EP3610989A1 - Headset for active noise suppression, helmet comprising such a headset, system comprising such a headset and a hand-held machine tool - Google Patents

Abstract

The headphone (1) according to the invention for active noise suppression of noise generated by a hand tool (2) comprises a first receiving unit (3) for receiving ambient noise (U), a second receiving unit (4) for receiving information (1) from the hand tool ( 2), which is indicative of a sound emission from the handheld power tool (2), and a control unit (5) for controlling a loudspeaker (6) of the headphones (1) by means of a control signal (A), the control unit (5) being set up for this purpose, to generate the control signal (A) for active noise suppression as a function of the received ambient noise (U) and of the received information (I).

Description

FIELD OF THE INVENTION

The present invention relates to a headphone for active noise suppression of noise generated by a handheld power tool, a helmet with such a headphone and a system with such a headphone, and the handheld power tool.

Hand machine tools, such as drilling machines, generate noise during operation. This noise can arise on the one hand from the handheld power tool itself and on the other hand from an interaction with an object to be processed. Noise can be hazardous to people's health. Therefore, it is desirable to suppress the noise generated when operating the handheld power tool.

Headphones with active noise suppression are used to reduce noise. Conventional headphones for active noise reduction in the field of telephony and speech are from US 5699436 . KR 101529253 B1 . US 2011/0280411 A1 . US 2014/0141724 A1 and US 2013/0083939 A1 known. A conventional headphone for active noise suppression in an internal combustion engine is from the US 2009/0260916 A1 known. A disadvantage of known headphones with active noise suppression is that there is no information from the noise source itself.

Against this background, the object of the present invention is to improve the active noise suppression of noise generated by a handheld power tool.

DISCLOSURE OF THE INVENTION

According to a first aspect, headphones are proposed for active noise suppression of noise generated by a handheld power tool. The headphones have a first receiving unit for receiving ambient noise and a second receiving unit for receiving information from the handheld power tool, which is indicative of a sound emission from the handheld power tool. The headphones have a control unit for controlling a loudspeaker of the headphones by means of a Control signal on. The control unit is set up to generate the control signal for active noise suppression as a function of the ambient noise received and the information received.

The headphone is, for example, a bluetooth headphone, the second receiving unit of which is set up to receive the information from the handheld power tool, in particular from a transmitting unit of the handheld power tool, as a Bluetooth signal.

The headphones can also be, for example, wired headphones which are wired to the handheld power tool. In particular, in the case of the wired headphones for receiving the information from the handheld power tool, the second receiving unit of the headphones is connected to the handheld power tool, in particular the transmitter unit of the handheld power tool, by means of a cable.

The headphones are used for active noise suppression of noise generated by the handheld power tool. The handheld power tool is, for example, a hammer drill, a combination hammer, a chisel hammer, a core drill, a grinder, a screwdriver, a bolt-feed tool or a saw. The handheld power tool preferably comprises a motor for moving a movable and / or rotatable element of the handheld power tool. The movable and / or rotatable element is in particular a separating means or processing means (such as a drill or a saw blade). The motor of the hand power tool is used in particular to set the separating or processing means in motion, for example in rotation and / or in an axial movement.

Noise generated by the handheld power tool during operation can be generated on the one hand by the handheld power tool itself, for example by the sound emission of a motor of the handheld power tool or by sound emission caused by vibration of the handheld power tool. On the other hand, this noise can arise from an interaction with an object to be processed, for example through the interaction of a drill with a wall during a drilling and / or hammering process.

The first receiving unit is set up to receive ambient noise. The first receiving unit is attached to an outside of the headphones, for example. For example, the first receiving unit is a microphone attached to the outside of the headphones. The ambient noise encompasses all sounds in the Surroundings of the headphones, in particular the noise emission of the hand-held power tool, the noise due to an interaction with the object to be processed and existing background noises.

The second receiving unit is set up to receive the information from the hand-held power tool, which is indicative of the sound emission of the hand-held power tool. In particular, the second receiving unit is set up to receive the information from a control unit of the hand power tool. In particular, the second receiving unit is set up to receive the information from the control unit via the transmitting unit of the handheld power tool.

The noise emission of the hand machine tool is the noise emission generated by the hand machine tool in operation. The noise emission of the handheld power tool comprises the noise emission generated by the handheld power tool itself. The sound emission of the hand-held power tool includes, for example, a sound emission that arises from the control of the hand-held power tool, for example through an engine rotation rate. The sound emission of the hand power tool includes, for example, a sound emission that is itself generated by the movable and / or rotatable separating or processing means. The sound emission of the handheld power tool includes, for example, a sound emission that is generated by a vibration of the handheld power tool, in particular a vibration of the handheld power tool due to the control of the handheld power tool. The sound emission of the handheld power tool can additionally include a sound emission that is generated by an interaction with the object to be processed, in particular a sound emission due to an interaction with the object to be processed in response to the control of the handheld power tool.

The information that is indicative of the noise emission of the hand-held power tool is, in particular, information that can be used to calculate or estimate, for example, also predict, the sound emission of the hand-held power tool. The information can have numerical values, for example, which are indicative of the noise emission of the hand power tool.

The control unit has, for example, a processor and a computer program executed with the aid of the processor. The control unit, for example the computer program, comprises in particular an algorithm which is set up to generate the drive signal for active noise suppression as a function of the received ambient noise and the received information.

The control unit, in particular the algorithm, generates, for example, the control signal such that a superimposition of the control signal with the noise generated during operation of the hand-held power tool leads to an at least partial mutual extinction. This reduces the noise arriving in the ear of the headphone wearer.

The control unit calculates, for example from the information received from the hand-held power tool and from the ambient noise received, an overall sound emission of the noise that occurs during operation of the hand-held power tool. The control unit generates the control signal from the calculated total noise emission, for example.

The respective unit, for example the control unit, can be implemented in terms of hardware and / or also in terms of software. In a hardware implementation, the unit can be designed as a device or as part of a device, for example as a computer or as a microprocessor. In a software implementation, the unit can be designed as a computer program product, as a function, as a routine, as part of a program code or as an executable object.

A computer program product, such as a computer program means, for example as a storage medium, such as Memory card, USB stick, CD-ROM, DVD, or in the form of a downloadable file from a server in a network. This can be done, for example, in a wireless communication network by transmitting a corresponding file with the computer program product or the computer program means.

Due to the second receiving unit for receiving the information from the hand tool and the control unit, which is set up to generate the control signal for active noise suppression depending on the received ambient noise and on the received information, the headphones can provide precise information about the sound emission of the hand tool receive. In particular, the headphones can receive the information about the sound emission of the handheld power tool in isolation from other noises. In particular, the noise behavior of the handheld power tool can be precisely calculated from the information, in particular also be predicted. This enables better active noise suppression or noise attenuation of noise generated by the handheld power tool.

According to one embodiment, the second receiving unit is set up to receive an operating state of a motor of the handheld power tool as at least part of the information.

An operating state of the motor of the handheld power tool includes in particular motor control data and motor measured values, such as, for example, an engine speed, an engine acceleration, an engine current, a commutation or control parameters.

Because the information includes the operating state of the motor of the handheld power tool, the headphones can receive precise information about a sound emission of the motor. For example, the headphones can thereby also receive information about a sound emission from the hand-held power tool that arises in response to the operating state of the motor. For example, the noise emission by a rotatable and / or movable element of the hand tool, by vibrations of the hand tool and / or by an interaction with an object to be processed can depend on the operating state of the motor.

According to a further embodiment, the second receiving unit is set up to receive, as at least part of the information, a rotational state of a rotatable element of the handheld power tool, in particular a device rotational rate in three axes.

A rotatable element of the hand power tool is in particular a rotatable separating or processing means, for example a drill or sanding sheet. The device rotation rate in three axes is, for example, a rotation rate of the rotatable element about an axis, which can have any orientation relative to the three spatial directions.

Because the information includes the rotational state of the rotatable element of the handheld power tool, the headphones can receive precise information about a sound emission due to the rotation of the rotatable element.

According to a further embodiment, the second receiving unit is set up to receive, as at least part of the information, an axial movement of a movable element of the hand-held power tool, in particular an impact frequency of a drill. The movable element can be an axially movable element, for example. The (axially) movable element can also be rotatable. The axial movement of the movable element of the hand power tool can also be a saw frequency of a saw blade.

Because the information includes the axial movement of the movable element of the handheld power tool, the headphones can receive precise information about a sound emission due to the axial movement of the movable element.

According to a further embodiment, the second receiving unit is set up to receive an oscillating movement of the hand-held power tool as at least part of the information, in particular device vibration measurement values in three axes.

The oscillation movement can be a vibration movement of the hand-held power tool, which arises, for example, in response to the activation of the motor of the hand-held power tool and / or to the interaction with the object to be processed. Device vibration measurement values in three axes are, for example, measurement values of the oscillation or vibration of the handheld power tool with respect to an oscillation or vibration in three spatial directions.

Because the information includes the oscillating movement of the hand tool, the headphones can receive precise information about a sound emission due to the oscillating movement of the hand tool.

In accordance with a further embodiment, the second receiving unit is set up to receive the information in phase with the ambient noise and / or to receive phase information for indicating a phase with the ambient noise as at least part of the information.

In particular, receiving the information in phase with the ambient noise means that the headphones are provided with the information which is indicative of the sound emission in such a way that a phase of the sound waves corresponds to a phase of the sound waves from the ambient noise.

In embodiments in which the second receiving unit is set up to receive the phase information for specifying the phase relating to the ambient noise as at least part of the information, the control unit can be set up to: To calculate the sound emission of the hand-held power tool using the information received such that a phase of the calculated sound emission, in particular a phase of the sound waves of the calculated sound emission, corresponds to a phase of the sound waves of the ambient noise.

Due to the fact that the information is received in phase with the ambient noise and / or because phase information for specifying a phase with the ambient noise is received as at least part of the information, the control unit can activate the control signal for active noise suppression as a function of the received ambient noise and of the received information more precisely. For example, the control unit can generate the control signal from a more precisely calculated overall sound emission, which is calculated in accordance with the phase. The fact that the control unit can generate the control signal more precisely enables even better active noise suppression of noise generated by the handheld power tool.

According to a further embodiment, the control unit is set up to calculate the sound emission of the hand-held power tool using the information received and to generate the control signal as a function of the calculated sound emission and the received ambient noise.

According to a further embodiment, the second receiving unit is set up to receive the sound emission of the handheld power tool as information.

According to a further embodiment, the control signal has destructive interferences for at least partially canceling the sound emission of the hand tool.

In particular, a superimposition of the control signal with the noise generated during the operation of the hand-held power tool creates destructive interference, which leads to an at least partial mutual cancellation of the control signal and the noise generated during operation of the hand-held power tool. This allows the noise arriving in the ear of the headphone wearer to be reduced.

According to a further embodiment, the second receiving unit is a Bluetooth module. This enables the information to be received wirelessly.

According to a further embodiment, the first receiving unit is a microphone.

According to a further embodiment, the headphones have the loudspeaker for transmitting sound waves as a function of the control signal.

According to a second aspect, a helmet with a headphone according to the first aspect or an embodiment of the first aspect is proposed.

As a result, a user of the handheld power tool wearing a protective helmet can easily use the noise suppression by the headphones.

According to a third aspect, a system with a headphone according to the first aspect or an embodiment of the first aspect and with a handheld power tool is proposed. The handheld power tool has, in particular, a transmitter unit for transmitting the information which is indicative of the sound emission of the handheld power tool.

The handheld power tool can in particular have at least one detection unit. The detection unit is, for example, a rotation rate sensor, an acceleration sensor, a motion sensor and / or a vibration sensor. The at least one detection unit is configured, for example, to detect an operating state of a motor of the hand-held power tool, a rotational state of a rotatable element of the hand-held power tool, an axial movement of a movable element of the hand-held power tool, and / or a vibration state of the hand-held power tool.

The handheld power tool has in particular a control unit. The control unit of the handheld power tool can be set up to receive the acquired measurement data of the at least one detection unit and to output it to the transmission unit of the handheld power tool as the information which is indicative of the sound emission of the handheld power tool.

In embodiments in which the second receiving unit of the headphones is set up to receive the sound emission of the handheld power tool as information, the control unit of the handheld power tool can be set up to calculate the sound emission of the handheld power tool using the measurement data recorded by the at least one detection unit and the calculated data Output sound emission to the transmitter unit of the hand tool.

According to a further embodiment, the transmission unit has a Bluetooth module for transmitting the information.

This allows the information to be sent wirelessly from the handheld power tool to the headphones.

The embodiments and features described for the headphones apply accordingly to the system and vice versa.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1

eine schematische Ansicht eines Kopfhörers zur aktiven Lärmunterdrückung;

Fig. 2

eine schematische Ansicht eines Systems, welches den Kopfhörer gemäß Fig. 1 und eine Handwerkzeugmaschine aufweist; und

Fig. 3

eine schematische Ansicht eines Helms mit einem Kopfhörer gemäß Fig. 1.

The following description explains the invention using exemplary embodiments and figures. The figures show:

Fig. 1

a schematic view of a headphone for active noise suppression;

Fig. 2

is a schematic view of a system according to the headphones Fig. 1 and has a hand machine tool; and

Fig. 3

a schematic view of a helmet with a headphone according Fig. 1 ,

Identical or functionally identical elements are indicated by the same reference symbols in the figures, unless stated otherwise.

EMBODIMENTS OF THE INVENTION

Fig. 1 shows a schematic view of a headphone 1 for active noise suppression of noise generated by a handheld power tool 2.

The headphone 1 is, for example, a Bluetooth headphone. The headphones 1 have a first receiving unit 3 for receiving ambient noise U from the surroundings of the headphones 1. The first receiving unit 3 is, for example, a microphone which is attached to the headphones 1, for example an outside of the headphones 1. The microphone 3 receives in particular a noise emission that arises when the handheld power tool 2 is in operation.

The hand tool 2 is in the example of Fig. 1 a hammer drill. In other embodiments, the handheld power tool 2 can also be a chisel hammer, a core drill, a grinding machine, a screwdriver, a bolt-pushing tool, a setting tool or a saw.

When the hammer drill 2 is in operation, noise is emitted on the one hand by the hammer drill 2 itself, for example engine noises are generated by the hammer drill 2. In addition, when the hammer drill 2 is in operation, noise is generated by an interaction of the hammer drill 2 with an object to be processed. For example, when drilling a hole in a wall, noise is generated by the drilling and hitting process of the hammer drill 2, in particular by drilling and hitting the wall. The microphone 3, which receives all the ambient noise U in the vicinity of the headphones 1, therefore receives the sound emission of the hammer drill 2 and the sound emission due to the interaction with the wall when drilling the hole during operation of the hammer drill 2.

The hammer drill 2 further has a second receiving unit 4 for receiving information I from the hammer drill 2, which is indicative of the sound emission of the hammer drill 2. The second receiving unit 4 is in the example of FIG Fig. 1 in particular a Bluetooth module which receives the information I from the rotary hammer 2 in the form of a Bluetooth signal.

The hammer drill 2 also has a control unit 5 for controlling a loudspeaker 6 of the headphones 1 by means of a control signal A. The control unit 5 is set up to generate the control signal A for active noise suppression as a function of the ambient noise U received and the information I received.

The microphone 3, which receives the ambient noise U, is set up to transmit the received ambient noise U to the control unit 5. The Bluetooth module 4, which receives the information I from the hammer drill 2, is set up to also transmit the received information I to the control unit 5.

The control unit 5 has, for example, an algorithm for processing the received ambient noise U and the received information I. In particular, the algorithm is able to calculate the sound emission of the hammer drill 2 from the information I received, in particular in phase-correct manner with respect to the ambient noise U to calculate. The algorithm is able to generate the control signal A from the sound emission of the rotary hammer 2 calculated from the information I and the ambient noise U recorded by the microphone 3. The control unit 5 is set up to control the loudspeaker 6 with the control signal A, so that the loudspeaker 6 emits sound waves S as a function of the control signal A. The sound waves S emitted by the loudspeaker 6 lead to destructive interference with the drilling noise. In particular, the superimposition of the noise generated during operation of the rotary hammer 2 with the sound waves S emitted by the loudspeaker 6 leads to destructive interference. The noise generated during operation of the rotary hammer 2 is at least partially canceled out by the destructive interference. As a result, no or only a small part of the drilling noise arrives in the ear of the headphone wearer and his hearing is protected.

The fact that the control unit 5 generates the control signal A leading to the destructive interference from the microphone data U and from precise information I supplied directly from the hammer drill 2 about the sound emission of the hammer drill 2, the control signal A can be generated better and more accurately. In particular, the control signal A can thereby be generated in such a way that further destructive interference is achieved. This allows better noise suppression to be achieved.

In the following, a system 7 consisting of a headphone 1 and a handheld power tool 2 with reference to FIGS Fig. 2 and 3 described.

Fig. 2 shows a schematic view of the system 7, which the headphones 1 according to Fig. 1 and the hand machine tool 2. Fig. 3 shows a further schematic view of the system 7 with a helmet 13, which has the headphones 1, and the hand-held power tool 2.

The headphone 1 of the system 7 is identical to that in relation to FIG Fig. 1 described headphones 1. A description of the same features is omitted.

As in Fig. 2 shown, the system 7 has the hand tool 2, which is also a hammer drill in this example. The hammer drill 2 has a transmission unit 8 for transmitting the information I from the hammer drill 2. In this example, the transmission unit 8 is a Bluetooth module for transmitting the information I in the form of a Bluetooth signal to the Bluetooth module 4 of the headphones 1.

The rotary hammer 2 has a first detection unit 9 for detecting a rotation rate D in three axes of a drill 14 of the rotary hammer 2. The drill 14 is exemplary in Fig. 3 shown. The detection unit 9 is in particular a rotation rate sensor. The hammer drill 2 has a second detection unit 10 for the detection of vibration measured values V in three axes of the hammer drill 2. The second detection unit 10 is in particular a vibration sensor. The hammer drill 2 has a third detection unit 11 for detecting an operating state of an engine (not shown) of the hammer drill 2. In particular, the third detection unit 11 serves for the detection of engine control data and engine measured values M of the engine. For example, the third detection unit 11 is a rotation rate sensor that detects an engine rotation rate.

The rotary hammer 2 has a control unit 12 which is set up to receive the measurement data D, V, M from the detection units 9, 10, 11 of the rotary hammer 2. In particular, the control unit 12 is set up to receive the rotation rate D from the first detection unit 9, vibration measurement values V in three axes from the second detection unit 10 and motor control data and motor measurement values M from the third detection unit 11. The control unit 12 is also set up to output the measurement data D, V, M received from the detection units 9, 10, 11 as the information I, which is indicative of the sound emission of the hammer drill 2, to the transmission unit 8 of the drill hammer 2.

The transmission unit 8 of the hammer drill 2, which is a Bluetooth module, sends the information I wirelessly to the second reception unit 4 of the headphones 2. The second reception unit 4 receives the information I, which includes the rotation rate D, the vibration measurement values V and the engine control data and engine measurement values M of the hammer drill 2. The control unit 5 of the headphones 2 then uses an algorithm to generate the control signal A from the information I received by the second receiving unit 4 and the ambient noise U received by the microphone 3. The headphones 1 have the loudspeaker 6 on the inside. The control unit 5 sends the control signal A to the loudspeaker 6. The loudspeaker 6 sends out sound waves S as a function of the control signal A. The sound waves S based on the control signal A are superimposed on the sound waves of the noise caused by the hammer drill 2 during a drilling and striking process. The superimposition leads to an at least partial extinction of the sound waves S of the control signal A and the sound waves of the noise caused by the hammer drill 2. As a result, a worker using the hammer drill 2 and wearing the headphones 1 can be protected from noise by the hammer drill 2 and the drilling operation.

As in Fig. 3 shown, the headphones 1 can be integrated with the helmet 13. The helmet 13 is in particular a protective helmet. The helmet 13 with the headphones 1 thus protects the wearer from head injuries and from noise.

LIST OF REFERENCE NUMBERS

1

headphone

2

Hand tool (hammer drill)

3

first receiving unit (microphone)

4

second receiver unit (Bluetooth module)

5

control unit

6

speaker

7

system

8th

Transmitter unit (Bluetooth module)

9

first detection unit

10

second detection unit

11

third detection unit

12

control unit

13

helmet

14

drill

A

control signal

D

rotation rate

I

information

M

Engine control data and engine measurements

S

sound waves

U

ambient noise

V

Vibration measurements

Claims (15)

Headphones (1) for active noise suppression of noise generated by a hand tool (2), with a first receiving unit (3) for receiving ambient noise (U), a second receiving unit (4) for receiving information (I) from the hand tool (2), which is indicative of a sound emission from the hand tool (2), and a control unit (5) for controlling a loudspeaker (6) of the headphones (1) by means of a control signal (A), the control unit (5) being set up to control the control signal (A) for active noise suppression as a function of the ambient noise received (U ) and from the received information (I). Headphones according to claim 1, characterized in that the second receiving unit (4) is set up to receive an operating state (M) of an engine of the hand-held power tool (2) as at least part of the information (I). Headphones according to claim 1 or 2, characterized in that the second receiving unit (4) is set up to receive, as at least part of the information (I), a rotational state (D) of a rotatable element (14) of the hand tool (2), in particular one Device rotation rate in three axes. Headphones according to one of Claims 1 to 3, characterized in that the second receiving unit (4) is set up to receive, as at least part of the information (I), an axial movement of a movable element (14) of the hand tool (2), in particular one Impact frequency of a drill. Headphones according to one of claims 1 to 4, characterized in that the second receiving unit (4) is set up to receive, as at least part of the information (I), an oscillating movement (V) of the handheld power tool (2), in particular device vibration measurement values in three Axes. Headphones according to one of claims 1 to 5, characterized in that the second receiving unit (4) is set up to receive the information (I) in phase with the ambient noise (U) and / or as at least part of the information (I) is phase information to indicate a phase to receive the ambient noise (U). Headphones according to one of claims 1 to 6, characterized in that the control unit (5) is set up to calculate the sound emission of the hand-held power tool (2) by means of the received information (I) and the control signal (A) as a function of the calculated sound emission and to generate the received ambient noise (U). Headphones according to one of claims 1 to 6, characterized in that the second receiving unit (4) is set up to receive the sound emission of the hand-held power tool (2) as information (I). Headphones according to one of claims 1 to 8, characterized in that the control signal (A) has destructive interferences for at least partially canceling the sound emission of the hand tool (2). Headphones according to one of claims 1 to 9, characterized in that the second receiving unit (4) is a Bluetooth module. Headphones according to one of claims 1 to 10, characterized in that the first receiving unit (3) is a microphone. Headphones according to one of claims 1 to 11, characterized in that it has the loudspeaker (6) for transmitting sound waves (S) as a function of the control signal (A). Helmet (13) with a headphone (1) according to one of claims 1 to 12. System (7) with a headphone (1) for active noise suppression according to one of claims 1 to 12 and a hand tool (2) with a transmitter unit (8) for sending the information (I) which is indicative of the sound emission of the hand tool (2) is. System according to claim 14, characterized in that the transmission unit (8) has a Bluetooth module for transmitting the information (I).

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