Abstract:
Die vorliegende Erfindung betrifft ein Verfahren für eine Audiosignalverarbeitung in einem Fahrzeug (10). Um eine einfache und zuverlässige Echokompensation für eine Spracherkennung bei gleichzeitiger Wiedergabe eines mehrkanaligen Audioquellsignals in einem Fahrzeug (10) zu ermöglichen, wird ein Monoaudiosignal auf der Grundlage eines mehrkanaligen Audioquellsignals erzeugt. Das Monoaudiosignal wird auf einen Frequenzbereich zwischen einer vorgegebenen unteren Frequenz und einer vorgegebenen oberen Frequenz begrenzt, beispielsweise auf einen Bereich von 100Hz bis 8kHz. Das begrenzte Monoaudiosignal wird über mehrere Lautsprecher (17-20) in dem Fahrzeug (10) ausgegeben. Ein Einfluss des über die mehreren Lautsprecher (17-20) ausgegebenen begrenzten Monoaudiosignals auf ein in dem Fahrzeug (10) über ein Mikrofon (13) empfangenes Sprachaudiosignal wird mittels des begrenzten Monoaudiosignals in einem Echokompensator (25) kompensiert.
Abstract:
For generating 3D audio content from a two-channel stereo signal, the stereo signal ( x ( t )) is partitioned into overlapping sample blocks and is transformed into time-frequency domain. From the stereo signal directional and ambient signal components are separated, wherein the estimated directions of the directional components are changed by a predetermined factor, wherein, if changes are within a predetermined interval, they are combined in order to form a directional centre channel object signal. For the other directions an encoding to Higher Order Ambisonics (HOA) is performed. Additional ambient signal channels are generated by de-correlation and rating by gain factors, followed by encoding to HOA. The directional HOA signals and the ambient HOA signals are combined, and the combined HOA signal and the centre channel object signals are transformed to time domain.
Abstract:
The present document relates to the design of anti-aliasing and/or anti-imaging filters for resamplers using rational resampling factors. In particular, the present document relates to a method for implementing such anti-aliasing and/or anti-imaging filters with reduced computational complexity. In addition, the present document relates to further aspects of an audio encoding and decoding system, such as the phase relation between the channels of a multi-channel audio signal and/or the structure of the bitstream of an encoded audio signal.
Abstract:
An audio decoder device for decoding a compressed input audio signal comprising at least one core decoder (6, 24) having one or more processors (36, 36') for generating a processor output signal (37) based on a processor input signal (38, 38'), wherein a number of output channels (37.1, 37.2, 37.1', 37.2') of the processor output signal (37, 37') is higher than a number of input channels (38.1, 38.1') of the processor input signal (38, 38'), wherein each of the one or more processors (36, 36') comprises a decorrelator (39, 39') and a mixer (40, 40'), wherein a core decoder output signal (13) having a plurality of channels (13.1, 13.2, 13.3, 13,4) comprises the processor output signal (37, 37'), and wherein the core decoder output signal (13) is suitable for a reference loudspeaker setup (42); at least one format converter device (9, 10) configured to convert the core decoder output signal (13) into an output audio signal (31), which is suitable for a target loudspeaker setup (45); and a control device (46) configured to control at least one or more processors (36, 36') in such way that the decorrelator (39, 39') of the processor (36, 36') may be controlled independently from the mixer (40, 40') of the processor (36, 36'), wherein the control device (46) is configured to control at least one of the decorrelators (39, 39') of the one or more processors (36, 36') depending on the target loudspeaker setup (45).
Abstract:
An apparatus for generating a modified audio signal comprising two or more modified audio channels from an audio input signal comprising two or more audio input channels is provided. The apparatus comprises an information generator (110) for generating signal- to-downmix information. The information generator (110) is adapted to generate signal information by combining a spectral value of each of the two or more audio input channels in a first way. Moreover, the information generator (110) is adapted to generate down mix information by combining the spectral value of each of the two or more audio input channels in a second way being different from the first way. Furthermore, the information generator (110) is adapted to combine the signal information and the downmix information to obtain signal-to-downmix information. Moreover, the apparatus comprises a signal attenuator (120) for attenuating the two or more audio input channels depending on the signal-to-downmix information to obtain the two or more modified audio channels.
Abstract:
The present invention discloses a system for producing at least three dimensional digital stereo surround sound output with an angle coverage of 360 degrees without using powered amplifiers at output stage while covering both horizontal and vertical listening layout areas whereby facilitating evenly distributed three dimensional surround effects irrespective of the position of the listener for 360 degree listening experience with immersive surround sound effects. The output audio signal is synchronizes with the actual source in three dimensional space. The present invention is also used with the headphone device to produce three dimensional stereo surround sound effect and provides a soothening effect so that the user hears the so produced surround sound for a very long time. Upon re-recording with a camcorder, the media content having 3 dimensional digital stereo surround sound output, the output video has unrecognisable audio whereby providing an antipiracy mechanism.
Abstract:
The present invention relates to a method for selecting auditory signal components for reproduction by means of one or more supplementary sound reproducing transducers, such as loudspeakers, placed between a pair of primary sound reproducing transducers, such as left and right loudspeakers in a stereophonic loudspeaker setup or adjacent loudspeakers in a surround sound loudspeaker setup, the method comprising the steps of (i) specifying an azimuth angle range within which one of said supplementary sound reproducing transducers is located or is to be located and a listening direction; (Ii) based on said azimuth angle range and said listening direction, determining left and right interaural level difference limits and left and right interaural time difference limits, respectively; (iii) providing a pair of input signals for said pair of primary sound reproducing transducers; (iv) pre-processing each of said input signals, thereby providing a pair of pre-processed input signals; (v) determining interaural level difference and interaural time difference as a function of frequency between said pre-processed signals; and (vi) providing those signal components of said input signals that have interauial level differences and interaural time differences in the interval between said left and right interaural level difference limits, and left and right interaural time difference limits, respectively, to the corresponding supplementary sound reproducing transducer. The invention also relates to a device for carrying out the above method and systems of such devices.
Abstract:
A method, manner, process, system and product to transparently deliver audio through fusion of fixed loudspeakers and headphones without disconnecting the user from external sonic atmosphere to simultaneously create a sonic space around and inside the spectators head to deliver the sweet spot experience intended by the composer/director/artist to every spectator irrespective of their location within the arena/cinema/hall while giving the audio content more dimensional perspectives otherwise impossible.