Digital-to-analog noise generator

A noise generator that is responsive to digital input control signals to provide an analog noise signal, said noise generator comprising:

• a noise source for generating a random noise signal;
• first means for storing a center frequency input signal;
• second means for storing a wobbulated waveform input signal;
• means for combining that is operative with said noise source and said first and second storing means to provide a digital noise signal in response to the random noise signal and the center frequency and wobbulated waveform input signals.

A noise generator that is responsive to noise quality input signals and noise modulation input signals to generate analog noise signals having a noise signal spectrum of controlled quality and character, said noise generator comprising:

• a noise source that provides a random noise output signal that determines the quality of the noise signal spectrum;
• first means for weighting the random noise signal, said means being operative with the noise source and responsive to a noise bandwidth input signal to weight the noise signal in response to the noise bandwidth signal to control the range of the noise signal spectrum;
• first means for storing a center frequency input signal that determines the center frequency of the noise signal spectrum;
• second means for storing a wobbulated waveform input signal that determines the modulation of the noise signal spectrum;
• second means for weighting the wobbulated waveform input signal, said means operative with the second storing means and responsive to a wobbulated bandwidth input signal to weight the wobbulated waveform input signal in response to the wobbulated bandwidth input signal to control the amplitude of the noise signal spectrum modulation;
• means for combining the weighted wobbulated waveform input signal, the center frequency input signal, and the weighted random noise signal, in response to the outputs of the first storing means and the first and second weighting means;
• and
• means for converting the output of said combining means to an analog signal in response to the digital output of said combining means.

A method for generating a noise signal in response to digital noise quality control signals and in response to first and second noise modulation control signals, said method comprising:

• controlling a random noise signal in response to the digital noise quality control signal;
• controlling the first digital modulation control signal in response to the second digital modulation control signal;
• adding the controlled random noise signal to the controlled first digital modulation signal to provide a digital noise signal;
• and
• converting the digital noise signal to an analog noise signal.

A method for controlling the spectrum of a noise signal generator in response to a random noise signal, a noise bandwidth signal, a center frequency signal, a wobbulated waveform signal, and a wobbulated bandwidth signal, said method comprising:

• multiplying the random noise signal by the noise bandwidth signal;
• multiplying the wobbulated waveform signal by the wobbulated bandwidth signal;
• adding the center frequency signal, the product of the random noise signal and the noise bandwidth signal, and the product of the wobbulated waveform signal and the wobbulated bandwidth signal to provide a digital noise signal having a controlled spectrum;
• and
• converting the controlled digital noise signal to a controlled analog noise signal.

A method for generating a controlled noise signal spectrum in response to digital control signals for controlling the quality, center frequency, bandwidth, and modulation of the noise signal spectrum, said method comprising:

• multiplying a random noise signal that controls the quality of the noise signal spectrum by a noise bandwidth signal that controls the bandwidth of the noise signal spectrum;
• multiplying a wobbulated waveform signal for controlling the modulation of the noise signal spectrum by a wobbulated bandwidth signal for controlling the amplitude of the modulation of the noise signal spectrum;
• adding a center frequency signal for controlling the center frequency of the noise signal spectrum, the product of the random noise signal and the noise bandwidth signal, and the product of the wobbulated waveform signal and the wobbulated bandwidth signal to provide a digital noise signal having a controlled spectrum;
• and
• converting the digital noise signal to an analog noise signal.