Institut Fur Rundfunktechnik Gmbh

Ntt Docomo, Inc.

Christian Hartmann

Jens Groh

Sebastian Goossens

Katsutoshi Kusume

Gerhard Bauch

Michael Meier

Christian Bettstetter

Jonas Knappe

Iris Gerstlberger

Robert Vilzmann

In order to realize a correction for changes in the reproduction loudness at low frequencies in a downmix-arrangement, a mixing arrangement is proposed for mixing at least two audio signals, which mixing arrangement is provided with a first unit () for deriving a first power signal, which is a measure for the power of the first audio signal, a second unit () for deriving a second power signal, which is a measure for the power of the second audio signal, a cross-correlation unit () for deriving a cross-correlation signal, which is a measure for a cross-correlation between the first and the second audio signal, a unit () for deriving multiplication parameters from the first and second power signals and the cross-correlation signal, and a multiplication and combination unit () for carrying out a signal processing on the first and second audio signals and combining them. The unit () for deriving the multiplication parameters is provided with a combination unit () for deriving a combination signal which is a measure for a combination of the first and second power signals and the cross-correlation signal, and is provided with a scaling unit () for scaling one of the signals in the unit for deriving the multiplication parameters with a scaling signal. The scaling signal (D[k]) has a frequency characteristic which is a substantially constant below a first frequency value (kL), is increasing between the first frequency value (kL) and a second higher frequency value (kU) and is again substantially constant above the second frequency value. The unit () for deriving the multiplication parameters is further adapted to derive a single multiplication parameter m[k]) from the combination signal, and the multiplications and combination unit () is adapted to carry out a signal processing on the first and second audio signals which is equivalent to multiplying the first and second audio signals with this single multiplication parameter, and combining the so multiplied first and second audio signals.

Arrangement for mixing at least two audio signals

A method for down-mixing of a m-channel audio signal (L, R, C, Ls, Rs, Rss, Lss) into a n-channel audio signal (Ro, Lo, Rso, Lso), where m is an integer for which holds m&#x3e;n and n is an integer for which holds n&#x2267;2, including the step of generating one of the n-channel audio signals of one side (right or left) of a listener (Ro, Lo, Rso, Lso), by a combination of: a first term including a signal component (R, L, Rs, Ls) of the m-channel audio signal of the same side only, and a second term dependent of m, including one or more of further signal components of the m-channel audio signal (C, Ls, Rs, Rss, Lss) of the same side only, multiplied by at least one respective filtering function (H1, H2, H3, H4, H5, H6, H7, H8), said filtering function being dependent on: a frequency characteristic of the transmission path between the position of the loudspeaker of the respective signal component of the further m-channel audio signal, and a position of the right ear or left ear, respectively, of a listener in an m-channel reproduction situation, and a frequency characteristic of the transmission path between the position of a loudspeaker of the said one of the n-channel audio down-mixed signals, (Ro, Lo, Rso, Lso), and a position of the right ear or left ear, respectively, of a listener in an n-channel reproduction situation.

Method and apparatus for down-mixing of a multi-channel audio signal

In order to achieve an improved audio presentation of sounds, in particular sports specific sounds, at reduced technical effort during any video recording, it is suggested to capture sensor-based and analyze image contents of video images. From the information obtained hereby, fitting sound events (audio samples) are selected according to predefined criteria from an audio database. The selected sound events are automatically added to the components of a video accompanying sound.

Method and assembly for improved audio signal presentation of sounds during a video recording

A receiver includes a receiving unit for scanning a dedicated signaling channel for the presence of an announcement signal. The announcement signal indicates a transmitter willing to access a transmission medium. The receiving unit is further operative to receive a data signal from a further transmitter on a dedicated traffic channel. Furthermore, the receiver includes an interference estimator for estimating, whether an interference caused by a new transmitter is allowable or not. A processor is provided for applying an interference counter-measure, when the interference is not allowable. A transmitter can, without any limitation, transmit the announcement signal. The transmitter will start transmitting, when it receives a ready-to-receive signal from the addressed receiver and when it does not receive an objection tone from another receiver in the network.

Receiver and transmitter for a network having a non-centralized medium access control

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Munich, Germany

Christian Hartmann