CN202454261U

CN202454261U - Voice frequency mixing device

Info

Publication number: CN202454261U
Application number: CN201220066582XU
Authority: CN
Inventors: 曾伟; 金雨和; 喻芳; 陈文林; 莫中民
Original assignee: ZHUZHOU HUATONG TECHNOLOGY Co Ltd
Current assignee: ZHUZHOU HUATONG TECHNOLOGY Co Ltd
Priority date: 2012-02-27
Filing date: 2012-02-27
Publication date: 2012-09-26
Anticipated expiration: 2022-02-27

Abstract

The utility model discloses a voice frequency mixing device which comprises a receiver, a decoder connected with the receiver, an accumulator connected with the decoder, an encoder connected with the accumulator and a transmitter connected with the encoder. In the voice frequency mixing device, advanced audio coding (AAC) data in a real-time transport protocol (RTP) data packet are decoded into pulse codes to modulate pulse-code modulation (PCM) code data. The accumulator accumulates the PCM code data, the encoder encodes accumulated PCM code data into the AAC data according to an AAC algorithm and packages the AAC data into the RTP data package, and the transmitter transmits the RTP data package to a media processing module. Compared with the prior art, the AAC algorithm adopted by the voice frequency mixing device supports the sampling rate from 8K to 96K and supports encoding of double channels and stereophonic sound, voice recording distortion is small, and analysis degree is high. Therefore, after a terminal analyzes the data package of the voice frequency mixing device, the noise in the obtained mixed sound is small, and the sound quality and the sound effect of mixed sound are good.

Description

A kind of audio mix equipment

Technical field

The utility model relates to the audio signal processing technique field, more particularly, relates to a kind of audio mix equipment.

Background technology

At present, G.711A/G.711U audio mix equipment adopt generally that code decode algorithm mixes sound.Since G.711A/G.711U code decode algorithm realize simple, so adopt the audio mixing efficient of its audio mix equipment that sound is mixed to improve.

But; The SF of the G.711A/G.711U code decode algorithm of above-mentioned audio mix equipment sampling is lower; And only support the monophony coding, the sound recording distortion is big and resolution is low, so behind the packet of the said audio mix equipment of terminal parses; Noise is big in the audio mixing that draws, and the tonequality and the audio of audio mixing are poor.

The utility model content

For solving the problems of the technologies described above, the utility model provides a kind of audio mix equipment, is adopting after G.711A/G.711U code decode algorithm mixes sound the audio mixing tonequality that draws and the problem of audio difference to solve existing equipment.Technical scheme is following:

The utility model provides a kind of audio mix equipment, comprising: the receiver that is used to receive the real time transport protocol RTP packet that the medium process module of multipoint control unit MCU sends;

Link to each other with said receiver, be used to resolve said RTP packet, obtain the Advanced Audio Coding AAC data in the said RTP packet, and said AAC data decode is become the demoder of pulse code modulation (PCM) pcm encoder data;

Link to each other with said demoder, be used for the totalizer that said pcm encoder data are added up;

Link to each other with said totalizer, be used for algorithm, the pcm encoder digital coding after adding up is become the AAC data, and said AAC packing data is become the scrambler of RTP packet according to AAC;

Link to each other with said scrambler, be used for said RTP packet is sent to the transmitter of the medium process module of video conferencing system MCU.

Preferably, also comprise: be connected between said totalizer and the said scrambler, be used for the pcm encoder data after adding up are carried out the scaler that peak value is handled.

Preferably, said receiver is connected with said MCU through the RTP passage.

In the utility model, the AAC data in the RTP packet are decoded into pulse code modulation (PCM) pcm encoder data.Totalizer adds up to said pcm encoder data; And by scrambler according to the AAC algorithm; Pcm encoder digital coding after adding up is become the AAC data, and said AAC packing data is become the RTP packet, by transmitter the RTP packet is sent to medium process module again.Compared with prior art; The AAC algorithm that the utility model adopts is supported the sampling rate of 8K to 96K; And support two-channel and stereo coding, the sound recording distortion is very little and resolution is high, so behind the packet of the said audio mix equipment of terminal parses; Noise is very little in the audio mixing that draws, and the tonequality and the audio of audio mixing are fine.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment that put down in writing in the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

A kind of structural representation of the audio mix equipment that Fig. 1 provides for the utility model;

The another kind of structural representation of the audio mix equipment that Fig. 2 provides for the utility model;

Fig. 3 is a kind of synoptic diagram of audio mix flow process;

Fig. 4 is the another kind of synoptic diagram of audio mix flow process.

Embodiment

Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the protection domain of the utility model.

See also Fig. 1, a kind of structural representation that it shows a kind of audio mix equipment that the utility model embodiment provides can comprise: receiver 11, demoder 12, totalizer 13, scrambler 14 and transmitter 15.

Wherein, receiver 11 is used to receive RTP (Real-time Transport Protocol, the real time transport protocol) packet that the medium process module of MCU (Multipoint Control Unit, multipoint control unit) is sent.

In the present embodiment, receiver 11 can be connected with MCU through the RTP passage.When audio mix equipment is applied in the video conferencing system, the MCU in the video conferencing system controls connected RTP passage, receives the RTP packet that contains single-tone data.

Demoder 12; Link to each other with said receiver 11; Be used to resolve said RTP packet, obtain AAC (Advanced Audio Coding, the Advanced Audio Coding) data in the said RTP packet; And said AAC data decode become PCM (Pulse-code modulation, pulse code modulation (PCM)) coded data.

Totalizer 13 links to each other with said coding module 12, is used for said pcm encoder data are added up, and accomplishes the audio mixing to a plurality of single-tone data.

Scrambler 14 links to each other with said totalizer 13, is used for the algorithm according to AAC, the pcm encoder digital coding after adding up is become the AAC data, and said AAC packing data is become the RTP packet.

Transmitter 15 links to each other with said scrambler 14, is used for said RTP packet is sent to the medium process module of video conferencing system MCU.Medium process module sends to the terminal with the RTP packet again.

In the present embodiment, the AAC algorithm is supported the sampling rate of 8K to 96K, and supports two-channel and stereo coding; The sound recording distortion is very little and resolution is high; Therefore, behind the RTP packet of the said audio mix equipment of terminal parses, do not comprise noise in the audio mixing that draws; Noise is very little in the audio mixing that draws, and the tonequality and the audio of audio mixing are fine.

Need to prove: in the present embodiment, the AAC algorithm can improve the tonequality and the audio of audio mixing.But the peak value of the pcm encoder data after adding up may exceed preset range and cross the border, thereby makes data reversal, and then has howling in the audio mixing that draws, and therefore, need carry out peak value to the pcm encoder data after adding up and handle.

See also Fig. 2, the another kind of structural representation that it shows a kind of audio mix equipment that the utility model embodiment provides on Fig. 1 basis, has increased scaler 16.Wherein, scaler 16 is connected between said totalizer 13 and the said scrambler 14, is used for that the pcm encoder data after adding up are carried out peak value and handles.

In the present embodiment, peak value is handled and specifically comprised: the peak value to the pcm encoder data after adding up is judged.After peak value surpasses preset range; The peak value that shows the pcm encoder data after adding up crosses the border; Peak value is carried out zoom operations, the pcm encoder data behind the peak value convergent-divergent is sent to scrambler 14, by scrambler 14 according to the AAC algorithm; Pcm encoder digital coding behind the convergent-divergent is become the AAC data, and said AAC packing data is become the RTP packet.After peak value does not surpass preset range, show that the peak value of the pcm encoder data after adding up does not cross the border, pcm encoder data to the scrambler 14 after directly will adding up.

Wherein, preset range can be set according to the different application scene, and this is no longer limited.

Use technique scheme, the peak value of the pcm encoder data after adding up is judged, after peak value surpasses preset range, peak value is carried out zoom operations, thereby comprise howling in the audio mixing of avoiding drawing, further improve the tonequality and the audio of audio mixing.

Following illustrative example is introduced the audio mix flow process of the audio mix equipment that the utility model embodiment provides, like Fig. 3 and shown in Figure 4.Wherein, Fig. 3 and Fig. 4 are respectively the synoptic diagram of audio mix flow process.

In Fig. 3 and Fig. 4, the RTP A channel representes that RTP packet that the A terminal sends over is forwarded to audio mix equipment through the medium process module of MCU.AAC decoding and PCM representation are resolved said RTP packet, and the AAC data decode is become the pcm encoder data.Pcm encoder digital coding after the AAC coded representation will add up becomes the AAC data.

Wherein, Fig. 3 representes the flow process of A, B, C, four terminals participations of D audio mixing, and four terminals form one road audio mixing data through behind the audio mixings; And this circuit-switched data sent to the other-end of not participating in audio mixing, then other-end has been heard the sound of participating in four terminals of audio mixing.

Fig. 4 representes the flow process of A, B, C, four terminals participations of D audio mixing; Owing to can not hear the sound of oneself; The sound of B, C, D so when PCM numerical value adds up, only added up, B, C, three terminals of D form one road audio mixing data through behind the audio mixing; And this circuit-switched data sent to the A terminal of participating in audio mixing, then other discussion sound of three have been heard at the A terminal.

Need to prove; In this article; Relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint relation or the order that has any this reality between these entities or the operation.And; Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability; Thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements; But also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.

To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment is conspicuous to those skilled in the art, and defined General Principle can realize under the situation of spirit that does not break away from the utility model or scope in other embodiments among this paper.Therefore, the utility model will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and the corresponding to wide region of features of novelty.

Claims

1. an audio mix equipment is characterized in that, comprising: the receiver that is used to receive the real time transport protocol RTP packet that the medium process module of multipoint control unit MCU sends;

2. audio mix equipment according to claim 1 is characterized in that, also comprises: be connected between said totalizer and the said scrambler, be used for the pcm encoder data after adding up are carried out the scaler that peak value is handled.

3. audio mix equipment according to claim 1 and 2 is characterized in that, said receiver is connected with said MCU through the RTP passage.