CN100429884C - Network transmission of audio signal and matrix switching method - Google Patents
Network transmission of audio signal and matrix switching method Download PDFInfo
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- CN100429884C CN100429884C CNB2004100172485A CN200410017248A CN100429884C CN 100429884 C CN100429884 C CN 100429884C CN B2004100172485 A CNB2004100172485 A CN B2004100172485A CN 200410017248 A CN200410017248 A CN 200410017248A CN 100429884 C CN100429884 C CN 100429884C
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Abstract
The present invention discloses a network transmission and matrix switching method for audio signals, which realizes the transmission and the switching of the audio signals on the Ethernet. The network transmission and matrix switching method for audio signals is on the basis of a communication protocol for transmitting the audio signals by the Ethernet, namely a CobraNet protocol, and the transmission and the switching of the audio signals on the Ethernet are realized by network audio interface equipment and control equipment. The method comprises the steps of signal transformation, signal compounding, signal transmission, signal receiving and decomposition, signal conversion and switching control. The method greatly simplifies the design and the construction of a transmission and switching system, saves the laying of a large quantity of cables, saves the cable cost and reduces the engineering quantity of the laying; the timbre loss is little during the transmission and switching process, control modes are flexible, the transmission quality of the audio signals is ensured, the switching function of the system is enhanced, and the present invention establishes a technical foundation for constructing an intellectualized and networking audio system.
Description
Technical field
The present invention relates to a kind of transmission of audio signals and changing method, particularly a kind of Network Transmission of audio signal and matrix changing method, it is the CobraNet agreement that this method is utilized the communications protocol of Ethernet transmitting audio signal, realize transmission and the switching of audio signal on Ethernet, be applied in the audio signal switched system of public broadcasting, public address, meeting and radio, TV and film industries.
Background technology
The audio signal switched system in public broadcasting, public address and broadcasting and TV audio system in occupation of consequence, it is directly connected to the tonequality assurance of audio signal, the fail safe assurance of system and the ease of use and the flexibility of system, and in the cost of whole audio system, also occupied suitable component, directly have influence on the cost of system.At present, the simplest audio transmission switched system is the artificial exchange of carrying out signal by jack panel.Along with development of electronic technology, produced analogue audio frequency matrix based on analogue technique, improved the flexibility and the controlled ability of system greatly, can also realize the automatic switchover of signal simultaneously.Occurred the digital audio matrix based on digital switching technology afterwards again, advanced numeral exchange and treatment technology make the tonequality loss of audio signal in the transmission handoff procedure of character matrix reduce to minimum, and the handoff functionality of system is then strengthened greatly.Though the exchange principle of analog matrix and character matrix has had very big different, but its system configuration is similar substantially, all be to be central apparatus with the Audio Matrix, this Audio Matrix has signal input output interface, the audio signal of each source of sound is transported to Audio Matrix by audio cable, after the Audio Matrix exchange, be transported to each audio frequency apparatus by audio cable again.Such structure, system's bulky complex, it is big not only to build engineering, time-consuming taking a lot of work, and safeguard also very difficulty.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the defective that prior art exists, and a kind of design and the audio signal Network Transmission of construction and the method that matrix switches that can simplify the audio signal switched system greatly is provided.
The present invention addresses the above problem the technical scheme of being taked: the Network Transmission of this audio signal and matrix changing method, be characterized in: the communications protocol that described method is based on the Ethernet transmitting audio signal is the CobraNet agreement, realize transmission and the switching of audio signal on Ethernet by network audio interface equipment and control appliance, this method comprises signal transformation step, signal composite steps, signal transmitting step, signal reception and decomposition step, conversion of signals step, and the switching controls step, described:
A, signal transformation step with the signal conversion circuit of each road analog/digital input audio signal through the network audio interface equipment, are transformed into the data flow that meets the requirement of Ethernet transmitting audio signal;
B, signal composite steps with the stream of the multi-path audio-frequency data after the conversion, are combined into a transmission packet with unique number by the CobraNet communications protocol;
C, signal transmitting step, according to the switching controls requirement, the send mode of determination data bag, transmission destination address, and on Ethernet, transmit;
D, signal receive and decomposition step, and according to the order that control appliance sends, the selective reception mode receives packets of audio data, and will receive the data flow that packet resolves into each output channel;
E, conversion of signals step, the data flow that decomposites become the output of analog/digital audio signal by signaling conversion circuit;
F, switching controls step, control appliance are switched requirement by audio signal and are sent the switching controls order, and the Control Network audio interface device changes the reception packet numbers, realizes the switching of output/input audio signal.
Signal transmitting step of the present invention is according to accepting number of users, select suitable transmission means, and the transmission means that sends packet has point-to-point transmission, point-to-multipoint transmission, or the broadcast type transmission.
Signal of the present invention receive and decomposition step in the order of sending of each network audio interface equipment according to control appliance, change and receive packet numbers and receive son number in the packet, receive and the consistent transmission packet of reception package number.
Signal reception of the present invention and decomposition step are in the internal signal of same network audio interface equipment exchanges and duplicates, number and encircle certainly the output channel numbering by changing, or change is duplicated the input channel numbering and is duplicated the output channel numbering from encircling input channel.
Switching controls step of the present invention is that control appliance switches requirement according to signal, sends the switching controls order for each network audio interface equipment, promptly changes to receive packet numbers and receive son number in the packet, to realize the switching of output audio signal.
Switching controls command transfer mode of the present invention is the shared Ethernet physical medium of a, switching controls order and audio signal data, realizes with the net transmission; Or b, switching controls order transmit by other network channels; Or c, utilize the serial or parallel PORT COM that control command directly is transferred to the network audio interface equipment: or d, by the serial ports/network interface of certain one or more network audio interface equipment, other network audio interface equipments are sent control command.
Switching controls order of the present invention can real-time release, also can send by non real-time, the demanded storage that non real-time sends is in the memory of network audio interface equipment, and the network audio interface equipment will automatically perform the audio signal switching controls according to the order of storage.
The present invention compared with prior art has following useful effect: 1, audio signal Network Transmission and matrix changing method utilize the CobraNet communications protocol, being implemented in the networked matrix that transmits multichannel high-quality audio signal and audio signal on the Ethernet switches, the design and the construction of audio signal transmission and switched system have been simplified greatly, save laying of a large amount of audio cable, saved the cable cost, reduced the laying work amount.2, utilize the CobraNet communications protocol to realize transmission of audio signals and switching, tonequality loss in transmission and the handoff procedure is few, control mode is versatile and flexible, guaranteed the transmission of audio signals quality, strengthened the handoff functionality of system, for make up intellectuality, networked audio system has been established technical foundation.
Description of drawings
Fig. 1 is audio signal Network Transmission of the present invention and matrix changing method schematic flow sheet.
Fig. 2 is for using example network structural representation of the present invention.
Embodiment
The step of embodiment is referring to Fig. 1.The communications protocol that this audio signal transmission and changing method are based on the Ethernet transmitting audio signal is the CobraNet agreement, realize transmission and the switching of audio signal on Ethernet by network audio interface equipment and control appliance, this method comprises signal transformation step, signal composite steps, signal transmitting step, signal reception and decomposition step, conversion of signals step, and the switching controls step.
1, signal transformation step, with the signal conversion circuit of each road analog/digital input audio signal through the network audio interface equipment, transformed samples rate and resolution, obtaining sample rate is that 48KHZ, resolution are the serial data stream that the Ethernet transmitting audio signal requires that meets of 20 bits/24 bits.
2, signal composite steps with per 7 road after conversion or 8 road serial data streams, is combined into an original transmission packet with unique number.
3, signal transmitting step requires and the reception number of users according to switching controls, and the transmission means that sends packet is set automatically, will send packet and transmit on Ethernet.
The transmission means that sends packet has multiple.A kind of is to send point-to-pointly, that is to say that this packet can only be received by a receiving equipment.Another kind is that point-to-multipoint ground sends, and that is to say that this packet can be received simultaneously by a plurality of receiving equipments.Also having a kind of is the broadcast type transmission, that is to say that this packet can be received by network audio interface equipments all in the network.The present invention is according to receiving number of users, and dynamically decision sends the send mode of packet.When receiving the user and have only one, adopt point-to-point transmission, when receiving number of users and being less than preset value quantity, adopt the point-to-multipoint transmission: when receiving the user, adopt the broadcast mode transmission greater than preset value quantity.Thereby utilize the network bandwidth to greatest extent, realize that the network of audio signal switches.
4, signal receives and decomposition step, the order that network audio interface equipment receiving control apparatus sends, and the reception packet that changes each network audio interface equipment is Bundle number and receives son Submap in the packet.Network audio interface equipment will will determine that at first it receives packet numbers when Ethernet receives packet, and each receives data and is surrounded by a numbering.When the numbering that sends packet and reception packet was consistent, output equipment just can receive this packet.By receiving the son number in the packet, just can decomposite the output channel in the reception packet again.
When the output signal of network audio interface equipment comes from the input signal of itself, can be by changing from encircling the input channel numbering and encircling the output channel numbering certainly and realize.Do not need to be provided with and receive packet and son thereof number, only need to change from encircling the input channel numbering and encircle the output channel numbering certainly and just can realize, thereby save the network bandwidth.
When a network audio interface equipment a plurality of are outputted to same source of sound, can duplicate the input channel numbering and duplicate the realization of output channel numbering by change, first output is by changing the reception packet numbers and receiving for sub number, other output is duplicated the input channel numbering and is duplicated the output channel numbering by change, and first defeated sound source signal is duplicated output at device interior.
In the present embodiment, realized that according to accepting state dynamic adjustments send mode and receive mode are fully saved bandwidth, and proposed to utilize Control Software and network audio interface equipment, realize any switching between the I/O audio signal of each network audio interface equipment.
5, conversion of signals step with the serial voice data that decomposites, by signaling conversion circuit, becomes simulated audio signal/digital audio and video signals output.
6, switching controls step is that control appliance switches requirement according to signal, sends the switching controls order for each network audio interface equipment, promptly changes to receive packet numbers and receive son number in the packet, to realize the switching of output audio signal.The switching controls order can with the shared Ethernet physical medium of audio signal data, realize with the net transmission; Also can transmit by other network channels; Can also utilize serial or parallel PORT COM such as RS232/RS422 that control command directly is transferred to the network audio interface equipment; Can also send control command to other network audio interface equipments by the serial ports/network interface of certain one or more network audio interface equipment.The switching controls order can real-time release, also can send by non real-time, and the demanded storage that non real-time sends is in the memory of network audio interface equipment, and the network audio interface equipment will automatically perform the audio signal switching controls according to the order of storage.
The example network structure of using audio signal transmission of the present invention and method for switching network is referring to Fig. 2.The audio signal switched system mainly is made of network audio interface equipment, control appliance and Ethernet.In this application example, control appliance is a control computer that Control Software has been installed, control appliance, network audio interface equipment are connected with Ethernet by category-5 cable CAT-5 or optical fiber, and utilizing simple network communication protocol is SNMP, to each network audio interface equipment transmitting control commands.Can transmitting audio data on the netting twine, again can transmission of control signals.Under some application scenario, control appliance also can directly be connected by the RS232/RS422 connection with each network audio interface equipment.
Because each network audio interface equipment is to connect by Ethernet, each network audio interface equipment can disperse to be placed near each source of sound, and do not need with the audio signal concentration of transmissions to certain a bit to exchange again, thereby save a large amount of audio transmission cables.
The network audio interface equipment patent applied for that this audio signal Network Transmission and matrix changing method application example are adopted, this interface equipment has following feature:
1, the CobraNet agreement be can adopt, the transmission and the reception of audio signal carried out.
2, can utilize ICP/IP protocol or other network transmission protocols, the order of sending by the port receiving computer, or receive another interface equipment by etc. the time asynchronous transmission control protocol control command sent, also can pass through R5232, serial data host-host protocols such as RS422, directly receive the order that control computer or other control appliance send, and according to this command selection receive mode, the reception parameter is set, change this machine audio frequency output channel and this machine audio input channel and other adopt the CobraNet agreement to send the virtual connection of setting up between the audio input channel of equipment of audio signal on the net, thereby realize the switching of output audio signal.
3, according to each input channel audio signal by the virtual quantity that is connected to output channel, dynamically change the transmission means that this machine sends packet, point-to-point, point-to-multipoint or broadcast type, intelligent regulating networks data traffic.
The control appliance that this application example adopts has following feature:
1, can utilize ICP/IP protocol or other network transmission protocols, send the audio signal switching command for each network audio interface equipment by port, also can directly send the audio signal switching command by RS232, RS422 mouth to interface equipment, control send mode, receive mode and the reception parameter values of each audio interface device packet, change the audio frequency output channel of each audio interface device and adopt the CobraNet agreement to send virtual connection between the audio input channel of equipment of audio signal on the net, thereby realize the switching of output audio signal.
2, can utilize ICP/IP protocol or other network transmission protocols, or carry out exchanges data, obtain the running state parameter of each audio frequency apparatus, carry out the equipment running status monitoring by serial data host-host protocol such as RS232, RS422 and network audio interface equipment.
Claims (5)
1, a kind of Network Transmission of audio signal and matrix changing method, it is characterized in that: described method is based on the CobraNet agreement at the Ethernet transmitting audio signal, realize transmission and the switching of audio signal on Ethernet by network audio interface equipment and control appliance, this method comprises signal transformation step, signal composite steps, signal transmitting step, signal reception and decomposition step, conversion of signals step, and the switching controls step, described:
A, signal transformation step with the signal conversion circuit of each road analog/digital input audio signal through the network audio interface equipment, are transformed into the data flow that meets the requirement of Ethernet transmitting audio signal;
B, signal composite steps with the stream of the multi-path audio-frequency data after the conversion, are combined into a transmission packet with unique number by the CobraNet communications protocol;
C, signal transmitting step, according to the switching controls requirement, the send mode of determination data bag, transmission destination address, and on Ethernet, transmit;
D, signal receive and decomposition step, and according to the order that control appliance sends, the selective reception mode receives packets of audio data, and will receive the data flow that packet resolves into each output channel;
D1, described signal receive and decomposition step in the order of sending of each network audio interface equipment according to control appliance, change and receive packet numbers and receive son number in the packet, receive and receive the consistent transmission packet of package number;
D2, the reception of described signal and decomposition step are in the internal signal of same network audio interface equipment exchanges and duplicates, number and encircle certainly the output channel numbering by changing, or change is duplicated the input channel numbering and is duplicated the output channel numbering from encircling input channel;
E, conversion of signals step, the data flow that decomposites become the output of analog/digital audio signal by signaling conversion circuit;
F, switching controls step, control appliance are switched requirement by audio signal and are sent the switching controls order, and the Control Network audio interface device changes the reception packet numbers, realizes the switching of output/input audio signal.
2, audio signal Network Transmission according to claim 1 and matrix changing method, it is characterized in that: described signal transmitting step is according to receiving number of users, selecting suitable transmission means, the transmission means that sends packet has point-to-point transmission, point-to-multipoint transmission, or the broadcast type transmission.
3, audio signal Network Transmission according to claim 1 and matrix changing method, it is characterized in that: described switching controls step is that control appliance switches requirement according to signal, send the switching controls order for each network audio interface equipment, promptly change to receive packet numbers and receive son number in the packet, to realize the switching of output audio signal.
4, audio signal Network Transmission according to claim 3 and matrix changing method is characterized in that: described switching controls command transfer mode is the shared Ethernet physical medium of a, switching controls order and audio signal data, realizes with the net transmission; Or b, switching controls order transmit by other network channels; Or c, utilize the serial or parallel PORT COM that control command directly is transferred to the network audio interface equipment; Or d, the serial ports/network interface by certain one or more network audio interface equipment, other network audio interface equipments are sent control command.
5, audio signal Network Transmission according to claim 4 and matrix changing method, it is characterized in that: described switching controls order is that real-time release or non real-time send, the demanded storage that non real-time sends is in the memory of network audio interface equipment, the network audio interface equipment will automatically perform the audio signal switching controls according to the order of storage.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100172485A CN100429884C (en) | 2004-03-29 | 2004-03-29 | Network transmission of audio signal and matrix switching method |
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| CNB2004100172485A CN100429884C (en) | 2004-03-29 | 2004-03-29 | Network transmission of audio signal and matrix switching method |
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| CN1564519A CN1564519A (en) | 2005-01-12 |
| CN100429884C true CN100429884C (en) | 2008-10-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101102302B (en) * | 2006-07-04 | 2010-04-14 | 北京江南天安科技有限公司 | Multi-channel audio and video signal output switcher and audio and video monitoring system and its switching method |
| IT1395782B1 (en) * | 2009-10-02 | 2012-10-19 | Larimart Spa | AUDIO COMMUNICATION DEVICE IN CONFERENCE, NETWORK AND METHOD |
| CN102801537A (en) * | 2012-06-12 | 2012-11-28 | 东莞市龙健电子有限公司 | Digital power amplification system of Ethernet power source electricity network |
| CN104570832B (en) * | 2014-11-25 | 2017-09-19 | 中山大学花都产业科技研究院 | A kind of network control method of audio frequency apparatus |
| CN110850771A (en) * | 2019-11-11 | 2020-02-28 | 深圳市创凯智能股份有限公司 | Signal channel switching method, terminal device and computer readable storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303198A (en) * | 1999-10-26 | 2001-07-11 | 三星电子株式会社 | Real time audio frequency/videofrequency communication method and equipment used on internet |
| CN1411278A (en) * | 2002-11-25 | 2003-04-16 | 北京邮电通信设备厂 | IP network TV conference system |
| CN1416250A (en) * | 2002-12-10 | 2003-05-07 | 北京明瑞智环科技有限公司 | Bridge set and method for different codes in VDIP voice encoding |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303198A (en) * | 1999-10-26 | 2001-07-11 | 三星电子株式会社 | Real time audio frequency/videofrequency communication method and equipment used on internet |
| CN1411278A (en) * | 2002-11-25 | 2003-04-16 | 北京邮电通信设备厂 | IP network TV conference system |
| CN1416250A (en) * | 2002-12-10 | 2003-05-07 | 北京明瑞智环科技有限公司 | Bridge set and method for different codes in VDIP voice encoding |
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Assignee: LINKER DIGITAL TECHNOLOGY CO.,LTD. Assignor: Hangzhou Desi Technology Co.,Ltd. Contract record no.: 2011330001149 Denomination of invention: Network transmission of audio signal and matrix switching method Granted publication date: 20081029 License type: Exclusive License Open date: 20050112 Record date: 20110909 |
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