Abstract: In an equalizer system with a plurality of equalizers, the variation and setting of various equalizer parameters (gains, center frequencies, Q factors) may be automated by an adjustment circuit that may utilize a procedure, for example, a nonlinear curve fitting. Upon each variation, a figure of merit (e.g., cost function) may be formed and the parameter variation may continue in the direction in which the cost function decreases until it reaches a predetermined level. After each new setting of the equalizers, the procedure can be performed and the desired parameter set can be passed on to an equalizer implementing routine. External control signals may be provided to the adjustment circuit which then generates corresponding internal control signals for setting the gains of the equalizers at the respective center frequencies, the internal control signals being modified relative to the associated external control signals in such a way that the interferences occurring between the equalizers are at least reduced.

Abstract: A method for adjusting a loudness of an announcement sound signal relative to a loudness of an entertainment sound signal, the method including the steps of determining the loudness of the entertainment sound signal, and adjusting the loudness of the announcement sound signal relative to the entertainment sound signal by determining a self-adaptive gain offset of the announcement sound signal relative to the entertainment sound signal, the self-adaptive gain offset adapting to the auditory perception of a user to which the entertainment sound signal and the announcement sound signal are output.

Abstract: A tracking system may determine the orientation or position of a movable object. The tracking system includes a signal generator that generates a non-audible detection signal in an audible frequency range. A transmitting device transmits the detection signal to a detection device. The transmitting device or the detection device may be positioned on the movable object, and the other may be positioned at a remote location. A processor may determine an orientation or position of the moveable object based on the transmission time between the transmitting device and the detection device.

Abstract: An equalizer includes at least two first mutually interfering equalizer sections, and at least two second interference-correcting equalizer sections, arranged in series. Each of the second equalizer sections corresponds with one first equalizer section, such that although each corresponding equalizer has the same center frequency, the second equalizer sections have an equalization response opposite the interference effect, and the gain of the corresponding second equalizer at the respective common center frequency contains the negative gain of at least one first equalizer adjacent to the corresponding first equalizer at the center frequency of the corresponding first equalizer.

Abstract: A method for adjusting a loudness of an announcement sound signal relative to a loudness of an entertainment sound signal, the method including the steps of determining the loudness of the entertainment sound signal, and adjusting the loudness of the announcement sound signal relative to the entertainment sound signal by determining a self-adaptive gain offset of the announcement sound signal relative to the entertainment sound signal, the self-adaptive gain offset adapting to the auditory perception of a user to which the entertainment sound signal and the announcement sound signal are output.

Abstract: A sample rate converter for converting a digital input signal having a first sample rate into a digital output signal having a second sample rate, wherein the second sample rate is different from the first sample rate. The sample rate converter includes a digital interpolation filter receiving the input signal and comprising a digital zero-phase filter, and a digital polynom interpolator connected to the interpolation filter and providing the output signal.

Abstract: A tracking system may determine the orientation or position of a movable object. The tracking system includes a signal generator that generates a non-audible detection signal in an audible frequency range. A transmitting device transmits the detection signal to a detection device. The transmitting device or the detection device may be positioned on the movable object, and the other may be positioned at a remote location. A processor may determine an orientation or position of the moveable object based on the transmission time between the transmitting device and the detection device.

Abstract: A sample rate converter for converting a digital input signal having a first sample rate into a digital output signal having a second sample rate, wherein the second sample rate is different from the first sample rate. The sample rate converter includes a digital interpolation filter receiving the input signal and comprising a digital zero-phase filter, and a digital polynom interpolator connected to the interpolation filter and providing the output signal.

Abstract: An equalizer includes at least two first mutually interfering equalizer sections, and at least two second interference-correcting equalizer sections, arranged in series. Each of the second equalizer sections corresponds with one first equalizer section, such that although each corresponding equalizer section has the same center frequency, the second equalizer sections have an equalization response opposite the interference effect, and the gain of the corresponding second equalizer section at the respective common center frequency contains the negative gain of at least one first equalizer section adjacent to the corresponding first equalizer section at the center frequency of the corresponding first equalizer section.

Abstract: An equalizer includes at least two first mutually interfering equalizer sections, and at least two second interference-correcting equalizer sections, arranged in series. Each of the second equalizer sections corresponds with one first equalizer section, such that although each corresponding equalizer has the same center frequency, the second equalizer sections have an equalization response opposite the interference effect, and the gain of the corresponding second equalizer at the respective common center frequency contains the negative gain of at least one first equalizer adjacent to the corresponding first equalizer at the center frequency of the corresponding first equalizer.

Abstract: The method and the apparatus specify that the acoustic useful signal is generated from a electrical useful signal, that an electrical listening signal determined by the acoustic useful signal and by an acoustic noise signal at the listening location be recorded, and from this the useful signal component contained therein be extracted. Then the useful signal component contained in the listening signal is compared with the listening signal itself, and the electrical useful signal is adapted in dependence on this.