EP1519628A2 - Procédé et appareil pour la restitution d'un signal de sortie de mode stéréo qui est obtenu d'un signal d'entrée de mode mono - Google Patents

Procédé et appareil pour la restitution d'un signal de sortie de mode stéréo qui est obtenu d'un signal d'entrée de mode mono Download PDF

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Publication number
EP1519628A2
EP1519628A2 EP04103766A EP04103766A EP1519628A2 EP 1519628 A2 EP1519628 A2 EP 1519628A2 EP 04103766 A EP04103766 A EP 04103766A EP 04103766 A EP04103766 A EP 04103766A EP 1519628 A2 EP1519628 A2 EP 1519628A2
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EP
European Patent Office
Prior art keywords
output signal
signal
data terminal
side data
input signal
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Withdrawn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
EP04103766A
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German (de)
English (en)
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EP1519628A3 (fr
Inventor
Gonzalo Lucioni
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Siemens AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1519628A2 publication Critical patent/EP1519628A2/fr
Publication of EP1519628A3 publication Critical patent/EP1519628A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
    • H04S2420/01—Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]

Definitions

  • the invention relates to a method for reproducing a a monaural input signal generated from a first Output signal and a second output signal existing Binaural output signal and a device for implementation the method according to the preamble of claim 1 or of claim 8.
  • the packet-based communication with the help of VoIP and the associated use of so-called VoIP codecs caused undesirable influences on the voice quality. For example is with medium to high maturity in signal transmission to count, causing audible echoes. additionally just needs to be in a packet-based communication with Discards, whose maturities are often higher and their attenuation are lower than in a natural one Environment is to be found. Therefore, measures are to suppress Provide disturbing echoes, preferably by the use of echo cancellers in the data terminals.
  • Echo canceller are based on common standards, such. ITU-T G.168 (2002), where i.a. Gateway transitions into the classic Telephone network are discussed. For VoIP terminal equipment Alternatively, ITU-T G.165 (1993) can be used, wherein this with respect to echo dispersion and to be achieved suppression set much milder targets than with standards the classical telephony is the case.
  • the invention is therefore based on the object, a method and a device for playing one of a monaural Input signal generated output signal going there educate that the quality of using headphone sets realized monaural VoIP voice connections is improved.
  • the object is achieved by a method in which one generated from a monaural input signal, from a first output signal and a second output signal existing binaural output signal over at least a first and a second speaker of a binaural Headphone set, especially for VoIP applications is reproduced.
  • This turns the monaural input signal by phase shift and / or amplitude amplification the first output signal and / or the second output signal to binaural simulation generated to a listening event to receive a subjectively perceived static and / or represents dynamic positioning of a sound event.
  • a signal processing device generates from the monaural input signal by phase shift and / or Amplitude gain the first output signal and / or the second output signal for binaural simulation to a listening event to receive a subjectively perceived static and / or dynamic positioning of a sound event represents.
  • An essential point of the invention is that due to the binaural simulation is a spatial, largely as a natural hearing despite the use of a headphone is reached.
  • phase, delay, damping and / or HRTF Head Related Transfer Function
  • HRTF Head Related Transfer Function
  • the natural path of sound is simulated, namely the free field, the outer ear and the auditory canal transmission, or because of phase differences, time delays, Level differences and sound differences caused natural Listen.
  • the perception discards, such as discoloration or Echoes to suppress as much as possible, especially the occurrence of Discards are mentally controlled to a certain degree and u. a. depends on experience and attention. This stems in particular from the fact that simultaneously occurring Sound events coming from different sound sources are more easily distinguishable. This will increase the ability the listener improves on a sound source to concentrate and their sound events compared to the To emphasize sound events of the other sources perceptually.
  • the monaural input signal from a transmitter and / or a receiver-side data terminal of the VoIP application is delivered.
  • This has the particular advantage that in addition to the generated by the transmitter-side terminal Sound event also from the receiver-side data terminal generated sound event included in the binaural simulation becomes. Natural hearing also becomes one's own voice audible as a three-dimensional sound event, so that a clear demarcation to another sound source, z. B. to a another speaker, is possible.
  • the static positioning caused by the transmitter-side data terminal Sound event is simulated.
  • This will be the first output signal by a delay of the transmitter-side data terminal supplied input signal generated or a Sign reversal made and this the first speaker fed.
  • the second output signal is generated and this supplied to the second speaker.
  • the static positioning of the transmitter side Data terminal caused sound event "closer" to reached second speaker is advantageously a first component for generating a three-dimensional auditory event implemented.
  • the dynamic Positioning of the transmitter-side data terminal caused Sound event simulated in a second subfunction. This is done first by a mean level comparison between the input signal supplied by the transmitter-side data terminal and the one supplied by the receiver-side data terminal monaural input signal. Subsequently, the supplied by the transmitter-side data terminal input signal delayed to the first output signal via this first delay to create. A second delay of the input signal supplies the second output signal. The first Output signal goes to the first speaker, the second Output signal is supplied to the second speaker. hereby is the dynamic positioning of the transmitter side Data terminal caused sound event "closer" reached the respective speaker, the corresponding Output signal due to a different runtime first reached. Regarding dynamic positioning of sound events is due to the phase shift and the associated different maturities of two output signals advantageously another component for generating a three-dimensional auditory event implemented.
  • a static Positioning of the receiver-side data terminal caused sound event simulated is done.
  • the first output signal arrives then to the second speaker while the second output signal is supplied to the first speaker.
  • the static positioning is thus realized, that caused by the receiver-side data terminal Sound event "closer" appears on the first speaker.
  • the static positioning of the transmitter-side data terminal caused sound event and the static positioning of the receiver side Data terminal simulated sound event simulated simultaneously.
  • This essentially corresponds to a combination the first and the third subfunction.
  • the incoming one Sound of both devices involved in voice transmission terminals is thus perceivable from different directions, including the echo of the receiver-side terminal.
  • an enhancement of the precedence effect of the generated by the receiver-side data terminal sound reached.
  • the so-called echo threshold drawn in accordance with Blauert. See Fig. 3.13 of the ITU-T G.131 for a typical amplification in the terminal. Clear is the "profit" of TELR (Talker Echo Loudness Rating) to recognize.
  • the solution according to the invention provides in another embodiment before, the dynamic positioning of the transmitter side Data terminal caused sound event and that static positioning of the receiver-side data terminal simulated sound event simultaneously.
  • This essentially corresponds to a combination of second and third subfunction.
  • the binaural Headphone set with a signal processing device formed, which has at least one delay element.
  • the runtime element thus generates the one described above Phase shift of the respective output signals.
  • the signal processing device at least one damping element and / or at least one HRTF (Head Related Transfer Function) processing element provide.
  • HRTF Head Related Transfer Function
  • amplitude gains and / or sound differences can be generated.
  • the Combination of elements and in particular with the combination of all elements a realistic three-dimensional listening also when using binaural headphones generated because a natural hearing through time delays, intensity differences and discoloration is characterized.
  • Fig. 1 shows so-called "Talker Echo Tolerance Curves", the regarding the echoes to be found on the voice quality to let.
  • the curves accordingly allow the acceptance assessment the conversation. It is on the abscissa the mean echo transmission time (Mean Echo Transmission Time) T and on the ordinate the Talker Echo Loudness Rating TELR applied.
  • the curve K1 shows the listening threshold (Masked Threshold), the curve K2 shows the Acceptable.
  • the acceptable is equivalent to the curve, in which a disturbing Echo occurs with a probability of 1%.
  • the Curve K3 denotes the limiting case (limiting case), the curve K4, however, the binaural limiting case in an arrangement of stereophonic speakers with an angle of 80 °).
  • Fig. 2 is an embodiment of the invention Device shown as a functional block diagram.
  • the receiver-side data terminal A is ideally equipped with a binaural headphone, in turn, a first speaker L and a second Speaker A has.
  • the signal processing device 1 To control the signal flow accordingly, is located between the respective terminals A, B, a signal processing device 1.
  • the signal processing device 1 three function blocks F1, F2, F3 and a level processing element PVE.
  • the function blocks F1, F2 and F3 each have at least a runtime element (not shown).
  • Alternative or supplementary The function blocks F1, F2 and F3 can also each with at least one damping element and / or a HRTF (Head Related Transfer Function) processing element (not shown).
  • HRTF Head Related Transfer Function
  • function blocks F1 and Function block F2 connected in series, the function block F2 is connected in parallel to function block F1.
  • From the transmitter-side data terminal B is a voice connection constructed to a receiver-side data terminal A, the link being made using a switching network via VoIP is running.
  • the transmitter-side data terminal B transmits a monaural Input signal in a step 100 to the first function block F1. At the same time, the transmitter-side data terminal transmits B the monaural input signal in a step 101 the function block F2 and in a step 102 to the level comparison element PVE.
  • Function block F1 delays the received signal and transmits it in a step 200 to the function block F3. At the same time function block F1 leaves the received signal pass unchanged and transmits the unchanged signal in a step 201 also to the function block F3.
  • the level prediction element PVE receives in one step 102, the signal supplied from the transmitter-side data terminal B. At the same time, there is a signal from the level comparison element PVE receiver-side data terminal A delivered signal that in a step 502.
  • the above described, in function block F2 performed first and second delay supplied by the transmitter-side terminal B Signal then takes place as a function of a mean level comparison the signals supplied by the data terminals A, B.
  • function block F3 are now from the steps 200 and 300 or from the steps 201 and 301 originating signals.
  • function block F3 has one step 501 originating signal of the receiver-side data terminal.
  • the signals originating from steps 200 and 300 can in this embodiment, function block F3 unhindered happen and then in a step 400 the first speaker L supplied.
  • applied to function block F3 Signals can be the last function block F3 without another Editing happen, however, in one step 401 supplied to the second speaker R.
  • Function block F3 delays the transfer in step 501 Signal and this leads to the second speaker R.
  • the signal transmitted in step 501 passes the function block F3 unhindered and is at the first Hand over loudspeaker L. This will, as mentioned above, a static positioning of the receiver side Data terminal A induced sound event "closer" to reached the first speaker L.
  • the receiver-side data terminal A sends in Step 500, a signal without further processing directly to the receiver-side data terminal B.
  • the here proposed splitting of a monaural input signal and its processing for obtaining runtime differences allows three-dimensional listening over a binaural headphone that emulates a natural hearing is. Because natural listening to runtime differences, Level differences and color discoloration of the incoming Sound from different sound sources results, can a three-dimensional hearing ideally be simulated by the fact that both transit time differences as well as level differences and discoloration become.
  • the embodiment described above describes the Function blocks as signal processing blocks whose goal is is, runtime differences and thus phase differences from one to generate monaural input signal by its splitting.
  • it is possible to run through the runtime elements To replace damping elements. This is a spatial hearing imitated, which only has an amplitude gain or damping is realized.
  • HRTF Head Related Transfer Function
  • the function blocks F1 to F3 can also all Record signal processing elements at the same time, so a optimal result regarding the simulation of natural hearing to reach.
  • function blocks F1 and F3 This matches with essentially according to the illustrated embodiment Fig. 2, but without the transmitter-side data terminal B delivered monaural input signal at the function block F2 to provide.
  • the signals then pass through function block F3 with simultaneous processing of the receiver side Data terminal A supplied input signal, to then be supplied to the speaker L and R, respectively.
  • the Combine function blocks F2 and F3 with each other.
  • essentially the already described Fig. 2 basis but excluding function block F1.
  • the delivered from the transmitter-side terminal B monaural input signal is here exclusively Function block F2 or supplied to the level comparison element PVE, to the resulting output signals via to pass the function block F3 to the speakers L and R, respectively.
  • function block F3 takes place according to the subfunction F3, the processing of the monaural input signal of the receiver side Data terminal A.
  • the combination of two functional blocks represents a qualitative high-quality yet cost-effective variant, where the quality of the three-dimensional simulation each with Consideration must be given to the field of application of the headset is.
  • the change of the monaural signal with the help of one of these Processing element also generates a listening event, the at least components of natural hearing reflects.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
EP04103766A 2003-09-29 2004-08-05 Procédé et appareil pour la restitution d'un signal de sortie de mode stéréo qui est obtenu d'un signal d'entrée de mode mono Withdrawn EP1519628A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10345167 2003-09-29
DE10345167 2003-09-29

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EP1519628A2 true EP1519628A2 (fr) 2005-03-30
EP1519628A3 EP1519628A3 (fr) 2009-03-04

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US (1) US7796764B2 (fr)
EP (1) EP1519628A3 (fr)
CN (1) CN100539739C (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070109977A1 (en) * 2005-11-14 2007-05-17 Udar Mittal Method and apparatus for improving listener differentiation of talkers during a conference call
US9794678B2 (en) * 2011-05-13 2017-10-17 Plantronics, Inc. Psycho-acoustic noise suppression
CN102752703A (zh) * 2012-06-28 2012-10-24 深圳Tcl新技术有限公司 单声道输入双声道输出的方法、装置及电视机
CN105469711B (zh) * 2015-12-08 2019-02-05 上海中航光电子有限公司 一种阵列基板及包括该阵列基板的显示面板、显示装置
CN106067990A (zh) * 2016-06-29 2016-11-02 合信息技术（北京）有限公司 音频处理方法、装置以及视频播放器

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US5235646A (en) * 1990-06-15 1993-08-10 Wilde Martin D Method and apparatus for creating de-correlated audio output signals and audio recordings made thereby
WO2002025999A2 (fr) * 2000-09-19 2002-03-28 Central Research Laboratories Limited Procede pour traiter des signaux sonores pour un haut-parleur situe pres de l'oreille de l'auditeur
US6408327B1 (en) * 1998-12-22 2002-06-18 Nortel Networks Limited Synthetic stereo conferencing over LAN/WAN
US20030035553A1 (en) * 2001-08-10 2003-02-20 Frank Baumgarte Backwards-compatible perceptual coding of spatial cues

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US6408327B1 (en) * 1998-12-22 2002-06-18 Nortel Networks Limited Synthetic stereo conferencing over LAN/WAN
WO2002025999A2 (fr) * 2000-09-19 2002-03-28 Central Research Laboratories Limited Procede pour traiter des signaux sonores pour un haut-parleur situe pres de l'oreille de l'auditeur
US20030035553A1 (en) * 2001-08-10 2003-02-20 Frank Baumgarte Backwards-compatible perceptual coding of spatial cues

Also Published As

Publication number Publication date
US7796764B2 (en) 2010-09-14
CN1604689A (zh) 2005-04-06
US20050069140A1 (en) 2005-03-31
EP1519628A3 (fr) 2009-03-04
CN100539739C (zh) 2009-09-09

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