Abstract: In a speech device for a hands-free system in a vehicle, at least one microphone is arranged on a guide element encompassing a safety belt. The guide element is fixed to a free end of a holding element, along which there is arranged a first line section of a signal line and/or a supply line of the microphone. One attachable end of the holding element that is opposite the free end, can be fixed in particular to a vehicle seat associated with the safety belt by means of a detachable mechanical connection that comprises at least one electric contact for the microphone.

Abstract: A sound system which has, for example, a radio, a cassette and a CD player is usually already installed in cars as standard or as an option. In addition, a better sound system includes a box system which has a tweeter and a woofer. In order to provide a speaker box which is suitable particularly for dispensing frequencies below 150 Hz and at the same time has neat pulses accompanied at the same time by little distortion, pulse dynamics and is highly effective, a sound transducer (10) is introduced into the supporting structure of the vehicle. This takes place in such a manner that subcompartments which are separated from each other adjoin each of its two membrane sides. In this case, the two subcompartments of the speaker box are formed by at least two elements (2, 3, 4) of the supporting structure of the vehicle (1).

Abstract: The invention relates to a speaker device for a hands-free device in a vehicle, comprising at least one microphone (5) that is arranged on a guide element (6) encompassing a safety belt (4), wherein the guide element (6) is fixed to a free end (7.1) of a holding element (7), wherein a first line section (8.1) of a signal line and/or a supply line (8) of the microphone (5) is arranged along the holding element (7). According to the invention, one attachable end (7.2) of the holding element (7) that is opposite the free end (7.1) of the holding element (7), can be fixed in particular to a vehicle seat associated with the safety belt (4) by means of a detachable mechanical connection (9), wherein the connection (9) comprises at least one electric contact for the microphone (5).

Abstract: A sound system which has, for example, a radio, a cassette and a CD player is usually already installed in cars as standard or as an option. In addition, a better sound system comprises a box system which has a tweeter and a woofer. In order to provide a speaker box which is suitable particularly for dispensing frequencies below 150 Hz and at the same time has neat pulses accompanied at the same time by little distortion, pulse dynamics and is highly effective, a sound transducer (10) is introduced into the supporting structure of the vehicle. This takes place in such a manner that subcompartments which are separated from each other adjoin each of its two membrane sides. In this case, the two subcompartments of the speaker box are formed by at least two elements (2, 3, 4) of the supporting structure of the vehicle (1).

Abstract: To ensure the same high quality of acoustic radiation from audio systems on each seat of current vehicles, an acoustic device is provided for generating audio signals, which allows sound sources to be integrated into the area located near the headrest of a vehicle seat such that the volume can be regulated in an individual manner without unduly disturbing the other passengers in a vehicle. The headrest does not comprise any loudspeakers, thus is safe regarding accident protection. The acoustic near field at the headrest is generated by means of a sound channel. The loudspeaker is disposed inside the backrest or under the seat, for example, while the sound channel terminates in the headrest. Tuned pipes, the end of which is adjusted to the acoustic impedance of the clearance zone, are used as a sound channel.

Abstract: Voice command operated systems are being installed in modern motor vehicles with increasing frequency. Such systems should be operable by various vehicle occupants and from various seating positions. A new type of speech recognition system is described, which is good at accomplishing these tasks. Therein, for regulating the speech recognition system, the reception characteristic of a a directionally selective microphone array (12) is controlled by an optimization unit (10). These speech signals are then processed in a speech recognizer (11) at least parallel in time. Then, on the basis of the results provided by the speech recognizer (11), the reception characteristic of the microphone array (12) is so controlled by an optimization unit (10), that the recognition performance of the speech recognizer (11) downstream of the optimization unit (10) is optimized.

Abstract: The invention relates to a motor vehicle, in which at least one microphone (8) is mounted in the headlining 94) of a passenger cell of the vehicle. The microphone is mounted in a location, which is concealed by a sun visor (6) that is pivotally mounted on the headlining (4) when said visor has been pivoted to lie against the headlining (4). At least the area (7) of the sun visor (6) that conceals the microphone is configured to conduct sound.

Abstract: The invention relates to a motor vehicle, in which at least one microphone (8) is mounted in the headlining 94) of a passenger cell of the vehicle. The microphone is mounted in a location, which is concealed by a sun visor (6) that is pivotally mounted on the headlining (4) when said visor has been pivoted to lie against the headlining (4). At least the area (7) of the sun visor (6) that conceals the microphone is configured to conduct sound.

Abstract: A parametric loudspeaker system is described which is based upon the FM-modulation of an ultrasound carrier. Known systems work with AM-modulation. The FM-modulation produces a good matching to the resonant transducer such as the conventionally employed piezo-ceramic transducers. The resonance slope of the transducers is used for FM/AM-conversion. This FM-resonance principle can advantageously be employed in a multi-path loudspeaker system, in which the transducer works in the optimal resonance range in each of the paths. With the conventional AM-modulation this is not possible. The FM-resonance principle can also be used in resonance-free or resonance-poor transducers, such as for example electrostatic transducers.

Abstract: A voice input system comprising a stationary central unit (1) and a mobile voice interface (2) which is carried around by the user, e.g. in his clothing, is described. The voice interface (2) is used to acoustically record spoken commands which are transmitted to the central unit (1) over a wireless link after being electronically processed. The voice interface contains two or more microphones (3a, 3b, 3c), which cooperate as a microphone array, thereby making possible a directional characteristic during sound recording and also substantial noise suppression. The central unit (1) contains the components for speech recognition, e.g. a processor system, and interfaces (4a. 4b, 4c) via which external appliances are controlled over a wireless link or by cable.

Abstract: Parametric loudspeakers that are based on a modulated ultrasound carrier signal produce strong directional patterns. This strong directional patterns require a direct transmission path from the loudspeaker to the audience. Obstacles in this path have a reflecting or absorbing effect. The invention describes a mechanical arrangement of a parametric loudspeaker with a mobile reflector. The arrangement allows tracking of the emitted sound in the direction of a moving audience. The invention provides for advantageous installation possibilities, for example in the rooflining of vehicles or as a mobile system.

Abstract: An arrangement of parametric loudspeakers is described, in which the totality of the transducers is subdivided into groups, wherein each group is controlled by at least one modulator associated therewith, so that a parametric multi-path loudspeaker system results. Thereby it is made possible, that for each of the paths the transducer operates in the optimal resonance range.

Abstract: The present invention relates to a method with which speech is captured in a noisy environment with as high a speech quality as possible. To this end, a compact array of, for example, two single microphones is combined to form one system through signal processing methods consisting of adaptive beam formation and spectral subtraction. Through the combination with a spectral subtraction, the reference signal of the beam former is freed from speech signal components to the extent that a reference signal of the interference is formed and the beam former produces high gains.

Abstract: The aim of the invention is to ensure the same high quality of acoustic radiation from audio systems on each seat of current vehicles. Said aim is achieved by a novel acoustic device for generating audio signals, which allows sound sources to be integrated into the area located near the headrest of a vehicle seat such that the volume can be regulated in an individual manner without unduly disturbing the other passengers in a vehicle, who hear the audio signals to a significantly reduced extent. The headrest does not comprise any loudspeakers, thus offering good creative possibilities regarding accident protection and design. The acoustic near field at the headrest is generated by means of a sound line. The loudspeaker is disposed inside the backrest or under the seat, for example, while the sound line terminates in the headrest. Tuned pipes, the end of which is adjusted to the acoustic impedance of the clearance zone, are used as a sound line.

Abstract: For an especially low loss and echo free communication between several participants in a room (1) an inventive process for the compensation of losses of a signal(S) along a transmission path between at least one transmission point (6) and one receiving point (4) in a room (1) determining the transmission path of signal (S) and via the transmission paths at least one parameter of an associated transmission function will be determined, whereby via the determined parameters the signal level for a given position (P1 through P4) on the transmission path is controlled. Additionally an especially suitable device is provided for the implementation of the process.

Abstract: A plug-in compartment (16) into which a microphone (18) can be plugged in a functionally capable fashion is installed in the passenger cell of a motor vehicle.

Abstract: Voice command operated systems are being installed in modern motor vehicles with increasing frequency. Such systems should be operable by various vehicle occupants and from various seating positions. A new type of speech recognition system is described, which is good at accomplishing these tasks. Therein, for regulating the speech recognition system, the reception characteristic of a a directionally selective microphone array (12) is controlled by an optimization unit (10). These speech signals are then processed in a speech recognizer (11) at least parallel in time. Then, on the basis of the results provided by the speech recognizer (11), the reception characteristic of the microphone array (12) is so controlled by an optimization unit (10), that the recognition performance of the speech recognizer (11) downstream of the optimization unit (10) is optimized.

Abstract: In a method for reducing interferences in a voice signal, a noise reduction method is applied to the voice signal, and spectral psychoacoustic masking is taken into account. A spectral masking curve is determined both for the input signal and the output signal of the noise reduction method. By comparing the signal portions exceeding the respective masking curve, newly-audible portions are detected in the form of interference in the output signal and subsequently damped selectively.

Abstract: A method for reducing interference in acoustic signals by using of an adaptive filter method involving spectral subtraction. The inventive method enables a significant reduction of interference in acoustic signals, especially voice signals, without causing any substantial falsification of said signals such as echo or musical tones, and significantly reduces computational requirements in comparison with other methods known per se that are similarly designed to improve signal quality.

Abstract: A process and a device for producing a directed audio sound (3) on the basis of an amplitude demodulated ultrasound carrier signal (2) of high intensity. Therein, in accordance with the invention, the sound emitted by the ultrasound emitter (1) is reflected by a reflector (5) to a new direction. By appropriate shaping of the reflector surface, the audio sound (3) can be focused. The level of the ultrasound carrier signal (2) can be dampened by coating of the reflector (5) with an appropriate absorptive material, so that in the ideal case only the acoustic audio signal (3) reaches of the listener (4).