Generator type and source

No. 3 lets you select what type of generator signal to be used, as well as the output source channel(s).

You can choose from the signal types shown below.

To get the best measurement results, select one of the two first choices, Single sweep or Multiple sweeps. If you want to monitor a sound system during a concert, select External source. If you want to measure speech parameters (and want to consider harmonic distortion), select MLS.

The rightmost list box lets you select where the measurement signal is to be played, as shown below.

If you want to perform remote measurement, select External. To use this you must have previously recorded the stimulus generated by WinMLS to a DAT-player (or another source). You may also export the stimulus to a .wav-file from Measurement->Export Stimulus....

If Left channel is selected, the stimulus is played back through the left channel, which means that the output source must be connected to the left channel output of the soundcard.

If Right channel is selected, the stimulus is played back through the right channel, which means that the output source must be connected to the output channel output of the soundcard.

If Left & right ch. is selected, the stimulus is played through both left and right channels. Note: If you are measuring a stereo sound system, it is not recommended to measure both loudspeakers simultaneously.

If L&R InvPolarity is selected, the stimulus is played in both left and right channel, but the right channel has opposite polarity, e.g. 180 degrees out of phase. Example: If this option is selected the sound will be directed to the surround speakers when measuring a Dolby Surround Sound System.

If Alternate L&R is selected, the first measurement is performed using right channel output, the second with the right channel output, the third with the left channel output, and so on. This may be useful when measuring a stereo sound system, since the loudspeakers should not be measured simultaneously.