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Noise

  1. Graphics
  2. List
  3. Properties

This generator produces various types of noise, which can be modulated.

This can be used, for example, to simulate ocean waves by using a separate, much slower (around 0.2 Hz) waveform instead of the master brainwave. If you simultaneously set a phase for the left, centre and right volume channels, you can create the sound of a wave rolling in and passing by.

The filters can also be used to create effects such as a powerful, rolling wave at the start, which then transitions into a gentle, lapping beach wave towards the end.

It is also possible to simulate breathing sounds, so that you can trigger the breathing as well. To do this, you use very low frequencies of around 0.12 Hz, which corresponds to 7 breaths per minute.

 Graphics

The time curves of the various changing properties of the noise generator

Various curves can be defined for:

Volume

This describes the profile of the volume during a session.

Wave frequency

The profile of the frequency at which various effects are to be modulated.

Volume Left

This can be used in conjunction with a phase. If, for example, it is set so that first the left, then the centre and finally the right volume swells and fades, this value represents the amplitude of the wave starting on the left.

Centre Volume

The volume of a passing wave in the centre.

Volume Right

The volume of a passing wave on the right.

Filter Frequency

This is the reference frequency around which a filter operates. If, for example, you select a low-pass filter and set a value of 400 Hz here, all frequencies of the noise above this point are attenuated and the noise appears more muted.

Filter Sharpness

This setting controls how sharp the transition of a filter is; the higher the value, the more abrupt the transition. A value of 0 effectively disables the filter, as the transition is then extremely broad . A value of 10 results in a fairly sharp transition.

 List

The time series of the various changing properties of the noise generator, presented as a list

List mode is more suitable for precise values.

 Properties

The specific settings of the noise generator

Name

A name for the generator. The default is ‘noise’.

Balance

Stereo balance.

Master

Switch between controlling the brainwave frequency via the Master or via a custom profile specific to this generator.

Noise type

Various types of background noise
  • whiteBright noise, as all frequencies have the same amplitude. High frequencies at the same amplitude have more energy, so they are perceived as louder.
  • pinkNatural noise, in which the frequencies decrease towards the higher end in such a way that our ears perceive them as having the same intensity.
  • brownMuffled noise, where the frequencies decrease even more sharply as they rise.

Filter

There are numerous types of filter available:
  • The filter is switched off.
  • The low frequencies pass through, whilst the high frequencies are attenuated.
  • The treble frequencies pass through, whilst the bass frequencies are attenuated.
  • The mid-range frequencies pass through, whilst the bass and treble are attenuated.
  • The bass frequencies are boosted.
  • The high frequencies are boosted.
  • The mid-range frequencies are boosted.
  • The mid-range frequencies are attenuated.

Phase

The phase control allows you to set the delay with which the modulation frequency affects the volume on the left and right channels.

If set to the first quarter, the left side is affected first, followed by the centre after a quarter of the modulation frequency, and then the right side at the halfway point. This creates a swelling progression from left to right, which then ebbs away until it starts again from the beginning.

Set to the first quarter, the movement runs in the opposite direction.

Set to the far left, the centre and the far right, the effect is cancelled out and you only hear the swell and fade from the beginning.