WO2005050253A1 - Detecteur de mouvement dans un appareil electronique equipe d'un dispositif de telecommande - Google Patents

Detecteur de mouvement dans un appareil electronique equipe d'un dispositif de telecommande Download PDF

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Publication number
WO2005050253A1
WO2005050253A1 PCT/IB2004/052303 IB2004052303W WO2005050253A1 WO 2005050253 A1 WO2005050253 A1 WO 2005050253A1 IB 2004052303 W IB2004052303 W IB 2004052303W WO 2005050253 A1 WO2005050253 A1 WO 2005050253A1
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WIPO (PCT)
Prior art keywords
electromagnetic radiation
electronic apparatus
remote control
motion sensor
control signal
Prior art date
Application number
PCT/IB2004/052303
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English (en)
Inventor
Erik De Meersman
Original Assignee
Koninklijke Philips Electronics N.V.
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.)
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Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2005050253A1 publication Critical patent/WO2005050253A1/fr

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/941—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated using an optical detector
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/04—Systems determining the presence of a target
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/9627—Optical touch switches
    • H03K17/9631—Optical touch switches using a light source as part of the switch
    • H03K17/9636—Optical touch switches using a light source as part of the switch using a pulsed light source
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/941—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated using an optical detector
    • H03K2217/94102—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated using an optical detector characterised by the type of activation
    • H03K2217/94108—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated using an optical detector characterised by the type of activation making use of reflection

Definitions

  • the present invention relates to a motion sensor and a method of manufacturing and of operating the same for triggering a response of an electronic apparatus. More specifically, the present invention relates to a motion sensor incorporated in an electronic apparatus adapted to be remote controlled by a remote control signal and a method 5 of manufacturing and of operating the same.
  • motion sensors are widely spread in today's world. Some known examples are the use of motion sensors for safety or comfort e.g. for automatically lighting 10 areas upon motion, for activating alarm systems, for use in speed control systems, for activating a roller stairway, for activating a toilet flush, etc. but also the use of motion sensors in e.g. touch screen applications.
  • Motion sensors typically comprise a signal sender, a signal receiver and a corresponding electronic circuits to drive the signal sender, interpret a signal received by the 15 signal receiver and to trigger a response of an electronic apparatus.
  • the signals used can be of different origin, e.g. electromagnetic, ultrasonic or magnetic, although the use of electromagnetic and more specifically optical signals is most common.
  • the signal sender is not an integrated part of the motion sensor, but is a separate source independent of the motion sensor.
  • An illustration of an application where the signal sender is 20 a separate source is e.g. automated lighting if a person approaches a light source.
  • the person himself acts as signal sender, i.e. the person emits IR radiation due to body heat, and this IR radiation is detected by the signal receiver.
  • the signal sender is incorporated in the motion sensor, emitting e.g. a light pulse that is received either directly by the receiver, or whereby the light pulse is first reflected on an object or a 25 person and is then received by the receiver.
  • the working principle of the motion sensor based on optical signals is similar: the source emits a light pulse, a corresponding light pulse can be detected by the receiver, and a change in time of the received signal is used to trigger an action of an appliance.
  • An example of a motion sensor and the use thereof is described in US-4,141,091. It discloses the use of an input sensor for the automated operating of a flushing device. The motion sensor senses the approach and departure of an object or person and produces control signals indicative of said approach and departure, respectively.
  • a discriminator unit receives and decodes the approach and departure signals to produce a flush control signal which controls a flush valve in the flush system as a result of the occurrence of the departure signal following the occurrence of the approach signal. It could be of interest to apply a motion sensor, e.g. the motion sensor described in US-4,141,091, to consumer electronics systems to activate certain features of the system, e.g. illumination of a local control panel or activation of the complete system.
  • the invention relates to an electronic apparatus able to receive a remote control signal from a remote control device for communication with the apparatus using electromagnetic radiation.
  • the remote control device may be able to control the apparatus but this is not essential.
  • the apparatus comprises an electromagnetic radiation emitting device for emitting electromagnetic radiation, a control signal receiver for receiving signals, e.g. remote control signals from the remote control device and reflected signals, a processing device which is adapted for processing electromagnetic radiation.
  • the processing device furthermore allows to distinguish between radiation received from the remote control device by the control signal receiver and radiation emitted by the electromagnetic radiation emitting device and received by the control signal receiver after reflection. In this way it allows triggering a pre-determined action of the electronic apparatus when the reflected radiation is detected.
  • the processing device may further be adapted for evaluating the intensity of received electromagnetic radiation so as to determine motion in the surrounding of the electronic apparatus.
  • the electronic apparatus may also comprise means for controlling the processing device such as to adjust its sensitivity to motion in the surrounding of the electronic apparatus.
  • the electronic apparatus may comprise means for dynamically adapting the intensity of the electromagnetic radiation emitted by the electromagnetic radiation emitting device to allow detection of the reflected electromagnetic radiation.
  • the electromagnetic radiation used for these systems can be infrared radiation.
  • the processing device for processing the electromagnetic radiation may comprise an automatic gain circuit.
  • the predetermined action upon detection of motion in the surroundings of the electronic apparatus may be illumination of a control panel on the apparatus.
  • the invention also relates to a method for detecting motion in the surrounding of an electronic apparatus able to receive a remote control signal provided by a remote control device using electromagnetic radiation. This method comprises emitting electromagnetic radiation by the- electronic apparatus, receiving electromagnetic radiation at the electronic apparatus, e.g. the radiation comprising a remote control signal and/or electromagnetic radiation emitted from the electronic apparatus and reflected from an object, processing the detected electromagnetic radiation so as to distinguish between a reflected portion of the received electromagnetic radiation and a received remote control signal, and triggering a predetermined action depending on the processed electromagnetic radiation.
  • Triggering a predetermined action may comprise illuminating a control panel.
  • the processing of the electromagnetic radiation may comprise evaluating the intensity of the electromagnetic radiation so as to determine motion in the surrounding of the electronic apparatus. Furthermore, the sensitivity to motion in the surrounding of the electronic apparatus may be adjusted. Furthermore, the intensity of the emitted electromagnetic radiation may be adapted so as to guarantee detection of reflected electromagnetic radiation. It is an advantage of the present invention that a consumer electronics system with motion sensor can be produced with only a limited increase in production complexity and effort. It is another advantage of the present invention that a consumer electronics system with motion sensor can be produced, whereby the motion sensor has a high quality noise suppression without needing to introduce additional noise-reducing features to the electronic apparatus, which furthermore would lead to additional costs.
  • Fig. 1 is a schematic representation of a front view of an electronic apparatus according to an embodiment of the present invention.
  • Fig. 2 is a bloc-schematic representation of a motion sensor according to an embodiment of the present invention.
  • Fig. 3 is a diagrammatic representation of an example of a control signal receiver with processing device that can be used in a motion sensor according to an embodiment of the present invention.
  • Fig. 4 shows a graph of a signal emitted by the electromagnetic radiation emitting source and the signal output of a processing device as a function of time, according to an embodiment of the present invention..
  • Fig. 5 is a schematic representation of a motion sensor according to another embodiment of the present invention.
  • Fig. 6 is a block diagram of the working principle of a motion sensor according to an embodiment of the present invention.
  • first, second, third and the like in the description and in the claims are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein. Moreover, the terms top, bottom, over, under and the like in the description and the claims are used for descriptive purposes and not necessarily for describing relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other orientations than described or illustrated herein. Fig.
  • the electronic apparatus 2 can be any electronic apparatus that is adapted to be controlled by a local or remote control signal from a local or remote control device, respectively, e.g. any consumer electronics controlled by remote control.
  • the apparatus has a receiver capable of receiving signals from a remote device but not necessarily being controlled by such a device. In such a case signals from a remote device can be received and may cause a malfunction if the apparatus does not have the novel and inventive features of the present invention.
  • the electronic apparatus 2 described in this embodiment of the current invention is a television set comprising a display 4. This television set can contain any type of display 4, i.e.
  • the electronic apparatus 2 such as the television set, is adapted to be controlled both by a remote control device or by using a local control panel 6 incorporated in the electronic apparatus 2.
  • the local control panel 6 in the embodiment described comprises several hard buttons 8 and can be illuminated with illumination means 10, e.g. by LEDs. Other type of illumination means 10 can also be used.
  • the electronic apparatus furthermore comprises a control signal receiver 20 and an electromagnetic radiation emitting device 22, whereby electromagnetic radiation emitted by the electromagnetic radiation emitting device 22 has a frequency that is detectable by the control signal receiver 20.
  • the electromagnetic radiation emitting device 22 is preferably selected such that a good match is obtained between the frequency of the electromagnetic radiation emitted by the emitting device 22 and the optimum frequency that can be detected by the control signal receiver 20.
  • the control signal receiver 20 is typically an infrared signal receiver and the electromagnetic radiation emitting device 22, for example a light source, can be an LED emitting infrared light with a frequency adapted to the infrared signal receiver.
  • the electromagnetic radiation emitting device 22, the control signal receiver 20 and the processing means (not shown in Fig. 1) to process received electromagnetic radiation form the basis of the motion sensor, according to the present invention.
  • a motion sensor control panel 24 allows control of the properties of the motion sensor. Fig.
  • the second shows a schematic representation of a motion sensor 30 according to another embodiment of the present invention. It shows the electromagnetic radiation emitting device 22 for emitting electromagnetic radiation.
  • the electromagnetic radiation emitting device 22 is driven by a first processor 32.
  • the first processor 32 may be a microprocessor.
  • the first processor 32 may also be a programmable gate array such as a Programmable Logic Array (PLA) or a Programmable Array Logic (PAL) or a Field Programmable Gate Array (FPGA) or similar.
  • PPA Programmable Logic Array
  • PAL Programmable Array Logic
  • FPGA Field Programmable Gate Array
  • Fig. 2 furthermore shows the control signal receiver 20 connected to a second processor 34.
  • the second processor 34 may be a microprocessor or a programmable gate array such as a Programmable Logic Array (PLA) or a Programmable Array Logic (PAL) or a Field
  • the intensity of the electromagnetic radiation emitted by the electromagnetic radiation emitting device 22 should be adapted such that its reflection can be easily detected by the control signal receiver 20.
  • the emission intensity can be a predetermined emission intensity value, determined during design and production of the electronic apparatus 2 with integrated motion sensor 30.
  • the type of control signal receiver 20 used depends on the electronic apparatus and its remote controlling system, i.e. this can be a remote control signal receiver 20 which is used in the standard production of the electronic apparatus without motion sensor, or it can in principle be any type of control signal receiver 20 available.
  • the control signal receiver 20 according to the current invention can receive both signals of a remote control device (not shown in Fig. 2) e.g.
  • the processing of electromagnetic radiation, detected with the control signal receiver 20, by the second processor 34, should allow to distinguish whether the received electromagnetic radiation originates from a remote control device, whether the electromagnetic radiation is a disturbing interference signal or whether the electromagnetic radiation is the reflected electromagnetic radiation originating from the electromagnetic radiation emitting device 22 of the electronic apparatus 2 itself.
  • the signal is originating from the reflection of electromagnetic radiation emitted by the electromagnetic radiation emitting device 22 of the electronic apparatus 2, it should allow to distinguish whether the signal is influenced by an approaching or departing person or object.
  • Evaluation of the output signal of the second processor 34 allows triggering of a predetermined action.
  • the second processor 34 can implement any circuit allowing to evaluate the intensity of the received electromagnetic radiation. An example of such a circuit is an automatic gain circuit.
  • the output signal of the second processor 34 is fed to a processing device 40 for controlling operation of the electronic apparatus 2.
  • processing device 40 may comprise different circuits, depending on the type of apparatus 2.
  • integration of a motion sensor 30 according to the present invention in a consumer electronics apparatus adapted for infrared remote controlling is discussed.
  • the electromagnetic radiation emitting device 22 can be a LED situated at the front panel of the electronic apparatus 2, e.g. at the front panel of a television set or any other suitable light source.
  • the use of LEDs is advantageous as these are relatively simple radiation emitting devices 22, thus improving the ease of production and diminishing the costs of production of the consumer electronics apparatus with incorporated motion sensor 30. Furthermore, it is important to have a stable light source, not suffering too much from ageing effects.
  • the electromagnetic radiation emitting device 22, e.g. LED emits at a frequency which is detectable by the control signal receiver 20.
  • Infrared (IR) remote control devices often function at frequencies between 20 kHz and 100kHz. Typical carrier frequencies for the most common data formats of IR remote controls are 30.3kHz, 33kHz, 36 kHz, 36.7 kHz, 38 kHz, 40 kHz, 44kHz or 56 kHz.
  • the IR signal emitted by the LED therefore preferably has one of these frequencies, in agreement with a corresponding infrared remote control signal receiver 20. Nevertheless, in other embodiments of the present invention, other frequencies, detectable by the control signal receiver 20, can also be used. In the case of LEDs in consumer electronics, the emission intensity should be sufficient to allow the proximity sensor to work at a distance up to several meter, preferably up to 2 meter.
  • the control signal receiver 20 can be any infrared remote control signal receiver 20 available. These are often based on photodiodes, like in TSOP (Thin Small Outline Package) type receivers, i.e. a type of photo modules for remote control systems produced e.g. by Vishay Telefunken.
  • the infrared remote control signal receiver 20 is then connected to a second processor 34, allowing to distinguish the type of signal received, i.e. either a signal of the remote control device or an interference signal or a reflection of the signal emitted by the infrared radiation emitting device 22 installed at the consumer electronics apparatus, possibly influenced by an approaching or departing person or object.
  • TSOP Thin Small Outline Package
  • control signal receiver 20 comprises an automatic gain circuit 50 as illustrated in Fig. 3 or whereby the control signal receiver 20 is connected to an automatic gain circuit 50.
  • the automatic gain circuit 50 was originally added to reduce the noise and interference signals, but can, in the current invention, also be used to distinguish between signals coming from a remote control device or reflected signals originally emitted by the radiation emitting device 22. Furthermore it allows to distinguish whether a change in the reflected signals originally emitted by the emitting device 22 can be detected, i.e. whether the reflected signals are influenced by an approaching or departing person or object.
  • electronic apparatus 2 i.e.
  • FIG. 3 shows a schematic block representation of an embodiment of a control signal receiver 20, showing a detector 52, which can be a photodiode with a typical diameter of a few millimetre, a preamplifier 54 and an automatic gain circuit 50, originally introduced for reducing interference signals.
  • This automatic gain circuit 50 can comprise a controlled gain amplifier 56, a bandpass filter 58, an automatic gain control 60, an automatic threshold control 62 and an integrator and Schmitt Trigger 64.
  • the controlled gain amplifier 56 amplifies the voltage signal corresponding to an amount of electromagnetic radiation captured by the detector 52. It generates most of the voltage gain of the whole circuitry whereby the amplification is controlled by the automatic gain control 60.
  • the gain variation of this amplifier 56 typically is about 50dB.
  • the bandpass filter 58 basically consists of integrated components and allows to select frequencies near a selected mid-frequency, while reducing frequencies that are further away from the selected mid-frequency. For infrared remote control signal receivers, the selected mid-frequency lays typically between 20kHz and 60kHz. The selected mid-frequency is preferably tuned during the production process.
  • the automatic gain control 60 is used to further support the interference suppression of the detector 52.
  • the time constant of this automatic gain control 60 is chosen to be sufficiently large in order to avoid a considerable sensitivity decrease during transmission. It does not react to the useful signal, but it reduces the sensitivity in cases of disturbance.
  • the automatic threshold control 62 reduces the sensitivity of the demodulator to establish the highest possible signal-to-noise ratio according to the signal strength. This is performed only if the output voltage exceeds a certain threshold voltage.
  • the integrator 64 is triggered when the signal reaches the above mentioned threshold. It typically needs several cycles of reaching a signal above threshold in the automatic threshold control 62 before the integrator is loaded and an output is triggered via the Schmitt Trigger.
  • the integrator and Schmitt Trigger 64 preferably guarantee a certain minimum output pulse width, thereby avoiding feed-through of short disturbances or spikes of the output.
  • the effect of these means is that depending on the intensity of the electromagnetic radiation received by the control signal receiver 20, the signal is delayed for a certain period between initial input signal I in the automatic gain circuit 50 and the resulting output signal O of the automatic gain circuit 50. Evaluation of the delay for the signal thus allows evaluation of the intensity of the received electromagnetic radiation and consequently allows triggering of a predetermined action.
  • the evaluation of the delay is used as a specific feature of the motion sensor 30. Fig.
  • FIG. 4 shows the output signal 72 of the control signal receiver 20 and the signal 70 of the radiation emitting device 22 as a function of time.
  • the timing of the signal 70 emitted by the radiation emitting device 22 corresponds with the timing of the signal at the entrance of the automatic gain circuit 50, as the delay is nearly completely caused by the automatic gain circuit 50.
  • the delay t R c, between the originally emitted signal 70 by the emitting device 22 and the output signal 72 of the automatic gain circuit 50, is a measure for the original signal intensity and thus is used to evaluate signals and detect motion.
  • An advantage of this embodiment is that, due to using the conventional remote control signal receiver as part of the motion sensor 30 according to the present invention, the control signal receiver is used at the same time for remote controlling the electronic apparatus 2, e.g.
  • the electromagnetic radiation emitting device 22 emits electromagnetic radiation pulses at regular intervals.
  • the frequency of the emitted electromagnetic radiation is preferably such that it corresponds with the optimum frequency for detection by the control signal receiver 20.
  • the frequency of the electromagnetic radiation pulses emitted by the electromagnetic radiation emitting device 22 is up to 10 pulses per second.
  • the control signal receiver 20 receives a signal within a predetermined time period. This signal can either originate from the remote control device, e.g. if somebody wants to increase the loudness of a sound, or from reflection of the emitted electromagnetic radiation emanating from the electromagnetic radiation emitting device 22 or from other unwanted interfering electromagnetic radiation.
  • the received signal is then evaluated by the second processor 34 and an output signal is created by the second processor 34. This output signal is characteristic for the intensity of the electromagnetic radiation of the proper frequency and thus can be used to evaluate the origin of the received signal.
  • this signal can be either proportional or inverse proportional to the intensity of the received electromagnetic radiation of the proper frequency.
  • the delay between the input signal and the output signal of the automatic gain circuit 50 is used for evaluating the intensity of the received electromagnetic radiation of the proper frequency. In this case an intense received electromagnetic radiation will lead to a short delay signal S, while a weak received electromagnetic radiation will lead to a longer delay signal S. Consequently, the delay signal S is inverse proportional to the intensity of the received electromagnetic radiation of the proper frequency.
  • the different steps in the evaluation process of the received electromagnetic radiation will further be described for a motion sensor 30 having an automatic gain circuit 50 for evaluating.
  • the control signal receiver 20 When the control signal receiver 20 receives electromagnetic radiation from a remote control device, the incoming intensity received by the control signal receiver 20 will be strong, leading to a small delay signal S.
  • the received electromagnetic radiation from the remote control device is significantly stronger than the reflected electromagnetic radiation signal from the motion sensor 30. This guarantees that the remote control functions have priority over the functions corresponding to signals of the motion sensor 30, e.g. an illumination function of the motion control sensor control panel 24 according to the present invention, or in other words that the remote control functions for the electronic apparatus 2 are not disturbed by the additional functions in accordance with the present invention.
  • Detection of such a signal emanating from a remote control device will lead to performing an action in correspondence with the function of the button pressed on the remote control device. If the signal received by the control signal receiver 20 emanates from the reflection by the surroundings of the electronic apparatus 2 of an electromagnetic radiation pulse emitted by the electromagnetic radiation emitting device 22, the delay signal S between input and output signals of the automatic gain circuit 50 will, within error margins, correspond with a predetermined delay corresponding to the intensity of the reflected electromagnetic radiation if reflection is only caused by the surroundings.
  • the received signal corresponds with the reflection of the emitted electromagnetic radiation pulse reflected by both the surroundings and a person or object in the neighbourhood of the electronic apparatus 2
  • the received electromagnetic radiation intensity will be larger than in the case of reflection by the surroundings only, but still significantly smaller than the intensity of a signal originating from the remote control device.
  • the corresponding delay signal S in case of a signal being received which is emanating from reflection by surroundings and an object in the neighbourhood of the electronic apparatus 2 will therefore be smaller than the delay in case the signal received is emanating from reflection by surroundings only, but significantly larger than the delay in case the signal received is emanating from the remote control device.
  • a predetermined action is triggered.
  • This can e.g. be the illumination of the motion sensor control panel 24 of the electronic apparatus 2.
  • the determination of the basic value corresponding to the signal obtained by reception of electromagnetic radiation after reflection by the surroundings can be done during fabrication of the electronic apparatus 2. As in this case only average values for the reflection of the average surrounding can be used, it is more preferred to determine the basic value obtained by reflection of the electromagnetic radiation by the surroundings in a calibration procedure during set-up of the electronic apparatus 2.
  • Such a calibration procedure may comprise the following steps: Step A: tuning the motion sensor 30 in calibration mode.
  • Step B fine tuning a pre-set value for the predetermined output signal value using a rotational button on the motion sensor 30 such that the threshold for motion sensor functions is just not reached at large distances. This can be obtained in a trial and error procedure. This fine-tuning is performed to match the output signal with the amount of reflected electromagnetic radiation that is received due to the reflection of the surroundings and thus this will be determined by the actual surroundings of the electronic apparatus 2.
  • Step C returning the motion sensor 30 to normal operation. An additional advantage is obtained if the sensitivity of the motion sensor 30 can be adjusted to the preferences of the user. Depending on the position of the electronic apparatus 2, the user can decide that it is better that the predetermined motion sensor control feature, e.g.
  • illumination of the motion sensor control panel 24 is performed when approaching at a distance closer than e.g. 0.5 m, whereas in other conditions this may be e.g. when a user approaches the electronic apparatus 2 at a distance of e.g. 2.0 m.
  • the sensitivity of the motion sensor 30 can be controlled by changing the threshold for exceeding the predetermined output signal value upon which a predetermined feature would be triggered.
  • This feature can be introduced electronically and a corresponding rotational button can be foreseen on the motion sensor control panel 24. In this way the user can select the ideal distance upon which the predetermined feature is performed. This avoids unnecessary activation of a motion sensor control feature if the electronic apparatus 2, e.g. the television, is close to an often used pathway in the house.
  • the motion sensor 30 in this embodiment comprises the same components as the motion sensor 30 of the above embodiment, and these components are not described in further detail. Furthermore, the motion sensor 30 according to this embodiment comprises a power control 100, connected to the electromagnetic radiation emitting device 22. As the intensity of the reflected electromagnetic radiation by the surroundings is determined by the objects in the surroundings of the electronic apparatus 2, and as this surroundings can be subject to repeated changes during the lifetime of the electronic apparatus 2, it is not optimal to use a predetermined emission intensity for the electromagnetic radiation emitted by the emitting device 22: if e.g. the predetermined output signal is determined in a calibration step during the set-up of the electronic apparatus 2, it would need re-calibration every time the surrounding changes.
  • the current embodiment solves this problem by automatically adjusting the intensity of emitted electromagnetic radiation, depending on the amount of reflected intensity that is received by the control signal receiver 20. This is used to guarantee at least a small amount of reflection in every steady state situation. It is e.g. possible that a strong electromagnetic radiation absorbing object is placed in the neighbourhood of the electronic apparatus 2. In this way the amount of reflected electromagnetic radiation can be strongly reduced.
  • the predetermined value is adjusted automatically in the following way. Upon a significant change of the surroundings, the second processor 34 will create an output signal that differs from the predetermined output signal. The system will initially perform the appropriate action, i.e. the predetermined feature will be performed if the output signal corresponds with an increase in received reflected electromagnetic radiation.
  • the changed output signal will at the same time be stored and the motion sensor 30 will control whether the changed output system is constant for a long time. If this is the case, this probably points to a changed configuration of the surroundings, e.g. an object introduced into the surrounding of the electronic apparatus 2, rather than e.g. the approach of a person or object.
  • the power control 100 is then triggered to automatically adjust the intensity of electromagnetic radiation emitted by the electromagnetic radiation emitting device. This adjustment is performed so that the original predetermined output value of the second processor 34 for steady state situations is obtained again.
  • the increase of the emission intensity of the electromagnetic radiation is limited, to avoid destruction of the electromagnetic radiation emitting device 22. If the maximum emission intensity is reached, the user optionally is alerted by an alerting means, e.g.
  • a further improvement of the above embodiment can be obtained if the output signal of the second processor 34 is not compared to a fixed pre-determined value, but if the output signals are continuously compared to the values of the output signal during the previous detection. Although in most cases the second processor 34 already contains means to reduce possible effects of interference, e.g.
  • the second processor 34 is an automatic gain circuit 50, it may be preferable to compare with an average of a few of the previous detected output signals instead of a single, e.g. the last, detected output signal.
  • This embodiment has the advantage that the distinction between an approaching or departing person or object and a change in the local surrounding of the electronic apparatus 2 can be performed earlier, in this way avoiding or shortening the time a possible wrong action is performed, i.e. example given the illumination of the motion sensor control panel 24 instead of the adjustment of the intensity of the electromagnetic radiation.
  • instantaneous changes of the reflected intensity are detected and a correct appropriate action can be performed instantaneously.
  • this embodiment allows automatic adaptation to small changes over a long period of time, e.g.
  • Fig. 6 illustrates a method 200 of operating a motion sensor according to an embodiment of the present invention, using the example of a consumer electronics apparatus 2 having infrared remote control, an automatic gain circuit 50 replacing the second microprocessor 34 and a power control 100.
  • a first step 202 the functioning of the motion sensor 30 is initiated upon connecting the electronic apparatus 2 to the power net and putting a motion sensor feature switch in the correct position.
  • the motion sensor feature switch allows a customer to choose whether the motion sensor 30 is activated or not. In principle, this is only performed during installation of the electronic apparatus 2 or if the customer decides to change the activation condition of the motion sensor feature. In normal operation conditions, if the customer has decided to activate the motion sensor feature, the motion sensor 30 is initiated from the moment the electronic apparatus 2 is connected to the power net. Once the system is initiated, the motion sensor 30 switches to normal operation and the electromagnetic radiation emitting device 22, e.g. an IR LED, emits an electromagnetic pulse, e.g.
  • the electromagnetic radiation emitting device 22 e.g. an IR LED
  • step 204 it is checked whether the control signal receiver 20 receives emission within a predetermined time period. If this is the case, this signal will be further processed and method 200 continues to step 208. If not, an erroneous condition has occurred and method 200 continues to step 228.
  • decision step 208 it is checked whether the output signal from the automatic gain circuit 50, i.e. the delay between sending and receiving a signal, is smaller than a predetermined value Dl . If this is the case, the output signal corresponds with a signal originating from a remote control device and method 200 proceeds to step 220 wherein an appropriate action is performed in accordance with the command given on the remote control device.
  • step 210 it is determined whether the delay is shorter than a predetermined value D2 - ⁇ , i.e. corresponding with the combination of the pre-set value of the output signal of the automatic gain circuit 50 due to reflection of the surroundings and a pre-determined threshold difference value ⁇ . If the delay is shorter than D2 - ⁇ , the signal originates from reflection on a person approaching the electronic apparatus 2 and the method proceeds to step 222 wherein a predetermined action is performed, e.g. the illumination of a local control panel 6. If this is not the case, method 200 proceeds to step 212. In step 212 the delay of the output signal is further evaluated.
  • a predetermined value D2 - ⁇ i.e. corresponding with the combination of the pre-set value of the output signal of the automatic gain circuit 50 due to reflection of the surroundings and a pre-determined threshold difference value ⁇ . If the delay is shorter than D2 - ⁇ , the signal originates from reflection on a person approaching the electronic apparatus 2 and the method proceeds to step 222 wherein a
  • step 224 If the output signal equals within certain error margins a pre-determined threshold value, the signal originates from reflection of the surroundings in the steady state situation and the method 200 proceeds to step 224. If the output signal is lower than a predetermined threshold value, method 200 proceeds to step 214. In step 214, it is checked whether the signal has changed only recently or whether the signal differs from the predetermined threshold value already for a longer time. This is performed by comparing with values of the output signal stored during detection steps ⁇ t time ago. If the change occurred only recently, method 200 proceeds to step 216. If the change occurs already for a time longer then ⁇ t, the change is probably created by a changed surrounding so the intensity of the emission will be adjusted. Method 200 then proceeds to step 226.
  • step 216 the output signal is stored for comparison with future values of the output signal. This can be used to detect whether the system is not operating correct or, in some embodiments, to distinguish whether the change in signal stems from a departing or approaching person.
  • Method 200 then continues to step 218 wherein the detector 52 is refreshed and a new detection is performed In step 218 the detector is refreshed and a new detection cycle is performed.
  • an appropriate action corresponding with the function activated on the remote control device is performed. The method then proceeds to step 218 to refresh the measurement.
  • step 222 a predetermined action is performed in accordance with the detection of motion. This can be the illumination of the local control panel 10 on the electronic apparatus 2.
  • Method 200 then proceeds to step 214.
  • step 224 and 226 all previous actions are cancelled, i.e. either after a person has departed or before adjustment of the emission intensity after an incorrect operation of the motion detector 30 has been detected.
  • step 228 the emission intensity is adjusted and method 200 proceeds to step 216.
  • the steps of the adjustment procedure wherein the emission intensity reaches its maximum and wherein the user is alerted of a failure of the motion sensor 30 or a blocking object in front of the signal receiver, are not shown in Fig. 6.
  • the present invention is not limited to televisions, but includes all electronic apparatus that are adapted for remote controlling, including radio systems, HIFI-systems, video players, DVD players, coffee-makers ....

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Selective Calling Equipment (AREA)

Abstract

L'invention concerne un détecteur de mouvement (30) simple intégré dans un appareil électronique (2) équipé d'un dispositif de télécommande. Cet appareil électronique (2) émet un rayonnement électromagnétique d'une fréquence identique à un signal émanant d'un dispositif de télécommande. Le rayonnement électromagnétique émis est réfléchi, par exemple par le milieu environnant ou bien par une personne ou un objet s'approchant de l'appareil électronique (2), à la suite de quoi le rayonnement électromagnétique réfléchi est détecté par un récepteur de signaux de commande (20). Un dispositif de traitement (34) effectue le traitement du rayonnement électromagnétique reçu. Si un changement est observé, une action prédéterminée de l'appareil électronique (2) est déclenchée. On peut trouver une illustration de ce dispositif dans l'éclairage automatisé d'un panneau local de commande (10) d'un poste de télévision dès que l'on s'en approche.
PCT/IB2004/052303 2003-11-18 2004-11-04 Detecteur de mouvement dans un appareil electronique equipe d'un dispositif de telecommande WO2005050253A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03104241 2003-11-18
EP03104241.9 2003-11-18

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Publication Number Publication Date
WO2005050253A1 true WO2005050253A1 (fr) 2005-06-02

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007006329A1 (fr) * 2005-07-13 2007-01-18 Sca Hygiene Products Ab Disposition de capteurs de distributeur automatique
WO2007006330A1 (fr) 2005-07-13 2007-01-18 Sca Hygiene Products Ab Distributeur automatique avec disposition de capteur
WO2007006331A1 (fr) * 2005-07-13 2007-01-18 Sca Hygiene Products Ab Distributeur automatique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3229359A1 (de) * 1982-08-06 1984-04-12 Standard Elektrik Lorenz Ag, 7000 Stuttgart Drahtlos fernbedienbares geraet der unterhaltungselektronik
US4831448A (en) * 1986-11-07 1989-05-16 Goldstar Co., Ltd. Viewing distance sensor for television receiver
US4835614A (en) * 1986-10-31 1989-05-30 Goldstar Co., Ltd. Control method for limiting watching distance in television
EP0332045A2 (fr) * 1988-03-08 1989-09-13 Hansa Metallwerke Ag Appareil de commande sans contact d'installations sanitaires
GB2294606A (en) * 1994-10-19 1996-05-01 Benny Bahman Elmi Television Proximity Detector
US5686942A (en) * 1994-12-01 1997-11-11 National Semiconductor Corporation Remote computer input system which detects point source on operator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3229359A1 (de) * 1982-08-06 1984-04-12 Standard Elektrik Lorenz Ag, 7000 Stuttgart Drahtlos fernbedienbares geraet der unterhaltungselektronik
US4835614A (en) * 1986-10-31 1989-05-30 Goldstar Co., Ltd. Control method for limiting watching distance in television
US4831448A (en) * 1986-11-07 1989-05-16 Goldstar Co., Ltd. Viewing distance sensor for television receiver
EP0332045A2 (fr) * 1988-03-08 1989-09-13 Hansa Metallwerke Ag Appareil de commande sans contact d'installations sanitaires
GB2294606A (en) * 1994-10-19 1996-05-01 Benny Bahman Elmi Television Proximity Detector
US5686942A (en) * 1994-12-01 1997-11-11 National Semiconductor Corporation Remote computer input system which detects point source on operator

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007006329A1 (fr) * 2005-07-13 2007-01-18 Sca Hygiene Products Ab Disposition de capteurs de distributeur automatique
WO2007006330A1 (fr) 2005-07-13 2007-01-18 Sca Hygiene Products Ab Distributeur automatique avec disposition de capteur
WO2007006331A1 (fr) * 2005-07-13 2007-01-18 Sca Hygiene Products Ab Distributeur automatique
US7554084B2 (en) 2005-07-13 2009-06-30 Sca Hygiene Products Ab Automated dispenser
AU2005334399B2 (en) * 2005-07-13 2010-05-13 Sca Hygiene Products Ab Automated dispenser sensor arrangement
US7795584B2 (en) 2005-07-13 2010-09-14 Sca Hygiene Products Ab Automated dispenser with sensor arrangement
AU2005334400B2 (en) * 2005-07-13 2010-09-30 Sca Hygiene Products Ab Automated dispenser with sensor arrangement
US8796624B2 (en) 2005-07-13 2014-08-05 Sca Hygiene Products Ab Automated dispenser sensor arrangement

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