Pink Noise: Swept

1. Click the Processing tab to open the Processing Workspace.
2. In the palette area, click the DSP tab.
3. Expand the Misc: level, delay, meter... category of blocks.
4. Click and drag the Pink Noise: Swept block into your Processing Map.
5. Wire the output from the Pink Noise: Swept block to the appropriate block.
6. (Optional) Customize the names of the block and the output node by clicking their current name and then typing the custom name in the text box that appears. Click the X to save the name.

• Open the Swept Noise block's properties by double-clicking the block or hovering and clicking the properties icon that appears in the upper right of the block's title bar. From here, do the following:
  • Unmute the block and use the Manual Frequency and Amplitude settings to set the desired volume for room excitation.
  • Determine the frequency range over which you want to check for rattles and use the Start Frequency and Stop Frequency controls to limit the pink noise band-pass sweep. The sweep proceeds logarithmically from the Start Frequency to the Stop Frequency. It pauses for the specified Dwell Time at each of the Steps.
  • Use the Start button to start the sweep and listen for rattles. If you hear a rattle, click the Pause button and track down the source of the rattle. If you do not have time to listen everywhere in the room during a single sweep, check the Repeat checkbox so that the sweep restarts automatically when the Stop Frequency is reached. Stop the sweep at any time and return to the Manual Frequency by clicking the Stop button.

  • note: Pink noise sweeping stops when you disconnect from HAL. The block reverts to the Manual Frequency.

  • View the Sweep Progress bar which displays a visual representation of the Sweep settings.
  • View the Output meter which indicates the pink noise signal’s rms and peak amplitudes in dBFS and dBr.

note: The Pink Noise: Swept block is muted by default.

UI Element	Purpose
Output node	Connection point for wiring the pink noise output

 

(Hover over the thumbnail below to view the properties dialog box.)

UI Element	Purpose
Sweep Progress	A visual representation of the Sweep configuration. When connected, the current frequency is displayed in real time.
Manual Frequency	Manual control for setting the frequency of the pink noise. Use in combination with Amplitude to set the desired volume for room excitation. Range is 20 Hz to 20000 Hz. Default = 1000 Hz
Amplitude	Specifies the amplitude of the pink noise output. Use in combination with Manual Frequency to set the desired volume for room excitation. Range is -100 dBr to 0 dBr. Default = -20 dBr
Start Frequency	Specifies the starting frequency for the pink noise band-pass sweep. Range is 20 Hz to 19998 Hz. Default = 20 Hz
Stop Frequency	Specifies the stop frequency for the pink noise band-pass sweep. Range is 22 Hz to 20000 Hz. Default = 20000 Hz
Steps	Range is 1 to 255. Default = 100
Dwell Time	Specifies the time over which the pink noise sweep pauses between Steps. Range is 10 milliseconds to 2 seconds. Default = 20 milliseconds
Control Buttons	Use these buttons to Start, Stop, and Pause the sweep.
Repeat	When checked, causes the sweep to restart automatically when the Stop Frequency is reached. Default = Unchecked
Output (Meter)	Indicates the pink noise signal’s rms and peak amplitudes in dBFS and dBr
Mute	Mutes the block's output Default = Checked (muted)