Abstract: Determining Par-Hilbert invariants is a reliable auxiliary means in the field of real-time transmission of spatial audio signals. So-called CC-HRTFs make way for an inverse and stable model of spatial perception both on headphones and on loudspeakers, with precise localization in the three-dimensional space.

Abstract: Determining Par-Hilbert invariants is a reliable auxiliary means in the field of real-time transmission of spatial audio signals. So-called CC-HRTFs make way for an inverse and stable model of spatial perception both on headphones and on loudspeakers, with precise localization in the three-dimensional space.

Abstract: Direct extraction of multichannel signals using correlation comparison, which firstly provides its mathematically exact solution for time-invariant (steady-state) signals, and has a specific residual response in the case of time-variant (non-steady-state) signals, results in direct verification of a signal that forms the basis of all residuals and that is very simple to determine. This can be used in audio coding, for example, for efficiently reducing artifacts or colourations of the tone and other de-masking effects and results in efficient coding of signals of the highest order (such as NHK 22.2).

Abstract: Method for upmixing a downmix signal having a first channel and a second channel into an upmix signal, having the steps of: carrying out a correlation comparison in order to determine correlated signal components of the first and second channels of the downmix signal, wherein a first channel of the upmix signal is determined on the basis of the first channel of the downmix signal, a second channel of the upmix signal is determined on the basis of the second channel of the downmix signal and a third channel of the upmix signal is determined on the basis of the correlated signal components; determining at least one fourth channel of the upmix signal by inversely coding the first, second or third channel of the upmix signal.

Abstract: The invention permits optimum choice of those parameters which form the basis for the generation of stereophonic or pseudo-stereophonic signals. The user is provided with means for stipulating the degree of correlation, the definition range, the loudness and also further parameters of the resulting signals according to psychoacoustic aspects, and hence for preventing artifacts. The invention can be used to define highly efficient encoders or decoders which confine audio signals intended for reproduction by two or more than two loudspeakers as a mono signal plus a few parameters. Specific areas of application are telecommunications (hands-free devices), global networks, computer systems, broadcasting and transmission devices, particularly satellite transmission devices, professional audio technology, television, film and broadcasting and also electronic consumer goods.

Abstract: Upmix or coding apparatus for an audio signal, having: an inverse coding apparatus for determining a first channel and a second channel by means of linear inverse coding from an input signal; characterized by a first gain (50001) connected downstream of the inverse coding apparatus in the first channel; or a first gain (60001) connected downstream of the inverse coding apparatus in the first channel and a second gain (60002), which is different from the first gain (60001), connected downstream of the inverse coding apparatus in the second channel.

Abstract: The proposed apparatus or the proposed method permits the linear variation of the degree of correlation particularly of pseudo-stereophonic audio signals, and overall provides a comprehensive, albeit extremely simple, postprocessing option. This is desirable in telephony, for example, which, even today, is still almost fundamentally based on a mono signal, in the area of professional postprocessing of audio signals, particularly for narrowing or expanding the mapping width thereof, for obtaining stable FM stereo signals, or else in the area of high quality electronic consumer goods, the aim of which is extremely simple but efficient handling.

Abstract: An apparatus for stereophonizing a mono signal, comprising a convener for converting the mono signal into a principal signal and a side signal by delaying and amplifying the mono signal on the basis of an angle ? between sound source and microphone principal axis.

Abstract: An angle-dependent operating device and method for obtaining a pseudo-stereophonic audio signals, such as through the parameterization of a fictitious opening angle ?+?, where ? is the fictitious left-hand opening angle (situated to the left of the main axis of the monophonic audio signal to be stereophonized), and ? is the fictitious right-hand opening angle (situated to the right of the main axis of the monophonic audio signal to be stereophonized), where it may be that ???. This is provided for the situation of fictitious opening angles ?+? which are asymmetric with respect to the principal axis of the monophonic audio signal to be stereophonized.

Abstract: The invention permits optimum choice of those parameters which form the basis for the generation of stereophonic or pseudo-stereophonic signals. The user is provided with means for stipulating the degree of correlation, the definition range, the loudness and also further parameters of the resulting signals according to psychoacoustic aspects, and hence for preventing artifacts. The invention can be used to define highly efficient encoders or decoders which confine audio signals intended for reproduction by two or more than two loudspeakers as a mono signal plus a few parameters. Specific areas of application are telecommunications (hands-free devices), global networks, computer systems, broadcasting and transmission devices, particularly satellite transmission devices, professional audio technology, television, film and broadcasting and also electronic consumer goods.

Abstract: The proposed apparatus or the proposed method permits the linear variation of the degree of correlation particularly of pseudo-stereophonic audio signals, and overall provides a comprehensive, albeit extremely simple, postprocessing option. This is desirable in telephony, for example, which, even today, is still almost fundamentally based on a mono signal, in the area of professional postprocessing of audio signals, particularly for narrowing or expanding the mapping width thereof, for obtaining stable FM stereo signals, or else in the area of high quality electronic consumer goods, the aim of which is extremely simple but efficient handling.

Abstract: An angle-dependent operating device and method for obtaining a pseudo-stereophonic audio signals, such as through the parameterization of a fictitious opening angle ?+?, where ? is the fictitious left-hand opening angle (situated to the left of the principal axis of the monophonic audio signal to be stereophonized), and ? is the fictitious right-hand opening angle (situated to the right of the principal axis of the monophonic audio signal to be stereophonized), where it may be that ???. This is provided for the situation of fictitious opening angles ?+? which are asymmetric with respect to the principal axis of the monophonic audio signal to be stereophonized.