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2
Sound Engineering Solutions
4.
Demonstration mode.
The NEDSP1061 module features 2 preset demonstration modes. These demonstrate
the noise cancellation abilities of the NEDSP1061 module.
Demonstration 1:
Hold down the button and switch on the FT-817. After a short time the unit will emit a 2
tone beep. Release the button. The unit is now in demonstration mode 1.
The module will switch the noise cancellation on for 1.5 seconds, then off for 1.5 seconds.
It will then move onto the next level and repeat this continuously through all 4 levels.
This mode is particularly effective when the FT-817 is just receiving static, as it demonstrates
the attenuation of white noise at all the levels.
Alternatively tune the FT-817 into a good quality FM speech broadcast. This demonstration
shows how little the DSP alters the speech, at any of the levels.
Demonstration 2:
Follow the procedure as above. Wait for the second 2 tone beep, then release the key.
In this mode the filter level is set to level 3.
The noise cancellation is switched on for 3 seconds, then off for 3 seconds. This loops
until the user aborts this mode.
This is a good demonstration for listening noisy SSB conversations showing the before
and after.
Exiting the demonstration mode.
Hold down the button until the 2 tone beep is heard. Release the button.
After a short delay the LED will flash indicating the stored level, as during the normal
switch on.
5.
Notes about the noise reduction.
When using the module on level 4 the speech may sound slightly distorted when high
levels of noise are present.
6.
Specifications.
