CN101938455A - Audio data transmission method and device - Google Patents
Audio data transmission method and device Download PDFInfo
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- CN101938455A CN101938455A CN2009100886187A CN200910088618A CN101938455A CN 101938455 A CN101938455 A CN 101938455A CN 2009100886187 A CN2009100886187 A CN 2009100886187A CN 200910088618 A CN200910088618 A CN 200910088618A CN 101938455 A CN101938455 A CN 101938455A
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Abstract
The invention discloses an audio data transmission method. The method comprises the following steps of: classifying audio data and enhancing the audio data of a set type; and discarding audio data which is not enhanced when determining that current bandwidth cannot simultaneously carry the enhanced audio data and the audio data which is not enhanced during the transmission of the audio data. The invention also discloses an audio data transmission device, which comprises a classifying unit, an enhancing unit, a determining unit and a discarding unit, wherein the classifying unit is used for classifying the audio data; the enhancing unit is used for enhancing the audio data of the set type; the determining unit is used for triggering the discarding unit when determining that the current bandwidth cannot simultaneously carry the enhanced audio data and the audio data which is not enhanced during the transmission of the audio data; and the discarding unit is used for discarding the data which is not enhanced. The method and the device can also meet the requirement of a user on audio experience of multimedia service under severe channel conditions.
Description
Technical field
The present invention relates to the audio data transmission technology, relate in particular to a kind of mobile multimedia broadcast system sound intermediate frequency data transmission method and device.
Background technology
In recent years, the development of China mobile multi-media broadcasting technology and standard is rapid, for example, hand-held (the DVB-H of the digital audio broadcasting in Europe, Digital Video Broadcast Handheld) the single forward link of medium (the Media FLO of system, the U.S., Media Forward Link Only) system and based on the China Mobile multimedia broadcasting technology and the standards such as (CMMB, China Mobile Multimedia Broadcasting) of broadcast channel.Mobile media broadcasting network provides many multimedia service contents for its terminal use, as program contents such as news, sports cast, variety show, TV play, films.
With respect to wire message way, wireless channel is more complicated.The stopping of reception environment middle-high building, receiving equipment can cause tangible signal attenuation relative to faster moving all of environment of living in.In the wireless environment, the error rate of signal transmission is more much higher than other transmission channels.Complicated, abominable propagation conditions is the feature of wireless channel.In order to guarantee the transmission quality of wireless channel, various technology occurred and reduced the adverse effect that signal attenuation causes, such as diversity, spread spectrum/frequency hopping, equilibrium, interweave and error correction coding etc.Forward error correction (FEC, Forward Error Correction) is a kind of data encoding technique that can improve the wireless channel transmission quality, and it is a kind of redundancy encoding technology of transport layer, needs the outer bandwidth of occupying volume.This technology is mainly used in the situation of a spot of error code and a small amount of packet loss, because FEC does not need the feedback information of client, so be particularly useful for the situation of one-way communication.
Voice data in the multimedia service can be distinguished it according to acoustic characteristic.Such as: audio frequency can be distinguished into a plurality of sound channels, and audio frequency has the characteristic of frequency domain etc.The common importance of sound channel that comprises mother tongue pronunciation will be higher than other languages, and the voice data of the responsive frequency domain of people's ear hearing is also even more important than the voice data of other frequency domains.Efficient Advanced Audio Coding (HE-AAC, High Efficiency Advanced Audio Coding) technology is a kind of audio coding technology that voice data is distinguished by frequency domain characteristic, the HE-AAC encoder can produce two kinds of signals when coded audio: a kind of is AAC (the Advanced Audio Coding) signal of low frequency, another kind is spectral band replication (SBR, the Spectral Band Replication) signal of high frequency.The HE-AAC decoder can utilize AAC and SBR signal, produces the signal of full frequency-domain; And the AAC decoder only uses the AAC signal, just only utilizes the low frequency composition decoding of HE-AAC.
Prior art such as real time transport protocol (RTP, Real-time Transport Protocol), transport stream technology such as (TS, Transport Stream), does not have the voice data of the different acoustic characteristics of independent process in preliminary treatment and Channel Transmission process.The subject matter of doing like this is that front end system lacks flexibility with the audio frequency of unified strategy processing different qualities; In the receiving terminal side, need more powerful handling property to finish audio decoder.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of mobile multimedia broadcast system sound intermediate frequency data transmission method and device, can finish quick transmission by voice data is classified.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of audio data transmission method comprises:
Voice data is classified, and the voice data of setting classification is carried out enhancement process; And
When sending voice data, when determining that current bandwidth can not carry the voice data of enhancement process simultaneously and not carry out the voice data of enhancement process, abandon the voice data that does not carry out enhancement process.
Preferably, described enhancement process comprises and carries out forward error correction FEC redundancy protecting.
Preferably, described FEC comprises Hamming code redundant correcting algorithm, Read-Solomon RS sign indicating number redundant correcting algorithm or low density parity check code LDPC redundant correcting algorithm.
Preferably, described voice data is classified, comprising:
By acoustic characteristic voice data is classified, the voice data of the responsive frequency domain of people's ear hearing is divided into a class, the voice data of the insensitive frequency domain of people's ear hearing is divided into a class.
Preferably, described voice data is classified, comprising:
Classify by the sound channel under the voice data.
A kind of audio data transmission apparatus comprises:
Taxon is used for voice data is classified;
The enhancement process unit is used for the voice data of setting classification is carried out enhancement process;
Determining unit when being used to send voice data, when determining that current bandwidth can not carry the voice data of enhancement process simultaneously and not carry out the voice data of enhancement process, triggers discarding unit; And
Discarding unit is used to abandon the voice data that does not carry out enhancement process.
Preferably, described enhancement process unit carries out the enhancement process of forward error correction FEC redundancy protecting to voice data.
Preferably, described FEC comprises Hamming code redundant correcting algorithm, Read-Solomon RS sign indicating number redundant correcting algorithm or low density parity check code LDPC redundant correcting algorithm.
Preferably, described taxon is classified to voice data, comprising:
By acoustic characteristic voice data is classified, the voice data of the responsive frequency domain of people's ear hearing is divided into a class, the voice data of the insensitive frequency domain of people's ear hearing is divided into a class.
Preferably, described taxon is classified to voice data, comprising:
Classify by the sound channel under the voice data.
Among the present invention, by the voice data in the broadcast channel multiplexed frame is classified, it is divided into core voice data and ordinary audio data, under the situation of the transmission channel resources deficiency in system, only transmit the core voice data, receiving terminal also can guarantee watching smoothly of broadcast program by the core voice data.The present invention realizes simple and practical.
Description of drawings
Fig. 1 is the flow chart of mobile multimedia broadcast system sound intermediate frequency data transmission method of the present invention;
Fig. 2 is the composition structural representation of mobile multimedia broadcast system sound intermediate frequency data transmission device of the present invention.
Embodiment
Basic thought of the present invention is: by the voice data in the broadcast channel multiplexed frame is classified, it is divided into core voice data and ordinary audio data, under the situation of the transmission channel resources deficiency in system, only transmit the core voice data, receiving terminal also can guarantee watching smoothly of broadcast program by the core voice data.The present invention realizes simple and practical.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
The present invention handles with the voice data in the CMMB system and transmission means is that example is further illustrated technical scheme of the present invention, but and the applied environment of non-limiting technical solution of the present invention, technical solution of the present invention is applicable to any system that audio data transmission is arranged.
Fig. 1 is the flow chart of mobile multimedia broadcast system sound intermediate frequency data transmission method of the present invention, and as shown in Figure 1, invention mobile multimedia broadcast system sound intermediate frequency data transmission method may further comprise the steps:
Step 101: voice data is classified.In the time of in the multiplexed frame that the CMMB broadcast program is encapsulated into broadcast channel frame, obtain voice data wherein to be packaged, it is classified.Voice data gets final product by its acoustic characteristic classification, as voice data medium and low frequency and high-frequency separating are come, the priority of the voice data of low frequency or high frequency is set by system, with when system transmission bandwidth can not be carried low frequency and high-frequency audio data simultaneously, only transmit the voice data (bass audio data or high-frequency audio data) of high priority.Also can come voice data is classified by user's perceptual effect of user terminal, the purpose of this mode classification is to distinguish out the voice data of core and common voice data, the core voice data refers to the voice data more important to the user, be divided into a class as voice data, the voice data of the insensitive frequency domain of people's ear hearing is divided into a class the responsive frequency domain of people's ear hearing.Voice data in the multimedia service is complicated, wherein most of voice data is to be positioned at the responsive frequency domain of people's ear hearing, and wherein also comprise the voice data of the insensitive frequency domain of people's ear hearing, voice data for the insensitive frequency domain of people's ear hearing, do not pass maybe and can not be correctly decoded even abandon, can not cause too many influence yet user's impression.For example, broadcasting service for multichannel, wherein the voice data of general L channel is a voice data commonly used, as user's mother tongue audio frequency or more general English audio frequency etc., under the situation of system channel resource deficiency, voice data that can the prioritised transmission L channel, for right audio channel data or stereo audio data, can transmit, like this, when the user exports corresponding multimedia service, also can not reduce user's impression impression.
For being provided with an importance (being equivalent to priority) sign, core audio frequency number carries out mark.
Step 102: obtain a voice data.Obtain a voice data in the multiplexed frame waiting for transmission.
Step 103: judge whether the voice data that is obtained is the core voice data, if, execution in step 105, otherwise execution in step 104.
For the core voice data, described in step 101, be provided with importance sign, this step is whether audio data carries the importance sign, if carry then be the core voice data, otherwise is the ordinary audio data
Step 104: current voice data is not carried out enhancement process such as error code recovery.Promptly this voice data is not dealt with, directly carry out the processing of step 106.
Step 105: current voice data is carried out enhancement process such as error code recovery.Promptly the core voice data is handled especially, can be broadcasted smoothly to guarantee the core voice data.For example; the core voice data is carried out the FEC redundancy protecting; FEC redundancy protecting algorithm comprises hamming coding (Hamming Code), Reed Solomon code (RS; Reed-Solomon Code), low density parity check code (LDPC; Low DensityParity Check Code) FEC algorithm such as is when generating the redundancy protecting sign indicating number, for the core voice data; can generate more longer redundancy protecting sign indicating number, so that the effect that voice data recovers is better.Under the more rich prerequisite of system bandwidth, non-core voice data is that the ordinary audio data also can be carried out the FEC redundancy protecting.When the transmission channel signal to noise ratio is big; when receiving voice data, can the core voice data be recovered receiving terminal by the voice data (through the voice data of redundancy protecting processing) that strengthens; decode again,, improve user's auditory perception to guarantee the decoding accuracy of core voice data.
Step 106: voice data is inserted buffer memory.The voice data that is about to send is stored in the buffer memory.
Step 107: obtain a voice data to be sent.
Step 108: whether the transmission bandwidth of judging current system enough carries current voice data, if could execution in step 110, otherwise execution in step 109.
Step 109: judge whether current voice data is the core voice data, if execution in step 110 then, otherwise execution in step 111.
Step 110: current voice data is carried in the transmission buffer, to be transmitted.
Step 111: abandon current voice data.
Step 112: transmission is arranged in the current voice data of transmission buffer.
The present invention separates the benefit of handling and transmitting with voice data: the voice data that system can be dissimilar according to certain tactful independent process helps promoting the transmission quality of audio frequency, also is beneficial to and more effectively utilizes the systematic function and the network bandwidth; The voice data that the receiving terminal independent process is separated, can be under the situation of systematic function deficiency, processing section voice data finish the decoding of audio frequency play, under more abominable network environment, receiving terminal can be finished the audio decoder broadcast by a voice data that the processing section transmission error code is few, thereby improves user experience.
Fig. 2 is the composition structural representation of mobile multimedia broadcast system sound intermediate frequency data transmission device of the present invention, as shown in Figure 2, mobile multimedia broadcast system sound intermediate frequency data transmission device of the present invention comprises taxon 20, enhancement process unit 21, determining unit 22 and discarding unit 23, wherein, taxon 20 is used for voice data is classified; Enhancement process unit 21 is used for the voice data of setting classification is carried out enhancement process; When determining unit 22 is used to send voice data, when determining that current bandwidth can not carry the voice data of enhancement process simultaneously and not carry out the voice data of enhancement process, trigger discarding unit 23; Discarding unit 23 is used to abandon the voice data that does not carry out enhancement process.The 21 pairs of voice datas in enhancement process unit carry out the enhancement process of forward error correction FEC redundancy protecting.Described FEC comprises Hamming code redundant correcting algorithm, Read-Solomon RS sign indicating number redundant correcting algorithm or low density parity check code LDPC redundant correcting algorithm.20 pairs of voice datas of taxon are classified, and comprising: by acoustic characteristic voice data is classified, the voice data of the responsive frequency domain of people's ear hearing is divided into a class, the voice data of the insensitive frequency domain of people's ear hearing is divided into a class.20 pairs of voice datas of taxon are classified, and comprising: classify by the sound channel under the voice data.
The realization function that it will be appreciated by those skilled in the art that the each processing unit in the mobile multimedia broadcast system sound intermediate frequency data transmission device shown in Figure 2 can be understood with reference to the associated description in the preceding method.The function of each unit can realize by the program that runs on the processor in the device shown in Figure 2, also can realize by concrete logical circuit.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. an audio data transmission method is characterized in that, comprising:
Voice data is classified, and the voice data of setting classification is carried out enhancement process; And
When sending voice data, when determining that current bandwidth can not carry the voice data of enhancement process simultaneously and not carry out the voice data of enhancement process, abandon the voice data that does not carry out enhancement process.
2. method according to claim 1 is characterized in that, described enhancement process comprises carries out forward error correction FEC redundancy protecting.
3. method according to claim 2 is characterized in that, described FEC comprises Hamming code redundant correcting algorithm, Read-Solomon RS sign indicating number redundant correcting algorithm or low density parity check code LDPC redundant correcting algorithm.
4. method according to claim 1 is characterized in that, described voice data is classified, and comprising:
By acoustic characteristic voice data is classified, the voice data of the responsive frequency domain of people's ear hearing is divided into a class, the voice data of the insensitive frequency domain of people's ear hearing is divided into a class.
5. method according to claim 1 is characterized in that, described voice data is classified, and comprising:
Classify by the sound channel under the voice data.
6. an audio data transmission apparatus is characterized in that, comprising:
Taxon is used for voice data is classified;
The enhancement process unit is used for the voice data of setting classification is carried out enhancement process;
Determining unit when being used to send voice data, when determining that current bandwidth can not carry the voice data of enhancement process simultaneously and not carry out the voice data of enhancement process, triggers discarding unit; And
Discarding unit is used to abandon the voice data that does not carry out enhancement process.
7. device according to claim 6 is characterized in that, described enhancement process unit carries out the enhancement process of forward error correction FEC redundancy protecting to voice data.
8. device according to claim 7 is characterized in that, described FEC comprises Hamming code redundant correcting algorithm, Read-Solomon RS sign indicating number redundant correcting algorithm or low density parity check code LDPC redundant correcting algorithm.
9. device according to claim 6 is characterized in that, described taxon is classified to voice data, comprising:
By acoustic characteristic voice data is classified, the voice data of the responsive frequency domain of people's ear hearing is divided into a class, the voice data of the insensitive frequency domain of people's ear hearing is divided into a class.
10. device according to claim 6 is characterized in that, described taxon is classified to voice data, comprising:
Classify by the sound channel under the voice data.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100886187A CN101938455A (en) | 2009-06-30 | 2009-06-30 | Audio data transmission method and device |
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| CN2009100886187A CN101938455A (en) | 2009-06-30 | 2009-06-30 | Audio data transmission method and device |
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| CN101938455A true CN101938455A (en) | 2011-01-05 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101268505A (en) * | 2006-01-06 | 2008-09-17 | 三菱电机株式会社 | Method and system for classifying a video |
| WO2009064067A1 (en) * | 2007-11-15 | 2009-05-22 | Sk Telecom Co., Ltd. | System and method for producing importance rate-based rich media, and server applied to the same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101268505A (en) * | 2006-01-06 | 2008-09-17 | 三菱电机株式会社 | Method and system for classifying a video |
| WO2009064067A1 (en) * | 2007-11-15 | 2009-05-22 | Sk Telecom Co., Ltd. | System and method for producing importance rate-based rich media, and server applied to the same |
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Application publication date: 20110105 |