EP1151593A1 - Handset for telephone technology - Google Patents

Handset for telephone technology

Info

Publication number
EP1151593A1
EP1151593A1 EP00910534A EP00910534A EP1151593A1 EP 1151593 A1 EP1151593 A1 EP 1151593A1 EP 00910534 A EP00910534 A EP 00910534A EP 00910534 A EP00910534 A EP 00910534A EP 1151593 A1 EP1151593 A1 EP 1151593A1
Authority
EP
European Patent Office
Prior art keywords
handset
microphone
directional characteristic
sound
opening
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Withdrawn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
EP00910534A
Other languages
German (de)
French (fr)
Inventor
Holger Petersen
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 EP1151593A1 publication Critical patent/EP1151593A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • H04M1/035—Improving the acoustic characteristics by means of constructional features of the housing, e.g. ribs, walls, resonating chambers or cavities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/20—Arrangements for preventing acoustic feed-back

Definitions

  • the present invention relates to a handset for telephony with a built-in earpiece and a built-in microphone.
  • a telephone device For perfect communication between two telephone partners, it is important that a telephone device reflects as little as possible of an incoming signal. Reflections arise not only in the area of the telephone circuit, but also in the area of the handset. In particular, the acoustic signal from the earpiece is received by the speech capsule and transmitted back to the telephone line. The phone user then has the impression of reflections, brightness and echoes.
  • the reason for this is, among other things, a low acoustic attenuation between the earpiece and the microphone in handsets due to sound radiation in the inside of the handset (feedback).
  • the object of the present invention is to provide a handset of the type mentioned at the outset which, even after miniaturization, is distinguished by good acoustic damping between the horn capsule and the microphone, and in the microphone signal offers a favorable relationship between the speech signal and environmental noise.
  • the microphone is a pressure gradient receiver designed with a unidirectional directional characteristic, which is arranged on the front of the handset in such a way that the opening of the microphone ends at the level of the front of the handset and the rear compensation opening of the microphone ends in the area of the underside of the handset.
  • the sound is suppressed by the horn capsule, with no costs for a complex mechanical construction or for digital signal processing. Furthermore, the sound from the inside of the handset, which escapes through housing leaks, is also suppressed.
  • the directional characteristic of the unidirectional microphone also suppresses the ambient noise from the surroundings.
  • Another advantage of the handset according to the invention is that by turning the microphone capsule, the thickness dimension of the microphone instead of the diameter is decisive for the installation length in the handset. Since the thickness of the microphone capsule ⁇ m typically only amounts to less than 50% of the diameter, the handset can be formed short.
  • FIG. 1A schematically shows an exemplary embodiment of a handset according to the invention
  • FIG. 1B schematically shows the directional characteristic of the microphone in the handset shown in FIG. 1,
  • FIG. 2B schematically shows the directional characteristic of the microphone in the handset shown in FIG. 1,
  • FIG. 3A schematically shows another known handset
  • FIG. 3B schematically shows the directional characteristic of the microphone in the handset shown in FIG. 1,
  • FIGS. 2A to 3B represent known handsets.
  • Figure 2A shows a handset with a known omnidirectional, omnidirectional microphone that does not have a preferred sound entry direction. The sound is therefore picked up from all directions with the same volume, including from the underside of the handset. Except for slight shadowing effects due to the dimensions of the horn capsule, the handset applies to almost the entire frequency band of the telephone.
  • FIG. 2A shows a handset 7 of long construction with an omnidirectionally directed microphone 8 and a horn capsule 5.
  • FIG. 2A shows how this situation is presented in a standard handset constructed in this way.
  • a double case shows m from the underside of the phone towards the mouth.
  • the length of this arrow describes the sensitivity of the microphone arrangement in this direction.
  • the area of the directional characteristic spanned by the closed line in FIG. 2B describes the sensitivity of the microphone to ambient sound.
  • the individual trap shown therein indicates the sensitivity to the microphone towards the horn capsule and the sound emitted from the handset due to housing leaks.
  • the area spanned by these arrows is a measure of the sensitivity of the microphone to sound from the handset.
  • FIG. 3A shows a known handset with a unidirectionally oriented directional microphone, which has a sound emission opening on the top of the handset and a rear compensation opening on the front of the handset.
  • the spanned area of the directional characteristic is significantly smaller and thus less ambient sound is recorded. Almost no sound is recorded from certain directions.
  • FIG. 1A shows a handset 1 according to the present invention.
  • This handset has a unidirectionally directed microphone 2 with a main sound opening 3 and a rear compensation opening 4, as well as a receiver 5. Due to the changed arrangement of the directional microphone 2 in the handset 1 according to the invention For example, a directional characteristic can be generated which, in the case of miniaturized handsets, is aimed at the user's mouth and at the same time has a minimum sensitivity in the direction of the receiver 5.
  • this arrangement is particularly suitable for short handsets, since the microphone is located behind the mouth or above the mouth.
  • FIGS. 2A and 3A shows that with the same signal sensitivity towards the mouth, the sound from the direction of the earphone is suppressed significantly better.
  • the entire spanned area is similar to the directional characteristic in the arrangement of FIG. 2 and FIG. 1, so that the ambient sound is also suppressed comparatively well.
  • the directional characteristic of the unidirectional microphone also suppresses ambient noise.
  • the result is a signal-to-noise ratio as in the case of a microphone arrangement with a 0.7 to 0.5 times the mouth-microphone distance without post-processing for noise reduction.
  • the thickness of the microphone determines the installation length in the handset. Since the thickness of the microphone is usually less than 50% of the microphone diameter, the handset can be shortened considerably.
  • the unidirectional directional characteristic can be influenced by the targeted use of protective tiles.
  • protective flow is applied to the capsule or the sound inlet in the handset, the selection of the flow taking into account its acoustic impedance enables the use of bidirectional microphone capsules. These are generally simpler, smaller and less expensive than microphone capsules with unidirectional characteristics.
  • the directional characteristic and the frequency response of the microphone unit can be changed, stabilized and adapted by small changes in the flow material.

Abstract

In order to improve the directional characteristic of miniaturized handsets, the microphone (2) is configured with a pressure gradient receiver having a unidirectional pick-up characteristic, said receiver being disposed on the front side of the handset (1) so that the inlet (3) of the microphone (2) ends in the plane of the front side of the handset (1) and the back compensation opening (4) of the microphone (2) ends in the area of the bottom side of the handset (1).

Description

Beschreibungdescription
Handapparat für die FernsprechtechnikHandset for telephony
Die vorliegende Erfindung betrifft einen Handapparat für die Fernsprechtechnik mit eingebauter Hörkapsel und eingebautem Mikrofon.The present invention relates to a handset for telephony with a built-in earpiece and a built-in microphone.
Für eine einwandfreie Kommunikation zwischen zwei Telefon- partnern ist es wichtig, daß ein Fernsprechgerät möglichst wenig von einem ankommenden Signal reflektiert. Reflektionen entstehen nicht nur im Bereich der Fernsprechgeräteschaltung, sondern auch im Bereich des Handapparates. Insbesondere wird von der Sprechkapsel das akustische Signal der Hörkapsel emp- fangen und wieder auf die Fernsprechleitung übertragen. Der Telefonbenutzer hat dann den Eindruck von Reflexionen, Helligkeit und Echos.For perfect communication between two telephone partners, it is important that a telephone device reflects as little as possible of an incoming signal. Reflections arise not only in the area of the telephone circuit, but also in the area of the handset. In particular, the acoustic signal from the earpiece is received by the speech capsule and transmitted back to the telephone line. The phone user then has the impression of reflections, brightness and echoes.
Der Grund dafür ist unter anderem eine geringe akustische Dämpfung zwischen Hörkapsel und Mikrofon bei Handapparaten aufgrund von Schallabstrahlung in der Hörerinnenseite (Rückkopplung) .The reason for this is, among other things, a low acoustic attenuation between the earpiece and the microphone in handsets due to sound radiation in the inside of the handset (feedback).
Ein weiterer Nachteil besteht darin, daß insbesondere schnur- lose Telefone und Mobiltelefone, welche mehr oder weniger lediglich aus einem Handapparat bestehen, heute derart stark miniaturisiert sind, daß Probleme bei der Abstrahlung tiefer Frequenzen unter 1 kHz auftreten. Dies wird zusätzlich durch ein unergono isches Design verstärkt, bei dem im praktischen Gebrauch ein Luftspalt zwischen Hörmuschel und Ohr auftritt.Another disadvantage is that especially cordless telephones and mobile telephones, which more or less consist of only one handset, are so miniaturized today that problems with the emission of low frequencies below 1 kHz occur. This is further reinforced by an non-ergonomic design, which creates an air gap between the earpiece and ear in practical use.
Weiterhin besteht bei der Miniaturisierung von Handapparaten ein ungünstiges Verhältnis zwischen Sprachsignal und Umweltgeräuschen im Mikrofonsignal. Insbesondere bei kurzen Handap- paraten, wie z.B. schnurlosen Telefonen bzw. Mobiltelefonen, besteht eine große Entfernung zwischen Mikrofon und Mund (das Mikrofon ist m Richtung Ohr verschoben) , so daß starke U - weltgerausche den Sprachschall des Benutzers überdecken.Furthermore, in the miniaturization of handsets, there is an unfavorable relationship between the speech signal and environmental noise in the microphone signal. Especially in the case of short handsets, such as cordless telephones or cell phones, there is a large distance between the microphone and mouth (this The microphone is moved in the direction of the ear), so that strong environmental noise covers the user 's speech sound.
Diese Nachteile versucht man durch lange Gerate mit großem Abstand zwischen Horkapsel und Mikrofon, durch große flache Hörmuscheln, die mit dem Ohr bei der Benutzung weitgehendst abgedeckt werden, durch eine geringe Horkapsellautstarke, bzw. durch Echokompensationsverfahren mit Audiosignalverar- beitung zu vermeiden.These disadvantages are attempted to be avoided by long devices with a large distance between the horn capsule and the microphone, by large flat earpieces that are largely covered with the ear when in use, by a low horn capsule volume, or by echo compensation methods with audio signal processing.
Aufgabe der vorliegenden Erfindung ist es einen Handapparat der eingangs genannten Art anzugeben, der sich auch nach einer Miniaturisierung durch eine gute akkustische Dampfung zwischen Horkapsel und Mikrofon auszeichnet und im Mikrofon- signal ein gunstiges Verhältnis zwischen Sprachsignal und U - weltgerauschen bietet.The object of the present invention is to provide a handset of the type mentioned at the outset which, even after miniaturization, is distinguished by good acoustic damping between the horn capsule and the microphone, and in the microphone signal offers a favorable relationship between the speech signal and environmental noise.
Diese Aufgabe wird bei der eingangs genannten Anordnung dadurch gelost, daß das Mikrofon ein mit einer unidirektionalen Richtcharakteristik ausgebildeter Druckgradientenempfanger ist, der auf der Vorderseite des Handapparates derart angeordnet ist, daß die Emsprechoffnung des Mikrofons m der Ebene der Vorderseite des Handapparates endet und die hintere Kompensationsoffnung des Mikrofons im Bereich der Unterseite des Handapparates endet.This object is achieved in the arrangement mentioned at the outset in that the microphone is a pressure gradient receiver designed with a unidirectional directional characteristic, which is arranged on the front of the handset in such a way that the opening of the microphone ends at the level of the front of the handset and the rear compensation opening of the microphone ends in the area of the underside of the handset.
Bei dem erfmdungsgemäßen Handapparat wird der Schall von der Horkapsel unterdruckt, wobei keine Kosten für eine aufwendige mechanische Konstruktion oder für eine digitale Signalverar- beitung entstehen. Weiterhin wird auch der Schall aus dem Handapparateinneren, der durch Gehauseundichtigkeiten austritt, unterdruckt. Daruberhmaus unterdruckt die Richtcharakteristik des unidirektionalen Mikrofons auch den Stor- schall aus der Umgebung.In the handset according to the invention, the sound is suppressed by the horn capsule, with no costs for a complex mechanical construction or for digital signal processing. Furthermore, the sound from the inside of the handset, which escapes through housing leaks, is also suppressed. The directional characteristic of the unidirectional microphone also suppresses the ambient noise from the surroundings.
Ein weiterer Vorteil des erfmdungsgemaßen Handapparates liegt darin, daß durch Drehen der Mikrofonkapsel das Dicken- maß des Mikrofons anstatt des Durchmessers für die Einbaulange im Handapparat bestimmend ist. Da die Dicke der Mikrofon¬ kapsel m der Regel nur weniger als 50 % des Durchmessers betragt, kann der Handapparat kurzer ausgebildet sein.Another advantage of the handset according to the invention is that by turning the microphone capsule, the thickness dimension of the microphone instead of the diameter is decisive for the installation length in the handset. Since the thickness of the microphone capsule ¬ m typically only amounts to less than 50% of the diameter, the handset can be formed short.
Weitere Ausgestaltungen des erfmdungsgemaßen Handapparates ergeben sich aus den Unteranspruchen sowie aus der Beschreibung eines Ausfuhrungsbeispiels.Further refinements of the handset according to the invention result from the subclaims and from the description of an exemplary embodiment.
Es zeigenShow it
Figur 1A schematisch ein Ausfuhrungsbeispiel eines erfm- dungsgemaßen Handapparates,FIG. 1A schematically shows an exemplary embodiment of a handset according to the invention,
Figur IB schematisch die Richtcharakteristik des Mikrofons m dem m Figur 1 dargestellten Handapparat,FIG. 1B schematically shows the directional characteristic of the microphone in the handset shown in FIG. 1,
Figur 2A schematisch einen bekannten Handapparat,2A schematically shows a known handset,
Figur 2B schematisch die Richtcharakteristik des Mikrofons m dem m Figur 1 dargestellten Handapparat,FIG. 2B schematically shows the directional characteristic of the microphone in the handset shown in FIG. 1,
Figur 3A schematisch einen weiteren bekannten Handapparat, undFigure 3A schematically shows another known handset, and
Figur 3B schematisch die Richtcharakteristik des Mikrofons m dem m Figur 1 dargestellten Handapparat,FIG. 3B schematically shows the directional characteristic of the microphone in the handset shown in FIG. 1,
Es soll zuerst anhand der Figuren 2A bis 3B, welche bekannte Handapparate darstellen, der Stand der Technik beschrieben werden.The prior art will first be described with reference to FIGS. 2A to 3B, which represent known handsets.
Abbildung 2A zeigt einen Handapparat mit einem bekannten un- gerichteten, omnidirektionales Mikrofon, welches keine bevor- zugte Schalleintrittsrichtung besitzt. Daher wird der Schall aus allen Richtungen mit gleicher Lautstarke aufgenommen, auch von der Handapparateunterseite. Dies gilt bis auf geringe Abschattungseffekte aufgrund der Abmessungen der Horkapsel αes Handapparates nahezu für das gesamte Frequenzband des Telefons.Figure 2A shows a handset with a known omnidirectional, omnidirectional microphone that does not have a preferred sound entry direction. The sound is therefore picked up from all directions with the same volume, including from the underside of the handset. Except for slight shadowing effects due to the dimensions of the horn capsule, the handset applies to almost the entire frequency band of the telephone.
Figur 2A zeigt einen Handapparat 7 langer Bauart mit einem omnidirektional gerichteten Mikrofon 8 und einer Horkapsel 5. In der Figur 2A ist bildlich angedeutet, wie sich diese Situation bei einem derartig aufgebauten Standardhandapparat darstellt. Ein Doppelfall zeigt von der Telefonunterseite m Richtung des Mundes. Die Lange dieses Pfeils beschreibt die Empfindlichkeit der Mikrofonanordnung in diese Richtung. Die m Figur 2B mit der geschlossenen Linie aufgespannte Flache der Richtcharakteristik beschreibt die Empfindlichkeit des Mikrofons für Umgebungsschall . Die darin eingezeichneten Em- zelfalle deuten die Mikrofonempfmdlichkeit in Richtung auf die Horkapsel sowie den Schallaustritt aus dem Handapparat aufgrund von Gehauseundichtigkeiten an. Die durch diese Pfeile aufgespannte Flache ist ein Maß für die Empfindlichkeit des Mikrofons für Schall aus dem Handapparat.FIG. 2A shows a handset 7 of long construction with an omnidirectionally directed microphone 8 and a horn capsule 5. FIG. 2A shows how this situation is presented in a standard handset constructed in this way. A double case shows m from the underside of the phone towards the mouth. The length of this arrow describes the sensitivity of the microphone arrangement in this direction. The area of the directional characteristic spanned by the closed line in FIG. 2B describes the sensitivity of the microphone to ambient sound. The individual trap shown therein indicates the sensitivity to the microphone towards the horn capsule and the sound emitted from the handset due to housing leaks. The area spanned by these arrows is a measure of the sensitivity of the microphone to sound from the handset.
Figur 3A zeigt einen bekannten Handapparat mit einem unidi- rektional ausgerichteten Richtmikrofon, welches auf der Oberseite des Handapparates über eine Schallemtrittsoffnung und auf der Vorderseite des Handapparates über eine rückwärtige Kompensationsoffnung verfugt. Hier ist deutlich zu erkennen, daß bei gleicher Empfindlichkeit des Mikrofons m Richtung Mund die aufgespannte Flache der Richtcharakteristik deutlich kleiner ist und somit weniger Umgebungsschall aufgenommen wird. Aus bestimmten Richtungen wird dabei sogar so gut wie kein Schall aufgenommen.FIG. 3A shows a known handset with a unidirectionally oriented directional microphone, which has a sound emission opening on the top of the handset and a rear compensation opening on the front of the handset. Here it can be clearly seen that with the same sensitivity of the microphone in the direction of the mouth, the spanned area of the directional characteristic is significantly smaller and thus less ambient sound is recorded. Almost no sound is recorded from certain directions.
In Figur 1A ist ein Handapparat 1 gemäß der vorliegenden Erfindung dargestellt. Dieser Handapparat verfugt über ein uni- direktional gerichtetes Mikrofon 2 mit einer Hauptschallem- trittsoffnung 3 und einer rückwärtigen Kompensationsoffnung 4, sowie über einen Hörer 5. Durch die veränderte Anordnung des Richtmikrofons 2 bei dem erfmdungsgemaßen Handapparat 1 kann eine Richtcharakteristik erzeugt werden, die bei miniaturisierten Handapparaten auf den Mund des Benutzers ausgerichtet ist und gleichzeitig ein Empfindlichkeitsminimum in Richtung des Hörers 5 besitzt.FIG. 1A shows a handset 1 according to the present invention. This handset has a unidirectionally directed microphone 2 with a main sound opening 3 and a rear compensation opening 4, as well as a receiver 5. Due to the changed arrangement of the directional microphone 2 in the handset 1 according to the invention For example, a directional characteristic can be generated which, in the case of miniaturized handsets, is aimed at the user's mouth and at the same time has a minimum sensitivity in the direction of the receiver 5.
Wie aus der Figur 1A zu erkennen ist, eignet sich diese Anordnung besonders gut für kurze Handapparate, da sich hier das Mikrofon hinter dem Mund bzw. oberhalb des Mundes befindet. Der Vergleich mit den Figuren 2A und 3A ergibt, daß bei gleicher Signalempfindlichkeit in Richtung Mund der Schall aus Richtung der Hörkapsel deutlich besser unterdrückt wird. Dabei ist die gesamte aufgespannte Fläche der Richtcharakteristik bei der Anordnung von Figur 2 und Figur 1 ähnlich, so daß auch der Umgebungsschall vergleichbar gut unterdrückt wird.As can be seen from FIG. 1A, this arrangement is particularly suitable for short handsets, since the microphone is located behind the mouth or above the mouth. The comparison with FIGS. 2A and 3A shows that with the same signal sensitivity towards the mouth, the sound from the direction of the earphone is suppressed significantly better. The entire spanned area is similar to the directional characteristic in the arrangement of FIG. 2 and FIG. 1, so that the ambient sound is also suppressed comparatively well.
Die Richtcharakteristik des unidirektionalen Mikrofons unterdrückt auch Störschall aus der Umgebung. Es ergibt sich ein Signal-Störschall-Verhältnis wie bei einer Mikrofonanordnung mit einem 0,7- bis 0,5-fachen Mund-Mikrofon-Abstand ohne eine Nachbearbeitung zur Störgeräuschbefreiung.The directional characteristic of the unidirectional microphone also suppresses ambient noise. The result is a signal-to-noise ratio as in the case of a microphone arrangement with a 0.7 to 0.5 times the mouth-microphone distance without post-processing for noise reduction.
Messungen an Versuchsaufbauten haben ergeben, daß mit dem erfindungsgemäßen Handapparat gegenüber dem in Figur 3A darge- stellten Handapparat um ca. 10 bis 15 dB und gegenüber dem in Figur 2A dargestellten Handapparat sogar um mehr als 15 dB bessere Entkopplungswerte erreichbar sind.Measurements on experimental setups have shown that the handset according to the invention achieves better decoupling values by about 10 to 15 dB compared to the handset shown in FIG. 3A and even more than 15 dB compared to the handset shown in FIG. 2A.
Durch das Drehen des Mikrofons ist anstatt des Durchmessers des Mikrofons die Dicke des Mikrofons für die Einbaulänge im Handapparat bestimmend. Da die Dicke des Mikrofons in der Regel weniger als 50 % des Mikrofondurchmessers beträgt, kann der Handapparat erheblich verkürzt werden.By turning the microphone instead of the diameter of the microphone, the thickness of the microphone determines the installation length in the handset. Since the thickness of the microphone is usually less than 50% of the microphone diameter, the handset can be shortened considerably.
Die unidirektionale Richtcharakteristik kann durch den gezielten Einsatz von Schutzfliesen beeinflußt werden. Da zum Schutz des Mikrofons in der Regel Schutzfließse auf die Mi- krofonkapsel oder den Schalleintritt im Handapparat aufgebracht werden, ermöglicht die Auswahl des Fließes unter Berücksichtigung dessen akustischer Impedanz den Einsatz von bidirektionalen Mikrofonkapseln. Diese sind in der Regel ein- facher aufgebaut, kleiner und kostengünstiger als Mikrofon- kapsel mit unidirektionaler Charakteristik.The unidirectional directional characteristic can be influenced by the targeted use of protective tiles. As a rule, protective flow is applied to the capsule or the sound inlet in the handset, the selection of the flow taking into account its acoustic impedance enables the use of bidirectional microphone capsules. These are generally simpler, smaller and less expensive than microphone capsules with unidirectional characteristics.
Weiterhin kann durch kleine Veränderungen des Fließmaterials die Richtcharakteristik und der Frequenzgang der Mikrofonein- heit verändert, stabilisiert und angepaßt werden. Furthermore, the directional characteristic and the frequency response of the microphone unit can be changed, stabilized and adapted by small changes in the flow material.

Claims

Patentansprüche Claims
1. Handapparat der Fernsprechtechnik mit eingebauter Hörkapsel und eingebautem Mikrofon, dadurch gekennzeichnet, daß das Mikrofon (2) ein mit einer unidirektionalen Richtcharakteristik ausgebildeter Druckgradientenempf nger ist, der auf der Vorderseite des Handapparates (1) derart angeordnet ist, daß die Einsprechöffnung (3) des Mikrofons (2) in der Ebene der Vorderseite des Handapparates (1) endet und die hintere Kompensationsöffnung (4) des Mikrofons (2) im Bereich der Unterseite des Handapparates (1) endet.1. Handset of telephony with built-in earpiece and built-in microphone, characterized in that the microphone (2) is designed with a unidirectional directional characteristic pressure gradient receiver, which is arranged on the front of the handset (1) in such a way that the speaking opening (3) of the microphone (2) ends in the plane of the front of the handset (1) and the rear compensation opening (4) of the microphone (2) ends in the area of the underside of the handset (1).
2. Handapparat nach -Anspruch 1, dadurch gekennzeichnet, daß das Mikrofon ein bidirektionales Mikrofon ist, dessen rückwärtige Öffnung stark bedämpft ist.2. Handset according to claim 1, characterized in that the microphone is a bidirectional microphone, the rear opening is heavily damped.
3. Handapparat nach Anspruch 2, dadurch gekennzeichnet, daß die Dämpfung durch geeignete Fließe erfolgt.3. Handset according to claim 2, characterized in that the damping takes place by means of suitable rivers.
4. Handapparat nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß durch Veränderungen des Fließmaterials die Richtcharakteristik und/oder der Frequenzgang des Mikrofons einstellbar sind. 4. Handset according to one of claims 1 to 3, characterized in that the directional characteristic and / or the frequency response of the microphone are adjustable by changing the flow material.
EP00910534A 1999-02-18 2000-02-17 Handset for telephone technology Withdrawn EP1151593A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19906811 1999-02-18
DE19906811 1999-02-18
PCT/DE2000/000451 WO2000049789A1 (en) 1999-02-18 2000-02-17 Handset for telephone technology

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EP1151593A1 true EP1151593A1 (en) 2001-11-07

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WO (1) WO2000049789A1 (en)

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Publication number Priority date Publication date Assignee Title
CN107872761A (en) * 2016-09-23 2018-04-03 苹果公司 For the pressure gradient microphone for the acoustic feature for measuring loudspeaker
CN107872761B (en) * 2016-09-23 2019-12-17 苹果公司 Pressure gradient microphone for measuring acoustic characteristics of a loudspeaker

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