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: 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: A microphone arrangement includes multiple pressure gradient transducers having an acoustic center, a first sound inlet opening leading to a front of a diaphragm, and a second sound inlet opening leading the back of the diaphragm. A directional characteristic of the pressure gradient transducers includes an omni portion and a figure-eight portion. The pressure gradient transducers have a direction of maximum sensitivity in a main direction. Each main direction of the pressure gradient transducers is inclined. The acoustic center of a pressure transducer and the pressure gradient transducers are positioned within an imaginary sphere having a radius that corresponds to double the largest dimension of the diaphragm of one of the transducers.

Abstract: An audio compressor may regulate the level of an audio input signal depending on whether the level is above or below a threshold value. The audio compressor may control a pumping that is created when regulating a dynamic range of an audio signal with the threshold value. A feedback loop connecting the signal output from the audio compressor with a release filter may be used to modify an effective release time of the signal. A controller may be used that allows a filter coefficient of the release filter to be controlled to adjust the effective release time as a function of the signal output.

Abstract: A system for receiving digital audio data may include a diversity-receiving unit. The diversity-receiving unit may include at least two antennas and at least one receiving channel, which can be switched from one antenna to another antenna. To reduce audible disturbances in the receiving channel, a dropout concealment may be carried out when disturbances in the received audio signal occur. The dropout concealment may use intact audio signal parts before the disturbance and/or after the disturbance to synthesize the concealment signal. The receiving channel may be switched to another antenna as a function of whether the dropout concealment is activated.

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.

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: A transducer assembly includes a first electroacoustic transducer and a second electroacoustic transducer. The first and the second electrostatic transducers include an electrode and a counter electrode. An inner circumference of an outer diaphragm section lying within an outer circumference forms the counter electrode of the first electroacoustic transducer. An inner diaphragm section that lies within the inner circumference of the outer diaphragm section forms the counter electrode of the second electroacoustic transducer.

Abstract: An earphone device converts electric signals to audible sound. The device includes an outer area configured to receive a power source. A plug area adjacent to the outer area may be configured to fit within a user's auditory canal. A dynamic transducer reproduces a predetermined frequency spectrum for the user. A sound channel terminating at an output of the dynamic transducer encloses the second transducer.

Abstract: A system that models a microphone may include capsules that receive individual signals. The signals may be combined and modified based on a weighting factor. Directivity patterns of a converted signal may be modified or controlled based on the weighting of the signals.

Abstract: An earphone device converts electric signals to audible sound. The earphone includes a first electroacoustic transducer and a second electroacoustic transducer. A separating part of the earphone is positioned between the second transducer and a sound opening of a plug area of the earphone. The separating part forms a barrier between a first sound path for the first transducer and a second sound path for the second transducer. The first sound path comprises a substantially annular cross-section disposed around the second sound path. The earphone includes a filter disk arranged in the sound opening, in which an acoustic friction is provided for each of the first and second sound paths.

Abstract: A method conceals dropouts in one or more audio channels of a multi-channel arrangement. The method maps transmitted signals into a frequency domain during an error-free signal transmission of two or more channels. A magnitude spectra and spectral filter coefficients are derived. The spectral filter coefficients relate the magnitude spectrum of the audio channel to the magnitude spectrum of at least one other channel. When a dropout occurs, a replacement signal is generated through the filter coefficients and a substitution signal. The filter coefficients may be generated prior to the detection of the dropout.

Abstract: A transducer membrane enhances sound reproduction. Curved portions of the membrane periphery contribute to the enhanced sound reproduction. The transducer membrane may add or improve sound reproduction capability in cell phones, gaming systems, personal data assistants, or other devices.

Abstract: A system determines the position of a sound source with a microphone in a fixed coordinate system. The microphone measures audio signals that are analyzed and processed to determine the position of the sound source in the fixed coordinate system. The system may adjust the direction of the microphone in the fixed coordinate system based on the processed audio signals and the position of the sound source. The microphone direction may be identified through an optical source that may be adjusted based on the processed audio signals and the position of the sound source.

Abstract: The system converts an analog input signal into a digital output signal while avoiding interference, such as clipping. The system derives two signal components having differing signal magnitude levels from the analog input signal. The signal components are subjected to independent analog to digital conversion, such as through low resolution analog to digital converters. The system determines weighting factors for the two signal components based on at least one property of at least one of the signal components, such as the level of at least one of the signal components. The signal components are weighted. The weighted signal components are merged.

Abstract: A diversity receiving device includes two signal paths. Each path interfaces an antenna that receives a radio frequency signal and an amplifier that amplifies the received radio frequency signal. A variable signal level attenuator in each path attenuates the amplified signal and receives current from current sources. The current sources are coupled to the amplifiers through variable signal level attenuators. The variable signal level attenuators are in parallel with controllable bypass lines which comprise variable resistance elements. The two signal paths are combined into a common path.

Abstract: A system for receiving digital audio data may include a diversity-receiving unit. The diversity-receiving unit may include at least two antennas and at least one receiving channel, which can be switched from one antenna to another antenna. To reduce audible disturbances in the receiving channel, a dropout concealment may be carried out when disturbances in the received audio signal occur. The dropout concealment may use intact audio signal parts before the disturbance and/or after the disturbance to synthesize the concealment signal. The receiving channel may be switched to another antenna as a function of whether the dropout concealment is activated.