CN101175104B - Dithering caching device and its management method - Google Patents
Dithering caching device and its management method Download PDFInfo
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- CN101175104B CN101175104B CN2006101504491A CN200610150449A CN101175104B CN 101175104 B CN101175104 B CN 101175104B CN 2006101504491 A CN2006101504491 A CN 2006101504491A CN 200610150449 A CN200610150449 A CN 200610150449A CN 101175104 B CN101175104 B CN 101175104B
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Abstract
The invention discloses a jitter cache device comprising a plurality of jitter caches with various priorities. A plurality of jitter caches are connected in parallel and used to save the received data packet. The jitter cache with the highest priority is also used to send the saved data packet. The invention also discloses the management method of jitter caches, firstly a plurality of jitter caches receive the data packet successively according to the priority, then the jitter cache with the highest priority sends the saved data packet according to the serial number of the data packet. By the parallel connection of a plurality of jitter caches, the invention increases the memory space of the jitter caches and reduces the occurrence of the overflow. By moving the received data packet of jitter caches in all levels, the invention expands the memory space of the jitter cache with the higher priority and reduces the occurrence of the underflow situation. Moreover, the invention does not compact or stretch the data packet on time, thereby not bringing about the sound distortion and not increasing the total delay time.
Description
Technical field
The present invention relates to the network transmission technology field, especially relate to a kind of dithering cache device and dithering cache management method.
Background technology
Along with the extensive use of IP phone, the voice quality of IP phone more and more is subjected to people's attention, and influences 3 factors that mainly contain of IP phone quality: shake, grouping time-delay and packet loss.Main employing is the jitter buffer technology in voice jitter is handled, and promptly sets a dithering cache the recipient, and packet at first enters in the dithering cache temporary when arriving, and dithering cache sends to decoder to stablize mild speed with packet again.This buffer technology can effective processed voice be shaken in certain limit, improves tonequality.
The task of dithering cache is the storage packet so that cover packet jitter, and the voice quality of VoIP (Voice overIP, IP network carry voice traffic) network and equipment is had very important influence.Because IP network does not have fixing transmission path, so each packet can be selected different routes from the starting point to the destination, so packet seldom can arrive at according to the order identical with transmission.Dithering cache rearranges packet by determining arrival time and the variation that adapts to network time, recovers correct order.At present, dithering cache all has only one-level, is divided into two kinds of definite value dithering cache and adaptive jitter bufferings.
The definite value dithering cache is disposed by producer based on hardware.Gather around reasons such as match owing to intermediate transmission path difference and network during the IP network transmitting data, can cause packet not arrive according to order, therefore synchronization has a plurality of packets arrival or does not have packet to arrive, and the data packet length that the arrival dithering cache occurs is greater than or less than the situation of dithering cache length.When the data packet length that arrives dithering cache during greater than dithering cache length, the overflow phenomenon appears, and must abandon greater than the partial data bag this moment, increased the packet loss of system; When the data packet length that arrives dithering cache during less than dithering cache length, the underflow phenomenon appears, and this moment, system adopted the method for bag-losing hide to produce a packet, had reduced voice quality.For example, the length of supposing dithering cache is 40 milliseconds, and a length of data package is 20 milliseconds.If synchronization has three data packet arrival jitter buffer memorys, the overflow situation then appears, must abandon a packet; If at a time do not have packet arrival or have only a data packet arrival jitter buffer memory, the underflow situation then appears, and dithering cache must send 40 milliseconds packet, and system adopts the method for bag-losing hide to produce a packet, and this moment, voice quality will descend.
Adaptive jitter buffering adopts the flexible method of voice signal to adapt to the change of network delay based on software.When the overflow situation occurring, packet is compressed in time, to adapt to the size of dithering cache; When the underflow situation occurring, packet is stretched in time, to adapt to the size of dithering cache.For example, the length of supposing dithering cache is 40 milliseconds, and a length of data package is 20 milliseconds.If synchronization has three data packet arrival jitter buffer memorys, the overflow situation appears, and then three data were wrapped on the time and compress, the total time that makes three packets is 40 milliseconds; If at a time have only a data packet arrival jitter buffer memory, the underflow situation appears, then this packet stretched in time, make the time of this packet become 40 milliseconds.
But, when adopting adaptive jitter buffering, can produce the sound distortion.When packet was carried out time compression, normal voice was play on the shorter time, can make the hearer feel that voice are narrow; When packet was carried out time-stretching, normal voice was play on the longer time, can make the hearer feel that voice are slow.In addition, packet is carried out time compression or time-stretching, can increase operand, need to consume the regular hour, increased total time of delay.
Summary of the invention
The problem to be solved in the present invention provides a kind of dithering cache device and dithering cache management method, to overcome in the prior art defective that causes voice quality to reduce owing to overflow situation or underflow situation.
For achieving the above object, the technical scheme of one embodiment of the present of invention provides a kind of dithering cache device, comprises a plurality of dithering caches with different priorities, and described a plurality of dithering caches are in parallel, and are used to store the packet that receives; The dithering cache that priority is the highest also is used to send the packet of being stored.
According to one aspect of the present invention, after the dithering cache storage that priority is high was full, the described packet that receives was stored into the low dithering cache of priority.
According to another aspect of the present invention, the dithering cache that priority is high is not stored when full, and its next stage dithering cache moves the packet stored to the high dithering cache of described priority.
According to another aspect of the present invention, when the sequence number of the packet of the dithering cache storage that priority is high identifies greater than the sequence number sign of the packet of the low dithering cache storage of priority, exchange described packet.
According to another aspect of the present invention, each dithering cache length is identical.
The technical scheme of one embodiment of the present of invention provides a kind of dithering cache management method, may further comprise the steps: a plurality of dithering caches receive packet successively according to priority; The packet that the dithering cache that priority is the highest is stored according to the sequence number sign transmission of packet.
According to another aspect of the present invention, described a plurality of dithering caches receive packet and are specially: the dithering cache that priority is high receives described packet; After the dithering cache storage that described priority is high was full, the dithering cache that priority is low received described packet; All whether storage is full to judge all dithering caches, if then abandon remaining packet.
According to another aspect of the present invention, after receiving packet, also comprise and move the described packet that receives, be specially: judge whether the high dithering cache of priority is stored full, if storage is not full, judge then whether its next stage dithering cache has available packet; If have, then move described available packet to the high dithering cache of described priority.
According to another aspect of the present invention, also comprised before sending packet the described packet that receives is sorted, be specially: whether the sequence number sign of judging the packet that the sequence number sign of the dithering cache storage that priority is high is maximum identifies less than the sequence number of the sequence number sign minimal data bag of the low dithering cache storage of priority; If not, then exchange described packet.
Compared with prior art, the technical scheme of one embodiment of the present of invention has the following advantages:
The present invention is in parallel by a plurality of dithering caches, has increased the memory space of dithering cache, has reduced the generation of overflow situation.
And the present invention replenishes the memory space of the high dithering cache of priority by moving the packet that dithering caches at different levels receive, and has reduced the generation of underflow situation.
Further, the present invention does not carry out time compression or time-stretching to packet, can not produce the sound distortion, can not increase total time of delay.
Description of drawings
Fig. 1 is the structure chart of a kind of speech data receiving system of the present invention;
Fig. 2 is the flow chart of a kind of dithering cache management method of the present invention;
Fig. 3 is the RTP data packet arrival sequence chart of the embodiment of the invention one.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail:
The structure of a kind of speech data receiving system of the present invention as shown in Figure 1, comprise dithering cache device 11 and decoder 12, dithering cache device 11 further comprises n dithering cache 111 with different priorities, wherein the priority of 1 grade of dithering cache is the highest, and the priority of n level dithering cache is minimum.The length of each dithering cache 111 is identical, is connected in parallel, and is used to store the packet that receives; 1 grade of dithering cache also is used to send the packet stored to decoder 12.
After dithering cache device 11 received packet, this packet at first was stored into the high dithering cache of priority, have only the storage of the high dithering cache of priority full after, this packet just can be stored into the low dithering cache of priority.When the high dithering cache of priority is not stored when full,, then move this packet to the high dithering cache of priority if in its next stage dithering cache available packet is arranged.When the sequence number that stores packet in the low dithering cache of priority identifies the sequence number sign of the packet of storing less than the high dithering cache of priority, the position of exchange data packets, the sequence number sign of packet that makes the storage of the high dithering cache of priority is less than the sequence number sign of the packet of the low dithering cache storage of priority.
The flow process of a kind of dithering cache management method of the present invention as shown in Figure 2, at first a plurality of dithering caches receive packet successively according to priority, the dithering cache that priority is the highest sends the packet of being stored according to the sequence number of packet sign then.With reference to Fig. 2, the present invention includes following steps:
Step s201, the dithering cache device receives packet.
Step s202 is stored into the high dithering cache of priority with described packet.
Step s203 judges whether the high dithering cache of described priority is stored completely, if then change step s206; Otherwise change step s204.
Step s204 judges whether its next stage dithering cache has available packet; If have, then change step s205; Otherwise change step s210.
Step s205 moves described available packet to its upper level dithering cache, and changes step s203.
Step s206 is stored into the next stage dithering cache with remaining packet.
Step s207, judge described packet whether all storage finish, if then change step s210; Otherwise change step s208.
Step s208, all whether storage is full to judge all dithering caches, if then change step s209; Otherwise change step s206.
Step s209 abandons remaining packet.
Step s210, whether the sequence number sign of judging the packet that the sequence number sign of the high dithering cache of priority storage is maximum is less than the sequence number sign of the sequence number sign minimal data bag of the low dithering cache storage of priority, if then change step s212; Otherwise change step s211.
Step s211 exchanges described packet, and changes step s210.
Step s212, the packet that the dithering cache transmission that priority is the highest is stored is to decoder.
Below in conjunction with embodiment, the specific embodiment of the present invention is described in further detail:
Embodiment one, adopts the dithering cache device with 3 grades of dithering caches in the present embodiment, and wherein the priority of 1 grade of dithering cache is the highest, and each dithering cache length all is 40ms, and the jitter delay time is 40ms; A kind of RTP (Realtime Transfer Protocol, RTP) data packet arrival sequence as shown in Figure 3, wherein each RTP length of data package is 20ms.
With reference to Fig. 3, the time that first RTP packet arrives the dithering cache device is 120ms, and its sequence number is designated 1; The time of second RTP packet arrival dithering cache device is 145ms, and its sequence number is designated 2; The time of the 3rd RTP packet arrival dithering cache device is 170ms, and its sequence number is designated 3; The time of the 4th RTP packet arrival dithering cache device is 205ms, and its sequence number is designated 4; The time of the 5th RTP packet arrival dithering cache device is 215ms, and its sequence number is designated 5; The time of the 6th RTP packet arrival dithering cache device is 230ms, and its sequence number is designated 6; The time of the 7th RTP packet arrival dithering cache device is 250ms, and its sequence number is designated 7.
Because it is 120ms that first RTP packet arrives the time of dithering cache device, dithering cache length is 40ms, the jitter delay time is 40ms, so 1 grade of dithering cache sends to decoder respectively at 160ms, 200ms, 240ms, 280ms equal time with the packet of being stored; Again because length of data package is 20ms, so each dithering cache can be stored two packets.
When present embodiment adopted dithering cache management method shown in Figure 2, the transmission course of RTP packet was as follows:
At 120ms during the 160ms, sequence number is designated 1 and 2 RTP packet and arrives the dithering cache device, with reference to Fig. 2, its transmission course may further comprise the steps:
Step s201, dithering cache device Receive sequence number is designated 1 and 2 RTP packet.
Step s202 is stored into 1 grade of dithering cache with described packet.
Step s203 judges whether 1 grade of dithering cache is stored completely, if then change step s206; Otherwise change step s204.1 grade of dithering cache has been stored 2 packets in the present embodiment, has stored and has expired, so change step s206.
Step s206 is stored into the next stage dithering cache with remaining packet.There is not remaining packet in the present embodiment.
Step s207, judge described packet whether all storage finish, if then change step s210; Otherwise change step s208.Packet is all stored and is finished in the present embodiment, so change step s210.
Step s210, whether the sequence number sign of judging the packet that the sequence number sign of the high dithering cache of priority storage is maximum is less than the sequence number sign of the sequence number sign minimal data bag of the low dithering cache storage of priority, if then change step s212; Otherwise change step s211.2 grades of dithering caches are not stored packet in the present embodiment, so change step s212.
Step s212,1 grade of dithering cache are when 160ms, and sending sequence number is designated 1 and 2 RTP packet to decoder.
At 160ms during the 200ms, have only sequence number to be designated 3 RTP packet and arrive the dithering cache device, with reference to Fig. 2, its transmission course may further comprise the steps:
Step s201, dithering cache device Receive sequence number is designated 3 RTP packet.
Step s202 is stored into 1 grade of dithering cache with described packet.
Step s203 judges whether 1 grade of dithering cache is stored completely, if then change step s206; Otherwise change step s204.1 grade of dithering cache has been stored 1 packet in the present embodiment, and storage is not full, so change step s204.
Step s204 judges whether its next stage dithering cache has available packet; If have, then change step s205; Otherwise change step s210.2 grades of dithering caches do not have available packet in the present embodiment, so change step s210.
Step s210, whether the sequence number sign of judging the packet that the sequence number sign of the high dithering cache of priority storage is maximum is less than the sequence number sign of the sequence number sign minimal data bag of the low dithering cache storage of priority, if then change step s212; Otherwise change step s211.2 grades of dithering caches are not stored packet in the present embodiment, so change step s212.
Step s212,1 grade of dithering cache are when 200ms, and transmission is designated 3 RTP packet to decoder.
At 200ms during the 240ms, sequence number is designated 4,6 and 5 RTP packet and arrives the dithering cache device successively, with reference to Fig. 2, its transmission course may further comprise the steps:
Step s201, dithering cache device Receive sequence number successively are designated 4,6 and 5 RTP packet.
Step s202 is stored into 1 grade of dithering cache with described packet.Because 1 grade of dithering cache can only be stored 2 RTP packets,, sequence number is stored into 1 grade of dithering cache so being designated 4 and 6 RTP packet.
Step s203 judges whether 1 grade of dithering cache is stored completely, if then change step s206; Otherwise change step s204.1 grade of dithering cache has been stored 2 packets in the present embodiment, has stored and has expired, so change step s206.
Step s206 is stored into the next stage dithering cache with remaining packet.In the present embodiment sequence number is designated 5 RTP packet and is stored into 2 grades of dithering caches.
Step s207, judge described packet whether all storage finish, if then change step s210; Otherwise change step s208.Packet is all stored and is finished in the present embodiment, so change step s210.
Step s210, whether the sequence number sign of judging the packet that the sequence number sign of the high dithering cache of priority storage is maximum is less than the sequence number sign of the sequence number sign minimal data bag of the low dithering cache storage of priority, if then change step s212; Otherwise change step s211.The sequence number sign that the sequence number of 1 grade of dithering cache storage is designated 6 packet in the present embodiment is designated the sequence number sign of 5 packet greater than the sequence number of 2 grades of dithering caches storages, so change step s211.
Step s211, the exchange sequence number be designated 6 and sequence number be designated 5 packet, and change step s210.At this moment, 1 grade of dithering cache stores sequence number and is designated 4 and 5 RTP packet, and 2 grades of dithering caches store sequence number and are designated 6 RTP packet.
Step s210, whether the sequence number sign of judging the packet that the sequence number sign of the high dithering cache of priority storage is maximum is less than the sequence number sign of the sequence number sign minimal data bag of the low dithering cache storage of priority, if then change step s212; Otherwise change step s211.The sequence number sign that the sequence number of 1 grade of dithering cache storage is designated 5 packet in the present embodiment is designated the sequence number sign of 6 packet less than the sequence number of 2 grades of dithering caches storages, so change step s212.
Step s212,1 grade of dithering cache are when 240ms, and sending sequence number is designated 4 and 5 RTP packet to decoder.
At 240ms during the 280ms, have only sequence number to be designated 7 RTP packet and arrive the dithering cache device, with reference to Fig. 2, its transmission course may further comprise the steps:
Step s201, dithering cache device Receive sequence number is designated 7 RTP packet.
Step s202 is stored into 1 grade of dithering cache with described packet.
Step s203 judges whether 1 grade of dithering cache is stored completely, if then change step s206; Otherwise change step s204.1 grade of dithering cache has been stored 1 packet in the present embodiment, and storage is not full, so change step s204.
Step s204 judges whether its next stage dithering cache has available packet; If have, then change step s205; Otherwise change step s210.2 grades of dithering caches have sequence number to be designated 6 RTP packet can to use in the present embodiment, so change step s205.
Step s205, mobile sequence number is designated 6 RTP packet to 1 grade dithering cache, and changes step s203.
Step s203 judges whether 1 grade of dithering cache is stored completely, if then change step s206; Otherwise change step s204.1 grade of dithering cache has been stored 2 packets in the present embodiment, has stored and has expired, so change step s206.
Step s206 is stored into the next stage dithering cache with remaining packet.There is not remaining packet in the present embodiment.
Step s207, judge described packet whether all storage finish, if then change step s210; Otherwise change step s208.Packet is all stored and is finished in the present embodiment, so change step s210.
Step s210, whether the sequence number sign of judging the packet that the sequence number sign of the high dithering cache of priority storage is maximum is less than the sequence number sign of the sequence number sign minimal data bag of the low dithering cache storage of priority, if then change step s212; Otherwise change step s211.2 grades of dithering caches are not stored packet in the present embodiment, so change step s212.
Step s212,1 grade of dithering cache are when 280ms, and sending sequence number is designated 6 and 7 RTP packet to decoder.
The foregoing description adopts 3 dithering caches to be in parallel, and each dithering cache can be stored 2 packets, therefore can store 6 packets simultaneously, has increased the memory space of dithering cache, has reduced the generation of overflow situation.And during the 280ms, present embodiment replenishes the memory space of 1 grade of dithering cache by moving 2 grades of packets that dithering cache receives, and has reduced the generation of underflow situation at 240ms.In addition, present embodiment does not carry out time compression or time-stretching to packet, can not produce the sound distortion, can not increase total time of delay.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a dithering cache device is characterized in that, comprises a plurality of dithering caches with different priorities,
Described a plurality of dithering cache is in parallel, and is used to store the packet that receives;
After the dithering cache storage that priority is high is full, the described packet that receives is stored into the low dithering cache of priority; The dithering cache that described priority is high is not stored when full, and the next stage dithering cache of the dithering cache that described priority is high moves to the high dithering cache of described priority with the packet of storage;
The dithering cache that priority is the highest also is used to send the packet of being stored.
2. dithering cache device according to claim 1 is characterized in that, the sequence number sign of the packet of the dithering cache storage that priority is high exchanges described packet during greater than the sequence number sign of the packet of the low dithering cache storage of priority.
3. as claim 1 to 2 dithering cache device as described in each, it is characterized in that each dithering cache length is identical.
4. a dithering cache management method is characterized in that, may further comprise the steps:
A plurality of dithering caches receive packet successively according to priority, specifically comprise: the dithering cache that priority is high receives described packet; After the dithering cache storage that described priority is high was full, the dithering cache that priority is low received described packet;
Judge that whether the high dithering cache of priority is stored completely, if storage is full, judges then whether the next stage dithering cache of the dithering cache that described priority is high has available packet; If have, then move described available packet to the high dithering cache of described priority;
The packet that the dithering cache that priority is the highest is stored according to the sequence number sign transmission of packet.
5. as dithering cache management method as described in the claim 4, it is characterized in that described a plurality of dithering caches receive packets and also comprise:
All whether storage is full to judge all dithering caches, if then abandon remaining packet.
6. as dithering cache management method as described in the claim 5, it is characterized in that, before sending packet, also comprise the described packet that receives is sorted, be specially:
Whether the sequence number sign of judging the packet that the sequence number sign of the high dithering cache of priority storage is maximum is less than the sequence number sign of the sequence number sign minimal data bag of the low dithering cache storage of priority; If not, then exchange described packet.
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| CN2006101504491A CN101175104B (en) | 2006-10-31 | 2006-10-31 | Dithering caching device and its management method |
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| CN101175104B true CN101175104B (en) | 2010-04-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5443918B2 (en) | 2009-09-18 | 2014-03-19 | 株式会社ソニー・コンピュータエンタテインメント | Terminal device, audio output method, and information processing system |
| CN103916208B (en) * | 2012-12-31 | 2017-12-29 | 华为技术有限公司 | Key dithering, anti-loss treating method and device |
| JP2016119588A (en) * | 2014-12-22 | 2016-06-30 | アイシン・エィ・ダブリュ株式会社 | Sound information correction system, sound information correction method, and sound information correction program |
| CN105245496B (en) * | 2015-08-26 | 2019-03-12 | 广州市百果园网络科技有限公司 | A kind of method and apparatus of playing audio-fequency data |
| CN105743815B (en) * | 2016-04-06 | 2021-09-10 | 腾讯科技（深圳）有限公司 | Method and apparatus for jitter buffer data processing |
| CN106533976B (en) * | 2016-11-07 | 2019-12-06 | 深圳怡化电脑股份有限公司 | data packet processing method and device |
| CN109062537B (en) * | 2018-08-30 | 2021-07-30 | 倪兴炜 | Audio delay reduction method, device, medium and equipment |
| CN109802949A (en) * | 2018-12-27 | 2019-05-24 | 杭州迅宜通信技术有限公司 | The ultrashort delay speech transmission device of one kind, method, electronic equipment and storage medium |
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| CN1677953A (en) * | 2004-04-02 | 2005-10-05 | 华为技术有限公司 | Method for realizing dynamic jitter buffer adaptive to network peak |
| CN1713613A (en) * | 2004-06-25 | 2005-12-28 | 腾讯科技（深圳）有限公司 | Solution of network shake |
| WO2006046904A1 (en) * | 2004-10-27 | 2006-05-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Terminal having plural playback pointers for jitter buffer |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677953A (en) * | 2004-04-02 | 2005-10-05 | 华为技术有限公司 | Method for realizing dynamic jitter buffer adaptive to network peak |
| CN1713613A (en) * | 2004-06-25 | 2005-12-28 | 腾讯科技（深圳）有限公司 | Solution of network shake |
| WO2006046904A1 (en) * | 2004-10-27 | 2006-05-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Terminal having plural playback pointers for jitter buffer |
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