BACKGROUND

FIELD OF THE DISCLOSURE

[0001] The present disclosure relates to a portable electrical device. The present disclosure further relates to a method for controlling a setting or an operation of a portable electrical device and a computer program comprising computer program means for causing a portable electrical device to carry out a method for controlling a setting or an operation of a portable electrical device.

DESCRIPTION OF RELATED ART [0002] Portable electrical devices, like for example mobile phones, may ring in a quiet area, like for example cinema, theater, church, opera, business meetings, school, etc., disturbing other spectators attending the event and bringing the user of the phone in an embarrassing situation. Most of these devices provide a silent mode, but users tend to forget to put the mobile phone in said silent mode before attending such an event.

[0003] Today's mobile phones cannot detect or identify if they are located in a user's pocket in close touch to the user's body where the user feels the vibration or if they are located in any other place where vibration is not felt.

[0004] The "background" description provided herein is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventor(s), to the extent it is described in this background section, as well as aspects of the description which may not otherwise qualify as prior art at the time of filing, are neither expressly or impliedly admitted as prior art against the present disclosure.

SUMMARY

[0005] It is an object to provide a portable electrical device allowing an improved operation and setting and a corresponding method for improving the operation and setting of a portable electrical device. It is a further object to provide a portable electrical device that can detect or identify it is worn by a user close to the user's body or not.

[0006] According to a first aspect of the present disclosure a portable electrical device is provided comprising a first sensor arranged in or at a front surface of a portable electrical device configured to generate a first sensor signal influenced by the environment of said first sensor, a second sensor, of the same type as said first sensor, arranged in or at a rear surface of the device and configured to generate a second sensor signal influenced by the environment of said second sensor, a processor configured to analyze the first and second sensor signals and a control unit configured to control a setting or an operation of the device, based on the result of the analysis.

[0007] According to a further aspect there is provided a method for controlling a setting or an operation of a portable electrical device, said method comprising generating a first sensor signal influenced by the environment of said first sensor; generating a second sensor signal influenced by the environment of said second sensor; analyzing the first and second sensor signals; and controlling a setting or an operation of the portable electrical device, based on the result of the analysis.

[0008] According to still further aspects a computer program comprising program means for causing a portable electrical device to carry out the steps of the method disclosed herein, when said computer program is carried out on a portable electrical device, as well as a non-transitory computer-readable recording medium that stores therein a computer program product, which, when executed by a processor, causes the method disclosed herein to be performed are provided.

[0009] Further embodiments are defined in the dependent claims. It shall be understood that the disclosed method and the disclosed computer program have similar and/or identical further embodiments as the claimed portable electrical device and as defined in the dependent claims.

[0010] One of the aspects of the disclosure is to enable a portable electrical device to control a setting or an operation, e.g. to switch the device between silent mode and normal mode, automatically based on a recognition or identification of the situation in which the device is located. Certain situations, in particular if the device is carried by the user (e.g. in the jacket's inner pocket)/near/in contact with the user's body or not, can be recognized based on the first and second sensor signals since the respective first and second sensors are arranged at the device such that they are arranged differently with respect to the user's body if the device is worn by the user and, consequently, deliver different signals if the device is worn by the user. Based on a combined analysis of the two sensor signals such a use situation can be distinguished from other use situations, e.g. when the device is placed in a bag or lying on the table. Thus, the user is not compelled to set the device by himself, which makes the setting and operation of the device easier, more comfortable and less complicated. Further, it is also prevented that a user forgets to set the device, for example, in silent mode when the device is worn at the user's body and the user enters a place where it should be in silent mode (e.g. in a church or theatre), in which only vibration is used to signal any event, such as an incoming call.

[0011] The foregoing paragraphs have been provided by way of general introduction, and are not intended to limit the scope of the following claims. The described embodiments, together with further advantages, will be best understood by reference to the following detailed description taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] A more complete appreciation of the disclosure and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:

Fig. 1 shows a schematic diagram of the portable electric device according to one embodiment of the present disclosure,

Fig. 2 shows a schematic diagram of the portable electric device according to a further embodiment of the present disclosure and

Fig. 3 shows a flow chart of the method according to the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS [0013] Portable electrical devices like mobile phones, smartphones, tablet computers, pagers, and e-book readers are ubiquitous. Most of these devices comprise means for communication, like for example to establish a WiFi connection, receive incoming calls and receive emails etc. In most cases theses devices may notify the user of an event like an incoming call or the reception of an SMS message. But also notifications of the device's status are possible, like a low battery warning. In the case of a smartphone a lot of notifications are possible, since a huge variety of apps which may notify the user is available. Such apps are for example calendar apps, notifying the user of an approaching appointment, but also a huge variety of messenger aps, news tickers, etc. are possible. Also sports or activity apps may inform if any speed, altitude or acceleration limit is passed, any distance is reached or a full loop is covered on a race track. Scuba divers like to be informed if any depth is reached or timings are done when emerging back to surface. In any case, a lot of opportunities where the portable electrical device may notify the user can occur.

[0014] To define the signal used to notify the user, the device has to be configured and set in advance by the user. Some users like to be notified by an acoustic signal, others prefer a vibration signal. Nevertheless, there are situations where one specific type of signal is advantageous over the other. An acoustic signal is preferable if the device is not worn at the body of a user, whereas a vibrating signal is in most cases preferable if the device is worn at the body of the user. In several situations, like for example in a church, a business meeting etc., it is preferable to turn off an acoustic alarm signal. As everyday experience shows, people tend to forget to turn off the acoustic alarm signal before attending such events. Also people forget to bring back original settings after attending such events.

[0015] Thus, several approaches are known to automatically set the profile of a portable electrical device. It is for example known to have a profile depending on daytime, and turning for example a mobile phone silent during the night. This may also be used to turn the device silent when attending a regular appointment, like school or so. It is also known to define a profile which is activated depending on the location of the device, wherein the location of the device is determined by a WiFi signal, by GPS or by the GSM transmitting station associated with the mobile phone.

[0016] However, all these solutions have to be configured in advance. Consequently, they lack a proper detection to determine in each single situation, which signal to use to notify the user, especially when unforeseen situations occur. For example, if a lecture at a university is shifted, the above mentioned time dependent profile solution will not work.

[0017] Also the location dependent profile solution has drawbacks. If for example the device is configured to ring when located at home, situations may occur in which a vibration alarm would be more useful, like during vacuum cleaning or listening to music with headphones. A lecture at the university might be shifted in location.

[0018] It is further known to monitor the historical records of the device's acceleration sensors and use the sensor's data fingerprint to identify the location of the device. Nevertheless, using this technique the sensors have to be read out constantly and the data derived has to be analyzed constantly, which results in large power consumption. This technique is also not suitable if the user of the device is not moving. Hence, there is a need for enabling mobile phone and other portable electrical devices to automatically perform a detection or identification if they are located in a user's pocket in close touch to the user's body or if they are located in any other place.

[0019] Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, Fig. 1 show a first embodiment of a portable electrical device 10 according to the present disclosure, which may e.g. be a mobile phone or smartphone. The portable electrical device 10 comprises a first sensor 12A on the front side 13A which is configured to generate a first sensor signal influenced by the environment of said first sensor 12A and a second sensor 12B on the rear side 13B which is configured to generate a second sensor signal influenced by the envi- ronment of said second sensor 12B, which is of the type as first sensor 12 A. The device 10 further comprises a processor 16 which is configured to analyze the first and second sensor signals and a control unit 18 which is configured to control a setting or an operation of the device 10.

[0020] Since the environment of the first and second sensors 12A, 12B is generally dependent on where the device 10 is located, the first and second sensor signals are generally dependent on the location (also called "use situation" herein, meaning particularly the place or situation where and how the device 10 is currently kept, such as in a bag, in a pocket, on the table, etc.). For instance, if the first and second sensors 12A, 12B are temperature sensors the temperature sensed by them may be substantially identical if the device is placed in a bag or on the table, but may be substantially different if the device 10 is worn by the user in a pocket of his clothes in which case one of the sensors (that is facing the user's body) will show a much higher temperature that the other sensor (that is facing away from the user's body). The combined analysis of the two sensor signals can then be used to distinguish if the device 10 is worn by the user or not.

[0021] The processor 16 may be configured to analyze whether the device 10 is worn at the body of the user based on the first and second sensor signals, to compute a difference of the amplitudes of said first and second signals and to compare said difference with a threshold value to decide whether the device 10 is worn at the body of the user. By determining whether the device 10 is worn at the body of the user, the settings of the device 10 can be adjusted accordingly. For example, a step counter of a fitness app can be activated only if the device 10 is worn at the body, and thus battery power can be saved.

[0022] According to a further embodiment, the control unit 18 is configured to set a vibration alarm, if the analysis indicates that the device 10 is worn at the body of a user and to disable a vibration alarm and set an acoustic alarm, if the analysis indicates that the device 10 is not worn at the body of the user. This is advantageous, since the vibration alarm is only needed and useful if the device 10 is worn at the body, because only in this case the vibration can be recognized by the user.

[0023] According to a further embodiment, the control unit 18 is configured to initiate a measurement by the first and second sensor 12A, 12B and/or initiate an analysis of the first and second sensor signals by the processor 16, if the device 10 shall notify a user of an event, and to decide which alarm signal to use for notifying the user, based on the result of the analysis. This is advantageous in order to save power, which is limited in the case of a portable electrical device 10, as the battery capacity is limited. If the measurement is carried out only when needed, the power consumption is kept as low as possible.

[0024] Users may forget to turn on the vibration alarm before putting the device 10 in the pocket and thus, in the case of a loud environment, users may miss a notification like an incoming phone call. By automatically setting the alarm signal this drawback can be overcome. Users may also forget to turn the device 10 into a silent mode which may result in a loud alarm during a business meeting, attending school, visiting an opera etc. This is also avoided by automatically setting the alarm signal. Still further, users may forget to turn on the acoustic alarm, if they take the device 10 out of the pocket. Thus, users may again miss a notification, since the vibration is almost not detectable if the device is not worn at the body. By automatically setting the alarm signal this drawback can also be overcome. If the device 10 is located on a table, a vibration may cause the device 10 to move on said table, and in the worst case fall off the table and break, which can also be avoided by automatically setting the alarm signal.

[0025] According to yet another embodiment, the control unit 18 is configured to set the device 10 in stand-by mode if the analysis indicates that the device 10 is worn at the body of the user. This is advantageous, since it is no more needed to explicitly set the device 10 in standby mode, but just put the device 10 in the pocket. This is more comforta- ble for the user and easier to handle. Furthermore, an unintended use of the device if a hardware button is unintentionally pressed while the device is in the pocket is prevented.

[0026] According to a further embodiment, the control unit 18 is configured to set the device 10 in an active mode, when the first and/or second sensor signals change and the analysis indicates that the device is not anymore worn at the body of the user. The user does then not need to set the device 10 in an active mode by himself but can start using the device 10 immediately after taking it out of the pocket, which contributes to a higher comfort. When the device 10 is taken out of the pocket, in most cases the user is about to use the device. Thus, setting the device in active mode will save time for the user and contribute to user comfort and a faster access of the device.

[0027] The analysis carried out by the processor 16 may further comprise forming a difference between the amplitude of the first sensor signal and the amplitude of the second sensor signal and comparing said difference with a predetermined threshold. Based on whether the difference is above or below said threshold, different locations of the device can be distinguished, which might be "at the body", "on a table", "in a bag" or "in a pocket, but not at the body". Generally, by using one pair of sensors 12A, 12B at least two different locations can be distinguished.

[0028] In a preferred embodiment the first and second sensors 12 A, 12B comprise distance sensors (e.g. infrared sensors, ultrasound sensors, etc.) for generating signals depending on the respective distances of the nearest object to the front and/or rear side of the device 10, wherein the processor 16 is configured to compare said first and second signal with each other, and wherein the control unit 18 is configured to control a setting or an operation of the device 10 based on the result of the comparison. In this way the distance of an object, e.g. the user's body or clothes, can be easily detected.

[0029] In another preferred embodiment the first and second sensors 12 A, 12B comprise optical sensors (e.g. cameras like the front and rear camera of a smartphone, brightness sensors, etc.) for generating signals depending on the respective illuminations at the front and/or rear side of the device 10, wherein the processor 16 is configured to compare said first and second signal with each other, and wherein the control unit 18 is configured to control a setting or an operation of the device 10 based on the result of the comparison. In this way, the dark human body, which is shadowed by the mobile phone on the one side, and ambient light on the other side may be distinguished.

[0030] In another preferred embodiment the first and second sensors 12A, 12B comprise temperature sensors for generating signals depending on the respective temperatures at the front and/or rear side of the device 10, wherein the processor 16 is configured to compare said first and second signal with each other, and wherein the control unit 18 is configured to control a setting or an operation of the device 10 based on the result of the comparison. The sensor facing the user's body may then record human body temperature (37°C) and the other sensor may record the temperature of the environment. Human body is a good temperature conductor. It either heats or cools the device, depending on outside temperature or actual device's power consumption. The device's self- heating may be detected by monitoring the own power consumption and considered when comparing the temperature records of both sensors.

[0031] In still another preferred embodiment the first and second sensors 12 A, 12B comprise capacitive sensors for generating signals depending on the capacity of the nearest object to the front side of the device 10 and/or the nearest object to the rear side of the device 10, wherein the processor 16 is configured to compare said first and second signal with each other, and wherein the control unit 18 is configured to control a setting or an operation of the device 10 based on the result of the comparison. The sensor facing the human body may then detect the presence of a human body being close to the device's surface providing a high capacitance. The sensor on the other side may detect only little capacitances caused by textile material of the clothing, handkerchief, etc. [0032] In another preferred embodiment the first and second sensors 12 A, 12B may comprise density sensors for generating signals depending on the respective densities at the front and/or rear side of the device 10, wherein the processor 16 is configured to compare said first and second signal with each other, and wherein the control unit 18 is configured to control a setting or an operation of the device 10 based on the result of the comparison. Material density sensors may identify human body (high density material) close to the device on one side and textile material (low density material) on the other side.

[0033] In another preferred embodiment the first and second sensors 12A, 12B may comprise radar sensors for generating signals depending on the respective distance to any objects at the front and/or rear side of the device 10, wherein the processor 16 is configured to compare said first and second signal with each other, and wherein the control unit 18 is configured to control a setting or an operation of the device 10 based on the result of the comparison. Radar sensors may identify the distance to the human body and also the materials on each the device's sides. Material consisting of or comprising a lot of water or metal have a high change in ε _Γ causing strong reflections for the electro-magnetic radar waves. Human body mainly consists of water causing high reflections to radar waves, whereas textile material usually does not cause any reflections to radar waves.

[0034] Hence, as shown by these various embodiments the results of the comparison can depend on the sensor type used, the threshold set and the conditions at the sensor. The present disclosure may be applied to various portable electrical devices, including but not limited to mobile phones, smartphones, tablet computers, pagers, sports trainers and e-book readers.

[0035] Fig. 2 shows another embodiment of a portable electrical device 10' comprising two pairs of sensors 12A, 12B, 14A, 14B. The first pair of sensors comprises a first sensor 12A on the front side 13A which is configured to generate a first sensor signal influenced by the environment of said first sensor 12A and a second sensor 12B on the rear side 13B which configured to generate a second sensor signal influenced by the environ- ment of said second sensor 12B of the same type as said first sensor 12 A. The second pair of sensors comprises a first sensor 14A on the front side 13A which is configured to generate a first sensor signal influenced by the environment of said first sensor 14A and a second sensor 14B on the rear side 13B which configured to generate a second sensor signal influenced by the environment of said second sensor 12B of the same type as said first sensor 14 A. The device 10' further comprises a processor 16 which is configured to analyze the first and second sensor signals of said pairs of sensors and a control unit 18 which is configured to control a setting or an operation of the device 10'.

[0036] The first pair of sensors 12A, 12B are generally of a different type than the second pair of sensors 14A, 14B. This provides more useful information for the analysis and allows distinguishing more use situations and locations of the device 10'.

[0037] The analysis of the sensor signals may comprise forming a difference between the amplitude of the first sensor signal and the amplitude of the second sensor signal of said first pair of sensors 12A, 12B, forming a difference between the amplitude of the first sensor signal and the amplitude of the second sensor signal of said second pair of sensors 14A, 14B and comparing said differences with predetermined thresholds. Based on whether the differences are above or below a threshold, different locations of the device 10' can be distinguished, which are "at the body", "on a table", "in a bag" or "in a pocket, but not at the body".

[0038] In this context it shall be noted that according to the present disclosure locations denoted with "at the body" may comprise situations in which the device is located very close to the body of the user, like in the pocket of the trousers, jacket or shirt. Locations denoted with "in bag" may comprise situations in which the device is located in any bag such as a handbag, suitcase, or in the pocket of a jacket which is not worn by a user. Locations denoted with "on table" may comprise situations in which the device 10 is located outside of a pocket e.g. on a table, on a chair or on the floor. [0039] The embodiment of the device 10' shown in Fig. 2 can be used to distinguish between the typical places of a portable electrical device and to control a setting or an operation of the device 10' based on the detected location, which further improves the handling and comfort in handling the device 10'. By using two pairs of sensors the accuracy of the detection can also be improved and redundancy can be provided to a certain extent. For instance, a pair of distance sensors and a pair of temperature, capacity or density sensors may be used. Other advantageous combinations of sensor pairs may be possible and can e.g. be derived from the table explained below.

[0040] In a further preferred embodiment, a pair of capacity sensors or density sensors is used, and the processor 16 is configured to form a difference of the first and second sensor signal and compare said difference with two thresholds, and determine from said comparisons whether the device 10 is worn at the body, located in a bag or lying on a table.

[0041] In another preferred embodiment the device 10 can comprise an anti-theft mode which can be activated by the user for example before entering public transport or so. In this mode the device 10 detects in the previously defined manner if taken out of the pocket and requests a security pin or any other known measure to authorize the user of the device 10, like for example a fingerprint scan. If the user is not authorized within a certain time, the device 10 generates a loud alarm signal or cannot be used at all. Thus, in a case of pocket-picking, within short time an alarm signal may be generated notifying the owner that his device has been stolen and helping to identify the thief.

[0042] In a further preferred embodiment the portable electrical device may comprise a mobile media player. In such an embodiment the control unit 18 may be configured to ignore settings from hardware buttons if the analysis reveals that the media player is worn at the body. An unintended turning up the volume can be prevented and the risk of ear damage can be reduced. [0043] In a further preferred embodiment, the control unit may be configured to ignore retroactively the inputs given in a short period of time before the media player was put into a pocket, because these inputs in most cases are unintentionally caused during the process of putting the media player into the pocket.

[0044] When particularly used for a mobile phone or smartphone, the control unit 18 may be configured to set a vibration alarm to notify the user if the device is worn at the body of the user. Further, the control unit 18 may be configured to switch off a vibration and set an acoustic alarm to notify the user if the device is lying on a table.

[0045] Fig. 3 shows a flowchart the steps of the method 100 according to the present disclosure for controlling a setting or an operation of a portable electrical device. The method comprises generating (S10) a first sensor signal influenced by the environment of said first sensor, generating (SI 2) a second sensor signal influenced by the environment of said second sensor, analyzing (SI 4) the first and second sensor signal and controlling (SI 6) a setting or an operation of the portable electrical device based on the result of the analysis.

[0046] One embodiment of the present disclosure can be an app for a smartphone, wherein by said app the main camera on the rear end of a typical smartphone is configured as first optical sensor 12A and the second cam at the front side is configured as second optical sensor 12B and the processor of the smartphone is configured to form a difference of said first and second sensors signals and then compare said difference with a predetermined threshold, wherein the operating system of the smartphone is configured to control a setting of the smartphone, like using a vibration alarm or an acoustic alarm signal. It shall be understood that the smartphone app has similar and/or identical further embodiments as the disclosed portable electrical device.

[0047] An overview of different locations and the result of the comparison of the formed difference of the first and second sensor signals with a predetermined threshold is given in the following table in which "+" means that the difference is above a certain threshold and "-" means that the difference is below a certain threshold.

' depending on conditions

* depending on threshold set

From this table it can be derived which sensor types can be combined to detect the three different locations defined therein.

[0048] Any technology monitoring the historical records of the device's sensors (e.g. acceleration or gravity sensor) and using sensor's data fingerprinting to identify the location of the device has the disadvantage that the permanent recording of the sensor's data cause constant power consumption. Comparing the measurements of the dual sensors is a one-time measurement and might be done only once in the case a phone call, message, mail or alarm arrives.

[0049] The proposed method may e.g. be implemented as a new user profile "unobtrusive" in addition to existing profiles (like "loud environment", "vibrate only", "normal").

[0050] The information if the portable electrical device is located close to human body might also be used to ignore all user inputs. E.g. the mechanical camera release button can be configured to switch on the device and activate the camera application in order to have a quick camera startup for releasing fast snapshots. Usually a mechanical camera release button is located on the rim of the device, at north-east orientation, if the operator watches the screen. The tissue of tight trousers (jeans) could also press the camera release button occasionally if the phone is located inside the pocket and the user is moving. This would consequence any dark snapshot inside the pocket. If the device is inside the pocket and it accepts any input from e.g. capacitive sensor, it might cause uncontrolled operations. In worst case it might delete files or call any contact. Using the present disclosure in an automatic 'input disable mode' the user does no more have to press the Off button before putting the device into his pocket. The device will automatically detect the status 'located inside the pocket' any switch off display, ignore any inputs, etc. The last actions may be half a second before reaching the status 'located inside the pocket' might also be ignored or even reverted because these action were caused during the placement of the device into the pocket.

[0051] Thus, the foregoing discussion discloses and describes merely exemplary embodiments of the present disclosure. As will be understood by those skilled in the art, the present disclosure may be embodied in other specific forms without departing from the scope or essential characteristics thereof. Accordingly, the disclosure of the present disclosure is intended to be illustrative, but not limiting of the scope of the disclosure, as well as other claims. The disclosure, including any readily discernible variants of the teachings herein, defines, in part, the scope of the foregoing claim terminology such that no inventive subject matter is dedicated to the public.

[0052] In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. A single element or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

[0053] In so far as embodiments of the disclosure have been described as being implemented, at least in part, by software-controlled data processing apparatus, it will be appreciated that a non-transitory machine-readable medium carrying such software, such as an optical disk, a magnetic disk, semiconductor memory or the like, is also considered to represent an embodiment of the present disclosure. Further, such a software may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.

[0054] It follows a list of further embodiments of the disclosed subject matter:

1. A portable electrical device comprising:

a first sensor arranged in or at a front surface of the device and configured to generate a first sensor signal influenced by the environment of said first sensor;

a second sensor, of the same type as said first sensor, arranged in or at a rear surface of the device and configured to generate a second sensor signal influenced by the environment of said second sensor;

a processor configured to analyze the first and second sensor signals; and a control unit configured to control a setting or an operation of the device, based on the result of the analysis.

2. The portable electrical device of any preceding embodiment, wherein the control unit is configured to

initiate a measurement by the first and second sensor and/or initiate an analysis of the first and second sensor signals by the processor, if the portable electrical device shall notify a user of an event, and

to decide which alarm signal to use for notifying the user, based on the result of the analysis.

3. The portable electrical device of any preceding embodiment, wherein the processor is configured to analyze whether the device is worn at the body of the user based on the first and second sensor signals, to compute a difference of the amplitudes of said first and second signals and to compare said difference with a threshold value to decide whether the device is worn at the body of the user. 4. The portable electrical device of embodiment 3, wherein the control unit is configured to

set a vibration alarm, if the analysis indicates that the portable electrical device is worn at the body of a user and

to disable a vibration alarm and set an acoustic alarm, if the analysis indicates that the portable electrical device is not worn at the body of the user.

5. The portable electrical device of embodiment 3, wherein the control unit is configured to set the portable electrical device in stand-by mode if the analysis indicates that the portable electrical device is worn at the body of the user.

6. The portable electrical device of embodiment 3, wherein the control unit is configured to set the portable electrical device in an active mode, when the first and/or second sensor signals change and the analysis indicates that the device is not anymore worn at the body of the user.

7. The portable electrical device of any preceding embodiment, wherein the first and second sensors comprise distance sensors for generating signals depending on the respective distances of the nearest object to the front and/or rear side of the portable electrical device,

wherein the processor is configured to compare said first and second signal with each other, and

wherein the control unit is configured to control a setting or an operation of the portable electrical device based on the result of the comparison.

8. The portable electrical device of any preceding embodiment, wherein the first and second sensors comprise optical sensors for generating signals depending on the respective illuminations at the front and/or rear side of the device,

wherein the processor is configured to compare said first and second signal with each other, and wherein the control unit is configured to control a setting or an operation of the portable electrical device based on the result of the comparison.

9. The portable electrical device of any preceding embodiment, wherein the first and second sensors comprise temperature sensors for generating signals depending on the respective temperatures at the front and/or rear side of the device,

wherein the processor is configured to compare said first and second signal with each other, and

wherein the control unit is configured to control a setting or an operation of the portable electrical device based on the result of the comparison.

10. The portable electrical device of any preceding embodiment, wherein the first and second sensors comprise capacitive sensors for generating signals depending on the capacity of the nearest object to the front side of the device and/or the nearest object to the rear side of the device,

wherein the processor is configured to compare said first and second signal with each other, and

wherein the control unit is configured to control a setting or an operation of the portable electrical device based on the result of the comparison.

11. The portable electrical device of any preceding embodiment, wherein the first and second sensors comprise density sensors for generating signals depending on the respective densities at the front and/or rear side of the device,

wherein the processor is configured to compare said first and second signal with each other, and

wherein the control unit is configured to control a setting or an operation of the portable electrical device based on the result of the comparison. 12. The portable electrical device of any preceding embodiment, wherein the first and second sensors comprise radar sensors for generating signals depending on the respective densities at the front and/or rear side of the device,

wherein the processor is configured to compare said first and second signal with each other, and

wherein the control unit is configured to control a setting or an operation of the portable electrical device based on the result of the comparison.

13. The portable electrical device of any preceding embodiment, wherein the device comprises at least two pairs of different types of sensors,

wherein the processor is configured to analyze the first and second signals generated by said pairs of sensors, and wherein the control unit is configured to control a setting or an operation of the portable electrical device, based on the results of the analysis.

14. The portable electrical device of embodiment 13, wherein the processor is configured to analyze whether the device is worn at the body of the user, in a bag not at the body of the user or not in a bag/handbag pocket based on the first and second sensor signals of said pairs of sensors, and

to compute differences of the amplitudes of said first and second signals of said pairs of sensors and to compare said differences with a threshold value to decide whether the device is worn at the body of the user, in a bag not at the body of the user or not in a bag.

15. Method for controlling a setting or an operation of a portable electrical device as disclosed in embodiment 1, the method comprising:

- generating a first sensor signal influenced by the environment of said first sensor;

- generating a second sensor signal influenced by the environment of said second sensor;

- analyzing the first and second sensor signals; - controlling a setting or an operation of the portable electrical device, based on the result of the analysis.

16. A computer program comprising computer program means for causing a device as defined in embodiment 1 to carry out the steps of:

- obtaining a first sensor signal influenced by the environment of said first sensor;

- obtaining a second sensor signal influenced by the environment of said second sensor;

- analyzing the first and second sensor signals;

- controlling a setting or an operation of the portable electrical device, based on the result of the analysis.

17. A computer program comprising program code means for causing a device as defined in embodiment 1 to perform the steps of

- obtaining a first sensor signal influenced by the environment of said first sensor;

- obtaining a second sensor signal influenced by the environment of said second sensor;

- analyzing the first and second sensor signals;

- controlling a setting or an operation of the portable electrical device, based on the result of the analysis,

when said computer program is carried out on portable device.