Abstract:
A sound system (8) comprises a transducer unit (1) and a frequency mapping device (2). The transducer unit comprises an array of transducers (14). The frequency mapping device is arranged for mapping a frequency range of an audio input signal (V in ) onto a frequency at which the transducer unit has a maximum efficiency, such as a resonance frequency or the Helmholtz frequency of the transducer unit. The transducer unit (1) may comprise a dedicated transducer (13) is coupled to the frequency mapping device (2) for producing the Helmholtz frequency of the transducer unit (1). The sound system may additionally comprise a sound processing device (3) arranged for steering sound produced by the array of transducers (14).
Abstract:
An audio signal processing device comprises signal supply means to supply over more than one input channel and per input channel over separate frequency subbands domain subchannels coded audio signals. Further filters are used to decode and synthesize the audio signals over the total frequency domain. Subband combination circuits are used for supplying respective input channels to the same subband combination circuit the signals from the same subband frequency domain audio signals.
Abstract:
A loudspeaker protection system comprises filter means for defining one or more frequency bands of an audio signal, controllable amplifier/attenuator means coupled to the filter means, and processing means coupled to control the amplifier/attenuator means, such as to determine audio power in at least one of said frequency bands representing relevant loudspeaker protection information used for selective audio power control in said at least one frequency band. This system has the features for a fast and/or slow thermal protection, as well as for a cone excursion protection all for a loudspeaker in such a system.
Abstract:
The present invention refers to an active sound reduction system and method for attenuation of sound emitted by a primary sound source, especially for attenuation of snoring sounds emitted by a human being. This system comprises a primary sound source, at least one speaker as a secondary sound source for producing an attenuating sound to be superposed with the sound emitted by said primary sound source, a reference microphone for receiving sound from said primary sound source, and at least one error microphone being allocated to each speaker to form a speaker/microphone pair. The at least one error microphone is provided as a directional microphone pointing at its allocated speaker to receive residual sound resulting from the superposition of the sounds from the primary sound source and the corresponding speaker. The error microphone and speaker of at least one speaker/microphone pair and the primary sound source are arranged substantially collinear. A control unit is provided to receive an output reference signal of the reference microphone representing the sound received by the reference microphone and an output error signal of the at least one error microphone representing the sound received by the at least one error microphone and to calculate a control signal for the speaker from the output reference signal and the output error signal.
Abstract:
The audio reproduction apparatus comprises a cost input for inputting a mathematical cost derived from a measurement, which measurement is user-influenceable and a conditioning unit, capable of delivering an output audio signal in dependence of the mathematical cost, characterized in that the conditioning unit comprises an audio processing means arranged to process an input audio signal to derive the output audio signal with a reproduction quality in dependence of the mathematical cost. As a reproduction quality the position of a virtual sound source and the quality of a stereo signal are also possible. A system comprising the audio reproduction apparatus, a measurement device and a sound production device and a method of to deriving the output audio signal with a reproduction quality in dependence of the mathematical cost are also presented.
Abstract:
The present invention relates to a method and a media system of/for generation of at least one output signal (HPL, HPR) from at least one input signal from a second set of sound signals (M) having a related second set of Head Related Transfer Functions. The media system can be a TV, a CD player, a DVD player, a Radio, a display, an amplifier, a headphone or a VCR. Said method includes the steps of determining, for each signal in the second set of sound signals, a weighted relation (14) comprising at least one signal from 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 from the third set of intermediate sound signals by means of at least one HRTF from 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.
Abstract:
Multi channel audio reproduction has already been used for some time. For example the so-called surround sound signals can improve the appearance of reproduced sound to a great extent. To improve the reproduction of sound signals even further it is in this invention proposed to use enhancing means to process at least some signal parts even further using a monotone transfer function.
Abstract:
A method and audio converter for generating further audio signals ( u , ul, ur, uc, us) from initial audio signal ( x , xl, xr), wherein optionally an information signal (in means 23) is derived from said initial audio signals ( x ). On basis of the initial audio signal ( x , xr, xl), a dominant signal y(k) and a residue signal (or signals) q(k), substantially transverse to each other, are determined (means 21 and 22). In at least two frequency ranges frequency components of the dominant signal are analysed (means 24), and a difference signal yr ((y(k)-yb(k)) corresponding to the dominant signal minus a frequency range component of the dominant signal in one or more frequency ranges (yb(k)) is formed. The difference audio signal yr and the residue signal q(k) are transformed into said further audio signal u (means 25), i.e. formula (I). Preferably in said means (25) the frequency range component is also transformed differently from the difference signal, i.e. formula (II) with T gamma M.
Abstract:
A multi-channel stereo converter is described comprising stereo magnitude determining means for generating a stereo information signal (a/b; ( rho ), which represents a degree of stereo between audio input signals (L, R), and transforming means for transforming said audio signals (L, R) based on said stereo information signal (a/b; ( rho ) into at least a surround signal (S). A space mapping interpretation is presented and an audio centre signal may be derived from the stereo input signals as well. The result is more flexibility in application and design, without substantial cross talk in the audio signals.
Abstract:
The present invention relates to a method and a device for reducing snore annoyances, wherein a snore sound pattern of a snoring person is determined to predict an upcoming snore sound level and wherein a faked snore sound is played to flatten the resulting snore sound level.