HUE037155T2 - Késés csökkentése videó telefóniában - Google Patents

Késés csökkentése videó telefóniában

Info

Publication number
HUE037155T2
HUE037155T2 HUE15753528A HUE15753528A HUE037155T2 HU E037155 T2 HUE037155 T2 HU E037155T2 HU E15753528 A HUE15753528 A HU E15753528A HU E15753528 A HUE15753528 A HU E15753528A HU E037155 T2 HUE037155 T2 HU E037155T2
Authority
HU
Hungary
Prior art keywords
video telephony
reducing delay
delay
reducing
telephony
Prior art date
Application number
HUE15753528A
Other languages
English (en)
Inventor
Der Auwera Geert Van
Muhammed Zeyd Coban
Marta Karczewicz
Nikolai Konrad Leung
Original Assignee
Qualcomm Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Publication of HUE037155T2 publication Critical patent/HUE037155T2/hu

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/147—Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0852—Delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0876—Network utilisation, e.g. volume of load or congestion level
    • H04L43/0894—Packet rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/12—Avoiding congestion; Recovering from congestion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2416—Real-time traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
    • H04L47/263—Rate modification at the source after receiving feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/28—Flow control; Congestion control in relation to timing considerations
    • H04L47/283—Flow control; Congestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/40—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2365—Multiplexing of several video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2365—Multiplexing of several video streams
    • H04N21/23655—Statistical multiplexing, e.g. by controlling the encoder to alter its bitrate to optimize the bandwidth utilization
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4347—Demultiplexing of several video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/148—Interfacing a video terminal to a particular transmission medium, e.g. ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/15—Conference systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/15—Conference systems
    • H04N7/152—Multipoint control units therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0852—Delays
    • H04L43/0864—Round trip delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
    • H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/16—Threshold monitoring
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Environmental & Geological Engineering (AREA)
  • Databases & Information Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)
  • Telephonic Communication Services (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
HUE15753528A 2014-07-29 2015-07-29 Késés csökkentése videó telefóniában HUE037155T2 (hu)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201462030513P 2014-07-29 2014-07-29
US14/811,491 US9426418B2 (en) 2014-07-29 2015-07-28 Reducing delay in video telephony

Publications (1)

Publication Number Publication Date
HUE037155T2 true HUE037155T2 (hu) 2018-08-28

Family

ID=55181425

Family Applications (2)

Application Number Title Priority Date Filing Date
HUE15753528A HUE037155T2 (hu) 2014-07-29 2015-07-29 Késés csökkentése videó telefóniában
HUE15748407A HUE043634T2 (hu) 2014-07-29 2015-07-29 Vevõ által kiváltott felkapcsolás videó telefóniában

Family Applications After (1)

Application Number Title Priority Date Filing Date
HUE15748407A HUE043634T2 (hu) 2014-07-29 2015-07-29 Vevõ által kiváltott felkapcsolás videó telefóniában

Country Status (11)

Country Link
US (2) US9426418B2 (hu)
EP (2) EP3175584B1 (hu)
JP (3) JP6602842B2 (hu)
KR (2) KR101727450B1 (hu)
CN (2) CN106576081B (hu)
AU (1) AU2015296540B2 (hu)
BR (2) BR112017001040B1 (hu)
CA (1) CA2953711C (hu)
ES (2) ES2673701T3 (hu)
HU (2) HUE037155T2 (hu)
WO (2) WO2016019019A1 (hu)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2942958B1 (en) * 2013-01-07 2018-03-21 NEC Corporation Coding unit split signaling for pcm coded blocks
US9426418B2 (en) 2014-07-29 2016-08-23 Qualcomm Incorporated Reducing delay in video telephony
US9872201B2 (en) 2015-02-02 2018-01-16 Accelerated Media Technologies, Inc. Systems and methods for electronic news gathering
CN106937073B (zh) * 2015-12-29 2019-10-15 展讯通信（上海）有限公司 基于VoLTE的视频通话码率调整方法、装置及移动终端
US10492085B2 (en) 2016-01-15 2019-11-26 Qualcomm Incorporated Real-time transport protocol congestion control techniques in video telephony
JP6724517B2 (ja) * 2016-04-14 2020-07-15 日本電気株式会社 ビットレート指示装置、ビットレート指示方法、及び、ビットレート指示プログラム
US10321849B2 (en) * 2016-10-13 2019-06-18 Etectrx, Inc. System for ingestion event monitoring and method for detecting ingestion events with high accuracy
CN112913273B (zh) * 2018-11-14 2023-03-31 中兴通讯股份有限公司 用于确定用于非陆地网络的通信参数的系统和方法
CN110351595B (zh) * 2019-07-17 2023-08-18 北京百度网讯科技有限公司 一种缓冲处理方法、装置、设备和计算机存储介质
CN110740284A (zh) * 2019-10-30 2020-01-31 中电福富信息科技有限公司 一种基于网络状况调节手机视频通话动态码率的方法
CN112565224B (zh) * 2020-11-26 2022-08-19 北京经纬恒润科技股份有限公司 一种视频处理方法及装置
US11936698B2 (en) * 2022-01-21 2024-03-19 Verizon Patent And Licensing Inc. Systems and methods for adaptive video conferencing
US20230396357A1 (en) * 2022-06-01 2023-12-07 Qualcomm Incorporated Indication of network condition at a remote ue

Family Cites Families (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5063562A (en) * 1990-05-23 1991-11-05 International Business Machines Corporation Flow control for high speed networks
KR950005150B1 (ko) 1992-03-23 1995-05-18 조명언 휴대용 tv 겸용 영상모니터장치
US6335922B1 (en) 1997-02-11 2002-01-01 Qualcomm Incorporated Method and apparatus for forward link rate scheduling
US6450954B1 (en) 1999-11-01 2002-09-17 New England Medical Center Hospitals, Inc. Method of randomizing patients in a clinical trial
JP2004007361A (ja) * 2001-10-11 2004-01-08 Nippon Telegr & Teleph Corp <Ntt> データ送信制御方法及びこの方法のプログラム並びにこれを用いるデータ送信装置
US7379546B2 (en) 2004-03-03 2008-05-27 King Fahd University Of Petroleum And Minerals Method for XZ-elliptic curve cryptography
US8416694B2 (en) 2004-06-22 2013-04-09 Telefonaktiebolaget Lm Ericsson (Publ) Network feedback method and device
CN101002192A (zh) * 2004-07-27 2007-07-18 索尼株式会社 具有传输差错恢复的家庭网络系统
US8977063B2 (en) * 2005-03-09 2015-03-10 Qualcomm Incorporated Region-of-interest extraction for video telephony
US7701851B2 (en) * 2005-07-20 2010-04-20 Vidyo, Inc. System and method for the control of the transmission rate in packet-based digital communications
GB2430124B (en) * 2005-09-09 2008-01-09 Toshiba Res Europ Ltd Quantum communication system
US8111720B2 (en) * 2007-01-09 2012-02-07 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus to indicate maximum scheduling delay for jitter buffer implementations
US7760642B2 (en) * 2007-03-12 2010-07-20 Citrix Systems, Inc. Systems and methods for providing quality of service precedence in TCP congestion control
US7957307B2 (en) * 2007-03-14 2011-06-07 Microsoft Corporation Reducing effects of packet loss in video transmissions
US20080239953A1 (en) * 2007-03-28 2008-10-02 Honeywell International, Inc. Method and apparatus for minimizing congestion in gateways
US8626896B2 (en) * 2007-12-13 2014-01-07 Dell Products, Lp System and method of managing network connections using a link policy
RU2486699C2 (ru) * 2007-12-20 2013-06-27 Нтт Докомо, Инк. Мобильная станция, базовая станция радиосвязи, способ управления связью и система мобильной связи
US20090305715A1 (en) 2008-06-04 2009-12-10 Motorola, Inc. Channel quality reporting in a wireless communication system
US8325754B2 (en) 2008-10-16 2012-12-04 Soongsil University Research Consortium Techno-Park Method for transmitting network data
CN101582852B (zh) * 2009-06-10 2012-04-11 中兴通讯股份有限公司 一种网络拥塞管理的方法及系统
US8537699B2 (en) * 2009-06-16 2013-09-17 Qualcomm Incorporated Managing video adaptation algorithms
US8199665B2 (en) * 2009-11-30 2012-06-12 Samsung Electronics Co., Ltd Apparatus and method for scheduling service based on network delay
US9276832B2 (en) * 2011-03-20 2016-03-01 King Abdullah University Of Science And Technology Buffer sizing for multi-hop networks
US9119111B2 (en) * 2011-08-12 2015-08-25 Alcatel Lucent Method and apparatus for controlling wireless uplink sessions
US9998400B2 (en) * 2011-09-30 2018-06-12 British Telecommunications Public Limited Company Attribution of congestion contributions
US10292066B2 (en) * 2011-11-04 2019-05-14 Cisco Technology, Inc. System and method of modifying congestion control based on mobile system information
WO2013159209A1 (en) * 2012-04-27 2013-10-31 Magor Communications Corp. Network congestion prediction
US20130332621A1 (en) * 2012-06-08 2013-12-12 Ecole Polytechnique Federale De Lausanne (Epfl) System and method for cooperative data streaming
EP2888842A4 (en) * 2012-08-21 2016-03-09 Hewlett Packard Development Co NOTIFICATION OF CONGESTION IN A NETWORK
US9247448B2 (en) * 2012-08-27 2016-01-26 Qualcomm Incorporated Device and method for adaptive rate multimedia communications on a wireless network
US10375649B2 (en) 2012-09-26 2019-08-06 Lg Electronics Inc. Method and apparatus for controlling transmission power of uplink control channel
TWI474740B (zh) * 2012-12-04 2015-02-21 Univ Nat Taiwan Science Tech 資料叢發排程方法
CN105075202B (zh) * 2013-03-28 2019-07-12 英国电讯有限公司 用于在分组网络中处理分组的方法、节点和分组网络
CN105075323B (zh) * 2013-03-29 2019-02-05 Vid拓展公司 早期分组丢失检测和反馈
US20140376376A1 (en) * 2013-06-20 2014-12-25 Alcatel-Lucent Usa Inc. Method And Apparatus For Improved Multicast Rate Control
US9124520B2 (en) * 2013-08-27 2015-09-01 Cisco Technology, Inc. Reducing buffer bloat while probing for additional bandwidth in an adaptive bitrate network
US9794311B2 (en) * 2014-03-18 2017-10-17 Qualcomm Incorporated Transport accelerator implementing extended transmission control functionality
US9426418B2 (en) * 2014-07-29 2016-08-23 Qualcomm Incorporated Reducing delay in video telephony

Also Published As

Publication number Publication date
JP6420006B2 (ja) 2018-11-07
JP2017531345A (ja) 2017-10-19
US9426418B2 (en) 2016-08-23
JP2017530584A (ja) 2017-10-12
JP6602842B2 (ja) 2019-11-06
EP3175584A1 (en) 2017-06-07
US9438853B2 (en) 2016-09-06
CN106576081A (zh) 2017-04-19
CN106537855B (zh) 2018-05-25
CN106576081B (zh) 2019-08-06
HUE043634T2 (hu) 2019-08-28
ES2739527T3 (es) 2020-01-31
KR20170040216A (ko) 2017-04-12
AU2015296540B2 (en) 2019-09-12
KR101727450B1 (ko) 2017-04-14
CA2953711A1 (en) 2016-02-04
BR112017001510B1 (pt) 2023-10-24
KR102366630B1 (ko) 2022-02-22
WO2016019019A1 (en) 2016-02-04
US20160037125A1 (en) 2016-02-04
CA2953711C (en) 2018-02-27
JP2018139407A (ja) 2018-09-06
ES2673701T3 (es) 2018-06-25
WO2016019015A1 (en) 2016-02-04
AU2015296540A1 (en) 2017-01-19
CN106537855A (zh) 2017-03-22
EP3175583B1 (en) 2019-05-01
BR112017001040A2 (pt) 2017-11-14
US20160037128A1 (en) 2016-02-04
BR112017001040B1 (pt) 2023-11-14
EP3175583A1 (en) 2017-06-07
EP3175584B1 (en) 2018-03-14
KR20170018458A (ko) 2017-02-17
BR112017001510A2 (pt) 2017-11-21

Similar Documents

Publication Publication Date Title
HK1225539A1 (zh) 交互式視頻會議
HUE037155T2 (hu) Késés csökkentése videó telefóniában
GB2546350B (en) Compositions and methods
GB2535253B (en) Compositions and methods
HUE038387T2 (hu) Továbbfutások kódolása palettaalapú videokódolásban
AU358091S (en) Television with sliding speakers
IL251742A0 (en) Caller changes
GB201718876D0 (en) Antithrombin-heparin compositions and methods
GB201617085D0 (en) Compare and delay instructions
IL246879B (en) Preparations of Epilimod and methods of using them
GB201402728D0 (en) Phone
GB2532042B (en) Pure delay estimation
GB201504655D0 (en) Title in German
GB201411802D0 (en) Effervescent compositions
HK1223837A1 (zh) 減少過劑量的組合物和方法
GB201418507D0 (en) Video network
IL249818A0 (en) Video call center
GB201523035D0 (en) In terferometry
GB2522783B (en) Telephony system
GB201512996D0 (en) Compositions and methods
GB201415332D0 (en) Packet delay variation in packet switched network
GB2528589B (en) Telephony system
GB201514413D0 (en) Compositions and methods
HUE045174T2 (hu) Parenterális készítmények és alkalmazásuk
PT3160263T (pt) Composições para prevenção de infeções