VS1103b Feedback Eliminator Demonstration Board
Posted: Tue 2020-02-25 16:33
Hi,
I have a VS1103b Feedback Eliminator Demonstration Board. I've programmed it with VLSI firmware 'fbe_v110'. I'm using its on-board microphone. I've wired the headphone to an external active speaker via a 470R/3n3 filter and a 10u/10K DC decoupler (as described in you documentation).
The unit seems to be working, I speak into the microphone and can hear my voice coming out of the speaker. However, I'm yet to be convinced that the unit is helping with acoustic feedback. I fully understand that this unit can't eliminate feedback in all circumstances.
The manual says that holding down SW2 will bypass the FBE algorithm. My tests indicate that feedback is actually worse when the FBE algorithm is active (SW2 not held down). So I'm puzzled.
So some questions:
Why does feeback appear to be worse when FBE algorithm is active (SW2 not down)?
Do switches SW1 and SW3 do anything?
I assume that the left/right output channels are outputting an identical signal (given that the input is monophonic) is that correct?
Am I using the latest version of the firmware (fbe_v110)?
Do I have the latest version of the VS1103b Feedback Eliminator manual (Rev. 1.10)?
Is the source code for the firmware available for download? If so, where do I download it from?
Thanks, Chris.
I have a VS1103b Feedback Eliminator Demonstration Board. I've programmed it with VLSI firmware 'fbe_v110'. I'm using its on-board microphone. I've wired the headphone to an external active speaker via a 470R/3n3 filter and a 10u/10K DC decoupler (as described in you documentation).
The unit seems to be working, I speak into the microphone and can hear my voice coming out of the speaker. However, I'm yet to be convinced that the unit is helping with acoustic feedback. I fully understand that this unit can't eliminate feedback in all circumstances.
The manual says that holding down SW2 will bypass the FBE algorithm. My tests indicate that feedback is actually worse when the FBE algorithm is active (SW2 not held down). So I'm puzzled.
So some questions:
Why does feeback appear to be worse when FBE algorithm is active (SW2 not down)?
Do switches SW1 and SW3 do anything?
I assume that the left/right output channels are outputting an identical signal (given that the input is monophonic) is that correct?
Am I using the latest version of the firmware (fbe_v110)?
Do I have the latest version of the VS1103b Feedback Eliminator manual (Rev. 1.10)?
Is the source code for the firmware available for download? If so, where do I download it from?
Thanks, Chris.