DE2432019B1

DE2432019B1 - Hearing aid with induction pick-up coil

Info

Publication number: DE2432019B1
Application number: DE2432019A
Authority: DE
Inventors: Hans-Joachim 8500 Nuernberg Weiss
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 1974-07-03
Filing date: 1974-07-03
Publication date: 1975-10-02

Description

Bei der gleichzeitigen Einschaltung des Mikrofons 2 und der Spule 3 als Aufnahmeelemente wird auch der Steller 13 wirksam. Mit seinem Abgriff 14 kann die ,mplitude des vom Mikrofon 2 kommenden Signals verändert werden, weil durch Veränderung des Widerstandes im Steller 13. der zwischen dem Abgriff 14 und dem Mikrofon 2 liegt, das Mikrofon bis zum Kurzschluß belastet wird. Dadurch ist das Mikrofon kontinuierlich an den Verstärker 1 anschaltbar und entgegengesetzt auch wieder kontinuierlich ausblendbar. When the microphone 2 and the coil are switched on at the same time 3, the actuator 13 is also effective as receiving elements. With his tap 14 can the amplitude of the signal coming from the microphone 2 changes will, because by changing the resistance in the actuator 13. between the tap 14 and the microphone 2 lies, the microphone is loaded until the short circuit. Through this the microphone is continuously connectable to the amplifier 1 and opposite can also be faded out continuously again.

In der F i g. 2 ist wie bei einer Anordnung nach F i g. 1 an einem Verstärker 21 mit mehreren Transistorstufen ein Mikrofon 22 angeschlossen sowie eine Induktions-Aufnahmespule 23. Auch bei diesem Gerät wird an einem über einen Steckkontakt 24 angeschlossenen Hörer 25 das verstärkte Signal hörbar gemacht. In FIG. 2 is like an arrangement according to FIG. 1 on one Amplifier 21 with a plurality of transistor stages connected to a microphone 22 as well an induction pick-up coil 23. This device is also connected to a Plug contact 24 connected earpiece 25 made the amplified signal audible.

Das Mikrofon 22 liegt über einen Koppelkondensator 26 am Verstärker 21, der durch An- und Abschalten einer Stromquelle 27 mittels eines Schalters 28 betrieben werden kann. Als Einstellmittel ist ein veränderbarer Widerstand 29 vorgesehen, dessen Abgriff ein Schleifkontakt 30 ist. Dieser ist so geschaltet, daß über den Widerstand 29 einerseits das Mikrofon 22 und andererseits die Spule 23 kurzgeschlossen werden kann.The microphone 22 is connected to the amplifier via a coupling capacitor 26 21, which is activated by switching a current source 27 on and off by means of a switch 28 can be operated. A variable resistor 29 is provided as a setting means, whose tap is a sliding contact 30. This is switched in such a way that the Resistor 29 on the one hand the microphone 22 and on the other hand the coil 23 short-circuited can be.

je nachdem, an welches Ende der Schleifkontakt 30 geschoben wird. In den Zwischenstellungen werden die beiden Aufnahmeelemente 22 und 23 jeweils nur teilweise kurzgeschlossen. Je nach dem Verschieben des Kontaktes 30 werden die Anteile des Kurzschlusses der beiden Elemente einander gegenläufig verändert. Dies beruht darauf, daß die eine Zuführung des Mikrofons 22 zum Verstärker 21 über die Leitung 31 erfolgt, während die entsprechende eine Zuleitung von der Spule 23 über die Leitung 32 zum Verstärker läuft. Der Widerstand 29 verbindet die Leitungen 31 und 32. Sein Abgriff, d. h. der Schleifkontakt 30, ist mit der zweiten.depending on which end the sliding contact 30 is pushed to. In the intermediate positions, the two receiving elements 22 and 23 are each only partially shorted. Depending on how the Contact 30 becomes the shares the short circuit of the two elements changed in opposite directions. This is based that the one feed of the microphone 22 to the amplifier 21 via the line 31 takes place, while the corresponding one feed line from the coil 23 via the line 32 running to the amplifier. Resistor 29 connects lines 31 and 32. Its Tap, d. H. the sliding contact 30, is with the second.

dem Mikrofon 22 und der Spule 23 gemeinsamen Leitung 33 zum Verstärker 21 verbunden. Wird also der Schleifkontakt 30 zur Verbindung mit der Leitung 32 hin verschoben, so nimmt die Wirksamkeit des Mikrofons zu, weil der Anteil des Widerstandes 29. der die Spule 23 überbrückt, dadurch verkleinert wird. Dies bedeutet aber gleichzeitig, daß die Wirksamkeit der Spule 23 abnimmt. Dabei wird gleichzeitig der dem Mikrofon 22 zugeordnete Anteil des Widerstandes 29. der zur Leitung 31 hin liegt, größer, so daß die Wirkung des Mikrofons 22 zunimmt. Bei einer Verschiebung des Kontaktes 30 in Gegenrichtung verändern sich die Gegebenheiten entgegengesetzt, weil dann der das Mikrofon 22 überbrückende Anteil des Widerstandes 29 abnimmt und derjenige. der die Spule 23 überbrückt. erhöht wird.the microphone 22 and the coil 23 common line 33 to the amplifier 21 connected. So if sliding contact 30 is used to connect to line 32 shifted towards, the effectiveness of the microphone increases, because the portion of the resistance 29. which bridges the coil 23, is thereby reduced in size. But at the same time this means that the effectiveness of the coil 23 decreases. At the same time, the microphone is used 22 associated portion of the resistor 29, which is towards the line 31, greater, so that the effect of the microphone 22 increases. When the contact is moved 30 in the opposite direction, the conditions change in the opposite direction, because then that the microphone 22 bridging portion of the resistor 29 decreases and that. which bridges the coil 23. is increased.

Claims

Claims: 1. Electric hearing aid with induction pick-up coil, which can be connected to an amplifier in addition to a microphone, whose amplified Signals converted back into acoustically perceptible signals via another converter will. characterized in that with a common connection of microphone and Induction pick-up coil a steeper is provided to adjust the effectiveness at least one of the transducers.

2. Apparatus according to claim 1, characterized in that the actuator assigned to the microphone.

3. Apparatus according to claim 1, characterized. that the actuator is a changeable resistor.

4. Apparatus according to claim 1, characterized. that the controller acting in opposite directions assigned to both the microphone and the induction coil is.

5. Apparatus according to claim 4, characterized in that of the two the signal-carrying lines of the two converters are separated from each other go directly to the amplifier and the other two lines in one common Connection and that there is a resistor between the two separated lines, on which there is a movable tap that is connected to the common connection is.

A hearing aid with an induction pick-up coil according to the preamble of the claim 1 is already known from the journal »Hörgeräteakustik« 8 (1969). No. 2.

P.52.

It is known to be in churches. Theaters. Cinemas etc.

so-called induction loops laid. about the electromagnetic Signals can be sent. which can be received with induction pick-up coils. which are built into conventional hearing aids. Usually this is the reception equipped devices for the direct recording of acoustic signals also have a microphone assigned as an electroacoustic transducer. In known devices there is then a switch available, with which either the hearing coil or the microphone or both transducers can be switched on at the same time. The simultaneous effect of both converters is intended for give the hearing impaired the opportunity to use the induction coil To receive information without interference, but also the orientation to the to retain the acoustic landscape in its immediate vicinity. However, it is disadvantageous with the devices available. that the volume differences Constant change because of the unequal reception conditions of the two types of transducers the volume require to always have the same acoustic output level on the listener to obtain.

The invention is based on the object. with a hearing aid Induction pick-up coil according to the preamble of claim 1 the possibility to be provided. an adjustment to the circumstances of the hearing impaired in a simple way to be able to achieve. This object is achieved according to the invention by the in the characterizing Part of claim 1 specified dimensions assumption solved.

By using an actuator. at least the effectiveness It is possible to change one of the transducers. the volumes to change the signals recorded in the two converters against each other. that the desired effect can be achieved. This can be something like that. that prefers the Signals sent via an induction loop can be received and evaluated are. while those recorded by the microphone come from the immediate vicinity Signals only convey the security of being well oriented in space. on the other hand but it can also be important. prefer direct acoustic orientation. because it contains the primary information and the signals from the induction loop available as additional information. In a simple way this can be realized in this way. that by means of a control the microphone of Makes zero fade in until it is fully effective. This is what makes this possible previously not available in devices for the hearing impaired. for the hard of hearing but because of the Easier handling important level equality with inductive or acoustic Signal recording.

As a controller, all are from electronics and in particular through Hearing aid technology known combinations of switching elements applicable with which the amplitude of the signals emitted by the transducers separately or in opposite directions can be influenced. These are modifiable in one or the other signal path Resistors that are effective in the manner of a gain controller. As is well known these are circuit arrangements. the z. B. can be used in mixer amplifiers.

Further details and advantages of the invention are provided below explained on the basis of the exemplary embodiments shown in the figures. In the F i g. 1 a hearing aid is shown schematically. in which a circuit is indicated is, in which the effectiveness of the microphone can be changed according to the invention. and in FIG. 2 shows an arrangement. in which the effectiveness of both recording transducers influenced in opposite directions to one another according to a modified embodiment of the invention can be.

In the case of the FIG. The arrangement shown in FIG. 1 is on an amplifier 1. the multiple. z. B. five. Transistor stages can contain a microphone in the input 2 and an induction take-up coil 3 attached. Through both elements 2 and 3 will be Signals generated. those in amplifier 1 are amplified at one via a plug contact 4 connected earphones 5 can be heard.

The microphone 2 is connected to the amplifier 1 via a coupling capacitor 6 connected. The device can be put into operation with a 1.5 V battery 7 if their contact with the hearing aid circuit is established via a switch 8.

In the connection of the microphone 2 to the amplifier 1 is a switch 9 is provided, the switching points 10, 11 and 12 has. The device is at point 10 switched off. At point 11, the hearing coil 3 is effective as a recording element and on Switching point 12 the microphone 2 with simultaneous short-circuiting of the coil 3.