Bang and Olufsen A/s

Jakob Dyreby

Martin Olsen

Martin Bo Møller

Jonas Martin Helm

Gert Kudahl Munch

Pablo Martínez-nuevo

Lasse Zinck Thomasberg

Jens Rahbek

Niels De Koeijer

Alix Jeannerot

The present disclosure relates to a method and system for calibrating a loudspeaker system in an environment (). The loudspeaker system comprises an audio device () with a first and second loudspeaker arranged with a predetermined horizontal separation. The method comprises the steps of emitting (S, S) a first and second calibration audio signal from the first and second loudspeaker () of the audio device (), wherein the second calibration audio signal is distinguishable from the first calibration audio signal. The method further comprises receiving (S, S), with a first external microphone () the first and second calibration audio signal, determining (S) the position of the first external microphone () relative to the audio device () and calibrating (S) the loudspeaker system based on the determined position of the first external microphone ().

Method and system for surround sound setup using microphone and speaker localization

The invention relates to a method for improving the sound quality of a sound reproduction or recording in a room, the method comprising the steps of measuring an impulse response that comprises the linear response of the room; performing a time domain analysis to determine the resonances of the room and for a chosen group of room resonances determining a corresponding group of filters that, when inserted in a sound reproduction or recording chain in said room will counteract the unwanted effect of said chosen group of room resonances on the sound quality of sound reproduction or recording made in the room. The invention further relates to a device designed to implement the method according to the invention and to the use of a measure of amplitude decay as a function of frequency of a measured impulse response of a sound reproduction or recording system in a room to determine one or more resonance frequencies, the total or partial compensation of which will improve the sound quality of sound reproductions or recordings made in the room.

Method for improving sound quality of sound reproductions or sound recordings in a room

Disclosed is a method for increasing a perceived loudness of an audio data signal comprising the steps of obtaining a first digital audio data signal; determining at least one temporal amplitude peak in the first digital audio data signal; generating a second digital audio data signal by reducing the at least one temporal amplitude peak in the first digital audio data signal based on a predicted perceptual difference model representing a predicted perceptual difference between the first digital audio data signal and a peak reduced version of the first digital audio data signal; and generating a third digital audio data signal by amplifying the second digital audio data signal so that a peak of the second digital audio data signal has a predetermined signal value, wherein a perceived loudness of the third digital audio data signal is larger than a perceived loudness of the first digital audio data signal.

Method for increasing perceived loudness of an audio data signal

A loudspeaker device comprising a loudspeaker unit comprising a diaphragm with a first and second surface (such as the front and rear surface of the diaphragm, respectively) and an enclosure in which the loudspeaker unit is mounted such that the first surface of the diaphragm is in acoustic communication with the surroundings of the loudspeaker device. The device further comprises an internal cavity formed in the enclosure and being in acoustic communication with the surroundings of the loudspeaker device via an acoustic element. In the device, the second surface of the diaphragm is in acoustic communication with the internal cavity. The acoustic element can be varied between a state in which sound energy generated by the loudspeaker unit in the internal cavity can be emitted to the surroundings via the acoustic element and a state in which sound energy is substantially prevented from entering the surroundings via the acoustic element.

Loudspeaker enclosure with closeable port

The present invention describes a loudspeaker comprising a housing and a plurality of sound transducers arranged inside said housing, where the housing has two sides arranged on either side of a x-y plane with a mutual distance between said sides measured along a z-axis orthogonal to the x-y plane, and a front facing side and a rear facing side, and a top and a bottom, wherein a. A first sound transducer is arranged inside a first cavity inside said loudspeaker housing, where said first cavity has a narrow first slit in the y-direction provided in the rear facing side, where said first slit has a width zin the z-direction, and a length yin the y-direction where the length yin the y-direction is larger than the width zin the z-direction; b. A second sound transducer is arranged inside a second cavity inside said loudspeaker housing, separate from said first cavity, and where said second cavity is provided with a narrow second slit in the y-direction provided in the front facing side, where said second slit has a width zin the z-direction, and a length yin the y-direction, where the length yin the y-direction is larger than the width zin the z-direction.

Loudspeaker

A method for compensating for acoustic influence of a listening room on an acoustic output from an audio system including at least a left and a right loudspeaker, the method comprising determining a left frequency response and a right frequency response, designing a left compensation filter F, and a right compensation filter F, and during playback applying the left and right filters to left and right channel inputs. According to the invention, a target response in the listening position is simulated, and the left and right compensation filters are designed to filter transfer functions based on the simulated target function multiplied by an inverse of the left/right frequency responses. By relying on a simulated target instead of relying on an empirical approach, the general impact of a room can be more accurately captured by the target functions.

Active room compensation in loudspeaker system

A loudspeaker assembly enabled with means to control the directivity of sound emitted from the loudspeaker and the use of such an assembly in audio rendering equipment. The inventive assembly includes an acoustic lens having movable mechanical means enabling controlled directivity of the sound emitted from the loudspeaker by moving one or more of the movable mechanical means from a first position to a second position.

Adjustable acoustic lens and loudspeaker assembly

The invention relates to a sound wall comprising in total M elements comprising a front face (F), where the sound wall () has a lateral extension along an x-axis and a vertical extension along a y-axis, where the sound wall () comprises N elements (), where N&#x2264;M, which N elements in the front face (F) of each respective of these N elements are provided with a sound radiating unit, such as one or more loudspeaker units, configured to radiate sound energy from the respective front face and into the surroundings, such that a sound field can be created in front of the sound wall; where the sound wall is provided with signal providing means configured to provide the sound radiating units with a signal that is a combination of input signals, such as the left and right channel signals S(t), S(t) of a stereophonic signal. In embodiments of the invention, the sound wall () further comprises A elements (), where A&#x2264;M&#x2212;N, which A elements () are provided with sound absorbing means associated with the front face (F), whereby the sound wall () can be used to reduce the reverberation time of a room or other enclosure, in which the sound wall () is provided and/or H elements (), where H&#x2264;M&#x2212;N&#x2212;A, which H elements () comprises hardware components configured to control and provide signals to the sound radiating units in said N elements (). The invention also relates to a method for controlling a sound field in front of the sound wall.

Sound radiating arrangement and method of providing the same

A method for compensating for acoustic influence of a listening room on an acoustic output from an audio system including at least a left and a right loudspeaker, the method comprising determining a left frequency response and a right frequency response, designing left and right compensation filters, and during playback applying the left and right filters to left and right input signals. The method further includes determining mono and side responses and designing mono and side compensation filters, and, during playback, applying the mono compensation filter to a mono signal based on the left and right input signals, and applying the side compensation filter to a side signal based on the left and right input signals. The filters are thus combined to provide left and right output signals which have been left/right filtered and mono/side filtered.

The invention relates to a loudspeaker system as well as a loudspeaker with controllable directivity as well as a method for controlling the individual sound transducer units in order to obtain a given target directivity. The loudspeaker comprises a plurality of sound transducer units distributed over two or more surfaces of a body. Each of the sound transducer units are utilized for frequency dependent a) level/gain adjustment and b) delay/phase adjustment of each individual sound transducer unit. The sound emitting transducer units are organized in two or more transducer arrays where the physical placement of transducer units included in the at least two or more transducer unit arrays are symmetrical organized and mirrored around a common axis.

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Struer, Denmark

Jakob Dyreby