Abstract: A vehicle includes a music signal processing system having a loudspeaker disposed within a passenger compartment of the vehicle and emitting audible music into the passenger compartment. A microphone is disposed within the passenger compartment and converts the audible music and noise within the passenger compartment into an analog electrical microphone signal. An analog-to-digital converter is connected to an output of the microphone and receives the analog electrical microphone signal and converts the analog electrical microphone signal into a digital electrical microphone signal. A sample rate down converter is connected to an output of the analog-to-digital converter. A narrow band adaptive noise control is connected to an output of the sample rate down converter and receives an engine speed signal. A sample rate up converter is connected to an output of the narrow band adaptive noise control. An adder device adds an output of the sample rate up converter to a music signal.

Abstract: A method of operating an audio system in a vehicle includes providing m number of microphones disposed within a passenger compartment of the vehicle. The microphones produce a plurality of microphone signals. Within the passenger compartment of the vehicle, k number of loudspeakers are provided. A plurality of convergence factors ? for use in performing active noise control are estimated. The estimating includes calculating an Eigen value ?(?) of an autocorrelation matrix of a passenger compartment transfer function as ? k ? ( ? ) = A k ? ( ? ) 2 2 , wherein Ak(?) is the frequency response of the passenger compartment transfer function. A frequency ?min of a local minimum of ?(?) is determined. A largest stable value for ?Max(?min) is found by experimentation, wherein a rotational speed of an engine of the vehicle, expressed in revolutions per minute, frpm=2??min. A calibration factor is calculated as L=?(?min)?Max(?min).

Abstract: A method of operating an audio system in a vehicle includes providing m number of microphones disposed within a passenger compartment of the vehicle. The microphones produce a plurality of microphone signals. Within the passenger compartment of the vehicle, k number of loudspeakers are provided. A plurality of convergence factors ? for use in performing active noise control are estimated. The estimating includes calculating an Eigen value ?(?) of an autocorrelation matrix of a passenger compartment transfer function as ? k ? ( ? ) = A k ? ( ? ) 2 2 , wherein Ak(?) is the frequency response of the passenger compartment transfer function. A frequency ?min of a local minimum of ?(?) is determined. A largest stable value for ?Max(?min) is found by experimentation, wherein a rotational speed of an engine of the vehicle, expressed in revolutions per minute, frpm=2??min. A calibration factor is calculated as L=?(?min)?Max(?min).

Abstract: A vehicle includes a music signal processing system having a loudspeaker disposed within a passenger compartment of the vehicle and emitting audible music into the passenger compartment. A microphone is disposed within the passenger compartment and converts the audible music and noise within the passenger compartment into an analog electrical microphone signal. An analog-to-digital converter is connected to an output of the microphone and receives the analog electrical microphone signal and converts the analog electrical microphone signal into a digital electrical microphone signal. A sample rate down converter is connected to an output of the analog-to-digital converter. A narrow band adaptive noise control is connected to an output of the sample rate down converter and receives an engine speed signal. A sample rate up converter is connected to an output of the narrow band adaptive noise control. An adder device adds an output of the sample rate up converter to a music signal.

Abstract: A method and apparatus for correcting a phase of a phase-modulated signal for blind demodulation. The method and apparatus generally include the creation of a plurality of angle bins, wherein each constellation point of the phase-modulated signal is assigned to an angle bin, depending on its phase angle. A histogram is formed of the angle bins and cross correlated with a template signal model histogram. The maximum value of the cross correlation determines a correction angle by which the phase angle of all the phase-modulated constellation points is multiplied.

Abstract: A system and method for symbol rate estimation using vector velocity that does not require any prior knowledge of the signal's structure and is accurate in the presence of frequency offset and noise. An input signal is converted to a symbol constellation path signal, and a velocity signal representing a velocity of the symbol constellation path signal is generated. A first frequency spectrum of the velocity signal is generated by performing a Fast Fourier transform on the velocity signal, and a maximum peak value of the first frequency spectrum, a first bin below the maximum peak value, and a second bin above the maximum peak value are identified.