing chip.

8. The optimized multi-tone optical fiber broadcasting paging circuit system of claim 1, wherein: the optical fiber transceiver module is responsible for transmitting and receiving optical fiber signals.

9. The optimized multi-tone optical fiber broadcasting paging circuit system of claim 1, wherein: the power supply adopts 24V input, converts 12V into 5V, and adopts an LDO linear voltage regulator when the voltage is converted into 3.3V.

10. The optimized multi-tone optical fiber broadcasting paging circuit system of claim 1, wherein: the system also comprises a touch screen and a peripheral circuit thereof, which are used for the interaction between the system and a user and the information display.