what is dual mono
Perform the following steps for all supported audio encoding formats:
1. Play the ChID_voices_dualmono_ test signal. The product indicates decoding of a dual-mono signal.
2. Use the user-interface dual-mono control to select channel 1 while playing the ChID_voices_dualmono_ test signal.
The product plays the content of channel 1 (a male voice) on the L and R speakers. The content of channel 2 (music) is not played.
3. Use the user-interface dual-mono control to select channel 2 while playing the ChID_voices_dualmono_ test signal.
The product plays the content of channel 2 (music) on both speakers. The content of channel 1(a male voice) is not played.
4. Record the results on the Test Results form.
from Dolby® MS10 Multistream Decoder System Test Procedure/3.5 Dual Mono