Abstract: The invention relates to an antenna system for electromagnetic waves in a microwave range. At least one directional antenna such as a Vivaldi antenna and/or an omnidirectional antenna such as a dipole antenna, with at least one central unit including at least one active member which is connectible with at least one reception/transmission system is disclosed. To make the system more flexible, the plugged-in antenna is capacitively coupled to at least one motherboard of the central unit and a booster module, an attenuation module, a calibration module, a combiner module, a filter module, or a passive module is optionally pluggable in the central unit to provide a pluggable module. The functionality of the central unit is determined based on the plugged-in module.

Abstract: An earphone is provided that can decrease a time delay between a microphone and a loudspeaker. The earphone includes a microphone incorporated with the membrane of loudspeaker. The loudspeaker and the microphone are connected by connection lines to an electronic circuit.

Abstract: The present invention relates to a drip control device for a boom microphone for installation around the boom at a distance from the microphone. To improve the dripping off beads of perspiration, the drip control device as measured in the direction of the boom, has a length (L) and as measured in the direction perpendicular to the boom, a length (D) and that with respect to ratio of these dimensions, such a ratio L/D is greater than 1.

Abstract: The invention relates to an antenna system for electromagnetic waves in a microwave range. At least one directional antenna such as a Vivaldi antenna and/or an omnidirectional antenna such as a dipole antenna, with at least one central unit including at least one active member which is connectible with at least one reception/transmission system is disclosed. To make the system more flexible, the plugged-in antenna is capacitively coupled to at least one motherboard of the central unit and a booster module, an attenuation module, a calibration module, a combiner module, a filter module, or a passive module is optionally pluggable in the central unit to provide a pluggable module. The functionality of the central unit is determined based on the plugged-in module.

Abstract: A method of packet loss concealment in an adaptive differential pulse-code modulation (ADPCM) codec with a packet loss compensation (PLC) circuit is provided. The method provides a predetermined transition period between a correct signal (xdec) and a substitute signal (xPLC) and a difference (dPLC,m) between the substitute signal (xPLC,m) and a computed prediction signal (xpred,m) is combined with a dequantized prediction error (ddec,m) to receive a dequantized combined prediction error (dcomb,m) which is added to a predicted signal (xpred,m,) to provide a combined transition signal (xcomb,m) as basis for an output signal (xout?xcomb) during the predetermined transition period for adapting all decoder parameters.

Abstract: A directional coupler including at least two coupled lines and at least three ports is disclosed. A first coupled line of the at least two coupled lines includes at least two ports such as an input port and an output port. A second coupled line of the at least two coupled lines includes a forward path and a backward path that are joined together at a third port to form a loop. To achieve a constant coupling attenuation over a broad frequency band and to minimize dimensions, the second coupled line includes a higher line impedance than the first coupled line, at least two times higher, and a coupling resistor is connected in series either in the forward path or in the backward path. In a multichannel power splitter, directional couplers are arranged in series with one another.

Abstract: A noise reducing sound reproduction system and method is disclosed, in which an input signal is supplied to a loudspeaker by which it is acoustically radiated. The signal radiated by the loudspeaker is received by a microphone that is acoustically coupled to the loudspeaker via a secondary path and that provides a microphone output signal. The microphone output signal may be subtracted from a useful-signal to generate a filter input signal. The filter input signal may be filtered in an active noise reduction filter to generate an error signal. The useful-signal may be subtracted from the error signal to generate the loudspeaker input signal, and the useful-signal may be filtered by one or more low-pass filters prior to subtraction from the microphone output signal.

Abstract: The invention concerns an antenna system of a radio microphone that includes an antenna path starting at an in port and ending at an out port along with an amplifier and a radio frequency (RF) cable. In order to compensate for various cable attenuations, an attenuator is provided in series with a variable slope compensator between the amplifier and the RF cable. In order to avoid a negative effect on a large signal behavior of variable slope compensators, field effect transistors (FETs) or pin diodes are used for switching of the resistances so that a large signal behavior is achieved.

Abstract: The disclosed active noise suppression headphone system is directed to a headphone system that is capable of substantially suppressing high or low frequency interfering noise that penetrate through a headphone earpiece from multiple directions. An external microphone mounted with a housing of a headphone earpiece senses ambient noise outside of the earpiece. The sensed ambient noise may be processed through at least one parallel filter bank arranged in at least one headphone earpiece. Each parallel filter bank may include adaptively linked filters. The output of these filters may be amplified based on weighting factors that are dependent upon the sensed ambient noise and that are generated by a filtered x least mean square circuit. The amplified filtered outputs may be summed to generate an antinoise signal that is in input to a loudspeaker within the headphone earpiece that substantial suppresses the ambient noise before it can be perceived by an end user of the headphones.

Abstract: The disclosed active noise suppression headphone system is directed to a headphone system that is capable of substantially suppressing high or low frequency interfering noise that penetrate through a headphone earpiece from multiple directions. An external microphone mounted with a housing of a headphone earpiece senses ambient noise outside of the earpiece. The sensed ambient noise may be processed through at least one parallel filter bank arranged in at least one headphone earpiece. Each parallel filter bank may include adaptively linked filters. The output of these filters may be amplified based on weighting factors that are dependent upon the sensed ambient noise and that are generated by a filtered x least mean square circuit. The amplified filtered outputs may be summed to generate an antinoise signal that is in input to a loudspeaker within the headphone earpiece that substantial suppresses the ambient noise before it can be perceived by an end user of the headphones.

Abstract: The invention relates to a plug earphone with a front portion and a rear portion, wherein a flexible plug can be placed on the front portion which includes an outer portion and an inner portion. An electroacoustic transducer is arranged in the rear portion, wherein the front portion is positioned on the electroacoustic transducer and on an opening of the rear portion produced in this area. To achieve a reliable acoustic friction piece which is easy to manufacture, the front portion, and optionally an inner portion and an outer portion, together with a front wall of the rear portion, forms at least one radial channel leading from the interior of the front portion to the outside, and an acoustic friction piece is optionally arranged in the radial channel.

Abstract: A microphone filter system for outputting an audio signal independent of electrical impedance of downstream devices. This system may include a filter section and an audio transformer that facilitate the outputting of the audio signal.