SIGEN – SIGNAL GENERATOR

SiGen Signalgenerator

SiGen is a Signal Generator that can be used in conjunction with a real-time Analyzer, like the MusicScope, to do room acoustic and loudspeaker measurements.

OVERVIEW

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Compatibility:

  • Windows 7 – 10 / 32 & 64 Bit
  • Mac OSX Lion 10.7.3 – Sierra 10.12.x
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Signal Generator to measure the transfer function’s amplitude of listening rooms and loudspeakers.

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Signal Sources:

  • Weißes Rauschen
  • Linear and logarithmic Sinus-Sweep
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Free of charge!

Apple MacOS X Image - v1.0

(minimum 10.7.3 – Lion)
» Release notes

Download

Microsoft Windows 32/64bit - v1.0

(minimum Windows 7 – 32bit)
» Release notes

Download

WHY DO I NEED A SIGNAL GENERATOR?

SiGen is a signal generator to create specific measurement signals that can be used by a real-time analyzer (RTA) to investigate room acoustics and the amplitude response of loudspeakers.

The signals generated are white noise and sinus sweeps either linear or logarithmic.

To make use of SiGen you need a Real-Time Analyzer like the MusicScope. The MusicScope is able to receive audio data from the internal laptop or an external measurement microphone to analyze the spectrum of the audio signal in real-time. Together with SiGen, the MusicScope becomes a capable RTA to do room and loudspeaker measurements.

In contrast to standard RTAs with their low frequency resolution, the combination of SiGen and the MusicScope excels in having a resolution of at least 1024 bins over the whole frequency range.

HOW DO I USE SIGEN TOGETHER WITH THE MUSICSCOPE OR ANY OTHER RTA?

The setup of SiGen is extremely easy:

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Select the Signal Source:

White Noise:
This is a broadband signal containing all frequencies up to halve of the sampling rate.

Sinus Sweep Linear:
This sweep increases the signal frequency in a linear manner with a measurement time of 30 seconds. The sweep provides a high spectral resolution for higher frequencies.

Sinus Sweep Logarithmic:
This is an exponential sweep to have a higher resolution of lower frequency amplitude measurements.

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Choose the audio output device for test signal playback.

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Select the Sample Rate.

SiGen supports several sample rates (44.1, 48, 88.2 and 96 kHz) to create test signals with frequencies of up to 48 kHz.

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Press start to initiate the test signal and set the volume of your audio output device or the connected amplifier accordingly.

Die passende Lautstärke sollte entweder am Audioausgangsgerät oder dem angeschlossenen Verstärker eingestellt werden.

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Start the MusicScope and activate its real-time analyzing mode.

It is important to deactivate the MusicScope’s audio output to avoid any audio feedback loop.

Preconditions for a flawless measurement:

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Make sure that the background noise level is as low as possible.

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Adjust the volume of your sound card or amplifier to assure that the resulting measurement curve is meaningful. A 30 dB difference between the highest and lowest amplitude is already quite good to get a valid measurement.

SiGen Signalgenerator

Screenshot of SiGen configured for White Noise over
“Built-In Output” with a sampling rate of 96 kHz.

The following screenshots show measurement results done by the MusicScope in RTA-Mode.

Screenshot of the MusicScope (Spectrum & Spectrogram) with SiGen in white noise mode to measure the room and loudspeaker amplitude over frequency.

Screenshot of the MusicScope (Spectrum & Spectrogram) where SiGen was in Linear Sinus Sweep mode to provide good resolution for the upper frequencies.

For this MusicScope Screenshot (Spectrum & Spectrogram) SiGen generated a Logarithmic Sinus Sweep to provide a better resolution for the lower frequencies. Well, we can even observe a 50 Hz distortion caused by power line interferences.

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