Abstract: In a push-pull switching circuit for a low-voltage, large-current application, it is desired to decrease the resistance of a transformer and of its peripheral circuit. For this purpose, a first coil (35) is wound around a first winding core (31) with respect to as a winding start position a side surface of the first winding core (31) which does not oppose a second winding core (31). A second coil (35) is wound around the second winding core (31), with respect to as a winding start position a side surface of the second winding core (31) which opposes the first winding core (31), in the same winding direction as that of the first coil (35) and in a feeding direction different from that of the first coil (35). The first and second coils are electrically connected in series with each other.

Abstract: A ferrite substrate for thin-film inductors is provided by means of blending raw materials to meet a composition of di-iron trioxide (Fe2O3): 40 to 55 mol %, nickel oxide (NiO): 5 to 35 mol %, zinc oxide (ZnO): 10 to 40 mol %, and bismuth trioxide (Bi2O3): 150 to 750 ppm, or of Fe2O3: 40 to 55 mol %, NiO: 5 to 35 mol %, ZnO: 10 to 40 mol %, cupric oxide (CuO): 5 to 10 mol %, and manganese dioxide (MnO2): 0.5 to 2 mol %, and then molding and sintering the blended material, and applying hot isostatic pressing to the sintered article. A thin-film common mode filter and a thin-film common mode filter array using the ferrite substrate and the manufacturing method of the substrate are also provided.

Abstract: The transformer of a DC to DC converter is constructed as a pair of E-shaped core elements (10, 20) forming a transformer with two outer legs (13, 14) and an inner leg (12) which has approximately half the cross-section of the outer legs. The windings are formed on a support structure with two wire (32, 33) side by side on each outer leg, and two strip windings (see 16, 40) one over the other on the centre leg.

Abstract: An inductance part is provided which includes: a coil which is formed by bending a metal plate into a coil shape; a magnetic body in which the coil is buried; and a short ring which faces the coil.

Abstract: A nail feeding mechanism is provided with a front feed claw (9) and a rear feed claw (10). The rear feed claw (10) is provided with a contact portion (10b) on a front side of a claw portion (10a) . A face of the contact portion (10b) to be brought into contact with connected nails is wider than a gap between nails in a width thereof and cannot enter between nails. When the front feed claw (9) is moved rearward and catches a final nail (TN1) of a first row, the contact portion (10b) and the claw portion (10a) move into a nail path, the contact portion (10b) enters between the final nail (TN1) of the first row and a front nail (FN2) of a second row and the claw portion (10a) enters a rear side of the front nail (FN2) of the second row.

Abstract: An electrical device which comprises first and second laminar electrodes and a laminar PTC resistive element sandwiched between them, the device comprising

Abstract: A heating element (1) having an areal heating resistor (2) and two elongated contact areas (4, 4′), arranged at a distance from each other on the heating resistor (2) with the area (6, 6′) of the heating resistor (2) to be heated essentially between them. The heating element (1) includes at least one standard area (8, 8′) and at least one special area (10) in which the distances (12, 13) of the contact areas (4, 4′) from each other are different The heating element (1) includes at least one barrier area (16, 16′) electrically insulating the standard area (8, 8′) and the special area (10) from each other, and in the special area (10), the electrical conductivity of the heating resistor (2) is different from that of the standard area (8, 8′).

Abstract: A foil-type switching element comprises a first carrier foil having a first electrode arrangement applied thereon and a second carrier foil having a second electrode arrangement applied thereon, said first and second carrier foils being arranged at a certain distance by means of a spacer in such a way that said first and second electrodes face each other in an active area of said switching element. At least said second electrode arrangement comprises a resistive layer which faces said first electrode arrangement. In response to a pressure acting on said switching element said first and second electrode arrangements are pressed together, the shape and/or the size of a mechanical contact surface between said first and second electrode arrangements being given by a mechanical response function depending on the amount of pressure applied. According to the invention, said resistive layer has a shape such that an electrical response function of said sensor is decoupled from said mechanical response function.

Abstract: A security device (1) is disclosed, which permits the controlled access of authorised personnel to vulnerable security regions. According to the invention, the security device (1) is provided with a bus system (3), connecting a central control device to several actuators (4), each of which is allocated to one of the security regions (2). Access authorisation is monitored and controlled by means of a personal identification device (6).

Abstract: An electronic lock that can be used on luggage, baggage, rail cars, trailers or any compartment that can be opened and re-locked. The lock provides tracking of when the lock was opened, where the lock was opened and data relating to the key that was used to open the lock. An input facility on the lock receives programmed data, which is capable of engaging the lock. The programmed data is typically stored on a magnetic card. A detection facility is coupled to the latch mechanism of the lock, and the detection facility detects engagement of the latch mechanism by the card. A memory stores data relating to the programmed data that engaged the latch mechanism. An identifier is mounted in proximity to the latch mechanism that identifies the lock and an output facility outputs data representative of lock activity.

Abstract: A latch, or tag that can be used on luggage, baggage, trunks, rail cars, trailers or any compartment that can be opened and closed that establishes profile data that is associated with the latch or tag and is adapted to store personal data and an identifier in the latch mechanism or on the tag. The profile data can be used to establish a risk factor with the luggage or compartment and/or a person associated with the luggage or compartment.

Abstract: An electronic lock utilizes two microprocessors remote from each other for enhanced security. The first microprocessor is disposed close to an input device such as a keypad, and the second microprocessor is disposed close to the lock mechanism and well protected from external access. The first microprocessor transmits a communication code to the second microprocessor when it receives via the input device an access code that matches a preset access code. The second microprocessor opens the lock if the transmitted communication code matches a preset communication code. The dual-microprocessor arrangement is advantageously used in a voice controlled access control system and in a motorcycle ignition control system. The present invention further provides an electronic access control system which has a master electronic key having a preset number of access, and an electronic alarm system for a bicycle that has a remote control mounted in the helmet of the rider.

Abstract: The present application describes an electronically powered postage stamp or mailing label and including a radio frequency identification (RFID) device and system mounted between the opposing and facing major surfaces thereof. The RFID device and system includes an integrated circuit transceiver chip which is connected to and powered by a thin flat battery cell and is operated with a thin film RF antenna, all of which are mounted in side-by-side relationship on a thin base or support layer. These thin flat components are mounted in an essentially two dimensional planar configuration well suited for incorporation into the planar structure of a postage stamp or a mailing label. In addition, the RFID transceiver chip may be replaced with an electro-optically operated IC chip using, for example, LEDs or laser diodes for the propagation of light signals to an interrogator.

Abstract: The present invention provides a remote communication device (i.e., radio frequency identification (RFID) tag) and system for communicating between one or more RFID tags and a reader using a frequency modulation method to encode binary data.

Abstract: The present invention provides a system and method for communicating between an interrogation device and at least one electronic label device. The system includes an interrogation device for generating an interrogation field using an interrogation signal. The interrogation signal contains angle modulation and amplitude modulation such that the amplitude modulation encodes the interrogation signal with information for communication to one or more of the electronic labels. The angle modulation is controllably varied so that the interrogation signal has a frequency spectrum which includes sidebands having reduced amplitudes. The system also includes one or more electronic labels locatable within the interrogation field and capable of detecting and decoding the interrogation field so as to recover the information.

Abstract: The present publication discloses a method for implementing a remote identification device (RFID). According to the method, a reader device sends a modulated carrier to a remote identification device or a remote sensor (20). According to the invention, a reply signal synchronized with the modulation of the carrier signal received by the remote identification device or remote sensor (20) is generated using the energy of the incident carrier signal.

Abstract: A reusable electronic tag having a plurality of memory locations to allow a user to write information onto the tag. After a memory location is written, it becomes write-protected, preventing the written content from being altered or deleted by an unauthorized user. By granting a user access right to a memory location whether the user has a valid password, it is possible to restrict the user's ability to access the memory location depending on the granted access type and the level of restriction set for the memory location. A user with a valid password is allowed to read and write a memory location. Such a user may be allowed to clear the memory locations so that the tag can be reused.

Abstract: To monitor goods and/or containers a method and a system are proposed that comprises the following components. Each good or container is allocated a transponder on which influence variables on the good or on the container are recorded by means of a sensor means. The transponders are wirelessly connected to each other, e.g. as an ad-hoc network. One of the transponders transmits all of the recorded influence variables to an allocated communication unit. In this way, a system is provided that automatically, and without manual intervention, provides very early detection of impermissible effects on the goods to be stored or transported. In this way, for example, a re-ordering can be activated before the impaired goods are delivered to the intended recipient.

Abstract: The present invention relates to a method and to a device enabling data to be input, and also to an optical system for detecting the position of an article or a member and suitable for being used (or incorporated) in such a method (or device). The technical field of the invention is that of making keyboards and similar devices enabling manual input of data for processing by a digital computer. The method of the invention for determining the position of an article in a zone uses the steps of structuring a neural network by training, applying data to the input of the structured neural network, the data being the result of converting signals delivered by a plurality of detectors sensitive to illumination of said zone, and determining the position of the article in the zone as a function of at least one data item output by the structured neural network.

Abstract: A memory aid device comprising an enclosure, wherein a front panel of said enclosure includes a plurality of portions adapted to accept handwritten erasable indicia; said front panel further including indicator lights wherein respective individual ones of said lights are associated with respective individual ones of said portions.

Abstract: The fiber optic isolator of the present invention transports data signals between high voltage power lines and a communications interface device, bypassing a step down transformer to low voltage power. The communication interface device includes a low voltage power line as well as telecommunications and wireless interfaces. The signals are coupled and de-coupled off of a high voltage power line by a power line coupler. The fiber optic isolator gets the signals (in light form) and transports them to and from the communications interface device. This insulates the system from current flow between the high voltage power lines and the communications interface.

Abstract: This invention relates to a power line communication (PLC) system wherein the power supply line supplies power and also acts as a communications supply line. A receiver is able to detect small changes in the modulated transmitted information and thereby shut down the circuit. The invention is particularly suitable for use where the IEL is remote from the power supply such as, for example, in down hole oil production situations where very long power cables are used.

Abstract: An exciting device capable of producing sound by sound-producing vibration body of a main body of an apparatus is provided. An exciting member 32A thin and long in the direction X is provided on a vibration substrate 31 thin and long in the direction X. Both ends of the exciting member 32A are fixed to the vibration substrate 31. Further, a piezoelectric element 33 that functions as vibration generating means is provided in the middle in the direction X of the exciting member 32A. The vibration substrate 31 is directly or indirectly fixed to the sound-producing vibration body. Vibration of the exciting member 32A is transmitted to the sound-producing vibration body through the vibration substrate 31 so that the sound-producing vibration body produces sound.

Abstract: An electropneumatic acoustic horn is disclosed, comprising an electric compressor unit for generating compressed air and a sound wave generator comprising at least an acoustic chamber associated to at least a volute wound acoustic duct adapted to propagate the produced sound to the outside. Air channelling means put the compressor unit in communication with each acoustic chamber. The compressor unit and the sound wave generator are mechanically connected in a removable way by fitting slidingly a collar.

Abstract: A monitoring system which can monitor a plurality of vehicles (1) includes vibration sensing units (15) each sensing a vibration of the associated vehicle (1), a sensed time specifying unit (20b) which specifies an instant at which the vibration of the vehicle (1) is sensed by the vibration sensing unit, and an abnormality determining unit (20a) which determines, when a vibration of one of the vehicles (1) is sensed by the associated vibration sensing unit (15), whether the vibration is caused by preparations for theft with respect to the vehicle (1) or the vibration is caused by environmental influences on the vehicle (1). The abnormality determining unit (20a) carries out the determination on ground of sensing results obtained by the vibration sensing units (15) of the respective vehicles (1) and a result of specification carried out by the sensed time specifying unit (20b).

Abstract: A host vehicle system includes a lane change system providing an indication to the host vehicle a target vehicle entering a destination lane. The system includes arrays of magneto-resistive sensors on both sides of the vehicle receiving proximity information as a function of magnetic field variations, a vehicle bus receiving various vehicle control signals, a smart algorithm controller analyzing bus signals and sensor signals, and various vehicle collision systems such as passive restraints, optical light guides, and audible warnings operating in response to a threat from a target vehicle.

Abstract: A host vehicle system includes a blind-spot warning system providing an indication to the host vehicle a target vehicle entering a blind-spot. The system includes a vehicle bus receiving various vehicle control signals, magneto-resistive sensors receiving proximity information as a function of magnetic field variations, a smart algorithm controller analyzing bus signals and sensor signals, and various vehicle collision systems such as passive restraints, optical light guides, and audible warnings operating in response to a threat from a target vehicle.

Abstract: In order to assist the driver, future vehicles are being equipped with systems for detecting the surroundings. Such systems serve to provide the driver with advance warning about possible collisions with other participants in traffic, for example, pedestrians. Here, the detection of the information about the surroundings is done, among others, using image sensors and their evaluation via an image processing unit. The evaluation of image data is limited to simple geometric and dynamic models which describe the behavior of participants in traffic. Therefore, an image-processing system is proposed which takes into consideration the attention of other participants in traffic. Especially here, the direction of looking of recognized participants in traffic is detected and, based on the detected direction of looking, a probability is determined for evaluating the risk of collision with other participants in traffic.

Abstract: A tire/wheel assembly abnormality determining apparatus and a method thereof determines whether there is an abnormality in a tire/wheel assembly in a vehicle provided with the tire/wheel assembly constituted by fixing a tire, that is filled with compressed air, to a wheel. The apparatus includes a tire pressure sensor which directly detects an air pressure in the tire as a tire pressure and which outputs a tire pressure signal indicative of the detected tire pressure; and a determining device which determines whether there is a deformation state abnormality, that is an abnormality regarding a deformation state of the tire, in the tire/wheel assembly, based on frequency characteristics of the output tire pressure signal. Therefore, it is possible to accurately determine whether there is an abnormality in the tire/wheel assembly in the vehicle, regardless of fluctuation of a wheel speed.

Abstract: The present invention describes a method and a device for monitoring an operating state of at least one tire of vehicle as a function of the coupling of a trailer to the vehicle. In this context, the operating state of the tire, i.e. the tire state, is particularly monitored for changes. Operation of the vehicle with a trailer causes the distribution of the axle load between the front and rear axles to change in the towing vehicle. This manifests itself in changed slip conditions for the wheels on both the front axle and the rear axle and results in the wheel speeds in trailer operation differing from those in trailerless operation, when the conditions are otherwise the same. Now, the essence of the present invention is to modify the wheel-speed-based monitoring of the tire state on the basis of detecting that the vehicle is being operated with a trailer. This modification allows, e.g. a loss in pressure of a tire to be determined with a better detection accuracy.

Abstract: A communication system for communicating between a tire/wheel assembly and a body of a vehicle of a construction in which the tire/wheel assembly is supported by the vehicle body, has a i) wheel-side communication device that is mounted to the tire/wheel assembly and rotates together with the tire/wheel assembly, and ii) a body-side communication device that is mounted in a fixed position to the vehicle body. The communication system performs communication between the wheel-side communication device and the body-side communication device according to a predetermined rotational position of the tire/wheel assembly.

Abstract: A fluid condition indicating system and method using visual and audible devices. The system includes a circuit having visual and audible indicators, a power supply, and a plurality of switches or sensors. A start switch is coupled to the power supply, the visual indicator, and the audible indicator, and an enable switch is responsive to an ignition signal. During engine starting, the circuit enables the visual indicator in response to a condition of the start switch and a low fluid sensor, and disables the audible indicator. The audible indicator is enabled in response to the condition of the enable switch after engine starting, and may include a transistor or an output of a controller such as a microprocessor. The system may be integrated into a single wiring harness that can be easily replaced or retrofit onto existing outdoor power equipment.

Abstract: A system for automatically deactivating a turn signal displayed on a vehicle, the system including a sensor configured to measure a vehicle turn attribute, and a processing unit in communication with the sensor, wherein the processing unit deactivates the turn signal based on a comparison between the vehicle turn attribute and a predetermined data point referenced by the processing unit.

Abstract: A system for processing alerts receives alerts from managed elements on different specific transport mechanisms. An interpreter converts alerts in different specific formats to a system format. A notifier notifies a user about the alert in a user identified manner. The system is modular in that functions may be added as components which are available to multiple modules. Managed elements may be queried to determine new types of alerts, and the state of an element. Further, multiple events may be correlated to determine the state of an element.

Abstract: A system, method, apparatus, means, and computer program code for muting or disabling audible alarms or alerts during a conference or collaboration event are provided. During the conference or collaboration event, users may participate in the conference via user or client devices (e.g., computers) that are connected to or in communication with a server or collaboration system. A server, collaboration system or other device or application detects the setting of a mute alarm preference regarding one or more users. This may occur prior to a conference or during the conference. The server, collaboration system or other device then may cause the appropriate muting to occur at the appropriate or desired client devices and/or disable or mute audible alarms at one or more of the client devices (120a, 120n, 122a, 122n).

Abstract: A system for monitoring activity includes a detector located in a desired area, such as shower, and a receiver installed in an area remote from the detector, such as a powder room. The detector detects movement in the shower and sends an activation signal to the receiver. The receiver receives the activation signal and sends an alarm indication signal to a signal device. The signal device produces an alarm signal to notify any individual at the remote area that the shower is occupied. The system may also include a detector mounted to a delivery receptacle, such as a mailbox. The detector detects motion in the delivery receptacle and sends a signal to a receiver to activate a signal device. The signal device produces an alarm to notify individuals that the receptacle had been opened.

Abstract: A change detecting apparatus and monitoring system using the apparatus as a notification apparatus. The change detecting apparatus has an input unit receiving a monitor image captured by a pickup unit, a region specification unit specifying N regions (N≧2) in the monitor image, a notification destination specification unit specifying notification destinations of image changes in the monitor image in advance according to the image change characteristics, a change detection unit detecting an image change in the N regions, a characteristics extraction unit extracting a feature of the image change, a monitor information generation unit generating monitor information related to the detected image change and a transmission unit transmitting the monitor information. Based on the detected image change characteristics, the monitor information is transmitted to a notification destination set in the notification destination specification unit.

Abstract: A method and apparatus for analysing a signal from a movement detector for determining if movement has been detected in an area under surveillance, and an anti-theft system” An anti-theft system (1) for a motor vehicle detects movement in the motor vehicle, while at the same time avoiding false alarms. A movement detector (2) comprises a transmitter circuit (3) which transmits a microwave signal in bursts of around six nanoseconds duration and a receiver circuit (4) which receives the transmitted signals and reflected signals. The transmitted and reflected signals are mixed, and envelope detected in an envelope detector (22). The signals from the envelope detector (22) are passed through three filters, namely, a low pass filter (25) which passes low frequency signals in the range of 1 Hz to 40 Hz, a high pass filter (26) which passes high frequency signals of greater than 100 Hz and a band pass filter 15 (27) which passes intermediate frequency signals in the range of 40 Hz to 80 Hz.

Abstract: An ambient condition detector includes a time delay function whereby a user initiates a functionality test of the detector and has time to move away from the vicinity of the detector before a potentially hearing damaging, audible report is issued from the detector under test. Multiple ways to set the time delay interval are included in the various embodiments. The sensors of the ambient condition detector may include fire sensors, smoke sensors, gas sensors, motion sensors, vibration sensors and multiple combinations of these sensors.

Abstract: A satellite tracking system for use with moving objects such as animals is provided for detecting the movement and location of a moving body relative to a positional satellite. A combination transmitter/receiver (transponder) is carried by the animal for receiving and processing signals transmitted from the positional satellite. The transponder includes a satellite data receiver for detecting positional satellite data of a selected characteristic from a signal transmitted by the satellite and a transmitter responsive to the receiver for transmitting selected positional satellite data. A remotely located processing station is responsive to the selected positional satellite data received from the transmitter of the responder. The processing station includes a location detector for determining the location of the animal in response to received satellite positional data from the transmitter of the chip.

Abstract: A wearable, computerized apparatus for use with law enforcement has an evidence collector adapted to collect evidentiary information of a type collected according to law enforcement procedures and useful for identification of a suspect. It further has a safety monitor adapted to collect safety information relating to well-being of an officer. A wireless communications link communicates the evidentiary information and the safety information to a centralized component of a distributed communications system to assist in identifying suspects and dispatching assistance.

Abstract: A personal and/or institutional health and wellness communications system, which may be used for a variety of emergency and non-emergency situations using two-way communication devices and a bi-directional communication network. In one application two-way pagers are adapted for use in the system. In one application cellular devices are adapted for use in the system. In one application an assisted living response center is established using various embodiments of the present personal and/or institutional communications system. The system provides multiple levels of prioritization, authentication of person (task, step, process or order), and confirmation via interrogation of person, device, or related monitor. One embodiment provides a method for receiving, evaluating and responding to calls received from a subscriber, patient, related party, or health care provider or health care system.

Abstract: A combined radio transmitter/receiver apparatus for determining a particular distance between a transmitter and a receiver. The master transmitter unit sends a radio signal to a servant receiver. The servant receiver has a signal receiver which requires no amplification. When a signal is received from the master transmitter, it generates a current activating a comparator, which then triggers a return signal from a transmitter in the servant unit powered by a shielded battery unit. The master transmitter is set to respond either to receipt of a return signal or failure to receive a return signal. In some applications, the master transmitter will sound a warning to a user when there is no receipts of a returned signal. In other applications, the master transmitter will sound a warning to a user when there is receipt of a return signal. Through the use of tuned antennas in the master transmitter and coded return signals, false alarms and false positives are avoided.

Abstract: A container for locally determining a container state using a state device. The state device detects unexpected events by comparing expected event information with actual event information related to a container condition. The container condition includes, for example, environmental conditions, logistical or location conditions, and physical or security conditions. Thus, the container is able to intelligently monitor its state and raise an alert without intervention from a central system. The container can also be programmed and reprogrammed with updated logic, states, and/or expected event information. A sensor in the state device gathers input information for comparison to expected event information. A communication port in the state device receives event information. For example, a GPS (Global Positioning System) receiver can determine a current location for comparison to an expected location at the current time.

Abstract: A security monitoring and enforcement system is provided for monitoring and enforcing control in a secure environment, such as an aircraft. The system includes a security monitoring and enforcement unit (SMEU) (1) having visual surveillance means (2) and audio surveillance and communication means (3). The visual surveillance means (2) is mounted to an enforcement means (4) and house in a ceiling (6) of an aircraft. The SMEU is remotely operated and monitored by remote control means (28) located on the ground. The system is operable continuously or when a security breach is detected. The enforcement means (4) is activated and fired to expel immobilising means (5) to subdue a suspect.

Abstract: A saw cover safety sensing device comprises a protecting cover; a sensing controller at one side of the protecting cover; a control circuit within the sensing controller; the control circuit serving for receiving electric static signals from a human body and emitting control signals; the sensing controller further comprising a power switch, at least one batteries, a plurality of LED lights and a transparent cover; at least one signal sensing wire connected to the sensing controller; each signal sensing wire having a metal foil sheet; one surface of the metal foil sheet being coated with glue so that the metal foil sheets and the signal sensing wires are adhered to the protecting cover; the signal sensing wire and metal foil sheets serving for detecting electric static signals emitted from a human body; and a buzzer connected to the sensing controller; the buzzer buzzes in response to electric static signals.

Abstract: A state where a seal is stuck to an article is detected, and an unauthorized takeout is prevented. A stuck state detection seal comprises a sealing base member to be stuck to the article N and a sealing surface member to be stuck to the sealing base member overlapped thereon. Between the sealing members, there are provided stuck state detection means for detecting a stuck state between the two and an RF unit that transmits a detected stuck state signal and transmits/receives a takeout state signal of the article N. In the store are provided passage reception antennas for receiving the stuck state signal transmitted from the RF unit, gate reception antennas for receiving reading state signal transmitted from a bar code reader through the RF unit, and a store control unit for judging whether the takeout of the article N be permitted based on the reading state signal.

Abstract: A radio frequency identification system comprising a radio reader circuit operable to emit a radio frequency carrier signal modulated with a subcarrier, which has a subcarrier modulation rate. The radio frequency identification tag circuit is operable to extract the subcarrier from the emitted radio frequency carrier signal and the extracted subcarrier then functions as a clock, which operates to assist in the transfer of a modulated backscattered signal to the radio frequency identification reader circuit. The radio frequency identification reader circuit decodes the modulated backscattered signal and the data encoded in the radio frequency identification tag circuit is obtained.

Abstract: The Traveller is a multi-function device to aid blind people in unassisted walking. It provides 4 inter-related functions: (1) A magnetic compass, marked in braille to help a blind person orient himself, or to face and walk in a selected direction. (2) A straight-walker to guide the blind person to walk in a selected direction, using vibrators in the neck-strap at the side of the neck. (3) An obstacle alarm to signal the blind person that an obstacle is ahead at nearer that the pre-selected distance, using a vibrator at the back of the neck. (4) A queue-minder using a vibrator at the back of the neck, to signal the blind person while standing in a queue that the person in front has moved up.

Abstract: A baby monitor has a nursery unit and parent unit. The nursery unit has a controller for generating a privacy code, a microphone for detecting baby sounds and a transmitter for transmitting a signal made up of the privacy code and the baby sounds. The parent unit has a receiver for receiving the signal, a controller for comparing the privacy code to a reference code, and an amplifier and speaker for outputting the baby sounds. The baby sounds are output by the parent unit if the privacy code matches the reference code. The nursery and parent units have a scrambler and descrambler respectively for scrambling the signal.