Test Signals and Files

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Test Signals and Files
Index
OmniMic test signal files can be downloaded from the Dayton Audio site for playback from external players.

You can also save OmniMic internally generated test signals to files yourself from the OmniMic software using the "Save Stimulus as WAV" submenu under the "Files" menu. Note that the files generated will NOT be affected by the Run/Pause button.

You can also drive the amplifier/speaker system from the computer soundcard using the Config menus. If you have more than one soundcard or DAC device, you can also select it from the same menus. When running from the soundcard, audio output will stop when OmniMic is paused or when you are saving a data file, and will mute if you hit the Esc key (F12 will turn it back on). When playing a signal for the 96kbps OmniMic40k, make sure that the soundcard is configured in the Windows settings to play at least at a 96kbps sample rate! This setting can be found through the Windows' Sound Controls use the "sound card settings" menu item under OmniMic's "Config" menu and follow the directions.

In most measurements, tracks in WAV, FLAC or MP3 format can be used for playback from computer systems or MP3 players. If using MP3, use one of the higher quality type MP3 compression formats (128k or better) for best results. Some ripping programs may do better than others in providing usable MP3 test tracks. For Frequency Response measurement using MP3, avoid using the Pseudo Noise stimulus signal.

Please note that an MP3 file or a normal CD player playing a Redbook CD (such as the original OmniMic test signal CD or DVD) does not have sufficient bandwidth for use with OmniMic40k microphones beyond 20kHz. Use a FLAC or WAV file as described above to play the proper 96k type signal through a capable audio player device. You can use the Omnimic CD or DVD with OmniMic40k, but usable results will result only up to 20kHz. Note that most TOSLINK optical interfaces also support only up to 22kHz output.