Abstract: A system for electronic safeguarding against burglary, or for monitoring, having a signal emitter and a receiver for receiving signals from a resonance label if the label is located in the zone of emitted signals. The system is adapted for use in stores, such as department stores, to detect unauthorized removal of items that carry a resonance label. The receiver evaluates the received signals to trigger an alarm signal upon detection by a receiver of a signal from a resonance label. Plural emitter-signal pairs are provided in which the respective emitter signals are wobbled at staggered frequencies within a broad frequency band. The emitter is also operative to emit and inoperative not to emit periodically only during alternating time phases and the receiver evaluates signals received by it for triggering the alarm only during the intervals between the signal emitting state of the emitter.

Abstract: A voice transmission system for a conventional gas mask or face mask includes a body enclosing a microphone, an amplifier assembly and a speaker. The microphone is mounted within a cavity formed in the body, while the amplifier assembly and speaker are mounted within a main compartment of the body. The microphone, amplifier assembly, speaker and a set of batteries are electrically interconnected. The batteries are enclosed within one or more battery compartments in the body. A mounting assembly having a bracket with threaded, resilient segments is also connected to the body. The resilient segments of the bracket are designed to releasably couple the body to the voice emitter passage of the mask without penetration or structural modification of the mask. The voice transmission system is designed to receive a person's voice from a voice diaphragm located in the voice emitter passage of the mask, amplify the voice, and externally transmit the voice through the speaker.

Abstract: A resonance label (1) comprises an insulating support layer (4) having two sides (2, 3). A first conductor is on one side (3) of the insulating supporting layer (4) and forms a capacitor plate (6b) and an induction coil (5) having a number of individual turns spaced apart from each other. A second conductor is on the other side (2) of the insulating supporting layer (4) and forms another capacitor plate (6a) so as to define a resonant circuit. At least one of the first and second conductors includes two adjacent conductor areas (6a, 7d) which are spaced apart at a distance (a) from each other closer to one another than the spacing between the individual turns of the induction coil (5). The distance (a) between the adjacent conductor areas (6a, 7d) defines a desired breakdown point (8) on the respective side (2) of the insulating support layer (4).

Abstract: A multi-test, hand-held instrument and method for testing engine sensors and ignition modules includes a housing enclosing a battery and an electrical circuit. The electrical circuit includes a first test circuit electrically interconnected with said battery for testing potentiometer-type, temperature-type and Hall effect type sensors and ignition modules, a second test circuit electrically interconnected with the battery for testing oxygen, reluctance and knock sensors, and a third test circuit for testing the battery in the instrument. A first switch selects between the first or second test circuits, while a second switch selects between a component testing mode and a battery testing mode. Electrical leads extend outwardly from the housing and are connectable to the engine component being tested.

Abstract: An apparatus for the detection of labels used for preventing theft of goods and provided with an electric resonant circuit [(21) and] having a resonant frequency [(fr)] in the MHz range [comprises] has a transmitter [(1)] and a receiver [(2)]. The transmitter [(1)] generates a transmitting signal sequence, whose frequency is wobbled in wobble cycles over and beyond the given resonant frequency of the labels and [radiates] which is radiated by means of a transmitting antenna [(11)]. Signal generation in the transmitter [(1)] takes place digitally and with coinciding phase position with respect to each wobble cycle. In the receiver [(2)] the signals received by means of a receiving antenna [(12)] are scanned and digitized synchronously with signal generation in the transmitter [(1)]. From the digitized signal values of n wobble cycles a background is formed and subtracted from the digitized signal values of the in each case last wobble cycle.

Abstract: An apparatus for the detection of labels (21) used for preventing the shoplifting of articles (20) and which are provided with an electrical resonant circuit having a resonant frequency in the MHz range, comprises several pairs of transmitting and receiving antennas (8 to 13), which in each case bound passages (5 to 7) to be monitored. The transmitting antennas (8, 10, 12) of the pairs in each case radiate electromagnetic waves, whose frequency is wobbled in wobble cycles over the predetermined resonant frequency of the labels. The wobble cycles of all the pairs are synchronized with one another. To the receiving antenna (9, 11, 13) of each pair is connected a receiving circuit (17 to 19) detecting the presence of a label. For simplifying the installation, the invention proposes that the h.f.-oscillations radiated as electromagnetic waves by means of the transmitting antennas are generated by decentralized h.f.

Abstract: The described device is part of a product theft prevention system and is used for deactivating resonance labels. It is intended for use in combination with a hand-held optoelectronic bar code reader (1), so as to permit the deactivation at the checkout of shops and stores of electronic resonance labels provided with a bar code and attached to products in a single operation and simultaneously with the determination of the bar-coded data. The deactivator has antennas (8, 9), which are located in a casing (11) fixable externally to the front end of the hand-held bar code reader (1) and which are constructed as ferrite antennas. As a result of the housing of the antennas (8, 9) and preferably all the high frequency-carrying parts (14, 15) of the deactivator in a separate casing (11), the deactivator can be used in combination with any random hand-held bar code reader, without any changes having to be made to the latter.

Abstract: A process and circuit device for the deactivation and subsequent proof of a resonance label which has a resonant circuit with a certain Q factor and a certain frequency. The resonant circuit is energized with and disabled by a deactivation energy during deactivation. During deactivation, time is divided into a continuous alternating sequence of first and second time periods which directly follow one another. A transmission antenna transmits a deactivation energy during each of the first periods of time in the form of a sequence of separate deactivation impulses to cause the resonant circuit of the resonance label to oscillate in a resonant mode. The height and the width of each of the deactivation impulses and the number of the deactivation impulses within the impulse sequence are such that the impulse sequence delivers sufficient energy to deactivate the resonance label. The transmission is stopped and the transmission antenna is disabled for each of the second periods of time.

Abstract: A process and circut device for the deactivation and subsequent proof of a resonance label which has a resonant circuit with a certain Q factor and a certain frequency. The resonant circuit is energized with and disabled by a deactivation energy during deactivation. During deactivation, time is divided into a continuous alternating sequence of first and second time periods which directly follow one another. A transmission antenna transmits a deactivation energy during each of the first periods of time in the form of a sequence of separate deactivation impulses to cause the reosnant circuit of the resonance label to oscillate in a resonant mode. The height and the width of each of the deactivation impulses and the number of the deactivation impulses within the impulse sequence are such that the impulse sequence delivers sufficient energy to deactivate the resonance label. The transmission is stopped and the transmission antenna is disabled for each of the second periods of time.

Abstract: A timing analyzer for engine diagnostic testing includes a variable sensitivity knob for testing ignition timing for both a conventional four stroke engine and a DIS four stroke engine. The timing analyzer has a pickup which is adapted to be placed around a lead from a spark plug in the engine. During spark plug firing, a current spike appears in the spark plug lead. The timing analyzer is adapted to be triggered when a current spike above a selected threshold level is detected. When the timing analyzer is triggered, a pulse of light is produced from the nose cone of the analyzer. During engine operation, the spark plugs are continuously being fired, which creates a strobe light effect from the analyzer. The timing analyzer is aimed at timing marks on the engine block, and at a single mark on the rotating flywheel, which permit the engine to be properly timed.

Abstract: The invention provides a combined microphone and amplifier assembly that is releasably connected to the voice emitter passage of a conventional face mask without requiring any penetration or structural modification of the face mask including the voice emitter passage of the mask. The combined microphone and amplifier assembly includes a body mounting and enclosing within a main compartment an amplifier circuit board and a speaker. The body further includes one or more battery compartments having selectively removable covers which afford ready access to the batteries contained within the compartments. Connected to the body is a mounting bracket that facilitates the quick and easy releasable connection of the combined microphone and amplifier assembly to the mask without any penetration or structural modification of the mask being required.

Abstract: An ignition adapter for DIS four stroke engines provides conventional voltage waveforms for a diagnostic oscilloscope. Spark plug leads from a DIS four stroke engine are grouped together depending on their respective firing polarity. A first signal pickup is placed around the spark plug leads from the spark plugs of one signal polarity, for example a positive signal polarity, and a second signal pickup is placed around the spark plug leads from the spark plugs of opposite polarity, for example a negative signal polarity. A trigger pickup is placed around the #1 cylinder spark plug lead. The voltage waveforms received in the signal pickups are applied to the ignition adapter, summed and displayed on the oscilloscope as a conventional voltage waveform. The polarity of the waveform can be reversed using a polarity switch. The waveform received in the trigger pickup is applied to the ignition adapter and compared to a reference voltage.

Abstract: An electronic meter for testing engine parameters includes a slide switch and related circuitry for detecting, scaling and displaying the correct value of engine speed for both a conventional four stroke engine and a DIS four stroke engine, as well as for a two stroke engine. The electronic meter has a pickup which is adapted to be placed around a lead from a spark plug in the engine. The electronic meter is adapted to be triggered when a current spike in the spark plug lead is above a selected threshold value. When the electronic meter is triggered, a voltage pulse is stored in an integrating circuit in the meter. The electronic meter scales the voltage across the integrating circuit, measures the scaled voltage, and displays the value on the meter. The slide switch and associated circuitry for the electronic meter are adapted to vary the threshold level for the trigger, as well as appropirately reduce the output voltage of the integrating circuit, depending on the type of engine being tested.

Abstract: A voice transmission system for a face mask includes a microphone assembly partially received in and threadedly connected to an emitter passage through the mask to position a microphone on the inside of the mask. An amplifier assembly is threaded onto the outer end of the microphone assembly until spring loaded electrical contactors on the amplifier assembly resiliently engage circumferentially continuous contacts on the microphone assembly to complete an electrical circuit between the microphone and the amplifier assembly.

Abstract: A multiple position rotary switch is disclosed for incorporation into an electrical device. The switch comprises an annular cup that serves as a housing for the switch and which receives a knob for rotation therein. The knob is retained within the cup by a circuit board that is removably secured to the cup. The circuit board includes a first major surface having a switching circuit formed thereon and a second major surface. The circuit board is removably secured to the cup by a plurality of barbed ears which extend from the sidewall of the cup such that the first surface of the board is located between the knob and the second surface of the board. The cup includes an upstanding sidewall and a race against which the knob rotates. The race includes a plurality of protrusions which facilitate the retention of the knob in preselected positions as the knob is rotated. The knob comprises a cylindrical disk having on one surface a handle.

Abstract: A novel drive-in traffic control for a bank which includes a computer for controlling the various signs, teller stations, supervisor's desk panel, sensors and a printer and which has provisions for allowing various timing to be varied with a number of control switches. Furthermore, additional teller stations and additional waiting lanes of cars can be added without rewiring the computer terminal and only additional modular wiring units need be added so as to allow additional elements and stations to be added.

Abstract: A system automatically and continuously monitors the performance of separate servomechanisms operating in each of the axes of numerically controlled machine tools to detect when actual machining errors exceed a predetermined maximum due to any malfunction by comparing actual feedback slide velocity, .DELTA.S.sub.2 /T, (as determined by change, .DELTA.S.sub.2, in a feedback position signal, S.sub.2, over a period of time, T) with the commanded system drive velocity, V, (as determined by the difference between commanded position and position feedback signals, S.sub.1 and S.sub.2, respectively, times a gain factor, K). The difference between .DELTA.S.sub.2 /T and K (S.sub.1 -S.sub.2) is machining error which can be used to detect actual error in any axis for alarm or corrective action.