An audio communication transmission circuit

Abstract

The utility model provides a kind of audio communication transmission circuit, can efficiently realize audio conditioning communication transmission, and through the switching of communication mode, different communication scenarios are adapted;It includes: half duplex signal unit module, between being connected to half duplex bus end PA, microphone, for the audio conditioning of audio signal input by microphone, simultaneously by half duplex bus end PA half duplex audio transceiver communication;Full duplex signal unit module, between being connected to full duplex bus end CC, microphone, for the audio conditioning of audio signal input by microphone, simultaneously by full duplex bus end CC full duplex audio transceiver communication;Switching module, with half duplex signal unit module, full duplex signal unit module, speaker are all connected, for selectable switching half duplex or full duplex audio signal to speaker;Master module, for output corresponding switch switching signal, and send to half duplex signal unit module, full duplex signal unit module, switching module.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted broadcast communication technology, specifically to an audio communication transmission circuit. Background Technology

[0002] The train's onboard broadcasting system is an important component of the train's passenger information system. During train operation, it provides functions such as station information broadcasting, station information display, manual broadcasting, manual intercom, and emergency intercom in case of emergencies. From the perspective of application scenarios, it plays a very important role.

[0003] Vehicle-mounted broadcasting systems require analog signals to be formatted into audio signals that meet relevant standards for transmission on the bus. Communication methods include half-duplex and full-duplex. Full-duplex communication allows simultaneous bidirectional data transmission between communicating parties, significantly improving communication efficiency and convenience in many situations. While half-duplex communication also supports bidirectional data transmission, it limits data transmission to one party at a time. Even so, in specific fields such as public safety and emergency response, half-duplex communication still possesses unique advantages. It exhibits better communication quality in harsh environments, utilizes spectrum resources more efficiently, and is simpler to operate in certain application scenarios. Therefore, both full-duplex and half-duplex communication methods are often indispensable in train-mounted broadcasting systems. However, due to the different communication interaction methods, the interoperability between the two is extremely poor, often resulting in information loss and communication quality degradation during audio formatting. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides an audio communication transmission circuit that can efficiently realize audio conditioning communication transmission and switch communication modes to adapt to different communication scenarios.

[0005] This utility model adopts the following technical solution: an audio communication transmission circuit, which includes a half-duplex bus terminal PA, a full-duplex bus terminal CC, a microphone, and a speaker, and further includes:

[0006] The half-duplex signal unit module is connected between the half-duplex bus terminal PA and the microphone. It is used to perform audio conditioning on the audio signal input from the microphone and to perform half-duplex audio transmission and reception communication through the half-duplex bus terminal PA.

[0007] The full-duplex signal unit module is connected between the full-duplex bus terminal CC and the microphone. It is used to perform audio conditioning on the audio signal input from the microphone and to perform full-duplex audio transmission and reception communication via the full-duplex bus terminal CC.

[0008] The switching module is connected to the half-duplex signal unit module, the full-duplex signal unit module, and the speaker, and is used to selectively switch the half-duplex audio communication signal or the full-duplex audio communication signal to the speaker.

[0009] The main control module is connected to the half-duplex signal unit module, the full-duplex signal unit module, and the switching module. It is used to output corresponding switch switching signals and send them to the half-duplex signal unit module, the full-duplex signal unit module, and the switching module.

[0010] Furthermore, the microphone's output is connected to an operational amplifier, the operational amplifier's output being connected to both the half-duplex signal unit module and the full-duplex signal unit module; a power amplifier is connected between the switching module and the speaker, and the power amplifier is connected to the main control module;

[0011] Furthermore, the half-duplex signal unit module includes an operational amplifier OPA1, a power amplifier AMP, a switch S1, a transformer T1, and a transformer T2. The switch S1 is a double-pole single-throw relay. The switch S1 is connected to the main control module. The output terminal of the operational amplifier is connected to the input terminal of the power amplifier AMP. The output terminal of the power amplifier AMP is connected to the half-duplex bus terminal PA after being connected to the transformer T1 and the switch S1 in sequence. The half-duplex bus terminal PA is connected to the switching module after being connected to the transformer T2 and the operational amplifier OPA1 in sequence.

[0012] Furthermore, the full-duplex signal unit module includes resistors R1 and R2, operational amplifiers OPA2~OPA10, switch S2, and transformer T3. Switch S2 is a double-pole single-throw relay, and is connected to the main control module. The output of the operational amplifier is connected to the input of operational amplifiers OPA2 and OPA8. The output of operational amplifier OPA2 is connected to one end of resistor R1, the input of operational amplifier OPA3, and the input of operational amplifier OPA4. The output of operational amplifier OPA3 is connected to one end of resistor R2. The other ends of resistors R1 and R2 are both connected to transformer T3. The transformer T3 is connected to the full-duplex bus terminal CC after being connected to the switch S2. The other end of the resistor R1 is connected to the input terminal of the operational amplifier OPA5. The output terminals of operational amplifiers OPA4 and OPA5 are both connected to the input terminal of operational amplifier OPA6. The output terminal of operational amplifier OPA6 is connected to the input terminals of operational amplifiers OPA7 and OPA10. The output terminals of operational amplifiers OPA7 and OPA8 are both connected to the input terminal of operational amplifier OPA9. The output terminal of operational amplifier OPA9 is connected to the input terminal of operational amplifier OPA10. The output terminal of operational amplifier OPA10 is connected to the switching module.

[0013] Furthermore, the switching module includes switch S3, which is a single-pole double-throw relay; the main control module includes an MCU microprocessor, which is connected to switches S1, S2, S3, and the power amplifier. The output terminal of operational amplifier OPA1 is connected to contact b of switch S3, the output terminal of operational amplifier OPA10 is connected to contact c of switch S3, and contact a of switch S3 is connected to the power amplifier.

[0014] The beneficial effects of this utility model are that, through the half-duplex signal unit module, full-duplex signal unit module, switching module, and main control module, it can not only efficiently realize audio conditioning communication transmission, but also selectively switch between half-duplex and full-duplex audio communication. By switching the communication mode to adapt to different communication scenarios, it can avoid the problems of information loss and communication quality degradation during audio conditioning, and has good application value. Attached Figure Description

[0015] Figure 1 This is a connection principle diagram of this utility model. Detailed Implementation

[0016] like Figure 1 As shown, this utility model discloses an audio communication transmission circuit, which includes a half-duplex bus terminal PA, a full-duplex bus terminal CC, a microphone 1, a speaker 2, and further includes:

[0017] The half-duplex signal unit module is connected between the half-duplex bus terminal PA and microphone 1. It is used to perform audio conditioning on the audio signal input from microphone 1, and at the same time to perform half-duplex audio transmission and reception communication via the half-duplex bus terminal PA.

[0018] The full-duplex signal unit module is connected between the full-duplex bus terminal CC and microphone 1. It is used to perform audio conditioning on the audio signal input from microphone 1, and at the same time to perform full-duplex audio transmission and reception communication via the full-duplex bus terminal CC.

[0019] The switching module is connected to the half-duplex signal unit module, the full-duplex signal unit module, and the speaker 2, and is used to selectively switch the half-duplex audio communication signal or the full-duplex audio communication signal to the speaker 2.

[0020] The main control module is connected to the half-duplex signal unit module, the full-duplex signal unit module, and the switching module. It is used to output corresponding switch switching signals and send them to the half-duplex signal unit module, the full-duplex signal unit module, and the switching module.

[0021] The output of microphone 1 is connected to operational amplifier 3, and the output of operational amplifier 3 is connected to both half-duplex signal unit module and full-duplex signal unit module; a power amplifier 4 is connected between the switching module and speaker 2, and the power amplifier 4 is connected to the main control module.

[0022] The half-duplex signal unit module includes operational amplifier OPA1, power amplifier AMP, switch S1, transformer T1, and transformer T2. Switch S1 is a double-pole single-throw relay. Switch S1 is connected to the main control module. The output of operational amplifier 3 is connected to the input of power amplifier AMP. The output of power amplifier AMP is connected to the half-duplex bus PA after passing through transformer T1 and switch S1 in sequence. The half-duplex bus PA is connected to the switching module after passing through transformer T2 and operational amplifier OPA1 in sequence.

[0023] The full-duplex signal unit module includes resistors R1 and R2, operational amplifiers OPA2~OPA10, switch S2, and transformer T3. Switch S2 is a double-pole single-throw relay and is connected to the main control module. The output of operational amplifier 3 is connected to the inputs of operational amplifiers OPA2 and OPA8. The output of operational amplifier OPA2 is connected to one end of resistor R1, the input of operational amplifier OPA3, and the input of operational amplifier OPA4. The output of operational amplifier OPA3 is connected to one end of resistor R2. The other ends of resistors R1 and R2 are both connected to transformer T3. Transformer T3 is connected to the full-duplex bus terminal CC via connection switch S2. The other end of resistor R1 is connected to the input terminal of operational amplifier OPA5. The output terminals of operational amplifiers OPA4 and OPA5 are both connected to the input terminal of operational amplifier OPA6. The output terminal of operational amplifier OPA6 is connected to the input terminals of operational amplifiers OPA7 and OPA10. The output terminals of operational amplifiers OPA7 and OPA8 are both connected to the input terminal of operational amplifier OPA9. The output terminal of operational amplifier OPA9 is connected to the input terminal of operational amplifier OPA10. The output terminal of operational amplifier OPA10 is connected to the switching module.

[0024] The switching module includes switch S3, which uses a single-pole double-throw relay; the main control module includes an MCU microprocessor, which is connected to switches S1, S2, S3, and power amplifier 4. The output of operational amplifier OPA1 is connected to contact b of switch S3, the output of operational amplifier OPA10 is connected to contact c of switch S3, and contact a of switch S3 is connected to power amplifier 4.

[0025] The working principle of this utility model is as follows: The communication of the vehicle broadcasting system requires the analog signal to be conditioned into an audio signal that meets the UIC568 ​​standard (the standard technical characteristics of broadcasting and telephone systems in RJC railway passenger cars) for transmission on the bus; in half-duplex mode, the MCU microprocessor outputs the corresponding switch switching signal and sends it to switches S1, S2, and S3. The power amplifier AMP conditions the audio signal input from microphone 1 to a signal that meets the requirements, and then sends it to the corresponding device or equipment through transformer T1, switch S1, and half-duplex bus terminal PA; at the same time, the operational amplifier OPA1 conditions the received audio signal on the half-duplex bus terminal PA to a suitable value, and then plays it out through speaker 2 after passing through switch S3 and power amplifier 4;

[0026] In full-duplex mode, the MCU microprocessor outputs the corresponding switch switching signal and sends it to switches S1, S2, and S3. Through operational amplifiers OPA2 and OPA3, the audio signal input from microphone 1 is conditioned to meet the requirements. Then, through resistors R1 and R2, transformer T3, and switch S2, it is sent to the corresponding device or equipment via the full-duplex bus terminal CC. Since the full-duplex bus terminal CC is in full-duplex mode, the audio signal on the full-duplex bus terminal CC is received by operational amplifiers OPA4 to OPA10. At the same time, the audio signal transmitted by microphone 1 is eliminated by operational amplifier 3. Then, the audio signal on the full-duplex bus terminal CC is played out through speaker 2 after passing through switch S3 and power amplifier 4.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An audio communication transmission circuit, comprising a half-duplex bus terminal PA, a full-duplex bus terminal CC, a microphone, and a speaker, characterized in that: It also includes: The half-duplex signal unit module is connected between the half-duplex bus terminal PA and the microphone. It is used to perform audio conditioning on the audio signal input from the microphone and to perform half-duplex audio transmission and reception communication through the half-duplex bus terminal PA. The full-duplex signal unit module is connected between the full-duplex bus terminal CC and the microphone. It is used to perform audio conditioning on the audio signal input from the microphone and to perform full-duplex audio transmission and reception communication via the full-duplex bus terminal CC. The switching module is connected to the half-duplex signal unit module, the full-duplex signal unit module, and the speaker, and is used to selectively switch the half-duplex audio communication signal or the full-duplex audio communication signal to the speaker. The main control module is connected to the half-duplex signal unit module, the full-duplex signal unit module, and the switching module. It is used to output corresponding switch switching signals and send them to the half-duplex signal unit module, the full-duplex signal unit module, and the switching module.

2. The audio communication transmission circuit according to claim 1, characterized in that: The microphone's output is connected to an operational amplifier, and the operational amplifier's output is connected to both the half-duplex signal unit module and the full-duplex signal unit module; a power amplifier is connected between the switching module and the speaker, and the power amplifier is connected to the main control module.

3. The audio communication transmission circuit according to claim 2, characterized in that: The half-duplex signal unit module includes an operational amplifier OPA1, a power amplifier AMP, a switch S1, a transformer T1, and a transformer T2. The switch S1 is a double-pole single-throw relay. The switch S1 is connected to the main control module. The output terminal of the operational amplifier is connected to the input terminal of the power amplifier AMP. The output terminal of the power amplifier AMP is connected to the half-duplex bus terminal PA after being connected to the transformer T1 and the switch S1 in sequence. The half-duplex bus terminal PA is connected to the switching module after being connected to the transformer T2 and the operational amplifier OPA1 in sequence.

4. The audio communication transmission circuit according to claim 3, characterized in that: The full-duplex signal unit module includes resistors R1 and R2, operational amplifiers OPA2~OPA10, switch S2, and transformer T3. Switch S2 is a double-pole single-throw relay and is connected to the main control module. The output of the operational amplifier is connected to the input of operational amplifiers OPA2 and OPA8. The output of operational amplifier OPA2 is connected to one end of resistor R1, the input of operational amplifier OPA3, and the input of operational amplifier OPA4. The output of operational amplifier OPA3 is connected to one end of resistor R2. The other ends of resistors R1 and R2 are connected to transformer T3. Device T3 is connected to the full-duplex bus terminal CC after being connected to the switch S2. The other end of the resistor R1 is connected to the input terminal of the operational amplifier OPA5. The output terminals of operational amplifiers OPA4 and OPA5 are both connected to the input terminal of operational amplifier OPA6. The output terminal of operational amplifier OPA6 is connected to the input terminals of operational amplifiers OPA7 and OPA10. The output terminals of operational amplifiers OPA7 and OPA8 are both connected to the input terminal of operational amplifier OPA9. The output terminal of operational amplifier OPA9 is connected to the input terminal of operational amplifier OPA10. The output terminal of operational amplifier OPA10 is connected to the switching module.

5. The audio communication transmission circuit according to claim 4, characterized in that: The switching module includes switch S3, which is a single-pole double-throw relay; the main control module includes an MCU microprocessor, which is connected to switches S1, S2, S3, and the power amplifier. The output terminal of operational amplifier OPA1 is connected to contact b of switch S3, the output terminal of operational amplifier OPA10 is connected to contact c of switch S3, and contact a of switch S3 is connected to the power amplifier.

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