1moduleIntroduction

SV-2701VPandSV-2703VPSIP network intercom broadcast audio core moduleIt is a universal independentSIPAudio function module, can be easily embedded intoOEMIn the product. This module applies to data from the networkSIPagreement andrtpEncode and decode audio streams.

This module supports multiple network protocols and audio encoding and decoding protocols, and can be used forVoIPandIPPaging and high-quality music streaming applications. Meanwhile,SV-2703VPAlso provides two serial ports and eight digital inputs/Output, allowing users to control through the program.

For hardware product development and integration, our company provides usage development specifications, including schematics, pin distribution, and custom carrier boardsPCBSuggestions for layout.

SV-2701VPandSV-2101VPandSV-2401VPCompatible, not supportedGPIOAnd serial port.

SV-2703VPandSV-2103VPandSV-2403VPCompatible and supportedGPIOAnd serial port.

This series of modules canApplied in the following fields:

• Various commercial network audio streaming applications

• Network alarm, network player

• Universal bidirectional full duplex for paging and internal communication applicationsVoIP intercom

• forSource Encoder for IP Audio Distribution Applications

• forBackground music and music preservation encoder for VoIP applications

• Suitable for various low latency applicationsIP audio encoder

• Unmanned parking lot, self-service charging station intercom terminal

• Highway tunnel intercom and toll station intercom terminals

SIPThe network audio module can be compatible with the standardSIPOther components in the systemSIPUsed in conjunction with the terminal. In addition to supporting standardssipProtocol, this series of modules also has our proprietary protocol, so it can be used with our standard broadcast software. Implementation includes additional features such as real-time paging, scheduled broadcasting, background music, and emergency broadcasting. Meanwhile,weAlso provides configuration software to configure modulesIPAddress and other parameters.

2、 Module structure

SV-2701VP/SV-2703VPSIP network intercom broadcast audio core moduleusedAT32F437VGT7Processor architectureAdd professional two-way audioCodeccodec， The processor is responsible for data transmission, parsing and executing user commands, and controlling the amplifier interface,Professional AudioCodecresponsible forAudio input and output. Through the internetinterface，SV-2701VP/SV-2703VPCan be directly connected to Ethernet. itsinternalThe structure is as follows：

3、 Function and Features

lAudio working mode:

audioDecode：That is, audio playback. Receive audio streams from the network, decode them through modulesOutput through linehigh qualityaudioSignal. currentlySupports playing the following audio formats:MP3TheWAV (PCM +IMA ADPCM)TheG.711TheG.722Wait, can play the highest48ksampling rate320kpsThe audio stream.

Receiving in the networkTCPTheUDPTheRTP、multicast、The audio stream sent through broadcasting or other means is decoded locally and played.

audioencoding： supportG.711a/uTheG.722andRTPmulticastpattern.

lControl method:

Button control:Directly through the moduleIOMouth, control moduleSIPIntercom or sendFriseRTPmulticast

Serial port control:Control the module through the control serial port on the moduleSIPIntercom or initiateRTPmulticast

Network control:Control the control module through network commands on other devices on the networkSIPIntercom or initiateRTPmulticast

lSystem status output:

Audio input and output status: can be connected to indicator lights or control relays.

Server connection indication

lExtended features (not all models support the following features):

POEPower supply:providePOEPower receiving module interface

SDCard: You can transfer audio files to through the networkSDIn the card, timed or controlled playback through network and serial port

GeneralIO： Control extended circuits or devices

Universal serial port: Control extended circuits or devices

Real time clock: Module power outage, or providing accurate time without server synchronization, obtained through serial port or network, or timed playback of audio files

4、 Technical parameters

lPower input: voltageDC4.7～5.5V

maximumWorking current,200mA

lTemperature: Temperature range for use 0～70℃(Industrial grade:-40～85℃）

Storage temperature range -40～85℃

lNetwork interface: 10/100M BaseAdaptive Ethernet interface

lMic/LineInInputTypical amplitude1000mVrms, signal-to-noise ratio95dB

lLine Outoutput:load10KΩ, typical1000Vrms，signal-to-noise ratio95dB(In playback mode)

lDecodepattern： Provide stereo soundplay，Maximum and highest48kHz，320kbpsAudio stream, supports MP3TheWAV (PCM +IMA ADPCM)TheG.711 a/uTheG.722Waiting format.

The minimum delay is50ms

lencodingpattern： supportG.711a/uTheG.722andRTPpattern

The minimum delay is30ms

lbidirectionalpattern： bidirectionalIntercom with high-performance echo suppression algorithm,8kHzSampling,G.711a/uTheG.722encoding

The minimum delay is80ms

lControl serial interface: Baud rate115.2kbps

lGPIO： together4roadGeneralIO，among which2Road input2Road output（SV-2701VPNot supported)

lUniversal serial port： Support transparent transmission, baud rate2400～115.2kbps，7，8Data bits,1，2Stop position,None，Even，Odd，Space，Markverify（SV-2701VPNot supported)

lModule size： longX Width xHigh:5.2×4×1.5cm

5Pin Description

SV-2701VP/SV-2703VPSeries network audio module, all external connections adopt pin form, pin spacing2.0mm.

Port type definition

P ———— power supply

AI ———— Analog input (here is audio input)

AO ———— Analog output (here is audio output)

I ———— Digital input port,TTLVoltage level, withstand voltage5V

O ———— Digital output port,TTLlevel

I/O ———— Digital input/output ports,TTLlevel

N ———— network port

Because many of the hardware interfaces mentioned later are directly connected to the processor. In most casesThe digital input and output terminals are connected to the external environment and require an external driver circuit to protect the processor from damage. Analog input/Analog output also requires the addition of amplification circuits and input protection circuits.

pin definition

6、 Hardware interface description

1. Power input port

This network audio module adopts DC power supply, wide voltage input, and power supply rangeDC4.7～5.5V.The input power supply voltage must be as stable as possible, with a minimum current guarantee100mA.

2. Control serial portport（Uart0）

This network audio module has a control serial port, which can be used to query the working information and parameters of the network audio module, as well as control the operation of the network audio module. It can even communicate with any device on the networkUsually, we use this port to create a keyboard or display interface.Our company also provides monitor and keyboard kits, can be used as a matching device for on-demand terminals and paging microphones.

For details, please refer to[Serial port of network audio module]

3. Line OutLine output port

Line output is the audio output interface of the module during playback or intercom.

If what is being played isMP3Waiting for stereo signal will provide stereo output；ifDetected that the audio source from the network is monauralADPCM/PCMWaiting for other mono channelsIn audio format, the left and right channels output the same signal.

P-STAs an audio output indicator, it can control the enable end of the digital amplifier to ensure that there is no noise from the speaker when there is no sound output, while saving energy consumption.P-STIt can also serve as a control terminal for a relay, controlling the power supply of the subsequent power amplifier circuit.

P-STThe change in signal is determined by whether there is an audio stream in the network, regardless of the assignment of the output audio signalP-STmore than1Seconds will not return to low level until they receive an audio signal. Sometimes, we hope toP-STChange to high level without sound output, and play audio streams without sound.

4. Line Inline/Micinput port

Line In/MicThe input is the audio input interface of the module during recording or intercom, which can provide1Route input or directly connect to a condenser microphone.Micinput180 mVpp(Maximum), Line InAudio line input3.3 Vpp(Maximum), the gain can be adjusted.

MicYou can directly connect a capacitive microphone,Line InCan be used for differential input or single ended input

Line InandMicThere are three working modes:①Miceffective/Line InInvalid;②Micinvalid/Line InEffective;③Miceffective/Line InEffective; can be passed throughSIPManagerOr choose its working mode through serial port or network.

5. intercom/Broadcast controlport

For simple application scenarios, only a few button switches need to be connected to achieve two-way intercom or broadcasting. To this end,SV-2703VPSpecially designed with a control terminal, defined as follows.

The low level of the call port is valid and can be directly connected to a switch or button, or an additional one can be added10/100kPull up resistor (optional), cannot be directly connected to power supply (including3.3V）.

There are two working modes for the input port: pulse mode, which means press once to call and then press again to disconnect. 【 Hold mode 】, it needs to be continuously pressed to take effect, release it to open the port. The calling end can control the module for intercom or broadcast (unicast, multicast, or broadcast).

can be passed throughSIPManagerConfigure various parameters corresponding to the calling end.

6. GeneralIOUniversal serial port（GPIO Uart1）

GeneralIOAnd it has nothing to do with the audio work of the universal serial port and network moduleJust the network audio module connects the network and serial portsGPIOConnect the ports togetherIt is usually used to control external devices, such as using this port to control another power controller or connect to an infrared detector on site. The universal serial port provides a transparent transmission method, which can be used to connect a serial device of the audio module accessory. Users can control these ports from anywhere on the network through their own software.

About GeneralIOAnd universal serial port, participateSIPManagerAnd the Network Control Document.

7. network interface

The network interface adopts two connection methods:

1)adoptRJ45standard10/100MAdaptive network interface.RJ45There are two indicators on the seat, one is a connection indicator light, and the other is a data transmission and reception indicator light.

2)Using the tail line method, most cameras can directly use the tail line. In this way, the network audio module can be placed inside the device.

Using the network tail line, you can choose9Core or11Core tail wire, if neededPOEThe power receiving module must be used11Core tail wire. among which7Core (or9Connect the core to this terminal, and the other two cores are connected to the power terminal.

among which1、2、3、6Can be exchanged with each other, as long as it ensures1、2or3、6Pairing is sufficient.8、9They can also be exchanged with each other.

sevenProduct selection

1. SV-2701VP/SV-2703VPList of Series Module Models

SV-2700VPThe series module adopts a pin structure, and the models and corresponding functions are as follows:

2. List of other compatible module models

SV-2101VP/SV-2103VPSeries modules have a wide range of functions, but not every application requires all interfaces. The models and corresponding functions are as follows:

SV-2400VPSeries modules andSV-2100VPThe series modules are similar, adopting a socket structure and adding2×15WThe digital amplifier, model and corresponding functions are as follows:

eighty percent、Application scenarios

Whether used for audio broadcasting, two-way intercom, or environmental sound collection，SV-2701VP/SV-2703VPThe network audio module can be used with very few peripherals. For example, it can be integrated into active speakers asIPNetwork speakers, integrated into traditional constant voltage amplifiers as network constant voltage amplifiers; It can also be integrated into industrial robots to add functions such as playback and intercom.

1. Play application

Network audio devices can accept audio streams from the network, decode them, and convert them into analog audio signals for output. The following figure shows a standard playback application scenario.

SV-2701VP/SV-2703VPThe network audio module can be used as a playback terminal by simply adding a power supply and an external amplifier. It can be used as a standalone device or integrated into other audio devices such as amplifiers or active speakers, making it a network audio playback terminal.

The playback host can use our company's broadcasting system control software, broadcasting equipment, network microphones, etc., or the user can choose according to our company's requirementsDLLDevelop your own broadcasting software using dynamic libraries. The playback software or development package both use our company's proprietary protocol and only support playback of our device modules. The network audio module serves as a playback terminal and uses our proprietary protocol for playback control, which can only be used on the local area network orVPNInternal network usage. In fact, customers can also choose to develop it themselvesSIPThe protocol playback software can be used in the LAN or the Internet.

2. Intercom application

Network audio devices can be used in both directionsSIPIn the intercom system.

SV-2703VPThe network audio module can be used as an intercom broadcasting terminal by simply adding a power supply, external amplifier, speaker, and microphone. For example, adding intercom to parking lot systems, teaching control systems, robots, and other equipmentfunction

SV-2703VPThe network audio module can also be used asSIPTo use the intercom broadcasting host, in addition to adding a power supply, external amplifier, speaker, and microphone, a keyboard display controlled by a serial port needs to be added.

The playback host can use our company's broadcasting system control software, network microphones, etc., or the user can choose according to our company's requirementsDLLDevelop your own broadcasting software using dynamic libraries.

Our network audio module can be used in LAN or Internet as broadcast intercom.