The Swept Pink Noise Block generates a pink noise signal and passes it through a 1/3-octave band-pass filter to limit the spectrum of the output. Before starting a sweep, the center frequency of the band-pass filter tracks the Manual Frequency. The center frequency also returns to the Manual Frequency setting once a sweep stops. The frequency sweep settings determine the range and resolution of the sweep, and how much time the center frequency remains at each frequency setting during the sweep. The output is adjustable to control the volume of the pink noise signal.
Use the Swept Pink Noise block to excite a room at different frequencies to detect rattles in ceilings, walls, appliances, and ductwork. This block is also useful for quickly testing the output of each driver in a multi-way loudspeaker.
note: Pink noise sweeping stops when you disconnect from HAL. The block reverts to the Manual Frequency.
note: The Pink Noise: Swept block is muted by default.
|Output node||Connection point for wiring the pink noise output|
(Hover over the thumbnail below to view the properties dialog box.)
A visual representation of the Sweep configuration. When connected, the current frequency is displayed in real time.
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
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
Specifies the starting frequency for the pink noise band-pass sweep. Range is 20 Hz to 19998 Hz.
Default = 20 Hz
Specifies the stop frequency for the pink noise band-pass sweep. Range is 22 Hz to 20000 Hz.
Default = 20000 Hz
Range is 1 to 255.
Default = 100
Specifies the time over which the pink noise sweep pauses between Steps. Range is 10 milliseconds to 2 seconds.
Default = 20 milliseconds
Use these buttons to Start, Stop, and Pause the sweep.
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|
Mutes the block's output
Default = Checked (muted)