Method for cancelling unwanted loudspeaker signals

In a method for canceling unwanted signals from at least one external sound source, such as a loudspeaker, by means of headphones provided with microphones, at least known sound signals from the at least one external sound source are compensated by anti-phase sound signals. These sound signals simulate the at least known sound signals from said at least one external sound source in anti-phase. Said anti-phase sound signals are generated in the headphones in response to signals derived from audio input signals of the at least one external sound source in a filter device which is controlled by the resulting microphone signals

A new blind signal separation algorithm based on second-order statistics

This paper addresses the problem of separating multiple speakers from mixtures of these that are obtained using multiple microphones in a room. A new adaptive blind signal separation algorithm is derived which is entirely based on Second Order Statistics which is entitled CoBliSS. The CoBliSS algorithm can run in offline or online (adaptive) mode. One of the advantages of the CoBliSS algorithm is that no assumptions are made about the probability density functions or other properties of the signals. Experiments with real recordings were carried out in a normal living room which show that the algorithm has good performance. As opposed to most other algorithms no parameters need to be tuned

Audio frequency range adaption

To improve the reproduction of audio signals, the signal components of a selected audio frequency range (1) of an audio signal are concentrated in a narrower audio frequency range (II). This is achieved by detecting first signal components in the first audio frequency range (I), generating second signal components in the second audio frequency range (II), and controlling the amplitude of the second signal components in response to the amplitude of the first signal components. As a result, dedicated transducers may be used which are particularly efficient in the narrower frequency range. The original frequency range (I) may contain the lower frequency signal components (bass components) of the audio signal

Generation of a sound signal

In a method and a media system of/for generation of at least one output signal (HPL,HPR) from at least one input signal belonging to a second set of sound signals (M) having a related second set of Head Related Transfer Functions, in which the media system can be a TV, a CD player, a DVD player, a Radio, a display, an amplifier, a headphone or a VCR, the method includes the steps of determining, for each signal in the second set of sound signals, a weighted relation (14) including at least one signal belonging to a third set of intermediate sound signals (CHI1, CHI2) and at least one weight value (Weights); determining a first set of Head Related Transfer Functions (HRTFs) based on the second set of sound signals, the second set of Head Related Transfer Functions and the weighted relation; and transferring at least one signal belonging to the third set of intermediate sound signals by means of at least one HRTF belonging to said first set of Head Related Transfer Functions in order to generate at least one output signal belonging to said first set of sound signals. Hereby, in the end, fewer HRTFs are determined for a subsequent transfer of input signal(s) to output signal(s). Accordingly, few convolutions are required

Generation of a sound signal

In a method and a media system of/for generation of at least one output signal (HPL,HPR) from at least one input signal belonging to a second set of sound signals (M) having a related second set of Head Related Transfer Functions, in which the media system can be a TV, a CD player, a DVD player, a Radio, a display, an amplifier, a headphone or a VCR, the method includes the steps of determining, for each signal in the second set of sound signals, a weighted relation (14) including at least one signal belonging to a third set of intermediate sound signals (CHI1, CHI2) and at least one weight value (Weights); determining a first set of Head Related Transfer Functions (HRTFs) based on the second set of sound signals, the second set of Head Related Transfer Functions and the weighted relation; and transferring at least one signal belonging to the third set of intermediate sound signals by means of at least one HRTF belonging to said first set of Head Related Transfer Functions in order to generate at least one output signal belonging to said first set of sound signals. Hereby, in the end, fewer HRTFs are determined for a subsequent transfer of input signal(s) to output signal(s). Accordingly, few convolutions are require

Improving percieved bass and reconstruction of high frequencies for band limited signals

Bandwidth extenstion methods are required in systems that playback bandlimited signals (e.g. telephone, MP3) or that are not capable of reproducing signals with a large bandwidth (small or inexpensive loudspeakers). The first part of this paper deals with reproducing low pitched signals through small loudspeakers. This work is based on psychoacoustic phenomena to invoke a deep bass impression using only higher frequency components. The second part of this paper deals with high-frequency bandwidth extension of music and speech. In this method, no additional information on the original wide band content is required. It aims at providing a more pleasant and brighter sound impression

Efficient realization of the block frequency domain adaptive filter

In many frequency domain adaptive lters Fast Fourier Fourier Transforms FFTs are used to transform signals which are augmented with zeros The overall computational complexity of these adaptive lters is mainly determined by these windowed FFTs rather than by the ltering operation itself This contribution presents a new way of calculating these windowed FFTs efficiently In addition a method is deduced for implementing nonwindowed FFTs of overlapping input data using the previously mentioned ecient windowed FFTs Also a method is presented for implementing the windowed FFTs in the update part even more efficient

Device for and a method of processing data

A device (100) for processing data, the device (100) comprising a detection unit (110) adapted for detecting individual reproduction modes indicative of a manner of reproducing the data separately for each of a plurality of human users, and a processing unit (120) adapted for processing the data to thereby generate reproducible data separately for each of the plurality of human users in accordance with the detected individual reproduction modes

Autonomous wireless die

A wireless die (2) comprises an orientation detector (4) for determining an orientation of the die (2) and a transmitter (5) connected to the orientation detector (4) for transmitting die (2) orientation data to the receiver (3). The orientation detector (4) comprises at least two electromechanical detectors (6), the electromechanical detectors (6) being arranged for generating electrical power for the orientation detector (4) and transmitter (5), and for supplying gravity based orientation data