Specifications

Chapter 13: Signal Generator 71
chapter 13
Signal Generator
(TDM, RTAS, and AudioSuite)
The Signal Generator plug-in produces audio
test tones in a variety of frequencies, waveforms,
and amplitudes. It is particularly useful for gen-
erating reference signals with which to calibrate
Pro Tools|HD interfaces (such as the 192 I/O)
and other elements of your studio.
Signal Generator Controls
Frequency Sets the frequency of the signal in
hertz. Values range from a low of 20 Hz to a high
of 20 kHz in a 44.1 kHz session. The upper limit
of the frequency range for this setting will in-
crease to match the Nyquist frequency (half the
sample rate) in 96 kHz and 192 kHz sessions
(HD-series systems only).
Level Sets the amplitude of the signal in deci-
bels. Values range from a low of –95 dB to a high
of 0.0 dB.
Signal These buttons select the waveform.
Choices are sine, square, sawtooth, triangle,
white noise, and pink noise.
Peak Generates signal at the maximum possible
level without clipping.
RMS Generates signal at levels consistent with
the RMS (Root-Mean-Square) value, or the effec-
tive average level of the signal.
Signal Generator plug-in
Refer to the Pro Tools|HD Setup Guide for
instructions on using Signal Generator to
calibrate the 96 I/O, or 192 I/O audio inter-
faces, as well as older audio interfaces.
The TDM Signal Generator produces a tone
as soon as it is inserted on a track. To mute
the Signal Generator, use the Bypass button.
When using the RTAS version of Signal
Generator, start playback to generate.
The Signal Generator plug-in is not in-
tended for rigorous test purposes; it is a sim-
ple level calibration tool.