CN211908809U - Multi-channel audio transmission circuit system adopting optical fibers - Google Patents

Abstract

The utility model belongs to the technical field of broadcast communication, in particular to a multi-channel audio transmission circuit system adopting optical fibers, which comprises a signal acquisition circuit, an A/D conversion chip, a CPLD data processing chip, an LVDS coding chip, a light emitting module, a light receiving module, an LVDS decoding chip, a digital power amplifier and a terminal sound box, wherein, a plurality of signal acquisition circuits are all connected with the CPLD data processing chip through the A/D conversion chip, the CPLD data processing chip is respectively connected with the LVDS coding chip and the LVDS decoding chip, the LVDS coding chip is connected with the light emitting module, the light emitting module is respectively connected with the light receiving module and the LVDS decoding chip, the light receiving module is respectively connected with the LVDS decoding chip and the LVDS coding chip, the LVDS decoding chip and the LVDS coding chip are both connected with the CPLD data processing chip, the CPLD data processing chip is connected with the, the digital power amplifier is connected with the terminal sound box; the control function of the system and the state monitoring function of the light receiving module can be realized.

Description

Multi-channel audio transmission circuit system adopting optical fibers

Technical Field

The utility model relates to a broadcast communication technical field, more specifically relates to an adopt multichannel audio transmission circuit system of optic fibre.

Background

Optical fiber communication is a communication mode in which optical fibers are used as transmission media, optical signals are converted into electric signals, and the optical signals are used as information carriers. Due to the advantages of unique broadband, large communication capacity, low time delay, interference resistance and small attenuation, the high-fidelity and real-time data transmission can be realized, and the method is one of the best modes in all communication at present. The traditional audio transmission through the network cable is realized by utilizing an Ethernet interface through a local area network, so that the bandwidth is limited, the real-time performance is low, and the method is not suitable for occasions requiring high fidelity and high real-time performance.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned drawback that exists among the prior art, the utility model aims at providing an adopt multichannel audio transmission circuit system of optic fibre, can realize the control function of system and the state monitoring function to optical receiving module.

The utility model discloses an aim at and solve its technical problem and adopt following technical scheme to realize:

a multi-channel audio transmission circuit system adopting optical fibers comprises a plurality of signal acquisition circuits, an A/D conversion chip, a first CPLD data processing chip, a first MCU controller, a first LVDS coding chip, a light emitting module, a first LVDS decoding chip, a light receiving module, a second LVDS decoding chip, a second LVDS coding chip, a second CPLD data processing chip, a second MCU controller, a digital power amplifier and a terminal loudspeaker box, wherein the signal acquisition circuits are connected with the first CPLD data processing chip through the A/D conversion chip, the first CPLD data processing chip is respectively connected with the first LVDS coding chip, the first LVDS decoding chip and the first MCU controller, the first LVDS coding chip is connected with the light emitting module, the light emitting module is respectively connected with the light receiving module and the first LVDS decoding chip, the light receiving module is respectively connected with the second LVDS decoding chip and the second LVDS coding chip, the second LVDS decoding chip and the second LVDS coding chip are both connected with the second CPLD data processing chip, the second CPLD data processing chip is respectively connected with the digital power amplifier and the second MCU controller, and the digital power amplifier is connected with the terminal loudspeaker box.

Preferably, the light emitting module is connected with the light receiving module through a single mode fiber.

Preferably, a plurality of the signal acquisition circuits and the A/D conversion chip form an A/D circuit.

Preferably, the number of the light receiving modules is 4, and the 4 light receiving modules are all connected with the light emitting module.

Preferably, the first LVDS encoding chip and the second LVDS encoding chip are both SN65LV1023A in model, and the first LVDS decoding chip and the second LVDS decoding chip are both SN65LV1224B in model.

Preferably, the model of the first MCU controller is STM8S105K4T6C, and the model of the second MCU controller isSTC8F2K32S 2.

Preferably, the models of the first CPLD data processing chip and the second CPLD data processing chip are bothEPM240T100C 5.

Preferably, the digital power amplifier is a stereo digital audio power amplifier with the model number of TAS 5707.

Preferably, the model of the A/D conversion chip is CS 5343-CZZ.

Preferably, the multi-channel audio transmission circuit system further comprises a power module, and the power module supplies power to the multi-channel audio transmission circuit system.

The utility model discloses adopt multichannel audio transmission circuit system of optic fibre has following advantage: the optical fiber transmission of multi-channel high-definition audio data is realized by adopting a time division multiplexing mode, meanwhile, the functions of transmitting control signals and receiving state signals are added, the continuous audio transmission is ensured, meanwhile, the sending and receiving loops of the control signals and the state signals are added, and the control function of the system and the function of monitoring the state of a receiving terminal are realized.

Drawings

Fig. 1 is a schematic structural diagram of a multi-channel audio transmission circuit system using optical fibers according to an embodiment of the present invention;

fig. 2 is a schematic view of a connection structure between a light emitting module and a light receiving module according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a power module according to an embodiment of the present invention;

fig. 4 is a circuit diagram of an MCU controller provided in the embodiment of the present invention;

fig. 5 is a circuit diagram of a CPLD data processing chip provided by an embodiment of the present invention;

fig. 6 is a circuit diagram of an a/D conversion chip according to an embodiment of the present invention;

fig. 7 is a circuit diagram of an LVDS encoding chip, an LVDS decoding chip, a light emitting module and a light receiving module provided in an embodiment of the present invention;

fig. 8 is a circuit diagram of a digital power amplifier according to an embodiment of the present invention.

Detailed Description

To further illustrate the technical means and effects of the present invention for achieving the objects of the present invention, the following detailed description will be given, with reference to the accompanying drawings and preferred embodiments, to the specific embodiments, structures, features and effects of the multi-channel audio transmission circuit system using optical fibers according to the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

As shown in FIG. 1, a multi-channel audio transmission circuit system using optical fibers includes a plurality of signal acquisition circuits, an A/D conversion chip, a first CPLD data processing chip, a first MCU controller, a first LVDS coding chip, a light emitting module, a first LVDS decoding chip, a light receiving module, a second LVDS decoding chip, a second LVDS coding chip, a second CPLD data processing chip, a second MCU controller, a digital power amplifier and a terminal speaker, wherein the plurality of signal acquisition circuits are connected with the first CPLD data processing chip through the A/D conversion chip, the first CPLD data processing chip is connected with the first LVDS coding chip, the first LVDS decoding chip and the first MCU controller, the first LVDS coding chip is connected with the light emitting module, and the light emitting module is connected with the light receiving module, the first LVDS decoding chip, the second LVDS data processing chip, the second LVDS decoding chip, the first MCU controller, the digital power amplifier and the terminal speaker The first LVDS decoding chip is connected, the light receiving module is respectively connected with the second LVDS decoding chip and the second LVDS coding chip, the second LVDS decoding chip and the second LVDS coding chip are both connected with the second CPLD data processing chip, the second CPLD data processing chip is respectively connected with the digital power amplifier and the second MCU controller, and the digital power amplifier is connected with the terminal loudspeaker box.

After being collected by a signal collecting circuit, a plurality of channels of audio signals are converted into digital signals through an A/D conversion chip and then are processed by a first CPLD data processing chip, the first CPLD data processing chip outputs parallel signals to a first LVDS coding chip, the first LVDS coding chip converts the parallel signals into serial signals and outputs the serial signals to a light emitting module, the light emitting module transmits the serial signals to a light receiving module through optical fibers, the light receiving module receives the serial signals and transmits the serial signals to a second LVDS decoding chip, the second LVDS decoding chip converts the serial signals into the parallel signals and transmits the parallel signals to a second CPLD data processing chip, the I2S signals are transmitted to a digital power amplifier after being processed by the second CPLD data processing chip, and finally the digital power amplifier outputs amplified analog audio signals to a terminal sound box; in addition, the second CPLD data processing chip transmits the received parallel signals to the second LVDS coding chip, the second LVDS coding chip converts the parallel signals into serial signals and outputs the serial signals to the light receiving module, the light receiving module transmits the serial signals to the light emitting module through optical fibers, the light emitting module receives the serial signals and transmits the serial signals to the first LVDS decoding chip, and the first LVDS decoding chip converts the serial signals into parallel signals and transmits the parallel signals to the first CPLD data processing chip, so that bidirectional signal transmission can be realized.

In this embodiment, the optical transmitting module is connected to the optical receiving module through a single mode optical fiber.

As shown in fig. 2, the number of the light receiving modules is 4, and the 4 light receiving modules are all connected with the light emitting module.

As shown in fig. 3, the power module supplies power to the whole system, and the LM2596S-12/TR chip is specifically adopted to convert into 12V in this embodiment, so that the power module can be used for expanding functions, and secondly supplies power to the power amplification circuit, the maximum output current is 3A, then the 12V is reduced to 5V through the BUCK circuit, and finally the 5V is converted into 3.3V by using the LDO to supply other modules in the circuit, and the power supply of the optical transmitting module and the optical receiving module is 3.3V/5V, and can be directly used by using the 3.3V converted by the LDO.

As shown in fig. 4, the model of the first MCU controller is STM8S105K4T6C, and the model of the second MCU controller isSTC8F2K32S 2; in order to save cost, the second MCU controller can adopt a singlechip with low STC, the first MCU controller sends a control signal to the first CPLD data processing chip and transmits the control signal to the light receiving module through an optical fiber, a data packet of the light receiving module comprises a plurality of paths of audio signals and control signals, the control signals are transmitted to the second CPLD data processing chip after being converted by the second LVDS decoding chip, the second MCU controller analyzes the control signals, selects one path of audio to be connected to the terminal sound box, and simultaneously transmits a local state signal back to the light emitting module; the figure specifically illustrates the first MCU controller, and the circuit of the receiving end is not different from that of the transmitting end.

As shown in fig. 5, the models of the first CPLD data processing chip and the second CPLD data processing chip are both EPM240T100C5, and a 75MHZ chip active crystal oscillator provides a clock for the whole system, and the JTAG interface is used for downloading programs from a regular upper computer.

As shown in fig. 6, a plurality of signal acquisition circuits and a/D conversion chips form an a/D circuit, the model of the a/D conversion chip is CS5343-CZZ, a high-quality a/D circuit is used to complete multi-channel audio acquisition, the sampling frequency is 48KHZ, the conversion precision is 24bit (CD tone quality is 44.1KHZ, 16bit), the conversion process can achieve high fidelity, and a master-slave mode can be realized by pulling up and pulling down the SDOUT pin of the a/D conversion chip.

As shown in fig. 7, the first LVDS encoding chip and the second LVDS encoding chip are both SN65LV1023A in model, and the first LVDS decoding chip and the second LVDS decoding chip are both SN65LV1224B in model; the audio signal is transmitted to a first CPLD data processing chip, 8B data is mapped into 10B data, the 10B data is parallelly input to a first LVDS coding chip for parallel-serial conversion, a 75MHZ clock is subjected to three-frequency division and input to TCLK, an output differential signal is matched with a 100 ohm matching resistor, passes through a coupling capacitor, a resistor voltage division connection TXN and a TXP pin of a light emitting module, is transmitted to an RXP and an RXN pin of a light receiving module through optical fibers, returns to a second LVDS decoding chip through the resistor voltage division for serial-parallel conversion, and finally returns to a second CPLD data processing chip for processing.

As shown in fig. 8, the digital power amplifier is a stereo digital audio power amplifier, and the model is TAS 5707; a small ceramic capacitor is arranged between an output pin OUT X and a bootstrap pin BST _ X of the power amplifier, the small ceramic capacitor is connected with a 20W loudspeaker through an LC circuit, a receiving end optical fiber transmits data to a second CPLD data processing chip, the second CPLD data processing chip transmits an audio format to a digital power amplifier through an I2S communication protocol after processing, a control signal of the digital power amplifier adopts an I2C signal, the internal real situation of the digital power amplifier is a D-type power amplifier, the digital power amplifier works by adopting a PWM carrier wave, the switching rate is 352KHZ-384KHZ, the sampling rate is specifically determined, the power supply power adopts 12V direct current of an amplifying part, and the IC working part adopts 3.3V direct current.

The utility model discloses adopt multichannel audio transmission circuit system of optic fibre has following advantage, when adopting time division multiplex mode to realize the optic fibre transmission of multichannel high definition audio data, has increased control signal transmission and state signal receiving function, when guaranteeing audio frequency continuous transmission, has increased control signal and state signal's sending and receiving return circuit, has realized the control function of system and to receiving terminal's state monitoring function.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.

Claims (10)

1. A multi-channel audio transmission circuit system adopting optical fibers is characterized by comprising a plurality of signal acquisition circuits, an A/D conversion chip, a first CPLD data processing chip, a first MCU controller, a first LVDS coding chip, a light emitting module, a first LVDS decoding chip, a light receiving module, a second LVDS decoding chip, a second LVDS coding chip, a second CPLD data processing chip, a second MCU controller, a digital power amplifier and a terminal sound box, wherein the signal acquisition circuits are connected with the first CPLD data processing chip through the A/D conversion chip, the first CPLD data processing chip is respectively connected with the first LVDS coding chip, the first LVDS decoding chip and the first MCU controller, the first LVDS coding chip is connected with the light emitting module, and the light emitting module is respectively connected with the light receiving module, the first LVDS decoding chip is connected, the light receiving module is respectively connected with the second LVDS decoding chip and the second LVDS coding chip, the second LVDS decoding chip and the second LVDS coding chip are both connected with the second CPLD data processing chip, the second CPLD data processing chip is respectively connected with the digital power amplifier and the second MCU controller, and the digital power amplifier is connected with the terminal loudspeaker box.

2. The multi-channel audio transmission circuit system using optical fiber according to claim 1, wherein the optical transmitter module is connected to the optical receiver module via a single-mode optical fiber.

3. The multi-channel audio transmission circuit system using optical fibers according to claim 1, wherein a plurality of the signal acquisition circuits and the a/D conversion chip constitute an a/D circuit.

4. The multi-channel audio transmission circuit system using optical fibers according to claim 1, wherein the number of the light receiving modules is 4, and the 4 light receiving modules are all connected to the light emitting module.

5. The multi-channel audio transmission circuit system using optical fiber according to claim 1, wherein the first LVDS encoding chip and the second LVDS encoding chip are both model numbers SN65LV1023A, and the first LVDS decoding chip and the second LVDS decoding chip are both model numbers SN65LV 1224B.

6. The multi-channel audio transmission circuit system using optical fibers according to claim 1, wherein the first MCU controller has a model number STM8S105K4T6C, and the second MCU controller has a model number STC8F2K32S 2.

7. The multi-channel audio transmission circuit system using optical fiber according to claim 1, wherein the first CPLD data processing chip and the second CPLD data processing chip are both of EPM240T100C5 type.

8. The multi-channel audio transmission circuit system using optical fiber according to claim 1, wherein the digital power amplifier is a stereo digital audio power amplifier, model number TAS 5707.

9. The multi-channel audio transmission circuit system using optical fibers according to claim 1, wherein the a/D conversion chip has a model of CS 5343-CZZ.

10. The multi-channel audio transmission circuit system using optical fibers according to claim 1, further comprising a power module, wherein the power module supplies power to the multi-channel audio transmission circuit system.

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