EP1179819A1 - Transmission efficace d'un bruit de confort - Google Patents

Transmission efficace d'un bruit de confort Download PDF

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Publication number
EP1179819A1
EP1179819A1 EP01301443A EP01301443A EP1179819A1 EP 1179819 A1 EP1179819 A1 EP 1179819A1 EP 01301443 A EP01301443 A EP 01301443A EP 01301443 A EP01301443 A EP 01301443A EP 1179819 A1 EP1179819 A1 EP 1179819A1
Authority
EP
European Patent Office
Prior art keywords
comfort noise
message
communication system
system element
base station
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP01301443A
Other languages
German (de)
English (en)
Inventor
Terry Si-Fong Cheng
Ching Yao Huang
Frances Jiang
Steve Mykola Kuzyszyn
Yang Yang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia of America Corp
Original Assignee
Lucent Technologies 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 Lucent Technologies Inc filed Critical Lucent Technologies Inc
Publication of EP1179819A1 publication Critical patent/EP1179819A1/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/012—Comfort noise or silence coding

Definitions

  • the present invention relates to communications; more specifically, wireless communications.
  • FIG. 1 illustrates a prior art communication system.
  • Mobile communication system element 10 communicates over an air link to base station communication system element 12.
  • Base station communication system element 12 then communicates over communication link 14 to mobile switching center (MSC) communication system element 16.
  • MSC 16 Communications from MSC 16 are then passed over a communication link such as link 18 to public switched telephone network (PSTN) communication system element 20 or, for example, another MSC.
  • PSTN public switched telephone network
  • PSTN public switched telephone network
  • PSTN public switched telephone network
  • Comfort noise is simply a static-like sound that allows a user to hear something indicating that the communication link is still active during periods of silence in a conversation.
  • MSC 16 injects comfort noise into communication path 40 which passes the comfort noise over communication paths 42, 44 and 46 to mobile 10.
  • Link 14 between base station 12 and MSC 16 is typically leased by a wireless communication service provider and is a significant portion of the cost of operating a wireless communication system.
  • the present invention provides a more efficient use of communication links between elements of a communication system.
  • the links are used more efficiently by sending messages instructing an element to generate comfort noise rather than sending messages containing comfort noise.
  • a message instructing an element to generate comfort noise is smaller than a message containing comfort noise.
  • the bandwidth of links between communication system elements is used more efficiently by sending messages or commands to generate comfort noise rather than a message containing comfort noise.
  • FIG. 2 illustrates a communication system embodying the present invention.
  • Mobile communication system element 50 communicates with base station communication system element 52 using an air link comprising upward path 54 and downward path 56. Communications from mobile 50 pass through base station 52 over paths 58 and 60, and are passed to and from MSC communication system element 62 over communication paths 64 and 66 of link 68. Communications to and from mobile 50 then pass from MSC 62 to public switched telephone network communication system element 70 and destination communication system element 72 through communication link 74.
  • mobile 50 When a user of mobile 50 is not speaking or there is near silence, mobile 50 generates a message containing comfort noise which is transmitted over upward path 54 to base station 52.
  • Base station 52 detects the comfort noise in communication path 58 and replaces the message containing comfort noise with a message instructing the next communication system element, which in this case is MSC 62, to generate comfort noise.
  • MSC 62 This is illustrated in FIG. 2 where communication path 58 consists of inward section 90 which carries messages containing comfort noise and outward section 92 which carries comfort noise generation messages instructing MSC 92 to generate a message containing comfort noise.
  • the comfort noise generation message is passed over communication path 64 of link 68 to MSC 62.
  • Inward section 110 of communication path 112 of MSC 62 carries the comfort noise generation messages.
  • MSC 62 In response to receiving the comfort noise generation message, MSC 62 generates a comfort noise message containing comfort noise and passes it along section 114 of communication path 112 and then across link 74 and eventually to destination
  • MSC 62 when a user at destination 72 does not speak, a period of silence is detected by MSC 62 by examining the data in a message or packet received along inward section 116 of communication path 118. In response to detecting a period of silence or near silence, MSC 62 creates a comfort noise generation message that instructs a receiving communication system element, which in this case is base station 52, to generate a comfort noise message containing comfort noise. MSC 62 sends the comfort noise generation message along outward section 120 of communication path 118 and over communication path 66 of link 68 to base station 52. Base station 52 then receives the comfort noise generation message on inward section 106 of communication path 60. In response to receiving the message, base station 52 generates a comfort noise message containing comfort noise which is sent along outward section 108 of communication path 60 and then over downward path 56 to mobile 50.
  • a comfort noise generation message that instructs a receiving communication system element, which in this case is base station 52, to generate a comfort noise message containing comfort noise.
  • FIG. 3 illustrates a typical format for messages passed over communication paths 64 and 66 of link 68.
  • Message 90 comprises header section 92 and body 94.
  • body section 94 varies in size.
  • body section 94 is equal in size to header section 92.
  • 50% of the message space is used to convey comfort noise.
  • the message can be shortened by removing the comfort noise and sending a command or indication to produce comfort noise. For example, 50% of the message can be eliminated by dropping message body 94 and sending header 92 without a body section.
  • a communication element receiving a header without a body will then respond to a message in that format as a command to generate a message containing comfort noise. It is also possible to send a message 90 without body 94 with a specific bit pattern set within header 92 to indicate that comfort noise should be generated. Other types of messages may be used, but in order to obtain improved efficiency, the overall message should be shorter than a full message containing comfort noise.
  • FIG. 4 illustrates a simplified block diagram of base station 52.
  • Base station 52 sends and receives signals on antenna 121. Signals to and from antenna 121 are passed through modulator/demodulator 122 and then through multiplexer/demultiplexer 124 which supplies signals to and receives signals from processors 126 and 128.
  • a processor is provided for each communication channel handled by the base station. To simplify the figure, only two processors are shown.
  • a processor such as processor 126, receives messages that were transmitted by mobile 50 and received via modulator/demodulator 122 and multiplexer/demultiplexer 124. Processor 126 performs functions such as encryption and decryption, encoding and error correction. In addition to these functions, processor 126 determines whether message body 94 contains comfort noise.
  • processor 126 In response to receiving a message containing comfort noise, processor 126 outputs a comfort noise generation message instructing a receiving communication system element to generate a comfort noise message containing comfort noise. In this example, processor 126 outputs header 92 without body 94, and passes it to multiplexer/demultiplexer 130. Multiplexer/demultiplexer 130 then passes the message through communication link 68 to MSC communication system element 62.
  • FIG. 5 illustrates a simplified block diagram of MSC 62.
  • a comfort noise generation message is received over link 68 by multiplexer/demultiplexer 150.
  • Multiplexer/demultiplexer 150 then provides an output to vocoders or processors 152 through 154.
  • a vocoder/processor is typically assigned to each communication channel or mobile user being serviced by MSC 62.
  • Vocoder/ processors 152 through 154 are typically used to encode and decode speech to minimize the amount of data required to represent the speech. In order to simplify the diagram, only two vocoder/processors are shown.
  • vocoder/processor 152 When vocoder/processor 152 receives a comfort noise generation message commanding the generation of a message containing comfort noise, vocoder/processor 152 sends a comfort noise message or packet containing comfort noise to switch 160. Switch 160 then passes the message or packet containing comfort noise to PSTN 70 for eventual delivery to destination communication system element 72.
  • vocoder/processor 152 When a period of silence or near silence is detected on a message or packet coming from PSTN 70 to vocoder/processor 152 via switch 160, vocoder/processor 152 generates a comfort noise generation message instructing a receiving communication element to generate a message containing comfort noise.
  • Vocoder/processor 152 detects periods of silence or near silence, for example, by detecting a message or packet with data representing voice or sound where the amplitude associated with that voice or sound is below a threshold. The threshold may be, for example, 5% of the maximum available amplitude associated with the data representing the voice or sound.
  • the comfort noise generation message is then passed through multiplexer/demultiplexer 150 and over link 68 to multiplexer/demultiplexer 130 of base station 52.
  • the comfort noise generation message is then received by vocoder/processor 126 which in response to the comfort noise generation message generates a comfort noise message containing comfort noise.
  • the message containing comfort noise is then passed through multiplexer/demultiplexer 124 and modulator/demodulator 122 for transmission over antenna 121 to mobile 50.

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  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)
  • Communication Control (AREA)
EP01301443A 2000-08-11 2001-02-19 Transmission efficace d'un bruit de confort Withdrawn EP1179819A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US63573900A 2000-08-11 2000-08-11
US635739 2000-08-11

Publications (1)

Publication Number Publication Date
EP1179819A1 true EP1179819A1 (fr) 2002-02-13

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EP01301443A Withdrawn EP1179819A1 (fr) 2000-08-11 2001-02-19 Transmission efficace d'un bruit de confort

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EP (1) EP1179819A1 (fr)
JP (1) JP2002141864A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100558074C (zh) * 2003-12-09 2009-11-04 国际商业机器公司 使白噪声数据分组对信道利用率影响最小的系统及方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5475712A (en) * 1993-12-10 1995-12-12 Kokusai Electric Co. Ltd. Voice coding communication system and apparatus therefor
US5812965A (en) * 1995-10-13 1998-09-22 France Telecom Process and device for creating comfort noise in a digital speech transmission system
EP0868037A1 (fr) * 1997-03-21 1998-09-30 Lucent Technologies Inc. Système AMRT à transmission discontinue
GB2332347A (en) * 1997-12-13 1999-06-16 Motorola Ltd Digital communications device, method and systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5475712A (en) * 1993-12-10 1995-12-12 Kokusai Electric Co. Ltd. Voice coding communication system and apparatus therefor
US5812965A (en) * 1995-10-13 1998-09-22 France Telecom Process and device for creating comfort noise in a digital speech transmission system
EP0868037A1 (fr) * 1997-03-21 1998-09-30 Lucent Technologies Inc. Système AMRT à transmission discontinue
GB2332347A (en) * 1997-12-13 1999-06-16 Motorola Ltd Digital communications device, method and systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100558074C (zh) * 2003-12-09 2009-11-04 国际商业机器公司 使白噪声数据分组对信道利用率影响最小的系统及方法

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