EP1976332A2 - Procédé et dispositif destinés à transmettre des signaux produits synthétiquement par un système auditif binaural - Google Patents

Procédé et dispositif destinés à transmettre des signaux produits synthétiquement par un système auditif binaural Download PDF

Info

Publication number: EP1976332A2
Authority: EP; European Patent Office
Prior art keywords: signal; hearing; sig1; sig2; hearing aid
Prior art date: 2007-03-29
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.): Granted

Application number

EP08102457A

Other languages

German (de)

English (en)

Other versions

EP1976332A3 (fr

EP1976332B1 (fr

Inventor

Ulrich Dr. Kornagel

Wolfgang Sörgel

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.)

Sivantos GmbH

Original Assignee

Siemens Audiologische Technik GmbH

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.)

2007-03-29

Filing date

2008-03-10

Publication date

2008-10-01

2008-03-10 Application filed by Siemens Audiologische Technik GmbH filed Critical Siemens Audiologische Technik GmbH

2008-10-01 Publication of EP1976332A2 publication Critical patent/EP1976332A2/fr

2015-02-25 Publication of EP1976332A3 publication Critical patent/EP1976332A3/fr

2019-01-02 Application granted granted Critical

2019-01-02 Publication of EP1976332B1 publication Critical patent/EP1976332B1/fr

Status Active legal-status Critical Current

2028-03-10 Anticipated expiration legal-status Critical

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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Electric hearing aids
- H04R25/55—Electric hearing aids using an external connection, either wireless or wired
- H04R25/552—Binaural
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
- H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
- H04S1/005—For headphones
- 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
- H04S2420/05—Application of the precedence or Haas effect, i.e. the effect of first wavefront, in order to improve sound-source localisation

Definitions

the present invention relates to a method for reproducing synthetically generated signals by a binaural hearing system. Moreover, the invention relates to a device for reproducing synthetically generated signals by a binaural hearing system.
synthetically generated signals in this description are to be understood as all signals generated in the hearing system or in a system connected thereto. The term thus includes, inter alia, signals generated by oscillators but also signals which are read from digital memories and subsequently reproduced in analog form.
a hearing aid with two hearing aids (binaural hearing aid, so-called binaural care) is required or useful for the adequate care of a patient with a hearing impairment.
binaural care a hearing aid with two hearing aids
digitally programmable hearing systems are used, ie hearing systems whose electroacoustic properties can be adjusted externally via a computer or computer ("adapted") and must.
the main advantage of (programmable) programmable hearing instruments is that a variety of electro-acoustic parameters can be adjusted to more precisely compensate for hearing loss.
the signal processing can take place in these hearing aids in an analogous manner (digitally programmable analog hearing systems) or in a digital manner (fully digital hearing systems).
Fully digital hearing aids are hearing systems that convert the analog microphone signal into a digital signal.
the digital Signal is then processed according to the commands of the programmed software (algorithm) and on-chip integrated circuits. Finally, the digital signals are converted back to analog signals and forwarded to the listener.
the incoming signal is measured at certain intervals (signal sampling). The more frequent the signal sampling, the better the reproduction of the input signal.
the digitization allows much more complex analysis and filtering with regard to an optimum useful signal / noise ratio than was possible with analog systems.
Wirelessly connected hearing aid systems enable communication between the right and left hearing aids in the case of binaural care.
the implementation of wirelessly received instructions, such as program switching, and in particular the acoustic output is not synchronized in both hearing aids.
a time offset is particularly noticeable in the output of beeps ("Beeps"). If synthetically generated signals are to be output binaurally in such a hearing system, a specific synchronizing behavior of the two devices is therefore necessary in order to avoid disturbing effects for the hearing device system carrier.
the present invention is therefore based on the problem of the synchronization of hearing aids Binaural hearing system in the reproduction of synthetically generated signals with the least possible technical effort and therefore to solve as cost-effective.
This object is achieved by a method and a device for the reproduction of synthetically generated signals by a binaural hearing system according to one of the independent patent claims.
the invention is based on the psychoacoustic knowledge that small time shifts in the reproduction, as they arise in a not quite perfect synchronization, is perceived by the hearing aid wearer an undesirable shift of the virtual switching source in space in the direction of one of the devices. If, on the other hand, the time shift during playback is in a somewhat higher range, then this shift is perceived by the hearing system wearer as a sound expansion (reverberation, reverberation) that is not perceived as disturbing, but which actually enhances the subjective impression of the sound somewhat.
the basic idea of the present invention is therefore based on a waiver of as complete as possible synchronization of the two hearing aids of the binaural hearing system under conscious acceptance of a time shift, which, however, should be such that the result is not perceived by the hearing aid wearer as disturbing.
An inventive binaural hearing system consists of a left hearing aid HG1 and a right hearing aid HG2. Between two hearing aids HG1 or HG2 a preferably low-speed data connection STX for the transmission of control or synchronization signals is present. This data connection normally meets low requirements and typically only intermittent and not necessarily continuous signals are exchanged.
the hearing aid HG1 supplies the left ear LE, whereas the hearing aid HG2 supplies the right ear RE of the hearing system wearer.
a remote control RC is shown, as it is typically used today with wireless binaural hearing systems. there This remote control can communicate with both hearing aids or even with only one hearing aid (CS1, CS2).
acoustic signals SIG1 and SIG2 are to be output to the hearing system wearer by the hearing aids of the binaural hearing system.
Such a situation may e.g. present when the hearing aid user wants to put the hearing aids via the remote control RC in a (different) operating state and this change is now reported back to the hearing aid user.
Other automatically generated signals may e.g. be issued during a program switching, or one for reporting status information of the system to the hearing aid users, etc.
the signals to be output here are typically generated synthetically. For playback, these digital signals - usually after previous digital-to-analog conversion - output on the speaker of the respective hearing aid.
the signaling is triggered by one of the two hearing aids connected to a hearing system.
the reproduction should be such that it is binaurally perceived as a uniform event.
a transmission of the trigger pulse between the two devices is necessary.
This transmission typically takes place by electromagnetic or magnetic-inductive means of digital transmission.
all known single and multicarrier methods such as BPSK, QPSK, QAM, OFDM, etc. as well as time or frequency division multiplexing (TDMA, CDMA, etc.
TDMA time or frequency division multiplexing
channel coding methods are used for error detection and error correction, which requires decoding at the receiver.
a packet-wise multiplexed transmission of various data is often provided, which is a necessity of buffers leads. This results in a total that a transmission can not be instantaneous, but with a certain time delay, which can be roughly estimated at least on the sending side but in sum can not always be determined exactly.
both devices HG1 or HG2 would be exactly synchronized. Then the signals could be delivered exactly synchronously and thus - as actually desired - be perceived in the middle.
a suitable method was in the EP 1 750 482 A2 described. Practically, however, an exact synchronization means an increased amount of hardware and energy, which should be saved.
a perfect synchronization is deliberately dispensed with; instead, after a first signal SIG1 has been reproduced by the first hearing device HG1, the reproduction of a second signal SIG2 by the second hearing device HG2 is additionally delayed by a defined second time interval DT2.
the order of the hearing aids can also be reversed. It is meant by the term “additionally delayed” that in addition to the delays inevitably occurring due to the transmission methods described above, a further deliberate delay is made. This further deliberate delay is referred to below as DT2.
the hearing aid HG1 which is assigned to the left ear LE of the hearing system wearer, is operated as a "master", whereas the hearing aid HG2, which is assigned to the right ear RE, reacts as a "slave".
the remote control RC sends a signal CS1 to the hearing aid HG1, whereupon the hearing aid HG1 outputs the signal SIG1 to the left ear LE after a time interval t1.
the size of the time interval t1 is essentially by the time required for the signal processing in the hearing aid HG1 conditional.
the hearing aid HG1 sends a signal STX to the hearing aid HG2.
the hearing aid HG2 then sends with a time delay t3 a corresponding signal to the device E, which measures the additional time delay DT2 according to its purpose and causes. After expiration of this time interval DT2, the device E transmits a corresponding signal back to the hearing aid HG2, which then outputs the signal SIG2 to the right ear RE after a further time interval t4 has elapsed.
FIG. 2 schematically illustrated embodiment of the process, it makes sense if the device E is housed for the design and generation of the time delay DT2 in the hearing aid HG2.
the device E for measuring the time delay DT2 is housed in the hearing aid HG1.
the remote control sends a signal CS1 to the hearing aid HG1, which, after a time interval t1 has elapsed, sends a signal s11 to the device E which calculates the appropriate magnitude of the time delay DT2.
the device E transmits the result in the form of the signal s12 back to the hearing aid HG1, which then after expiration of a Interval t3 the signal SIG1 outputs to the left ear LE.
the hearing aid HG1 After expiration of the time interval DT2 measured from the time of reception of the signal s12, the hearing aid HG1 transmits the signal STX to the hearing aid HG2, which then outputs the signal SIG2 to the right ear after the expiration of the time interval t4.
Such a desirable sound change arises as psychoacoustic experiments show in this context when the second time delay DT2 is in the range of about 1 ms to about 50 ms. Selecting the time delay DT2 in this range generally ensures that the perception of the hearing aid wearer will not result in either an undesirable spatial characteristic of the virtual switching source, or a complete disintegration of the signals to be reproduced into two separate signals. If, however, the delay between the two devices is too large, the impression of a uniform hearing event is lost. An echo is created; the stereo signal thus decays into two individually perceptible mono signals.
the second time delay DT2 should advantageously range between about 4 ms to about 20 ms.
Optimal audio impressions result when the second time delay DT2 is in the range of about 5 ms to about 15 ms.
the auditory impression ultimately depends on the total time delay between the reproduction of the signals SIG1 or SIG2 to the ears LE or RE.
the response times and transmission times t1, t2, t3 or t4 are much smaller than the time delay DT2
the influence of these additional times can be neglected.
the influence of these transmission and response times on the total time delay must be taken into account accordingly when dimensioning the additional time delay DT2.
the stated time scales are therefore based on the total time delay and not on the time interval DT2 alone. In the normal case, however, the influence of the times t1, t2, t3 and t4 should be so small that they can be neglected compared to the time delay DT2.
the maximum transmission time must not be greater than the upper limit of the preferred range for the effective time delay between the outputs of the signals SIG1 and SIG2.
a delay in the hearing aid HG1 may be provided instead of the delay in the hearing aid HG2. This can be done, for example, in the FIG. 4 shown situation by appropriate dimensioning of the time interval DT1 done, which - depending on the variant - DT1 may be smaller than, equal to or greater than DT2.
the present invention is advantageously realized with a device E for reproducing synthetically generated signals in a binaural hearing system, which is suitable for the purpose Dimensioning and possibly generation of the time delay DT2 ensures.
the time delay DT2 should be measured so that the hearing aid wearer gets the impression of a sound expansion. This is generally achieved by setting the time delay DT2 such that the total time delay between the playback of the signals SIG1 and SIG2 is within the psychoacoustically useful time ranges.

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Engineering & Computer Science (AREA)
Computer Networks & Wireless Communication (AREA)
Health & Medical Sciences (AREA)
General Health & Medical Sciences (AREA)
Neurosurgery (AREA)
Otolaryngology (AREA)
Physics & Mathematics (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)
Stereophonic System (AREA)

EP08102457.2A 2007-03-29 2008-03-10 Procédé et dispositif pour la reproduction de signaux synthétiques générés par un système auditif binaural Active EP1976332B1 (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE102007015223A DE102007015223B4 (de)	2007-03-29	2007-03-29	Verfahren und Einrichtung zur Wiedergabe synthetisch erzeugter Signale durch ein binaurales Hörsystem

Publications (3)

Publication Number	Publication Date
EP1976332A2 true EP1976332A2 (fr)	2008-10-01
EP1976332A3 EP1976332A3 (fr)	2015-02-25
EP1976332B1 EP1976332B1 (fr)	2019-01-02

Family

ID=39569215

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP08102457.2A Active EP1976332B1 (fr)	2007-03-29	2008-03-10	Procédé et dispositif pour la reproduction de signaux synthétiques générés par un système auditif binaural

Country Status (4)

Country	Link
US (1)	US10104480B2 (fr)
EP (1)	EP1976332B1 (fr)
DE (1)	DE102007015223B4 (fr)
DK (1)	DK1976332T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DK2190216T3 (da) *	2008-11-20	2011-11-14	Oticon As	Binauralt høreinstrument
WO2011111304A1 (fr) *	2010-03-08	2011-09-15	パナソニック株式会社	Prothèse auditive
EP2885925B1 (fr) *	2012-09-28	2019-04-10	Siemens Ltd. China	Système de prothèse auditive dynamique et procédé permettant de configurer le système de prothèse auditive

Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP1750482A2 (fr)	2005-08-04	2007-02-07	Siemens Audiologische Technik GmbH	Procédé pour la synchronisation de signaux audio et appareil auditif correspondant

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DE2817777C2 (de) *	1977-04-25	1986-08-14	Victor Company Of Japan, Ltd., Yokohama, Kanagawa	Signalverarbeitungsschaltung zur Umwandlung eines monauralen Eingangssignals in binaurale Signale
DE3112874C2 (de) *	1980-05-09	1983-12-15	Peter Michael Dipl.-Ing. 8000 München Pfleiderer	Verfahren zur Signalaufbereitung für die Wiedergabe einer Tonaufnahme über Kopfhörer und Vorrichtung zur Durchführung des Verfahrens
US5014319A (en) *	1988-02-15	1991-05-07	Avr Communications Ltd.	Frequency transposing hearing aid
AT394650B (de)	1988-10-24	1992-05-25	Akg Akustische Kino Geraete	Elektroakustische anordnung zur wiedergabe stereophoner binauraler audiosignale ueber kopfhoerer
JP4939722B2 (ja) *	2000-07-14	2012-05-30	ジーエヌリザウンドエー／エス	同期式ステレオ聴覚システム
CA2452945C (fr) *	2003-09-23	2016-05-10	Mcmaster University	Dispositif auditif binaural adaptatif
KR100677119B1 (ko) *	2004-06-04	2007-02-02	삼성전자주식회사	와이드 스테레오 재생 방법 및 그 장치
DK1651005T3 (en) *	2005-12-19	2017-07-10	Sonova Ag	Synchronization of sound generated in binaural hearing aid system

2007
- 2007-03-29 DE DE102007015223A patent/DE102007015223B4/de not_active Expired - Fee Related
2008
- 2008-03-10 EP EP08102457.2A patent/EP1976332B1/fr active Active
- 2008-03-10 DK DK08102457.2T patent/DK1976332T3/da active
- 2008-03-25 US US12/079,143 patent/US10104480B2/en active Active

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP1750482A2 (fr)	2005-08-04	2007-02-07	Siemens Audiologische Technik GmbH	Procédé pour la synchronisation de signaux audio et appareil auditif correspondant

Non-Patent Citations (5)

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Title
JENS BLAUERT ET AL.: "Binaural and Spatial Hearing in Real and Virtual Environments", AN INTRODUCTION TO BINAURAL TECHNOLOGY, 1996, pages 593 - 609
JENS BLAUERT: "Communication Acoustics", 2005, SPRINGER
JENS BLAUERT: "Spatial Hearing. The Psychophysics of Human Sound Localization", 1983, THE MIT PRESS
NACHSCHRIFT, NEUE ERGEBNISSE UND TRENDS, 1972
NACHSCHRIFT, NEUE ERGEBNISSE UND TRENDS, 1982

Also Published As

Publication number	Publication date
DK1976332T3 (da)	2019-04-08
DE102007015223A1 (de)	2008-10-02
US20080240449A1 (en)	2008-10-02
DE102007015223B4 (de)	2013-08-22
EP1976332A3 (fr)	2015-02-25
EP1976332B1 (fr)	2019-01-02
US10104480B2 (en)	2018-10-16

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