Our apps
Sound Spectrum Pro for Windows
Signal generators
Signal generators
- Produce certain sound patterns on the default audio output of the device.
- Start and stop a signal generator by pressing the BEEP button.
- Some sounds (tone, pink octave, pink 1/3 octave) can have different frequencies.
These are enabled and controlled by the position of the cursors:
- Place a cursor by clicking/tapping on the graph.
- Select/deselect a cursor by clicking/tapping on it. The cursors have an automatic deselect timeout (see Settings). When it is selected (white), you can:
- Drag it with left button/one finger (you don't need to have the mouse/finger on the cursor)
- Delete it by clicking/tapping on the X mark at the top.
- Delete both from the View menu or with C key.
- If you have two cursors, only the left one generates signals.
- In RTA mode, the frequency will be the band center.
- Other sounds (sweep, noise) have full spectrum and don't need frequency control.
- The volume is controlled by the slider on the top, and also by the general music volume controls of the device.
- Except "Tone", all signals can be used in synchronous measurement mode.
- When loopback is enabled, the output of the signal generator is routed to the audio input.
This is a perfect way to try out the signals and see also the effects of different FFT settings.
- Muted loopback - Only the loopback is active, no sound goes to the speakers.
- Sound loopback - The output of the signal generator goes both to the loopback and to the speakers.
If the output sample rate of the device does not match the input sample rate, the app will try to adjust them to fit.
Frequency controlled signals
- Tone - Generates a sine wave (single frequency).
- Pink octave - Generates a slice (one octave wide) of a full spectrum pink noise.
The sound energy per octave stays constant when you change the frequency (equal bars in RTA).
- Pink 1/3 octave - same as previous, generates an 1/3 octave wide slice of a full spectrum pink noise.
Full spectrum signals
- White noise - Generates random white noise (constant amplitude of all frequencies, constant energy per Hz).
It looks flat in FFT mode and increases with 10dB per decade (3dB per octave) in RTA mode.
- White sweep - Generates a frequency sweep from 10Hz to 20kHz, with constant energy per Hz.
Aka linear sweep.
- Pink noise - Generates random pink noise (constant energy per octave).
It looks flat in RTA mode and decreases with 10dB per decade (3dB per octave) in FFT mode.
- Pink sweep - Generates a frequency sweep from 10Hz to 20kHz, with constant energy per octave.
Aka exponential sweep or logarithmic sweep.
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