EP0965179A2 - Procede destine a mesurer les effets diaphoniques dans des systemes de telecommunication electriques - Google Patents

Procede destine a mesurer les effets diaphoniques dans des systemes de telecommunication electriques

Info

Publication number
EP0965179A2
EP0965179A2 EP98919038A EP98919038A EP0965179A2 EP 0965179 A2 EP0965179 A2 EP 0965179A2 EP 98919038 A EP98919038 A EP 98919038A EP 98919038 A EP98919038 A EP 98919038A EP 0965179 A2 EP0965179 A2 EP 0965179A2
Authority
EP
European Patent Office
Prior art keywords
signal
original
signals
hands
measuring
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Withdrawn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
EP98919038A
Other languages
German (de)
English (en)
Inventor
Dieter Leckschat
Karl-Heinz Pflaum
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0965179A2 publication Critical patent/EP0965179A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing
    • H04B3/462—Testing group delay or phase shift, e.g. timing jitter

Definitions

  • Hands-free devices in telephones are special transmission links for electrical communication systems having voice transmission, in which the transmission links are mutually influenced by crosstalk.
  • the possibility of "hands-free talking" with a telephone increases the ease of use of a telephone and the quality of a telephone conversation.
  • the hands-free talking enables conversation situations as they occur in the natural conversation between conversation partners and allows a much greater freedom of movement and action of each free speaking participant.
  • the well-known to get in comparison to the overall homely handset-based telecommunications clearly deteriorating meeting and listening conditions in the handle and the other hand to minimize the risk of occurring defects ⁇ Tenden feedback are used voice-activated ⁇ ignal kausmechanismen.
  • the voice-controlled signal processing is performed in free Prechte ⁇ lefonen known, by
  • FIGURE 1 shows a volume V recommendation P.34 according to the ITU document (International Telecommunication Union); Melbourne 1988; Pages 64 to 71, especially chap. 6 constructed measuring arrangement MA for measuring the transmission properties of a hands-free device FSE of a hands-free telephone FST in the conversation situation "two-way talk (double talk)".
  • the hands-free device FSE is connected to a hands-free loudspeaker FL in the direction of transmission (transmission path) via a first amplifier VI (Receiving path)
  • a hands-free microphone FM is connected to the hands-free device FSE via a second amplifier V2.
  • the two-way conversation situation occurring in hands-free mode is achieved by assigning an “artificial ear” KO and an “artificial mouth” KM to the hands-free loudspeaker FL and the hands-free microphone FM to simulate the hands-free conditions.
  • the measuring arrangement also contains a measuring system MS.
  • This measuring system MS supplies the hands-free device FSE for simulating the real hands-free conditions on the one hand via a transmission / reception switch SEW connected upstream of the hands-free device FSE with a "distant" first transmission signal (measurement signal) SS X which reaches the "artificial ear” KO via the hands-free loudspeaker FL and on the other hand via the "artificial mouth” KM and the hands-free microphone FM with a "near" second transmission signal (measurement signal) SS 2 .
  • the signals SSi, SS 2 are preferably selected in the present case so that their properties correspond to those of a natural speech signal (Stw.: Crest factor, envelope, spectral composition, etc.).
  • the measurement of the transmission properties of the hands-free device FSE is carried out in the measuring system MS.
  • the signals SSi, SS 2 transmitted by the measuring system MS are combined with a first reception signal ESi received by the measuring system MS via the “artificial ear” KO and with a second reception signal ES 2 received by the measuring system MS via the transmission / reception switch SEW compared.
  • the known crosstalk phenomenon occurs in the present measuring arrangement by feeding in the signals SSi, SS 2 .
  • This crosstalk is expressed in the fact that a firm with the first transmission ⁇ signal SSI in relationship (for example, properly due to Meßan- and signal propagation characteristics) first over-talk signal ÜSi addition to the second transmission signal SS 2 in the handsfree microphone FM passes and that the second transmission signal SS 2 related (eg due to Measurement arrangement and signal propagation properties) second crosstalk signal ÜS 2 in addition to the first transmission signal SS- * . gets into the "artificial ear" KO.
  • this crosstalk falsifies the measurement of the transmission properties of the hands-free device FSE (undesirable effect).
  • One tries therefore - since the crosstalk in the hands-free mode is inevitable in principle to detect the influences of the crosstalk in order to to be able to take the resulting results into account when setting up the hands-free systems.
  • the transmission properties of the hands-free system FSE can be measured with two monofrequency signals of different frequencies.
  • the object underlying the invention is
  • Measurement signals for measurement systems for measuring the properties of Ubertragungseigen- each other by crosstalk beeinflus ⁇ send transmission paths to produce particular of hands-free so that the measurement of the transmission characteristics is not ver ⁇ is deflected through occurring crosstalk influences.
  • the preservation of the properties mentioned is important in order to determine the dynamic behavior of the transmission links in electrical communication systems, in particular the free lines, which influence one another through crosstalk. to be able to examine speech devices with real speech signals or special test signals.
  • FIGURE 2 shows a flow chart for measuring the transmission properties of hands-free devices
  • FIGURES 3 to 11 show the simulation of the measuring process in the measuring system on the basis of diagrams created with the program "MathCad".
  • FIGURE 2 shows a flow chart for measuring the transmission properties of the hands-free device FSE according to FIGURE 1, as is installed in the measuring system MS according to FIGURE 1 and is used for the measurement.
  • the measuring system MS preferably has generally known means, not shown, such as a microprocessor, data memory, A / D converter, D / A converter and program modules, which are connected to one another for measuring the transmission properties of the hands-free device FSE according to the flow chart are and cooperate accordingly.
  • the number "k” can also be greater than "2". This happens then if - (Emp ⁇ fangsweg that influence each other by crosstalk transmission path and) in contrast to the conditions in speakerphone or with the handsfree device FSE according to FIG 1 - the transmission characteristics of more than two influence each other due to crosstalk Transmission lines are to be measured.
  • the respective length of the original signals US X , US 2 is determined.
  • the number of coefficients or samples of the two original signals USi, US 2 is determined. For example:
  • n 'eNo and m' 2 en n t t ( ( ( ( l l d d ( ( m m a a x x ⁇ ⁇ Vx n + ⁇ , x ⁇ )) +0, 5 k
  • the original signals USi, US 2 are filled with "0" to the unit length "m".
  • a number of “m-Xi” zeros are appended to the first original signal USi immediately after the last sample value or coefficient “a”, while the
  • FIGURE 5 shows the prolonged in this manner origin signal USi ', while FIGURE 6, the extended in this way origin signal US 2 shows
  • the extended original signals USi, US 2 are transformed with the already ⁇ sprochenen Fast Fourier Transformation (FFT) in a known manner in the frequency domain and obtain transformed original signals USi '', US 2 ''.
  • FFT Fast Fourier Transformation
  • FIGURE 7 shows the transformed original signal US / '
  • FIGURE 6 shows the transformed original signal US 2 ''.
  • a sixth method step VS6 individual (certain, predetermined) spectral lines of the transformed original signals US- ', US /' are multiplied by "0" according to a predetermined criterion, while other spectral lines, obeying the same criterion, are multiplied by "1" become.
  • the specification of which spectral lines of the transformed original signals US ', US /' ultimates by "0" and which are multiplied by "1” can be made, for example, by the following alternation rules:
  • the factors b0 ... bx indicate how many spectral lines are multiplied by "0" or "1".
  • the factors can all be the same or different in each case.
  • the block lengths and thus the factors are advantageously chosen so that they adapt to the frequency resolution of the human ear (Bark scale) or are based on the spectral resolution of subband algorithms.
  • the predetermined criterion is that the sum of the 3ewe ⁇ ls "zero" -Multipl ⁇ katoren and "one" -Multiplikatoren with which group the spectral lines of the same frequency or the same frequency are multiplied by ⁇ , equal to "1".
  • FIGURE 9 shows the spectra of the orthogonal signal pair SS /, SS / for a small frequency segment.
  • a final seventh method step VS7 the orthogonal signal pair SS /, SS / shown in the frequency domain is transformed into the time domain.
  • orthogonal measurement signals SS / ', SS /' which, like the measurement signal SSi, SS 2 according to FI-GUR 1, can be used to measure the transmission properties of the hands-free device FSE.
  • the orthogonal measurement signal SS / ' is shown in FIGURE 10
  • FIG. 10 shows that the orthogonal measurement signal SS / 'is the original signal USi with an echo folded outside the original signal USi.
  • the orthogonal measurement signal SS 2 ′′ which is formed from the original signal US 2 with an echo folded outside the original signal US 2 .
  • the generation of the orthogonal measurement signals SS / ', SS /' from the original signals USi, US 2 can also be carried out directly in the time domain, ie without a transformation from the time domain to the frequency domain and a reverse transformation from the frequency domain to the time domain. Process steps VS5 and VS7 are thus omitted.
  • the orthogonal measurement signals SS / ', SS /' are obtained in the following way: 1. Generate a copy of the first original signal US X and the second original signal US 2 .
  • the measurement signals SS / ', SS /' are used when measuring the transmission properties of the hands-free device FSE in the measuring system MS according to FIGURE 1, corresponding reception signals ES / ', ES /' are obtained.
  • These received signals ES / ', ES /' are processed in the measuring system MS in exactly the same way as the original signals USi, US 2 (flow diagram according to FIG. 2). In this way, the signal components caused by the crosstalk can be eliminated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Telephone Function (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

Pour mesurer les propriétés de transmission de lignes de transmission dans des systèmes de télécommunication électriques, notamment des dispositifs mains libres (FSE), sans que cette mesure ne soit faussée par des effets diaphoniques occurrents, des signaux de mesure sensiblement orthogonaux sont produits, dans le domaine temporel ou la plage de fréquence, dans un système de mesure (MS) à partir d'au moins deux signaux vocaux ou signaux d'essai.
EP98919038A 1997-03-06 1998-03-05 Procede destine a mesurer les effets diaphoniques dans des systemes de telecommunication electriques Withdrawn EP0965179A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19709203 1997-03-06
DE19709203A DE19709203C2 (de) 1997-03-06 1997-03-06 Verfahren zum Erzeugen von Meßsignalen für Meßsysteme zum Messen der Übertragungseigenschaften von sich gegenseitig durch Übersprechen beeinflussenden Übertragungsstrecken in elektrischen Nachrichtensystemen, insbesondere von Freisprecheinrichtungen
PCT/DE1998/000659 WO1998039855A2 (fr) 1997-03-06 1998-03-05 Procede destine a mesurer les effets diaphoniques dans des systemes de telecommunication electriques

Publications (1)

Publication Number Publication Date
EP0965179A2 true EP0965179A2 (fr) 1999-12-22

Family

ID=7822463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98919038A Withdrawn EP0965179A2 (fr) 1997-03-06 1998-03-05 Procede destine a mesurer les effets diaphoniques dans des systemes de telecommunication electriques

Country Status (6)

Country Link
US (1) US6611595B1 (fr)
EP (1) EP0965179A2 (fr)
JP (1) JP2001512646A (fr)
CN (1) CN1249878A (fr)
DE (1) DE19709203C2 (fr)
WO (1) WO1998039855A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19919370C2 (de) * 1999-04-28 2003-05-28 Siemens Ag Freisprecheinrichtung und Verfahren zum Betrieb einer solchen
DE19925046A1 (de) * 1999-06-01 2001-05-03 Alcatel Sa Verfahren und Vorrichtung zur Unterdrückung von Rauschen und Echos
US7154845B1 (en) 2002-05-03 2006-12-26 Cisco Technology, Inc. Method and system for measuring crosstalk utilizing a crossbar switch
CN100442724C (zh) * 2005-09-16 2008-12-10 华为技术有限公司 多用户通讯线路串扰测试方法及设备
US7545155B2 (en) * 2007-04-20 2009-06-09 Keithley Instruments, Inc. Parallel AC measurement method
US10326867B2 (en) 2010-02-05 2019-06-18 Nuance Communications, Inc. Measurement and tuning of hands free telephone systems
JP5652223B2 (ja) * 2011-01-24 2015-01-14 株式会社リコー エコーキャンセラ評価装置及びエコーキャンセラ評価方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3414452C1 (de) * 1984-04-17 1985-10-10 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur kompatiblen Übertragung eines Farbfernsehsignals mit Zusatzinformationen
DE4202677C1 (de) * 1992-01-31 1993-09-30 Ita Ingb Testaufgaben Gmbh Vorrichtung zur Überprüfung einer Übertragungsstrecke

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9839855A2 *

Also Published As

Publication number Publication date
JP2001512646A (ja) 2001-08-21
WO1998039855A3 (fr) 1998-12-23
US6611595B1 (en) 2003-08-26
DE19709203A1 (de) 1998-09-24
CN1249878A (zh) 2000-04-05
WO1998039855A2 (fr) 1998-09-11
DE19709203C2 (de) 2000-06-29

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