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 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 present invention relates to devices and methods for producing stereophonic or pseudostereophonic signals. In particular, the interrelations between spatial and technical parameters are examined and new ways of optimizing said parameters are proposed. Furthermore, inverse problems are applied in an unexpected manner to optimization problems pertaining to the conversion. The invention is relevant particularly to the encoding of audio signals.

Abstract: Signals (for example audio signals) which seem to be completely random, yet for which universally valid statements should be made, for example in the form of parameterizations which, on average, are accurate and can be determined only on the basis of short signal sections. Instead of simulating for example a Gaussian process, projections of algebraic operations—on the plane of real or complex numbers—of said signal sections for example are observed and proven for said astonishingly simple algebraic invariants. Said invariants are subsequently used as tags in order to perform, for example, a selection according to their frequency. On average, the present system proves to be more efficient than known methods to date. The practical-commercial application of said system covers nearly the entire signal processing field. The present document addresses in particular the stochastic observation of audio signals, as known for example from the field of digital audio broadcasting.

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.