Signal generator
  


If you need to generate artificial signal by using some standard mathematical function, use Signal tools/Signal generator option from the menu or graphic toolbar button. You can choose the type of the function (sine, step, white noise, ), signal length, frequency, sample rate, min & max values... SIGVIEW will allow only input of values which make sense for the chosen signal type (for example there is no frequency for a white noise signal) and disable all other fields.

After you set all signal parameters, click OK and a window with defined signal will be created. You can work with this signal as with any other signal or you can save it in a file for later use. If you would like to use this signal for sound output, simply choose Play&navigate /Play signal (with sound) option from the main menu. Choose Repeat forever menu option if you would like to play the signal continuously.

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Following signal types are supported by the signal generator:

·     Sine, Cosine: "pure frequency" signals generated by using corresponding mathematical functions

·     Step: Also known as "square wave". Changes its amplitude from minimal to maximal value according to frequency setting.

·     White noise: Random signal with a flat distribution of random values

·     Pink noise: Also known as 1/f noise. Random signal where each octave carriers an equal amount of noise power, i.e. signal power falls as frequency raises.

·     Sawtooth: This signal  ramps linearly from minimal to maximal value and then sharply drops to the minimal value again. Its waveform resembles the teeth on the blade of a saw.

·     Triangular: Similar as sawtooth signals but also falls linearly from maximal to minimal value. Each period forms a triangle form.

·     Constant: All signal vales are the same

·     Gaussian noise: Statistical noise that has a probability density function of the normal distribution (also known as Gaussian distribution). In other words, the values that the noise can take on are Gaussian-distributed.

·     Exponential noise: Statistical noise that has a probability density function of the exponential distribution. In other words, the values that the noise can take on are Exponential-distributed.

·     Sweep signal: It is a periodic (sine-like) signal which changes (sweeps) its frequency from defined start to end frequency during signal duration There are two types of sweep signals: linear sweeps  through frequency range at linear speed and exponential speeds up exponentially during sweeping so that lower frequencies has longer duration than higher frequencies.
  
Signal generator